Cisco N5K-M1600 - Expansion Module - 6 Ports Troubleshooting Manual page 91

Chapter 5 Troubleshooting SAN Switching Issues
S e n d d o c u m e n t c o m m e n t s t o n e x u s 5 k - d o c f e e d b a c k @ c i s c o . c o m .
Either use the debug fspf all command and look for wrong hello interval messages
Step 1
or check the last messages in the show logging command log for an error message.
The debug output generates the following messages:
fspf: Wrong hello interval for packet on interface 40000c7 in VSAN 200
fspf: Error in processing hello packet , error = Bad packet received
Use the undebug all command to turn off debugging.
Step 2
Open a second Telnet or SSH session before entering any debug commands. If the debug output
Tip
overwhelms the current session, you can use the second session to enter the undebug all command to
stop the debug message output.
Use the show fspf vsan <vsan-id> interface command to view the FSPF configuration on both switches.
Step 3
Example:
switch# show fspf vsan 200 interface port-channel 200
FSPF interface port-channel 200 in VSAN 200
FSPF routing administrative state is active
Interface cost is 125
Timer intervals configured, Hello 40 s, Dead 80 s, Retransmit 5 s
FSPF State is INIT
Statistics counters :
Number of packets received : LSU
Number of packets transmitted : LSU
Number of times inactivity timer expired for the interface = 0
switch# show fspf vsan 200 interface san-port-channel 200
FSPF interface san-port-channel 200 in VSAN 200
FSPF routing administrative state is active
Interface cost is 125
Timer intervals configured, Hello 20 s, Dead 80 s, Retransmit 5 s
FSPF State is INIT
Statistics counters :
Number of packets received : LSU
Number of packets transmitted : LSU
Number of times inactivity timer expired for the interface = 24
Note In the Example:
• The hello timer is not set to the default (20 seconds) on the first switch. Check the neighboring
switch (Nexus 5000) configuration to make sure it matches.
• FSPF is not in FULL state. This indicates a problem.
In the interface configuration mode, change the fspf hello-interval value to match the same values on
Step 4
both switches.
Example:
switch(config)# interface san-port-channel 200
switch(config-if)# fspf hello-interval 40 vsan 200
Verify that the FSPF is in FULL state after the change.
Step 5
OL-25300-01
3 LSA 3 Hello 136 Error packets 3
3 LSA 3 Hello 182
3 LSA 3 Hello 185 Error packets 169
3 LSA 3 Hello 139
Cisco Nexus 5000 Series Troubleshooting Guide
FC Services
Retransmitted LSU 0
Retransmitted LSU 0
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