Cisco 7600-ES20-GE3CXL-RF - Ethernet Services 20G Line Card Switch Manual de usuario descargar pdf (Pagina 176)

622

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

OL-10394-05 Rev. R0

Setting the MSS to a slightly lower value (-20 to -40) is sufficient to avoid the issue. This number

actually accounts for the length of TCP options present in each segment. The maximum length of

TCP option bytes is 40.

If the customer is using MD5, Timestamp, and SACK, the current MSS should be decreased by 40

bytes. However, if the customer is using only MD5, the current MSS should be decreased by 20

bytes. This should be enough to avoid the problem. For example:

1. If the current MSS of the session is 1460, New MSS = 1460 - 40 = 1420 (accounts for maximum

TCP option bytes; recommended).

2. If the current MSS of the session is 1460, New MSS = 1460 - 20 = 1440 (accounts for only the

MD5 option).

• CSCsx33961

Symptoms: SNMP engine consumes 100% CPU and device does not respond to SNMP polls.

Conditions: Occurs when ATM SPA subinterface counters, such as ifInOctets and ifOutOctets are

being polled with multiple Varbinds in single SNMP PDU.

Workaround: There is no workaround.

• CSCsx34297

Symptoms: Watchdog reset seen with combination of NPEG1+PA-POS-1OC3/PA-POS-2OC3.

Conditions: The symptom is observed on a Cisco 7200 series router and Cisco 7301 router with an

NPEG1 processor.

Workaround: Change the MDL of operation to PULL using the command dma enable pull model.

• CSCsx35306

Symptoms: Router crashes at “t3e3_ec_safe_start_push”.

Conditions: The crash is seen immediately after removing the channel-group of the

PA-MC-2T3/E3-EC card.

Workaround: There is no workaround.

• CSCsx37313

Symptoms: When using encapsulation PPP on a POS SPA OC192POS-XFP in a SIP-600, the

protocol comes up on both sides and IP Control Protocol (IPCP) is open for PPP. Pinging the remote

side fails due to corruption of the PPP frame.

Conditions: Occurs when using encapsulation PPP on a POS SPA OC192POS-XFP

Workaround: Use High-Level Data Link Control (HDLC) encapsulation.

• CSCsx37431

Symptoms: CE-to-CE ping for packet size less than 48 bytes fails or applications like telnet fail.

Conditions: Occurs with ATM SPA on SIP200. ATM PA on FW2 should be one of the CEs facing,

while other PEe should be 7200

Workaround: There is no workaround.

• CSCsx39405

Symptoms: When unconfiguring multicast distribution tree (MDT) and VPN routing/forwarding

(VRF), SP crashes.

Conditions: The problem occurs on scale setup. When number of entries is large on PI multicast

side, the PI process can get suspended during delete operation

Workaround: There is no workaround.

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