Fibre Channel (SAN)

Occasional Contributor
Posts: 5
Registered: ‎04-26-2011

Question on ISL links, please?


I have two Brocade switches running "free standing", ie providing independent paths between storage and hosts. At present, the two switches do not "know" about each other.

My question is this: "What do I gain by adding one or more ISL links between the two switches?"

(eg performance, resilience, ease of zone mgmt ...)



Super Contributor
Posts: 635
Registered: ‎04-12-2010

Re: Question on ISL links, please?

You loose resillience,because you have a single zoning DB. Now you have two. In case of a single zoning error you will break the entire fabric/SAN.

You will not get more performance because you will have not more paths. I assume you have a proper zoning in place at both switches.

You will win at the zoning management point because you need only a single session. Currently you need two sessions in a dual fabric.

It is best practice to have two fabrics.

By the way. If you have 100% locality between server and storage ports you can not see any data traffic on the ISLs.

Which means that they are useless.

I hope this helps,


Join the Community

Get quick and easy access to valuable resource designed to help you manage your Brocade Network.

vADC is now Pulse Secure
Download FREE NVMe eBook