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3-9
Cisco MDS 9000 Family Troubleshooting Guide
OL-5183-02, Cisco MDS SAN-OS Release 1.3
Chapter 3 Troubleshooting Switch Level Issues and Interswitch Connectivity
Troubleshooting E Port Connectivity - ISL Isolation
Beacon is turned off
5 minutes input rate 16 bits/sec, 2 bytes/sec, 0 frames/sec
5 minutes output rate 0 bits/sec, 0 bytes/sec, 0 frames/sec
342 frames input, 9492 bytes, 199 discards
0 CRC, 0 unknown class
0 too long, 0 too short
143 frames output, 4184 bytes, 0 discards
2 input OLS, 4 LRR, 2 NOS, 12 loop inits
6 output OLS, 2 LRR, 5 NOS, 1 loop inits
switch#
If the overlapping domain IDs are statically assigned, or you want to manually assign the new domain
IDs, it would be necessary to go into the switch with the overlapping domain ID, configure a new domain
ID for that switch, and restart the domain manager process to merge the two fabrics. To configure a
domain ID on the switch use the following command. Domain IDs are assigned on a per-VSAN basis.
switch(config)# fcdomain domain 3 preferred vsan 1
switch(config)# fcdomain domain 3 static vsan 1
switch(config)#
When configuring a domain ID on a switch, there are two options - static and preferred. The static option
tells the switch to request that particular domain in the fabric. If it does get that particular address, it will
isolate itself from the fabric. With the preferred option, the switch requests the domain ID, but if that ID
is not available it will accept another ID. After configuring the domain ID it is necessary to restart the
domain manager to merge the two fabrics.
switch# config t
Enter configuration commands, one per line. End with CNTL/Z.
switch(config)# fcdomain restart vsan 1
switch(config)#
If a switch cannot get a statically configured address it would isolate itself from the fabric. When it
isolates itself the show interface output is the following.
switch# show interface fc2/14
fc2/14 is down (isolation due to domain overlap )
Hardware is Fibre Channel, WWN is 20:4e:00:05:30:00:63:9e
vsan is 2
Beacon is turned off
192 frames input, 3986 bytes, 0 discards
0 runts, 0 jabber, 0 too long, 0 too short
0 input errors, 0 CRC, 3 invalid transmission words
0 address id, 0 delimiter
0 EOF abort, 0 fragmented, 0 unknown class
231 frames output, 3709 bytes, 16777216 discards
Received 28 OLS, 19 LRR, 16 NOS, 48 loop inits
Transmitted 62 OLS, 22 LRR, 25 NOS, 30 loop inits
While of the neighbor switch E port the message would be the following
switch2# show interface fc9/4
fc9/4 is down (Isolation due to domain other side eport isolated)
Hardware is Fibre Channel
Port WWN is 22:04:00:05:30:00:13:9e
Admin port mode is auto, trunk mode is off
Port vsan is 1
Receive data field size is 2112
Beacon is turned off
5 minutes input rate 0 bits/sec, 0 bytes/sec, 0 frames/sec
5 minutes output rate 0 bits/sec, 0 bytes/sec, 0 frames/sec
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