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11-18
Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x
OL-9285-05
Chapter 11 Troubleshooting VSANs, Domains, and FSPF
Domain Issues
Two switch fabrics might not merge. If two fabrics with two or more switches are connected, and they
have at least one assigned domain ID in common, and the auto-reconfigure option is disabled (this option
is disabled by default), then the E ports that are used to connect the two fabrics will be isolated due to
domain ID overlap.
Switch Cannot See Other Switches in a VSAN
Symptom Switch cannot see other switches in a VSAN.
FC Domain ID Overlap
To resolve an FC domain ID overlap, you can either change the overlapping static domain ID by
manually configuring a new static domain ID for the isolated switch, or disable the static domain
assignment and allow the switch to request a new domain ID after a fabric reconfiguration.
• To assign a static domain ID, see the “Assigning a New Domain ID Using Fabric Manager” section
on page 11-19 or the “Assigning a New Domain ID Using the CLI” section on page 11-19.
• To assign a dynamic domain ID after a fabric reconfiguration, see the “Using Fabric Reconfiguration
for Domain ID Assignments” section on page 11-20.
You may see the following system message in the message log when a domain ID overlap occurs:
Error Message PORT-5-IF_DOWN_DOMAIN_OVERLAP_ISOLATION: Interface [chars] is down
(Isolation due to domain overlap).
Explanation
The interface is isolated because of a domain overlap.
Recommended Action Use the show fcdomain domain-list to determine which domain IDs are
overlapping. Use the fcdomain domain domain-id [static | preferred] vsan vsan-id CLI command
or similar Fabric Manager procedure to change the domain ID for one of the overlapping domain
IDs.
Table 11-13 Switch Cannot See Other Switches in a VSAN
Symptom Possible Cause Solution
Switch cannot see
other switches in a
VSAN.
Switch is isolated because of a domain
ID overlap.
Either change the overlapping static domain ID by
manually configuring a new static domain ID for the
isolated switch, or disable the static domain assignment
and allow the switch to request a new domain ID after a
fabric reconfiguration.
See the “FC Domain ID Overlap” section on page 11-18.
Fabric timers are misconfigured. See the “Resolving Fabric Timer Issues Using Fabric
Manager” section on page 11-9 or the “Resolving Fabric
Timer Issues Using the CLI” section on page 11-9.
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