All VSS link failed issue

[osw200051]

Hi All,

We have two Core in VSS connection (one active and one standby).

And each floor switch is connected to these two Core using ether-channel.

My problem is:

When some of the reason that all VSS link on the two Core had disconnected (Two Core become dual active), then, all the floor switch's link (ethechannel) connected to these two Core enter error-disable state. All floor service had down.

Any method to prevent this problem happened when all the VSS link failure for some of the reason???

Thanks

[Philip D'Ath]

If you want to be able to handle a single failure, then use two VSS links.  If you want to be able to handle double failures then you need 3 to 4 or everything.

[paul driver]

Hello

Yes I am aware of 3 options and the best one and most easiest to implement is Dual-active fast-hello method

Cisco VSS
VSS - netcraftsmen

Enhanced PAgP  ( require MECs between access switches to be PAgp aware) - will require re-configuration is the interconnects between the access switches dot not run Pagp

IP BFD -Bi-directional Forwarding Detection- -  requires direct L3 peering between vss switches but doesn't rely on PAgp on MECs

Dual-active fast-hello method - requires direct L2 peering between vss switches but doesn't rely on PAGP on MECs



res
Paul