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Occasional Contributor
Posts: 17
Registered: ‎08-18-2009

Unplugging ISL's from 5100's

Our environment consists of two 4900's (domain id 1) creating two fabrics.  We are reaching capacity so we purchased two 5100's, and because we have never used ISL's before, we ISL'ed the two 5100's together (changing on of the domain id's to 2).

We now want to take away the ISL's from the 5100's and add them into the two fabrics, keeping the 4900's as domain ID 1's and the 5100's as domain id 2's.  I understand that I will need to disable the 5100 that I am changing the domain id from 1 to 2.

Are there any other gotcha's that I should worry about when we ISL a 4900 with a 5100?  Will I lose the alias, zones, or configuration information that is currently on the 5100's when they are connected with the 4900?

I hope I explained this well enough.

Super Contributor
Posts: 260
Registered: ‎04-09-2008

Re: Unplugging ISL's from 5100's

>> I understand that I will need to disable the 5100 that I am changing the domain id from 1 to 2.

I would also advice setting insistent domain id using the configure command. The speed should autonegotiate to 4 Gbps unless you have set fixed port speeds on ISL ports. All flow control parameters must be the same, and no need to worry unless you have changes defaults.

>> Will I lose the alias, zones, or configuration information that is currently on the 5100's when they are connected with the 4900?

There can be only one active zone config per fabric. Ideally you would create necessary zones on the 4900 and clear all zoning config on 5100 during the merge. The 5100's then can receive the zone info easily from the 4100.

Say if the 5100 fabric has

Zone A (ServerA, StorageA)

Zone B (ServerB, StorageB)

Recreate this on the 4100. On the day of migration, detach one 5100, run cfgclear on it and connect it to the 4100 using ISL's.

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