User manual

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

78-12569-16

Caveats

Open Caveats in Release 2.2(2)

This section describes known limitations that exist in CSM software release 2.2(2).

• CSCdx17864

When Layer 7 features are enabled on the CSM, the CSM may drop the IP frames it receives if those

frames contain multiple IP options. The following features require Layer 7 functionality: URL

regular expression matching, cookie regular expression matching, cookie sticky, URL hash sticky,

SSL ID sticky, and generic HTTP header parsing. This issue exists in the following CSM releases:

1.x, 2.1(1), 2.1(2), 2.1(3) 2.2(1), 2.2(2).

Workaround: Multiple IP options are not common in networks, but you can disable the Layer 7

features if this issue causes a problem.

• CSCdx16168

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

HSRP protocol signalling to properly learn the HSRP virtual MAC address that is shared between

the active and standby HSRP routers.

The caveat is that the HSRP learning code in the CSM assumes that any given HSRP group appears

on only one VLAN. If the same HSRP group appears on two different VLANs, the HSRP virtual

MAC for the group is learned for only one of these VLANs.

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

occur:

–

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

–

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

virtual MAC address.

–

If connection redundancy is enabled between two CSMs, connections may take an unusually

long time to be replicated from the active to the standby CSM.

Workaround: Change HSRP group numbers to be globally unique.

• CSCdx12809

The CSM may fail when more than 3000 probes are configured and when there are probes of type

ICMP, TCP, and HTTP configured simultaneously.

Workaround: Reduce the number of probes, reduce the probe rate, or do not configure all three

types of probes (TCP, ICMP, and HTTP) simultaneously.

This issue exists in the following CSM releases: 1.x, 2.1(1), 2.1(2), 2.1(3), 2.2(1), and 2.2(2).

• CSCdw84018

Release 2.2 does not support RTSP UDP streaming modes when a client NAT is enabled. If this

configuration is set up, the server attempts to open a UDP connection, causing the CSM to drop

packets. Some RTSP clients then fall back on interleaved mode (inline TCP) which will work in the

application software, although the connection is sent to fastpath.

Workaround: None

• CSCdw80718

Configuring a large number of client VLANs (each configured with its own gateway) can cause the

switch console to hang and the configuration performance to be extremely slow.

Workaround: Limit the number of client-side gateways configured to a small number (less than 10).