Fibre Channel (SAN)

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Occasional Contributor
Posts: 13
Registered: ‎12-02-2009

Merging Fabrics with the same Domain ID

I know that you're not suppose to have the same Domain ID for both fabrics when their merged...But what will happen if I configured two fabrics with the same Domain ID?

Will I get some sort of error message or indicator stating you can't merge because the Domain ID already exist on one fabric?

Super Contributor
Posts: 425
Registered: ‎03-03-2010

Re: Merging Fabrics with the same Domain ID

yes, you will get the message related to DID.

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

Re: Merging Fabrics with the same Domain ID

The fabric will get segmented, in simpler terms, the new switch or fabric with the duplicate id will not merge into the old fabric.

errshow –r
Fabric OS: v5.1.0c
2006/08/15-11:52:12, , 204,, WARNING,Techhelp24_B20, port 1, domain IDs overlap

You will find error messages in errshow -r which you can lookup in the message reference guide for your version of FOS. Some examples from the guide.

Hope this helps.

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FW-1117
Message <timestamp>, , <sequence-number>,, INFO, <system-name>, <Label>, value
has changed(High=<High value>, Low=<Low value>). Current value is <Value> <Unit>.
Probable Cause Indicates that the number of fabric reconfigurations has changed. The following actions can cause
a fabric reconfiguration:
• two switches with the same domain ID have connected to one another.
• two fabrics have joined.
• an E_Port has gone offline.
• a principal link has segmented from the fabric.
Recommended
Action
Verify that the cable is properly connected at both ends. Verify that the small form-factor
pluggables (SFPs) have not become faulty. An inexplicable fabric reconfiguration might be a
transient error and might not require troubleshooting.
Severity INFO

FW-1121
Message <timestamp>, , <sequence-number>,, INFO, <system-name>, <Label>, value
has changed(High=<High value>, Low=<Low value>). Current value is <Value> <Unit>.
Probable Cause Indicates that the number of domain ID changes has changed. Domain ID changes occur when
there is a conflict of domain IDs in a single fabric and the principal switch has to assign another
domain ID to the switch.
Recommended
Action
No action is required. Respond to this message as is appropriate to the particular policy of the
end-user installation.
Severity INFO

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Regards,

Biju Krishnan

bkrishnan@techhelp24.com

www.techhelp24.com

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