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New Contributor
Posts: 2
Registered: ‎02-23-2016
Accepted Solution

Clarification: "Circular" ISL between three switches

Hi,

 

our situation is:

- Three switches A,B, C

- ISL connections: A <--> B <--> C

- Hosts on swicthes A, B and C

- Storage is attached to switches A and B only

 

When switch B fails, the hosts on switch C have no more access to storage. Are there any reasons to NOT create another ISL between switches A and C? AFAIK, FSPF will take care of the routing without any problems, and as all of the switches are part of one fabric already anyway, there should be no incompatibilities.

 

Contributor
Posts: 66
Registered: ‎12-24-2015

Re: Clarification: "Circular" ISL between three switches

[ Edited ]

Hi,

You can make as many isls as you want.

But you must remember about portbuffers limitations, look at best practice isl configuration.

 

But, the best practice of commutation switches in the same fabric is full-mesh schema.

 

It's look like:

 

              A

            /  |  \

          B --- C

            \  |  /

              D

 

In you case:

 

              A

            /    \

          B --- C

 

New Contributor
Posts: 2
Registered: ‎02-23-2016

Re: Clarification: "Circular" ISL between three switches

Thank you!

Valued Contributor
Posts: 524
Registered: ‎03-20-2011

Re: Clarification: "Circular" ISL between three switches

I vote for triangle as well.

In case with four switches above, the full mesh is incomplete without the link between A and D.
Contributor
Posts: 66
Registered: ‎12-24-2015

Re: Clarification: "Circular" ISL between three switches

That's right.

I notice my mistake, but haven't free time to correct it.

I try to do it now.

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