09-21-2012 06:19 AM
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.
09-21-2012 10:28 AM
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
09-21-2012 03:03 PM
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.