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CSM: config-sync damages FT configuration

grischast
Beginner
Beginner

Dear all

Two 6503 with Sup720 and CSM (WS-X6066-SLB-APC) are configured for active/standby-failover with HSRP-group-tracking. Vlan20 is the client vlan with HSRP on the router-side:

Router1# sh run int vlan20

interface Vlan20

description MSFC-CSM-link

ip address 10.0.0.2 255.255.255.248

standby 2 ip 10.0.0.1

standby 2 preempt

standby 2 name MSFC-CSM-link

Router1# sh run mod 2

module ContentSwitchingModule 2

ft group 1 vlan 5

  priority 100 alt 50

  preempt

  track group MSFC-CSM-link

  track mode any

!

vlan 20 client

  description MSFC-CSM-link

  ip address 10.0.0.3 255.255.255.248 alt 10.0.0.5 255.255.255.248

  gateway 10.0.0.1

  alias 10.0.0.6 255.255.255.248

Router2# sh run int vlan20

interface Vlan20

description MSFC-CSM-link

ip address 10.0.0.4 255.255.255.248

standby 2 ip 10.0.0.1

standby 2 priority 50

standby 2 preempt

standby 2 name MSFC-CSM-link

Router2# sh run mod 2

module ContentSwitchingModule 2

ft group 1 vlan 5

  priority 50 alt 100

  preempt

  track group MSFC-CSM-link

  track mode any

!

vlan 20 client

  description MSFC-CSM-link

  ip address 10.0.0.5 255.255.255.248 alt 10.0.0.3 255.255.255.248

  gateway 10.0.0.1

  alias 10.0.0.6 255.255.255.248

Whenever I perform

hw-module csm 2 standby config-sync

on the active chassis I get this:

Jul  7 10:18:16.415 MEST: %CSM_SLB-6-REDUNDANCY_INFO: Module 2 FT info: Active: Bulk sync started

Jul  7 10:18:16.423 MEST: %CSM_SLB-6-REDUNDANCY_INFO: Module 2 FT info: Active: Sending configurations to Standby CSM, this may take several minutes!

Jul  7 10:18:20.667 MEST: %CSM_SLB-6-REDUNDANCY_INFO: Module 2 FT info: Active: Manual bulk sync completed

Jul  7 10:18:20.667 MEST: %CSM_SLB-4-REDUNDANCY_WARN: Module 2 FT warning: Config Sync does not save Standby running-config to startup-config

Jul  7 10:18:20.875 MEST: %CSM_SLB-4-REDUNDANCY_WARN: Module 2 FT warning: FT configuration might be out of sync.

And the reason for the two CSMs being out of sync is that the line

track group MSFC-CSM-link

is gone from the FT group on the standby CSM:

Router2# sh run mod 2

module ContentSwitchingModule 2

ft group 1 vlan 5

  priority 50 alt 100

  preempt

  track mode any

If I add the missing line manually to the FT group on the standby CSM the two CSMs come back into sync after a couple of seconds:

Jul  7 10:20:18.876 MEST: %CSM_SLB-4-REDUNDANCY_WARN: Module 2 FT warning: FT configuration back in sync

This behaviour is 100% reproducable every time I perform a config synchronization. The CSM Software is version

4.3(5) on both modules.

Any clue how to get rid of this annoying problem?

Thanks for any hint and best regards,

Grischa

2 REPLIES 2

litrenta
Participant
Participant

This is because track group is configured wrong and it is getting checked on sync but not when entered (probably need to tighten up parser. instead of

track group MSFC-CSM-link

should be

track group 2

group should be hsrp group number not description of hsrp group .

see:

http://www.cisco.com/en/US/docs/interfaces_modules/services_modules/csm/4.2.x/configuration/guide/redun.html#wp1047936

Hi litrenta

Thanks for your reply. Unfortunately this is not the solution. I have tried "track group 2" (although Cisco IOS suggests not to do so) and this is the result:

Router1(config)#module ContentSwitchingModule 2

Router1(config-module-csm)# ft group 1 vlan 5

Router1(config-slb-ft)#no track group MSFC-CSM-link

Router1(config-slb-ft)#track group ?

  WORD  hsrp group name

Router1(config-slb-ft)#track group 2

% Please consider switching to HSRP group name instead of group number (track group 2)

Nevertheless I have configured it with group number instead of group name on both CSMs. BUT then according to "sh mod csm 2 ft detail" the tracked group 2 stays in state "init" without becoming active or standby on either side.

AND guess what? After config-sync the line "track group 2" vanished on standby CSM exactly like the one with the group name before.

So, no solution yet.

Further suggestions appreciated,

Grischa

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