NEED VSS HELP

[Ayub]

Can we use two fast hello links between two chasis because i am going to put 4 links in vss from two modules (supervisor engine and uplink module) within a chasi to other same side supervisor and uplink modules? like I want to make one Fast hello from one side supervisor's with other side chasi supervisor and one fast hello between uplink module with other chasi uplink module ? can we achieve VSS like this ?  and Fast Hello?

Let me more clear for you

In each chasi i have one C6807-XL-S2T-BUN -  two WS-X6824-SFP-2T - and one C6800-8P10G.

Right Now my VSL is configured between two C6800-8P10G on both chasis and Fast hello is configured on C6807-XL-S2T-BUN on same both sides.

What I want to achieve is in an attachment. is this possible?

[Reza Sharifi]

There is no need for 2 fast hello links. You only need one link for dual-active detection.

HTH

[Ayub]

Thanks Reza for the reply. What about the rest of the topology ? i will be good with it ?

[Reza Sharifi]

Sure. For VSL link, you only need 2 (one from a module and one from the Sup) especially since you are using 10Gig links.

HTH

[Ayub]

Thanks Reza, i will give a try for this. Other thing i need to clarify is, i know i need only one Hello link but what if i can use two Hello links as mention in the topology. Is it not good incase one of my Hello Link goes down?

[Reza Sharifi]

The fast hello link applies between chassis and you only need a 1Gig connection. Having 2 links will cause confusion and you may not detect when there is a dual-active situation.

So, one 1Gig link (copper or fiber) for fast-hello and 2 10gig links for VSL.

HTH

[Ayub]

Thanks Reza as you are helping me alot i have one more question hopefully last one, As my VSL is up and running now i have been told to add additional link from other module into VSL (etherchannel) on both sides. Shall i add just that additional link into same port-channel on each chasi or i have to follow some other best practices to add additional link into running VSS link ?