VSS dual-active condition query

[nileshrathi]

Hi All,

I am looking to implement VSS using our two 6500 series switches. The "Recovery Actions" when there is a Dual-Active situation says that the active chassis that detects a dual-active condition shuts down all of its non-VSL interfaces (except interfaces configured to be excluded from shutdown) to remove itself from the network, and waits in recovery mode until the VSL links have recovered. Does this mean that the Active chassis gets totally isolated thus triggering the modules on the Standby chassis to be active ?

Thanks.

Regards,

Nilesh

[Arumugam Muthaiah]

Hi Nilesh,

Yes, once the detection technique identifies the dual-active condition, the recovery phase begins.

In the examples The old-active switch triggers the recovery SW1 (original/old-active switch) detects that SW2 has now also become an active switch, which triggers detection of the dual-active condition. SW1 then disables all local interfaces (except loopback) to avoid network instability. SW1 also disables routing and STP instances. The old-active switch is completely removed from the network.

You can use the exclude interface option to keep a specified port operational during the dual-active recovery process-such as a designated management port.

Refer:

http://www.cisco.com/en/US/docs/solutions/Enterprise/Campus/VSS30dg/VSS-dg_ch4.html#wp1081394

Regards,

Aru

*** Please rate if the post is useful ***