Troubleshooting Steps; Troubleshoot Switch And Port Parameters - Cisco MDS 9000 Series Troubleshooting Manual

Chapter 3 Troubleshooting Switch Level Issues and Interswitch Connectivity
S e n d c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m .

Troubleshooting steps

The first step in the process is to understand the nature of the problem by checking the status of the
E port. The show interface command can be used to display the port status. This command is very useful
in troubleshooting switch connectivity issues. In case of error, this command provides indication of the
protocol error or configuration mismatch that caused the problem, between parenthesis, immediately
after the port operational status.
Sample output#3
switch# show interface fc4/1
fc4/1 is up
When the port operational status shows that the port is up, it means that the E port is up and is currently
passing traffic. The output shown above represents the output of a working E port.
Different types of isolation problems can be recognized by running the show interface command:
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Troubleshoot Switch and Port Parameters

One of the possible causes for E port isolation is a mismatch in the configured switch or port parameters.
The problem will affect the link initialization process, and eventually the initial ELP exchange. An
example of the expected show interface command output is shown below:
switch# show interface fc2/4
fc2/4 is down (Isolation due to ELP failure)
OL-5183-02, Cisco MDS SAN-OS Release 1.3
Hardware is Fibre Channel
Port WWN is 20:c1:00:05:30:00:13:9e
Peer port WWN is 21:89:00:05:30:00:18:a2
Admin port mode is auto, trunk mode is on
Port mode is E, FCID is 0x6b0000
Port vsan is 1
Speed is 2 Gbps
Receive B2B Credit is 12
Receive Buffer Size is 2112
Encapsulation is normal
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
109 frames input, 9728 bytes, 0 discards
0 CRC, 0 unknown class
0 too long, 0 too short
108 frames output, 6652 bytes, 0 discards
1 input OLS, 3 LRR, 1 NOS, 2 loop inits
4 output OLS, 3 LRR, 3 NOS, 0 loop inits
Isolation due to ELP failure and mismatch in the switch or port parameters
Isolation due to zone merge failure
Isolation due to port/VSAN mismatch
Isolation due to domain overlap
Isolation due to invalid fabric reconfiguration
Hardware is Fibre Channel, WWN is 20:44:00:05:30:00:18:a2
vsan is 1
Beacon is turned off
1445517676 packets input, 727667035658 bytes, 0 discards
0 input errors, 0 CRC, 0 invalid transmission words
0 address id, 0 delimiter
Troubleshooting E Port Connectivity - ISL Isolation
Cisco MDS 9000 Family Troubleshooting Guide
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