Fibre Channel (SAN)

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New Contributor
Posts: 3
Registered: ‎12-16-2016

ISL

[ Edited ]

Hi, I have a scenario where I could use a peer review.

 

We have three FC switches in our environment, they are ISL'd as shown below.

 

Switch 1 <-> ISL <-> Switch 2 <-> ISL <-> Switch 3.

 

The plan is to retire switch 2, however its ISL link to switch 3 is still required because there are hosts attached to Switch 1 which need to access a storage array connected to switch 3.

 

With all three switches in its current state, is it possible to establish an ISL between Switch 1 and Switch 3?  All switches have the same zoning configuration.  I have a escalation support case opened, however I was also hoping to leverage some of the other SAN Admin's experience out there to see if anyone has come across this scenario.

 

Thank you

Brocade Moderator
Posts: 63
Registered: ‎04-27-2009

Re: ISL

Hi,

 

yes, you just need to add ISLs between switch 1 and switch 3. Triangular design is pretty common.

 

Once you enable the first ISL between switch 1 and switch 3 all the traffic between devices on these two domains will be all rerouted to the new ISL(s) only due to lower link cost / hop count / FSPF (Fabric Shortest Path First).

 

TL

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