SG0-001 · Question #158
There are two FC switches in an ISL configuration, and the fabric has a segmented fabric error. Which of the following is the MOST likely cause?
The correct answer is D. Domain IDs are not unique on each FC switch. A segmented Fibre Channel fabric error, particularly when switches are connected via ISLs, is most commonly caused by non-unique Fibre Channel Domain IDs. Each switch in an FC fabric must have a distinct Domain ID to merge and operate as a single logical entity.
Question
There are two FC switches in an ISL configuration, and the fabric has a segmented fabric error. Which of the following is the MOST likely cause?
Options
- AFC switch IP addresses are the same on each switch
- BFC switch names are the same on each switch.
- CFC switch FWs are different on each switch.
- DDomain IDs are not unique on each FC switch
How the community answered
(40 responses)- A8% (3)
- B5% (2)
- C15% (6)
- D73% (29)
Why each option
A segmented Fibre Channel fabric error, particularly when switches are connected via ISLs, is most commonly caused by non-unique Fibre Channel Domain IDs. Each switch in an FC fabric must have a distinct Domain ID to merge and operate as a single logical entity.
FC switch IP addresses are used for out-of-band management and do not impact the Fibre Channel data plane or fabric formation.
FC switch names are for administrative identification and do not play a role in the fabric's logical structure or cause segmentation if duplicated.
While different FC switch firmware versions can lead to feature incompatibilities, they are not the most direct or common cause of a fundamental "segmented fabric error" compared to conflicting Domain IDs.
In a Fibre Channel fabric, each switch must be assigned a unique Domain ID; if two switches connected via an ISL have the same Domain ID, they cannot merge into a single fabric, resulting in a segmented fabric error. The Fabric OS detects this conflict and prevents the fabric from forming correctly.
Concept tested: Fibre Channel Domain ID conflicts
Source: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/mds9000/sw/6_2/troubleshooting/trgd/MDS_SAN_TRBLSHOOTING_V62/mds_fctrb.html#pgfId-1002341
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