Cisco 7600-ES20-GE3CXL-RF - Ethernet Services 20G Line Card Switch Manual de usuario descargar pdf (Pagina 104)

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

OL-10394-05 Rev. R0

Symptoms: Router crashes with memory corruption.

Conditions: Occurs when BFD is configured on 10GigE interfaces and constant link flaps.

Workaround: There is no workaround.

• CSCsy88134

Symptoms: When using an ES-40 10GE linecard, if the MAC layer of the WAN connection goes

down, but the optical PCS layer remains up, the ES-40 port will never realize the link is down and

will instead always keep the interface Up/Up. 10G ports in the ES+ family of line cards do not take

advantage of link fault signalling by peer.

Protocols relying on fast reconvergence, will not be able to take advantage of the 10G link fault

signalling.

Conditions: This problem can occur on any 10GE interface on an ES-40 line card when the remote

transceiver or repeater keeps the PCS layer up but takes the MAC layer down.

The Link layer detection algorithm for 10G ports in the ES+ does not consider a Remote Fault

signalled by the peer end. Thus link will continue to show as Link-Up, even though the remote end

MAC has experienced a RX FAULT and did not happen to switch off the laser

Workaround: There is no workaround except to rely on higher layer protocols that send hellos or

keepalives to determine when the link goes down and reroute around the failure with those protocols.

Line protocol will never go down when the PCS layer is up on an ES-40 line card.

• CSCsy88640

Symptoms: A core dump may fail to write, with the following errors seen on the console:

current memory block, bp = 0x4B5400A0,

memorypool type is Exception

data check, ptr = 0x4B5400D0

bp->next(0x00000000) not in any mempool

bp_prev(0x00000000) not in any mempool

writing compressed ftp://10.0.0.1/testuncached_iomem_region.Z

[Failed]

writing compressed ftp://10.0.0.1/testiomem.Z

[Failed]

writing compressed ftp://10.0.0.1/test.Z

[Failed]

%No memory available

Conditions: This is only seen for memory corruption crashes when "exception region-size" is

configured to a value that is not divisible by 4.

Workaround: The recommended setting for exception region-size is 262144 in newer images. In

older images, where the maximum configurable value is 65536, use the maximum.

• CSCsy96407

Symptoms: Downstream traffic stopped after delete/recover of sub-interface configuration while

sessions are up.

Conditions: Occurred with the following configuration:

* L2access IP aggregation session

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Cisco 7600-ES20-GE3CXL-RF - Ethernet Services 20G Line Card Switch Manual de usuario Pagina 104

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