User manual

41
Release Notes for Catalyst 6500 Series Content Switching Module Software Release 2.2(8)
78-12569-16
Caveats
• CSCdx78285
Under heavy load, it is possible for the CSM to reject incoming connections in the mistaken belief
that it is low on resources. If this issue occurs, you will notice a rapid increase in the values
displayed in the line entitled Pending event: Re-use too soon in the output of the show module csm
<slot> tech proc 1 command. This issue exists in CSM releases 1.x, 2.1(1), 2.1(2), 2.1(3), 2.2(1),
and 2.2(2a).
Workaround: None.
• CSCdx78343
When receiving a TCP RST (reset from the client side), the CSM incorrectly counts a connection to
a real server as having failed. Clients may send RSTs even though no failure of any form has
occurred. This count displays in the output of the show module csm slot stat and show module csm
slot real detail commands.
Workaround: When interpreting these statistics in prior releases, be aware that the statistics for
connections that are reset by the client are displayed as failed and are counted incorrectly.
• 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.
• CSCdv59690
Using the set ip dscp command in the policy submode, the CSM may be configured to stamp the
DSCP value in load balanced frames. The CSM does not correctly stamp such frames when the value
configured using this command is greater than 15. As a result, the IP checksum for such packets is
incorrect, and these packets are dropped in the network.
Workaround: Do not configure a policy with a DSCP value of 16 or above.
• CSCdy06917
The replicated call setup retry period flag for the show module csm x connection command always
displays false, even when the connection has actually been replicated to the peer CSM.
Workaround: Ignore this display from previous releases.
Open Caveats in Release 2.1(3)
This section describes known limitations that exist in CSM software release 2.1(3).
• CSCdu57891
The output from the show interface gigabit slot/port command may erroneously indicate that one
or more of the CSM gigabit ports are down.
Workaround: Ignore the display.
• CSCdu82478
In the CSM software release 2.x, it is important that packets transmitted from the CSM toward a
client (server) are transmitted on the same VLAN as packets received by the CSM from that same
client (server). This constraint may be satisfied as follows: