Brocade Troubleshooting and Diagnostics Guide v6.1.0 (53-1000853-01, June 2008)

Fabric OS Troubleshooting and Diagnostics Guide 61
53-1000853-01
Chapter
7
ISL Trunking Issues
This chapter describes symptoms and solutions to trunking problems as well as recommended
actions to take to correct trunking problems.
In this chapter
•Link issues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
•Buffer credit issues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Link issues
This section describes trunking link issues that can come up and recommended actions to take to
correct the problems.
Symptom A link that is part of an ISL trunk failed.
Probable cause and recommended action
Use the trunkDebug command to troubleshoot the problem, as shown in the following procedure.
1. Connect to the switch and log in as admin.
2. Enter the following command:
trunkDebug port, port
Example of a unformed E_Port
This example shows that port 3 is not configured as an E_Port:
brcdDCXbb:admin> trunkdebug 126, 127
port 126 is not E/EX port
port 127 is not E/EX port
Example of a formed E_Port
brcdDCXbb1:admin> trunkdebug 100, 101
port 100 and 101 connect to the switch 10:00:00:05:1e:34:02:45
The trunkDebug command displays the possible reason that two ports cannot be trunked. Possible
reasons are:
• The switch does not support trunking.
• A trunking license is required.
• Trunking is not supported in switch interoperability mode.
port Specifies the number of a port in an ISL Trunking group.