Cisco ios software release 15 0 features sets

cisco ios software release 15 0 features sets

Cisco IOS software is packaged in feature sets that consist of software images that support specific platforms. The feature sets available for a specific. The Cisco IOS Software Release (1)M has been retired and is no longer supported. The Release Notes document includes sections that list new software and hardware features in the release. Most features listed in Release Notes will have a URL. MANAGEENGINE EVENTLOG ANALYZER ADMIN GUIDE Сообщаю Для вас, что.

Use the arp packet-priority enable command when a network congestion causes ARP packets to drop. The output of show ip bgp all summary shows the address family in NoNeg or idle state, and it will never leave that state. Typical output looks like:.

The timing of OPEN messages is not changed. Successful negotiation of the AFI results in a reset of the backoff sequence for future attempts. The new connection is closed. If the old session was stale, the keepalive causes it to be closed. Old Behavior: If no queue-limit is configured, the queue-limit for the current class is based on the parent values for available buffers and current class allocated bandwidth.

New Behavior: The queue-limit is always calculated from the parent queue-limit and allocated bandwidth in the current class. When you use the queue-limit command to explicitly configure the values, these values are used as the definition of the queue-limit.

For random detect behavior, thresholds are calculated from the available aggregate queue-limit for that class. New Behavior: A new keyword, cache , is added to the mls netflow command. When the mls netflow cache command is executed, the command returns a cached value of the total active flow count. The cached value is updated every 30 seconds. Old Behavior: ISG reverses the inbound and outbound data values in the ssg-control-info attribute.

Cisco IOS software images are subject to deferral. Cisco recommends that you view the deferral notices at the following location to determine if your software release is affected:. For general information about the types of documents listed in this section, see the following document:. Caveats describe unexpected behavior in Cisco IOS software releases.

Severity 1 caveats are the most serious caveats; severity 2 caveats are less serious. Severity 3 caveats are moderate caveats, and only select severity 3 caveats are included in this section. In this section, the following information is provided for each caveat:. Note If you have an account on Cisco. To reach the Bug Toolkit, log in to Cisco.

If the defect that you have requested cannot be displayed, this may be due to one or more of the following reasons: the defect number does not exist, the defect does not have a customer-visible description yet, or the defect has been marked Cisco Confidential. This section consists of the following subsections:. Conditions: This symptom is seen with the FRR feature configured and possibly under scale conditions. Conditions: This symptom is observed on a Cisco ASR router and kingpin router chassis under the following conditions:.

Range configuration with more than virtual channels VC. Back to back creation and deletion of multiple VCs with no time gap. Workaround: There is no workaround. However, other routing protocols may flap. Symptoms: The router crashes when a situation is created with bandwidth 0 on an EVC and then the queue limit is modified. Conditions: This symptom occurs when bandwidth 0 is created on an EVC and then the queue limit is modified. When the interface of the next hop goes down, the next hop will be resolved via the default route and the route will still be seen as active in the routing table.

This is not the case with IPv4. With IPv4, the static route would be removed from the routing table. Workaround: Use a fully specified static route where the interface and the next hop address are configured. Symptoms: Continuous diag failure and CRC errors are seen. Conditions: This symptom is observed upon entering the no mls switching command, followed by the mls switching command, bus stall is called.

Re-sync is done twice in the fix, since with one resync we are still facing diag failures on this card. Symptoms: Router crash after deleting multiple VRFs. This happens very rarely. Conditions: The symptom is observed in a large scale scenario.

Conditions: This symptom occurs when running multiple OSPF processes with filtered mutual redistribution between the processes. Symptoms: After a switchover, a Cisco Catalyst series switch may be replicating some spanned traffic indefinitely and flooding the network with the span copies. Conditions: The issue is seen after the following sequence:. Workaround: Remove and re-add the neighbor default- originate command on the Cisco router and do a soft clear for the VRF neighbor.

Symptoms: Netflow counter gets incremented when sending SSM group range as v2. Conditions: The symptom is observed when doing an SSO. Conditions: The symptom is observed once the IPsec session is up and traffic is flowing through.

If the tunnel source or destination is changed, the router crashes. This does not occur with a plain GRE tunnel. Symptoms: You can observe decrementing free memory by each repetition of the process by using the show memory statistics command under the active SP. The memory leak is recognized on the active SP. Conditions: A chunk memory leak is seen after configuring the IP source guard.

For example:. X hold. X IPv4 Unicast. Exception to IOS Thread:. The scheduler process will attempt to reference a freed data structure, causing the system to crash. Conditions: This symptom is observed when the Cisco ASR router experiences recent dynamic neighbor removals, either because of flapping or potentially by manual removal.

This issue only happens when BGP dynamic neighbor is configured. Symptoms: Small buffer leak. Workaround: Ensure all your PPP connections stay stable. There are two triggers:. When one generic stream is deleted, an internal counter is decremented twice. Thus disabling the LI feature even when there is another active tap installed. If the port ACL is on a supervisor port then the router goes for a reload.

This issue will effect only if there is a switchport configured on the router. The issue will not affect the traffic or the filtering based on the ACL, even if the testAclDeny fails and the card is on MajFail due to this test only. As a workaround, we can remove the switchport configs for the ports if they exist , then give a reload and apply the configs after the router has come up.

In case the router reloads, the ports will not go into shutdown state. Hence, it is a cosmetic issue. It can be ignored. If reloaded in presence of the switchport configs, it should come up after two reloads into minor error state. Symptoms: The source or destination group-address gets replaced by another valid group-address. Conditions: The symptom is observed during the NVGEN process if it suspends for example: when having a huge configuration generating the running-config for local viewing or during the saving of the configuration or during the bulk sync with the standby and the NVGEN process suspends.

The global shared buffer having the address gets overwritten by another process before the NVGEN completes. Symptoms: A Cisco router may crash when an IPv4 default route update occurs or when doing the show ip route command. Conditions: This symptom occurs under the following conditions:. At least one IPv4 route associated with each of the 23 possible supernet mask lengths exist. All routes corresponding to one of the 23 possible supernet mask lengths are removed.

The router may now crash when doing show ip route command or when default route is updated. Insure that not all 23 supernet mask lengths are populated by doing route filtering. If workaround 1 is not possible, then insure that at least one supernet route for all possible mask lengths exists at all times, for example by configuring summary routes that do not interfere with normal operation. Workaround: Remove the cluster-id configuration or hard-reset the bgp session on the affected Cisco router.

However, removing the cluster-id does not guarantee protection. Workaround 1: In some cases, clearing the router may trigger proper reprogramming of the prefix in the hardware. Workaround 2: Remove load-sharing from the TE tunnels. Decapsulation path shows wrong rewrite index for flapping peers, instead of expected 7FFA recirculation index. ES20 card as core-facing. Workaround: Identifying the adjacency of the flapping peer and changing the rewrite index to 7FFA manually stops the flap:.

Symptoms: A router crashes when the following command is executed:. No crashinfo is generated on the RP and SP. Please see the attached console before the crash. Conditions: This symptom is seen with redundancy switchover of RSPs.

Conditions: This symptom is observed in switch traffic and flood traffic line rate and less that byte packet size with more than one port in the egress path flood. Symptoms: When an IPHC configuration is applied on a multilink bundle interface and the interface is flapped, the IPHC configuration does not apply successfully on a line card. Conditions: The symptom is observed with a multilink interface flap. Symptoms: Intercepted packets are not forwarded to MD.

Symptoms: Symptoms vary from one image to another. The following symptoms have been mostly observed:. Shutdown the SPAN session if not in use. There is no workaround to avoid spurious memory access messages. PIM neighbor is not established over routed pseudowire. Conditions: These symptoms are seen under the following conditions:. Over physical interface only i. Conditions: Layer 2 distributed Etherchannel traffic is learned on a hashed interface first and then moved to a non-hashed interface.

Workaround: Do not use Layer 2 distributed Etherchannel. Symptoms: CPU hog messages are seen on the console. Conditions: This symptom is seen when applying huge rmap with more than 6k sequences on an interface. Symptoms: SIP crash may be observed due to illegal memory access. Conditions: This symptom is seen when enabling FRR on the head end with auto- backup already configured on the box.

Workaround: Remove auto-backup configuration from the midpoint router. Conditions: This issue is seen only with the older SPA hardware hardware version lower than 2. Workaround: Use the latest SPA hardware hardware version 2. Finally memory allocation failures are observed.

Use the show memory proc stat history command to display the history of free process memory. This is similar to CSCti Workaround: Do not issue the show hw-module slot X tech-support or the show platform hardware version command on an ES line card unless explicitly mentioned by Cisco. Conditions: This symptom occurs with state change of one of the uplink L3 interfaces. Conditions: This symptom is seen when service policies less than kb are added or removed.

Symptoms: A crashdump may occur during a two-call-per-second load test on a gateway, and the gateway may reload. The crash occurs after approximately , calls. Symptoms: A router may crash under a certain specific set of events.

Conditions: The crash may happen under a combination of unlikely events when an IPv6 PIM neighbor that is an assert winner expires. Workaround: There is no obvious workaround, but the problem is unlikely to occur. There are some count values that are increasing on serial interface of brand router, but there was no output from the debug ip packet command on brand router. Conditions: Max-header size different on both ends, PPP not negotiating lower size.

Symptoms: The SPI value is shown as 0x0, hence the ipsec sa validation is failing. Conditions: This symptom is observed when the crypto profiles are being applied. The symptom is not observed with simple crypto maps. Workaround: This is not a forwarding issue. Some of the bundles that are active on active RP, show up as inactive on standby RP. This may result in the bundles going to down state after switchover. Conditions: This symptom is observed when the automated test script is run on three connected routers.

Do not run the automated script. Further Problem Description: Other problems observed are as follows:. Reload the LC to resolve the issue. Conditions: The symptom is observed when a dialer interface has moved out from standby mode. Symptoms: The Cisco series router crashes in a very rare case. Symptoms: With multiple next-hops configured in the set ip next-hop clause of route-map, when the attached interface of the first next-hop is down, packets are not switched by Policy Based Routing PBR using the second next-hop.

Conditions: This symptom is seen only for packets switched in software and not in platforms where packets are policy based routed in hardware. This symptom is observed with route-map configuration, as given below: route-map RM name match ip address acl set ip next-hop NH1 NH2. Conditions: This happens when the ip cef accounting non-recursive command is configured on the router.

This command is documented as an unsupported command on the Cisco platform, but it should also generate an error message when configured on the Cisco series router. Preferably it should not take any action. For example, it should not affect any other working features. Workaround: Unconfigure the command by typing the no ip cef accounting non- recursive command.

Conditions: The symptom is observed with the following conditions:. Symptoms: When applying the following netflow configuration in the same sequence, the standby supervisor module continuously reloads:. The router must have a redundant RP. The monitor must be using a flow record that does not conform to V5 export format while being used with V5 exporter and be running on a distributed platform.

When the flow monitor is applied to an interface the config sync will fail and the standby will reload. Workaround 1: Remove the flow monitor configuration. Workaround 3: Use a record format exportable by netflow-v5. Conditions: This symptom is observed with the following CLI:. During the FTP operation, if the interface fails or shuts down, it could trigger this crash. Workaround: This is an FTP-specific issue. Redirect the output by TFTP or other protocols.

The PoAs are in a split brain situation and both PoAs attempt to become active. After the fix the PoA with the backbone interface failure will unbundle its port-channel memberlinks, leaving only one PoA as active. There is no impact to other releases. Conditions: This symptom is observed when the network experiences delay, and reordered and duplicate packets can trigger this problem when IPSLA udp-jitter is scheduled.

Symptoms: The following error messages may be displayed in the log on the Cisco Catalyst series switches:. Conditions: This symptom occurs after the TE tunnels are recovered and resignaled and the RESV does not arrive after the timer is started. Symptoms: BGP process in a Cisco ASR series router that is being used as a route reflector may restart with a watchdog timeout message.

Conditions: This issue may be triggered by route-flaps in a scaled scenario where the route reflector may have route reflector clients and might be processing more than a million routes. The earlier versions are not affected. This can only happen for same prefixes with different mask length, e.

Assume there is a prefix, It has been allocated a label of If the allocated label changes from 16 to 17, e. However, before BGP import happens, if there is a more specific prefix, e. RT policy. Workaround: Remove RT or import map and re-added it back. However, please note, if the above condition happens again, the issue could be seen again.

BRAS sh pppoe summary. PTA : Locally terminated sessions. TOTAL 57 56 0 1. Port-channel 57 56 0 1. BRAS show platform isg session-count 4. Sessions on a port-channel are instantiated on all member ports. Port-group Sess-instance Max Sess-instance. Sessions negotiate, disconnect and attempt to renegotiate port-channel number other than port-channel 2. Workaround: Change port-channel number to port-channel 2.

Configure sessions to terminate on stand-alone ports. The show ip wccp service detail command displays a WCCP client mask assignment table while, at the same time, the service group mask assignments are changed. Instead, use the clients and assignment keywords. For example, if mask assignments may be changing, use the following two commands:.

Symptoms: Router crashes with high scale and a lot of BGP routes and scaled mpls l3 vpns enabled. This crash is seen in the box when core links flap. Conditions: This symptom is seen when scaled box with a lot of BGP routes crashes the box when some of the core links flap.

Setup had scaled mpls l3 vpns enabled. Symptoms: A Cisco series router crashes with the following logs:. Frames of RPC pm-cp process pid on 6 proc slot after blocking rpc. Failed to send card online to CP, slot 2. Conditions: This symptom occurs several seconds before the reload, when the following message is seen in the logs:. Conditions: This symptom may be caused by switchover during scaled conditions.

The inbound interface indicates frame and CRC errors. The reported tested release and combination is as follows:. Workaround: Reconfigure the clock source command in the following order:. Type clock source line in controller configuration mode. Type clock source internal in controller configuration mode. After this configuration, the symptom is cleared. However, after reloading the chassis, the issue recurs. Massive route churn happens for example, session reset with RR.

There is no functionality impact. Conditions: The symptom is observed after shutting down the link. Conditions: This symptom is seen when the user password is larger then 32 bytes and is being reduced to exactly 32 bytes. Workaround: Do not use 32 bytes as the size for the user password. In case the error occurs, the only method to solve the issue is to reload the device. Workaround: Redundant LANs may not be necessary in first place. If it is required, if mutual redistribution is done, then while doing graceful shutdown, sufficient time should be given for one process to be shutdown completely before executing the second shutdown command.

This should resolve the problem. Further Problem Description: In a normal scenario, a zombie DRDB or path entry a temporary DRDB entry which is deleted as soon as processing of the packet is done would be created only for reply message. But here, due to the redundancy in LAN and EIGRP processes in this scenario, a query sent on one interface comes back on the other which causes this zombie entry creation for the query also.

In the query function flow it is expected that this zombie entry will not be deleted immediately, rather it is to be deleted only after a reply for the query is sent successfully. At this point, i. However if a particular path is threaded to be sent, in this case it is scheduled for a reply message, the path is not deleted and an error message is printed.

However the flow continues and the prefix itself is deleted. This results in a dangling path without the existence of any prefix entry. Now when the neighbors are deleted, the flushing of the packets to be sent will lead to crash since it does not find the prefix corresponding to the path. The solution is to unthread from the paths from sending before deletion.

A similar condition will occur if the packetization timer expiry is not kicked in immediately to send the DRDBs threaded to be sent and a topology shutdown flow comes to execute first. Conditions: This symptom occurs when the encapsulation is changed. Symptoms: A crash occurs when modifying or unconfiguring a loopback interface. Workaround: Unconfiguring BGP may prevent the issue from happening without reloading the router.

CLNS route will be cleared after 10 minutes when isis ages out the stale routes. Symptoms: A DHCP release received on a different member link of a PC other than the one on which it was requested is considered as fake and dropped. Further Problem Description: In case of a port-ch, the stored hwidb for a binding is that of the bridge interface.

When a release is received on the other member-links, the hwidb does not match. Apply it on multilink interfaces - multilink1 and multilink2. Rebooting the router will reject this configuration. Also, if a redundant RP system and the release support config-sync matching feature, it will cause config-sync mismatch and standby continuous reload.

Conditions: This symptom occurs when a user changes the VRF assignment. Workaround 2: Clear the xconnect peer for the newly elected peer. Workaround: Use an IPv6 neighbor address with bits. Set some higher bits along with the IPv4 mapped address. Conditions: This symptom occurs when doing a sweep ping with sizes to Symptoms: Router fails to send withdraws for prefixes, when bgp deterministic-med is configured. This could lead to traffic blackholing and routing loops. This could also result in memory corruption or crash in rare conditions.

Conditions: This symptom can happen only when bgp deterministic-med is configured. It is further recommended to do a SSO on routers that are running impacted software to eliminate any potential corruption that might have already existed on routers that are running impacted software. Further Problem Description: If deterministic med is enabled, withdraws are not sent. Symptoms: A device configured with ip helper-address drops packets because of a zero hardware address check.

Conditions: This symptom occurs when the hardware address is zero. Symptoms: In some cases, multicast traffic stops to flow on some subinterfaces upon router reload. Symptoms: A Cisco series router may experience the following error conditions:. This is expected if it happens for a short duration and is not associated with the second symptom mentioned below.

As a result, the communication infra will fail to carry application data from one point to another within the router. This in turn would lead to failure of multiple features that are dependent on the ICC. For example: The ICC flow control can be verified by the following command:.

BFW01 sh icc flowcontrol. If the flow control is turned on for a genuine reason, it will be turned OFF in a short while. This is expected. However, in this case, because of a bug in accounting, the flow control is turned ON when not required , and never gets turned OFF, leading to the above situation. This issue may be caused by heavy route flaps or interface flaps. Symptoms: A no shut on an administratively down interface may result in overruns on other interfaces that are forwarding traffic.

This occurs on ports being no shut for the first time in the same ASIC group. Conditions: This symptom occurs after a few minutes of HA cutover. For those from the sw-mcast region, the LTL cc makes a callback to retrieve the gpid list to program the fpoe for the LTL.

Repeated attempts to exploit this vulnerability could result in a sustained denial of service DoS condition. Cisco has released free software updates that address this vulnerability. Workarounds that mitigate this vulnerability are available. This advisory is available at the following link:. The core PIM still works normally. The show buffers command shows that the count reaches 0 in free list.

Interface buffer pools:. Medium buffers, bytes total , permanent , peak Conditions: This issue is seen post bootup. The Cisco series router in HA is required to hit the issue. The show buffers old command shows some buffers hanging on EOBC buffers list for a long time, weeks or more. The issue is a corner case, and buffer leak rate is slow. This DDTS fixes leaks for the mls cef maximum-routes and mls cef adjacency-mcast commands.

The show buffers old packet command output will be either E7 OR Workaround: Reload the supervisor to clear the leaked buffers. An unauthenticated, remote attacker could exploit this vulnerability by attempting a reverse SSH login with a crafted username. Successful exploitation of this vulnerability could allow an attacker to create a DoS condition by causing the device to reload.

Repeated exploits could create a sustained DoS condition. Devices that are not configured to accept SSHv2 connections are not affected by this vulnerability. Workaround: Use show mls cef ip prefix and show mls cef ipv6 prefix instead. Symptoms: ARP failure is seen with the following show command:. Conditions: This symptom occurs during deletion and readdition of the VRF with the multicast MDT configured and P2P tunnels as the access-facing interface, along with Gigabit subinterfaces.

This issue is seen under the following conditions:. Use a sip line card as the access-facing line card. Add the same VRF again after a second interval. Observe the ARP failure on the Gigabit subinterface. Symptoms: The tunnel-encap entry is wrongly programmed. The following show command is used:. Observe the tunnel-encap entry wrong programmed on the SP, with corrupt values.

Workaround: Execute the clear ip route command for the affected prefix. Symptoms: The following error messages are displayed:. Conditions: This symptom is not caused by any specific conditions. Conditions: No conditions but this is a rarely observed issue. Conditions: This symptom occurs while configuring multiple pools on the server and multiple secondary IP addresses on the relay loopback IP address.

Label mismatch may also be seen. Conditions: These symptoms are only observed with routes with the same prefix, but a different mask length. For example, These issues are not easily seen and are found through code walkthrough. For symptom 1, each update group is allocated an advertised-bit that is stored at BGP net. This issue is seen when the number of update groups increases and if BGP needs to reallocate advertised-bits. For symptom 2, if among the same routes with a different prefix length, if more specific routes Workaround for symptom 1: Remove import-route target and reconfigure route-target.

Workaround for symptom 2: Clear ip route x. A vulnerability exists in the Cisco IOS Software that may allow a remote application or device to exceed its authorization level when authentication, authorization, and accounting AAA authorization is used.

Cisco has released free software updates that address these vulnerabilities. The HTTP server may be disabled as a workaround for the vulnerability described in this advisory. Symptoms: Disposition traffic gets dropped after SSO as the new local labels allocated by AToM do not get programmed on the line cards. Conditions: This symptom occurs when pseudowires are configured on the setup without graceful restart configured.

Then, SSO is performed and two local labels have the same disposition information. This really manifests as a traffic drop issue when the scale is high. Workaround: Configuring graceful restart resolves this issue. This is due to misprogrammed adjacency in the hardware. Conditions: This symptom occurs when unconfiguring the MDT default configuration.

Symptoms: Standby SUP crash is observed on the Cisco router after upgrade to csadvipservicesk9-mz. This issue is random and recurring. Tracebacks are generated with the following error message:. Conditions: This symptom is observed on the Cisco router after upgrade to csadvipservicesk9-mz. Conditions: This symptom is observed on a Cisco series router after deletion and re creation of a VRF. Workaround: Do not delete VRFs. All configuration related to a VRF can safely be removed.

Only the VRF name should be retained in the configuration. Symptoms: The system may experience delays in updating multicast information on the line cards. In the worst case, the line card may become disconnected if timeouts continue for a long period. Workaround: Take necessary actions, if possible, to reduce the IPC load. Sometimes, the IPC load could be due to noncritical processes. Symptoms: BGP IPv6 routes that originate from the local router via network statements or redistribute commands fail to match any specified condition in an outbound route map used on a neighbor statement, regardless of the expected matching results.

Thus, the route map may not be applied correctly, resulting in erroneous filtering or advertising of unintended routes. Further testing revealed that the suppress-map and unsuppress-map commands used in conjunction with the aggregate-address command are also broken, in the sense that the route-map filtering will fail to correctly suppress or unsuppress a subnet under the aggregated prefix. Workaround: None for the same router.

However, inbound route maps work fine, so configuring inbound route maps on the neighboring router can compensate. Another way to handle it would be to configure prefix lists directly on the network statement. So filtering will be preserved. Conditions: This symptom is observed during deletion and addition of VRFs. VRF should be removed before deleting the P2P tunnels for this to happen.

Conditions: This symptom occurs when the prefix of the intercepted target IP flaps. Workaround: Remove the tap configuration for flapping prefix. Entries from Bank 0. Entries from Bank 1. This is a workaround for a hardware problem with Tycho. This workaround is required only if there are aggregate labels programmed in the superman VPN cam, but can get set incorrectly even when there is no VRF configuration on the box.

Workaround 3: If the LI target prefix flaps, make sure to avoid it, if possible. Conditions: This symptom is observed when the new version of PAs do not come up with enhanced flexwan. Without the PA, flexwan will come up. Symptoms: More traffic is sent out because of stale MET entries.

Conditions: This symptom occurs in a scale condition when the route towards the core on the source PE is changed. Symptoms: The SNMP graph traffic rate collected from the port-channel subinterface does not match the 5-minute offered rate from show policy-map inter port-channel x.

This issue is seen only when there is EARL recirculation of packets and affects only the ingress traffic rate. This issue is seen when the target route is flapped. Symptoms: The BGP next hop is inaccessible. The show ip route command output in the global and VRF routing tables shows that the next hop is reachable. The show ip bgp vpnv4 all attr next-hop command output shows max metric for the next hop.

Workaround 1: If set ip next-hop is not configured in import route map, this issue does not occur. Workaround 2: If neighbor x. Workaround 3: If neighbor x. Successful exploitation of this vulnerability may prevent traffic from transiting the affected interfaces. Cisco has released free software updates that addresses this vulnerability. There are no workarounds for this vulnerability. Conditions: This symptom is observed after doing SSO.

Conditions: This symptom occurs if the queue-limit is incorrectly calculated. Workaround: Configure a queue-limit explicitly to fix this issue. PE2 config no ip flow-export destination PE2 show monitor event-trace idbman all i NDE. PE2 show vlan internal usage i NDE. PE2 test platform debugger callfn name. Symptoms: The bgp network backdoor command does not have any effect.

Workaround: Unconfigure and reconfigure the network backdoor. Symptoms: A Cisco subinterface that is configured for bridging after router reload sends traffic even when being shutdown. This traffic is sent from physical interface to which subinterface correspond and further received on the other side of the link.

Conditions: This symptom is seen when bridging is configured on subinterface. Deleting subinterface, and then recreating it does not fix the issue. Conditions: This symptom is seen after HA switchover. Workaround: Remove the port-channel and RG configuration and add back again. Symptoms: The router crashes with traceback error messages and the standby takes over. After this, the router is stable. Conditions: There is no known trigger or changes that were made as per the user update.

Conditions: This symptom is observed under the following conditions:. Create a subinterface vlan for EOAM communication. Create a QinQ subinterface vlan tags: for subscriber on the same physical interface. Symptoms: The show buffers command output displays:. Increased missed counters on EOBC buffers. The leak is small. It is a leak of 64 bytes per buffer that is leaked, and the leak appears to be very slow. Conditions: The show buffers old command output displays some buffers hanging on the EOBC buffers list for a really long time, such as weeks or even more.

This issue is a corner case and the buffer leak rate is slow. And, if we look at the ICC header at the underscored items Workaround 2: Unconfigure or reconfigure local connect. Crash will also be seen on running the no service dhcp.

From an DHCP autoinstall attempt during router startup with no nvram config. If the ip address dhcp is run on one of the interfaces. If the router was used for DHCP proxy client operations. The relay processes are started when a DHCP pool is created by the ip dhcp pool pool command.

In addition, do not execute the no service dhcp command. This section describes only select open caveats. Symptoms: The router may crash while clearing a large number of RP mappings. This issue is seen when you run the clear ip pim rp-map command several times. Workaround: Do not run the clear ip pim rp-map command several times in succession.

Conditions: This symptom is observed only when configuring from tclsh. Workaround: Use the end command specifically to avoid any leaks. Conditions: The symptom is observed when you configure the ipv6 nd ra suppress command. This command is only intended to suppress periodic mcast RAs.

The router will still respond to unicast RS that is intended behavior. All the vulnerabilities described in this document are caused by packets in transit on the affected devices when those packets require application layer translation. Symptoms: The VTY performing the configuration hangs. The console is still alive, but is not very responsive. The show processes cpu command output shows high CPU utilization.

Conditions: This symptom occurs when configuring call policy sets with a large number of entries. Workaround: Around entries seems to work. Thus, limit the number of entries. Symptoms: The last fragment causes a crash because of an invalid zone value. Then, the last fragment causes the crash because of an invalid zone value. Conditions: This symptom occurs when the GRE tunnel is configured for the default global routing table.

Symptoms: Accounting-stop record is sent for radius proxy session when reauthentication happens for that session. Conditions: This symptom is seen in the following scenarios:. The authentication request comes from AP. ISG receives a reauthentication request from AP. The Accounting-stop record is sent for Radius-Proxy session and the services under the session, but the radius-proxy session is still active and no stop record is sent for the session on clearing the session.

Also, acct-terminate-cause in the stop record is set to none. These vulnerabilities are:. Workarounds that mitigate these vulnerabilities are available. Conditions: This symptom occurs when configuring call policy sets with a large number of tables.

Workaround: Around tables seems to work. Thus, limit the number of tables. Symptoms: The service policy applied to a service instance stops forwarding any traffic. The conform counter does not increase at all and all traffic is dropped.

This issue is applicable for the service policy policing or LLQ applied for ingress or egress traffic. Removing and reapplying service-policy may clear the condition temporarily, but it can reappear. The issue is specific to policers. If possible, shapers can be used instead of policers to avoid the issue.

Symptoms: Performance Routing PfR traffic class fails to transition out of the default state. Conditions: When a subinterface is used as an external interface and the corresponding physical interface goes down and comes up, the PfR master is not notified that the subinterface is a backup.

Symptoms: Standby reloading occurs due to configuration synchronization. Conditions: This symptom occurs when you try to modify the parameters, for example, Peak value, of a vp that is already created. Symptoms: When a member-link is removed from an L2 port-channel a port-channel with switchport configured under it , the traffic stops flowing. Conditions: This symptom occurs when a member link of L2 port-channel that is passing traffic is removed from the port-channel.

Workaround: Remove and add the port-channel configurations again. Symptoms: Service instances on the line card go to the down state for the approximately first service instances of service instances after a test crash on the line card, resulting in a complete traffic drop on these service instances. Conditions: This symptom occurs only during the first test crash on the LC after booting up the router.

One member of the link is removed. Conditions: This issue is noticed when traffic is pumped onto the DUT from remote end. The size could be as low as bytes. When you create one or more than one t1 channel groups in a CT3 interface.

When you create one link per channel group. When the multilink interfaces fail to come up. Conditions: This issue is observed when LI is enabled and there are multiple media sessions in a single call that is, SDP contains information about multiple media sessions. Conditions: This symptom is observed when several hits and failures are seen for medium buffers. All are linktype IPC. Conditions: This symptom occurs with the following conditions:. Conditions: This symptom is observed when core facing is a port channel on ES Run the following commands to verify whether you are facing this issue:.

Symptoms: All MVPN traffic is getting blackholed when peer is reachable using a TE Tunnel, and an interface flap is done so that secondary path can be selected. The multicast route does not contain a native path using the physical interface. Workaround: Issue the clear ip ospf process command on the core router. Conditions: This symptom is observed when lawful intercept taps are configured on the router. Symptoms: Align messages are seen when enabling the debug cwan atom debug command.

Conditions: This symptom is observed when the cwan atom debug command is enabled. Spurious memory access messages are seen on the router console. Conditions: This symptom occurs when the real moves to FAILED state because of real failure that is detected by the inband failure mechanism. The user-defined MBS value is not shown in the show atm pvc command output. When MBS does not reflect the configured value. Its value is always based on MTU size.

Symptoms: Multicast traffic does not pass through an ATM point to a multipoint subinterface. Workaround: Run the clear adjacency command to force repopulating the incomplete adjacency. Note that you should be aware of the impact of this system-wide command. As an alternative, use unicast commutation if it is possible to do so. The vlans used in the previous config cannot be effectively used on those ports, not even by changing the service instance numbers.

It is observed that the Cisco IOS still believes that the port is configured though there is no configuration yet. Conditions: This symptom occurs only with module clear-config configured. A complete reload would probably resolve this issue. The clear mfib linecard command does not correct the line card table states. Workaround: There is no workaround other than line card reload. Workaround 1: Broadcast storm control could be used to rate-limit arp broadcast packets.

Then, dscp-transparency enabled using the following CLI:. Symptoms: When the Spoke dynamic peer group is configured before the iBGP static peer group, the two iBGP static neighbors fail to establish adjacency. Conditions: This symptom is observed when the Spoke dynamic peer group is configured before the iBGP static peer group.

Workaround: If the order of creation is flipped, the two iBGP static neighbors will establish adjacency. Symptoms: The bgp peer router crashes after executing the clear bgp ipv4 unicast peer command on the router. This issue can occur during router reload.

Conditions: This symptom is observed for scaled mvpn gre configs when more gre mdt tunnels come up. Conditions: This symptom is observed during an 8k session. Conditions: This symptom is observed with the following conditions:. The neighbor is configured with soft-reconfiguration inbound.

The inbound routemap is not configured for the neighbor. The non-routemap inbound policy filter-list allows the path. Workaround: Instead of using the non-routemap inbound policy, use the routemap inbound policy to filter the prefixes. Workaround: Unconfigure BFD on the interface, and then reconfigure it. Then, the session will come up. Symptoms: The LNS router hangs up at the interrupt level and goes into an infinite loop. Conditions: This symptom occurs during control channel cleanup.

This symptom can be only removed through power cycle. Workaround: Flap the interface where the OIF is going. Symptoms: When configuring a service instance under the physical interface, the service instance may not be programmed properly on the Switch Processor or the line card, leading to loss of connectivity. Workaround: Configure the port in a channel-group and move the service instance configuration under the port-channel interface. After investigation, it was found that this is purely a timing-based issue.

In case the peer list is cleaned up, and then the Hello process tries to calculate the size of a particular peer, then it finds the peer as NULL and crashes. Workaround 2: Execute the clear ipv6 ospf force-spf command on ABR. Symptoms: The standby router reloads when you use the ip extcommunity-list 55 permit deny command, and then the no ip extcommunity-list 55 permit deny command. An automatic check will verify that your e-mail address is registered with Cisco.

If the check is successful, account details with a new random password will be e-mailed to you. Qualified users can establish an account on Cisco. We recommend that you view the field notices for this release to see if your software or hardware platforms are affected. Visit the Download Software page on Cisco. The following documents and websites provide assistance with troubleshooting your Cisco hardware and software:. Skip to content Skip to search Skip to footer.

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