Cisco 7600-ES20-GE3CXL-RF - Ethernet Services 20G Line Card Switch Instrukcja Użytkownika Pobierz pdf (Strona 175)

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

OL-10394-05 Rev. R0

Conditions: Occurs when Layer 2- and Layer 3-based Ethernet Virtual Circuits are configured on

the ES40. This happens after an RSP fail over or when the module is reset using the hw-module

module # reset command.

Workaround: Reload the router.

• CSCsx25316

Symptoms: A device may reload because of a crash after the command clear ip route * is executed.

Conditions: The trigger for this issue is executing the clear ip route* command in the presence of

a default route. If an RIP update is received by the router while the routing information base is being

cleared, the update will be processed causing RIP to check the state of the default route in the routing

information base. This combination has the potential to cause a crash.

The probability of the crash occurring is proportionate to the size of the routing table. The larger the

routing table, the greater the chance of encountering the problem.

Workaround: It is recommended to avoid using the clear ip route * command. If the prefix in

question is known, then use clear ip route <prefix> instead.

Further Problem Description: This problem was observed in Cisco IOS Release 12.2(33)SRC3. All

Cisco IOS SR33-based images (SRB, SRC, SRD and SB33) are vulnerable to this problem. The

problem will be seen only when using the clear ip route * command and is platform independent.

Other commands like clear ip ospf, clear ip /jointfilesconvert/422273/bgp, clear ip isis or clear ip route <prefix> are not

vulnerable.

• CSCsx27659

Symptoms: L3 traffic is blackholed after online insertion and removal (OIR) of Distributed

Forwarding Cards (DFCs).

Conditions: After an OIR, some of the adjacencies (recirculation) may not be correctly programmed

when they go online.

Workaround: Use the clear adjacency command to reprogram the adjacencies correctly. This will

impact traffic on the router.

Further Problem Description: Use the show mls cef adjacency entry <x> detail command to

diagnose. A display of “vlan=0” on recirculation adjacencies indicates this problem.

• CSCsx28948

Symptoms: Packet leak is observed on Cisco 7200 router running Cisco IOS Release 12.2(33)SRC.

Conditions: Multicast packet is forwarded to the tunnel interface, causing memory leak. Even packet

is dropped, memory leak is observed. Multicast data having less then 64 byte size is dropped at the

driver. Leak is not happening with interface other then tunnel interface.

Workaround: There is no workaround.

• CSCsx33622

Symptoms: Flapping BGP sessions are seen in the network when a Cisco IOS application sends

full-length segments along with TCP options.

Conditions: This issue is seen only in topologies where a Cisco IOS device is communicating with

a non-Cisco-IOS peer or with a Cisco IOS device on which this defect has been fixed. The router

with the fixed Cisco IOS software must advertise a lower maximum segment size (MSS) than the

non-fixed Cisco IOS device. ICMP unreachables toward the non-fixed Cisco IOS router must be

turned off, and TCP options (for example, MD5 authentication) and the ip tcp path-mtu-discovery

command must be turned on.

Workaround: Any value lower than the advertised MSS from the peer should always work.

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