User manual

Release Notes for Catalyst 6500 Series Content Switching Module Software Release 2.2(8)

78-12569-16

Caveats

This condition causes performance problems with the next in-service server. In the worst case

scenario, this condition may cause the next in-service server to fail, which in turn may cause the

servers in the server farm to fail.

• CSCdw81611

The CSM drops or corrupts UDP fragments. This issue was originally introduced in Release 2.1.1

and is resolved in Release 2.2.1. Both the drop and the corruption issues are located only in

fragments other than the first fragment. In the affected fragments, the CSM is incorrectly

interpreting the payload of the frame as UDP port information.

• CSCdx04521

The system hangs during IP Option processing. When the CSM receives IP frames with more than

~5 IP options, it is possible that the device will fail.

This issue exists in CSM releases 1.x, 2.1(1), 2.1(2), and 2.2(1). It is resolved in releases 2.1(3) and

2.2(2).

• CSCdx16156

The CSM does not forward to an HSRP router address without a gateway command. This issue exists

in the following CSM releases: 1.x, 2.1(1), 2.1(2), 2.2(1). This caveat is fixed in all other CSM

releases, such as 2.1(3) and 2.2(2).

Due to some internal optimizations to improve overall network throughput, the CSM must listen to

HSRP protocol signalling in order to properly learn the HSRP virtual MAC address, for example the

HSRP MAC address shared between the active and standby HSRP routers.

To allow the CSM to learn the HSRP virtual MAC address for an HSRP virtual router IP address,

you must explicitly configure the HSRP virtual router IP address as a gateway in the VLAN

submode under the module csm mod_num command. If you configure a route command pointing to

the HSRP gateway, the CSM does not properly learn the HSRP information.

If the CSM does not properly learn the HSRP virtual MAC address, the following symptoms may

occur:

–

Connections coming from the HSRP router through the CSM are dropped.

–

The CSM sends frames to the physical MAC address on the active HSRP router, not the HSRP

virtual MAC address.

–

Connections may take an unusually long time to be replicated from the active to the standby

CSM if connection redundancy is enabled between two CSMs.

Workaround: Configure the HSRP router using the gateway command, not the route command.

• CSCdx20633

DNS probe functionality has changed slightly.

–

If an address has not been configured, then any non-error DNS response is considered healthy.

–

If addresses have been configured, the DNS server must respond definitively with one of the

configured addresses to consider the server healthy.