topic Re: Fault Tolerance not working between CSMs in Application Networking

Fault Tolerance not working between CSMs

donald.james — Tue, 08 Apr 2008 12:33:02 GMT

I have two CSM modules in two differnt switches (Bridge mode) configured for high availability. After noticing one of the CSM modules was in failed mode, I reset the module. While the module reboots I get the following messages: %CSM_SLB-4-REDUNDANCY_WARN: Module 3 FT warning: LRP: no ACK from standby.. standby may be down

%CSM_SLB-4-TOPOLOGY: Module 3 warning: IP address conflict: ARP frame from 170.41.228.10 with MAC 00:01:64:f9:

1a:07 received on VLAN 2.

With both online a "show mod csm 3 ft" shows both modules active.

I can no longer access the real servers.

When I remove the module that I reset (Primary) I can access the servers using the backup CSM.

Whe I remove the backup CSM and insert the Primary, I cannot acces the servers once again.

The FT vlan is VLAN 7 configured on both switches and is the only allowed VLAN on the trunk.

The config for the Primary CSM is:redundancy

mode sso

main-cpu

auto-sync running-config

spanning-tree mode pvst

module ContentSwitchingModule 3

ft group 7 vlan 7

priority 30

preempt

vlan 2 client

ip address 170.41.228.20 255.255.255.192

gateway 170.41.228.1

vlan 8 server

ip address 170.41.228.20 255.255.255.192

probe CARMENWEBPROBE tcp

interval 10

failed 100

probe HTTPS tcp

interval 10

failed 100

port 443

serverfarm CARMENWEBFARM

nat server

no nat client

real 170.41.228.15

inservice

real 170.41.228.16

inservice

probe HTTPS

vserver CARMENVSERVER

virtual 170.41.228.10 tcp 0

serverfarm CARMENWEBFARM

persistent rebalance

inservice

Trunk for VLAN 7 config :

interface GigabitEthernet4/2

switchport

switchport trunk encapsulation isl

switchport trunk allowed vlan 7

switchport mode trunk

no ip address

logging event link-status

logging event spanning-tree status

logging event trunk-status

Has anyone had this problem?

Thanks, Donald

Re: Fault Tolerance not working between CSMs

Gilles Dufour — Tue, 08 Apr 2008 13:53:31 GMT

have you tried to swap cards ?

Take the working standby and move it to the chassis of the not-working active.

See if the problem stick to the card or the chassis.

Then try to use one CSM at a time and use sniffer trace to see if a ping from csm to server get out of the blade.

Gilles.

Re: Fault Tolerance not working between CSMs

donald.james — Tue, 08 Apr 2008 15:06:54 GMT

The plan is to take a working CSM from a DR site with the same config to try in place of the not working active. I did not want to risk taking the working stanby and moving it and possibly having an outage at this time since this is a production switch being heavily utilized at the moment. I wanted to verify there was not something in the config that was not configured properly.

Re: Fault Tolerance not working between CSMs

g-hopkinson — Fri, 18 Jul 2008 10:53:24 GMT

Have you resolved this issue as I have something similar?