Cisco 7600-ES20-GE3CXL-RF - Ethernet Services 20G Line Card Switch Manual de usuario Pagina 73

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519
Caveats for Cisco IOS Release 12.2(33)SRD through 12.2(33)SRD8
OL-10394-05 Rev. R0
Workaround: There are two workarounds for this issue. Both require that every port on the ES20 be
configured prior to a switchover. If this is done, then the problem will not exist after a switchover
and new EVCs can be successfully added following the switchover.
1. Configure at least one service instance under each interface on the ES20. An example is shown
below:
interface GigabitEthernet1/0/3
service instance 1 ethernet
encapsulation dot1q 3
2. Configure “ethernet uni id name under each interface on the ES20. An example is shown below:
interface GigabitEthernet1/0/5
ethernet uni id gi_1_0_5
CSCtd54338
Symptoms: The following output from the command show ip rtp header-compression, shows that
one channelized serial interface has a large accumulated number of “seconds since line card sent last
stats update” compared with another channelized serial interfaces in device with the same platform:
GR_SA_CORE_7613R_1#show ip rtp header-compression Serial1/2/0.1/3/1:0
RTP/UDP/IP header compression statistics:
Interface Serial1/2/0.1/3/1:0 (compression on, Cisco)
Distributed fast switched:
10364 seconds since line card sent last stats update
Rcvd: 0 total, 0 compressed, 0 errors, 0 status msgs
0 dropped, 0 buffer copies, 0 buffer failures
Sent: 0 total, 0 compressed, 0 status msgs, 0 not predicted
0 bytes saved, 0 bytes sent
Connect: 16 rx slots, 16 tx slots,
0 misses, 0 collisions, 0 negative cache hits, 0 free contexts
Conditions: The symptom is observed with the following conditions:
Cisco IOS Release 12.2(33)SRD3.
Platform: Cisco 7613 router.
RP: RSP720-3CXL-GE.
SIP: Cisco 7600 SIP-200.
SPA: SPA-1XCHSTM1/OC3.
This issue normally begins to show when the count of the channelized subinterface (number of cRTP
sessions) is 200 or over.
Workaround: Disable then enable RTP header-compression on the interface.
Further Problem Description: The issue can be resolved by using disable cRTP and enable cRTP
on each subinterface (see DDTS CSCso48621). However, sometimes the problem can reoccur in a
few days after recovery on the same subinterface.
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