Cisco 7600-ES20-GE3CXL-RF - Ethernet Services 20G Line Card Switch Instrukcja Użytkownika Pobierz pdf (Strona 262)

708

Caveats for Cisco IOS Release 12.2(33)SRD through 12.2(33)SRD8

OL-10394-05 Rev. R0

• CSCsl05874

Symptoms: A Cisco router that is configured with MPLS might have problems forwarding MPLS

packets if fragmentation of these packets is required.

Conditions: This symptom is observed on a Cisco 7200 with NPE-G1 that is running Cisco IOS

Release 12.2(31)SB6 and SB7 but could be present in other platforms and releases.

If the router needs to send large MPLS packets, the issue might appear when the router needs to

fragment them (due to MTU constraints).

Impact: Traffic broken for large packets.

Workaround: There is no workaround.

• CSCsl06110

Symptoms: Port-channel interfaces are ignored when read from the DHCP snooping database

Conditions: When the DHCP snooping database is read in, entries pointing to port channel interfaces

are ignored.

Workaround: There is no workaround.

Further Problem Description: This is a fairly uncommon case. The database is only read in on a full

reload or if forced manually. In normal operation, port-channel interfaces can be used as DHCP

snooping interfaces with no adverse effects.

• CSCsl06336

Symptoms: When the maximum-paths n import command is unconfigured, for example, a no

maximum-paths n import m command is issued for a VPN/VRF on a router, sometimes the routes

in that VPN may have duplicate path entries.

For example:

diezmil#sh ip /jointfilesconvert/422273/bgp vpnv4 v v1001 10.0.20.0 BGP routing table entry for

100:1001:10.0.20.0/24, version 1342275 Paths: (2 available, best #1, table v1001)

Flag: 0x420 Not advertised to any peer 65164, imported path from 100:1:10.0.20.0/24

192.168.1.7 (metric 4) from 192.168.1.254 (192.168.1.254) Origin IGP, metric 1552,

localpref 80833, valid, internal, best Extended Community: RT:100:1001 Originator:

192.168.1.7, Cluster list: 192.168.2.7 mpls labels in/out nolabel/291 65164, imported

path from 100:1:10.0.20.0/24 192.168.1.7 (metric 4) from 192.168.1.253 (192.168.1.253)

Origin IGP, metric 1552, localpref 80833, valid, internal Extended Community:

RT:100:1001 Originator: 192.168.1.7, Cluster list: 192.168.2.7 mpls labels in/out

nolabel/291

Workaround: The least resource-intensive workaround is to configure and unconfigure a dummy

import map under that VPN/VRF. Clearing the affected BGP sessions on PEs also resolves the issue.

• CSCsl07297

Symptoms: Router may crash when a sequence of commands are executed in quick succession.

Conditions: Occurs when a Border Gateway Protocol (BGP) neighbor belongs to a particular peer

group and the following commands are entered in quick succession: * no neighbor a.b.c.d

peer-group pgroup-name * no neighbor a.b.c.d description xyz If these commands executed

quickly, such as when they are pasted into the interface, the router may crash.

Workaround: Use the no neighbor a.b.c.d peer-group pgroup-name command to remove the

neighbor. This command removes the neighbor and eliminates the need for the second command.

• CSCsl09874

Symptoms: OSPF may generate traceback when interface of router goes down or shut down

administratively.

Conditions: Affects Cisco IOS Release 12.4(15)T and later and Cisco IOS Release 12.2SRC.

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