Brocade Network OS Administrator’s Guide v4.1.1 - Manual (Page 686)

• LLDP is not reporting its neighbors. Refer to Verifying LLDP on page 688.
• An overloaded CPU fails to generate keepalive packets. Refer to Checking for CPU overload on
page 688.
Verifying the status of ISLs
If any port looks suspicious, begin by checking the status of ISLs.
1. On the switches at each end of the broken link, in privileged EXEC mode, enter the show fabric isl
command to view the status of ISL connections.
switch1# show fabric isl
Rbridge-id: 2 #ISLs: 2
Src Src Nbr Nbr
Index Interface Index Interface Nbr-WWN BW Trunk Nbr-Name
-------------------------------------------------------------------------------
1 Te 2/0/1 1 Te 3/0/1 10:00:00:05:1E:CD:7A:7A 10G Yes "switch1"
2 Te 2/0/2 ? Te ?/?/? ??:??:??:??:??:??:??:?? (segmented - incompatible)
26 Te 2/0/26 56 Te 25/0/56 10:00:00:05:33:40:2F:C9 60G Yes "Edget12r31_25"
34 Te 2/0/34 58 Te 26/0/58 10:00:00:05:33:41:1E:B7 40G Yes "Edget12r32_26"
Ports on which the ISL link is broken appear with the text "(segmented - incompatible)." Ports for
which the ISL configuration is disabled do not appear in the output.
2. Enter the show fabric islports command to gather more information about the status of suspect
ports.
switch# show fabric islports
Name: switch
Type: 107.4
State: Online
Role: Fabric Subordinate
VCS Id: 10
Config Mode: Local-Only
Rbridge-id: 11
WWN: 10:00:00:05:33:6d:7f:77
FCF MAC: 00:05:33:6d:7f:77
Index Interface State Operational State
===============================================================
1 Te 11/0/1 Up ISL 10:00:00:05:33:00:77:80 "switch" (upstream)(Trunk Primary)
2 Te 11/0/2 Down
3 Te 11/0/3 Down
4 Te 11/0/4 Up ISL (Trunk port, Primary is Te 11/0/1)
5 Te 11/0/5 Down
6 Te 11/0/6 Down
7 Te 11/0/7 Down
8 Te 11/0/8 Down
9 Te 11/0/9 Down
10 Te 11/0/10 Down
11 Te 11/0/11 Up ISL 10:00:00:05:1e:00:50:00 "switch" (Trunk Primary)
121 Fi 11/0/1 Up LS ISL 50:00:53:37:b6:93:5e:02 "fcr_fd_160"(downstream)(Trunk Primary)
122 Fi 11/0/2 Up LS ISL (Trunk port, Primary is Fi 11/0/1)
123 Fi 11/0/3 Down
124 Fi 11/0/4 Down
125 Fi 11/0/5 Down
126 Fi 11/0/6 Down
127 Fi 11/0/7 Down
3. If the port state is "Down," enable the port with the no shutdown command.
switch# configure terminal
Entering configuration mode terminal
switch(config)# interface tengigabitethernet 178/0/9
switch(conf-if-te-178/0/9)# no shutdown
4. If the port state is "Up", but the ISL is segmented, examine the Operational State string for further
clues to the reason for the segmentation.
Refer to the Network OS Command Reference for details about the show fabric islports command
and help in interpreting the Operational State string for a segmented ISL.
Verifying the status of ISLs
686 Network OS Administrator’s Guide
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