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Fibre Channel (SAN)

New Contributor
Posts: 4
Registered: ‎02-19-2010

When using EX_Port –> E_Port

Hi All

I need to know in what situation I may need to configure an ISL type EX –> E. 

I know that this EX-to-E port connection is used for Fabric Routing where you do not want two fabrics to merge together and that a normal E-to-E port connection allows the two fabrics to merge to form a single geographically distributed fabric.

But what I want to know is when I actually need to maintain two separate Fabric, despite having in communication between them.



External Moderator
Posts: 5,681
Registered: ‎02-23-2004

Re: When using EX_Port –> E_Port

if you set EX_Port to E_Port, the Fabric not merge.

in order to build communication beetwen both fabric you have usually a similarly design

Switch E_Port<-> IFL EX_Port <-> Integrated Routing Switch or FC Router <-> E_port <-> ISL <-> E_Port <-> Integrated Routing Switch or FC Router <-> IFL EX_Port <-> Switch E_Port

Frequent Contributor
Posts: 141
Registered: ‎05-26-2009

Re: When using EX_Port –> E_Port

There are a couple of scenarios. For example to route from one environment to another during a migration although the hardware or firmware or configuration of the both fabrics prevent a merge. Or imagine a long distance connection over a WAN using FCIP. IP is not as reliable as an FC SAN. So it makes sense to keep the both locations as 2 fabrics and just route between them. Interruptions of the IP connection in between won't cause fabric rebuilds.

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