Cisco MDS-9124 Troubleshooting Guide - Page 238
Switch Cannot See Other Switches in a VSAN, FC Domain ID Overlap
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Domain Issues Chapter 11 Troubleshooting VSANs, Domains, and FSPF Send documentation comments to [email protected] 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. Table 11-13 Switch Cannot See Other Switches in a VSAN Symptom Switch cannot see other switches in a VSAN. Possible Cause Solution 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. 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. 11-18 Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x OL-9285-05