04-13-2010 11:55 AM
Hi there,
I'm currently in the process of migrating from CSS to CSM and I have a question regarding TCP state tracking between two CSM's. In the documentation it says the the connection information is sent over to the secondary CSM using a multicast frame and that you must disable IGMP snooping for it to work properly. I plan on utilizing multicast services off of the same 6500's the CSM's are installed and I'm wondering if disabling IGMP snooping will have a negative impact. Can anyone comment?
Thanks in advance,
Brandon
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04-14-2010 11:12 AM
Hi Brandon,
If you disable IGMP snooping globally, I would imagine it would cause problems. However, you can disable IGMP snooping on a per-IP interface basis. If you execute the command "no ip igmp snooping" from within the submode "interface vlan
It is recommended that this is the only command used in the FT VLAN interface. Don't assign an IP address to the FT VLAN interface or execute any other configuration command other than "no ip igmp snooping" on the FT VLAN interface. We intend the FT VLAN only to carry the CSM's specialized connection redundancy frames. It should not be used for any other purpose.
Hope this helps,
Sean
04-14-2010 11:12 AM
Hi Brandon,
If you disable IGMP snooping globally, I would imagine it would cause problems. However, you can disable IGMP snooping on a per-IP interface basis. If you execute the command "no ip igmp snooping" from within the submode "interface vlan
It is recommended that this is the only command used in the FT VLAN interface. Don't assign an IP address to the FT VLAN interface or execute any other configuration command other than "no ip igmp snooping" on the FT VLAN interface. We intend the FT VLAN only to carry the CSM's specialized connection redundancy frames. It should not be used for any other purpose.
Hope this helps,
Sean
07-04-2011 05:44 AM
Hi Sean,
before deactivating igmp snooping the ft-vlan interface does not exist in the configuration.
After configuring the "no ip igmp snooping" command the interface it's still in shutdown state:
===
interface Vlan700
no ip address
no ip igmp snooping
shutdown
end
===
Is this the correct final configuration?
Best Regards
Thorsten
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