Resolving A Wrong Dead Interval Problem; Region Mismatch On Switch - Cisco MDS 9000 Series Troubleshooting Manual

Chapter 4 Troubleshooting Switch Fabric Level Issues
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 .
To enable the debug output for identifying this condition, enter the following command:
Step 1
switch1# debug fspf all
The system output looks like this:
switch1# debug fspf all
Jan
Jan
To display the currently configured FSPF parameters on the interface, enter the following command:
Step 2
switch1# show fspf v 1 interfac fc1/16
You should run this command on the local interface and on the switch at the other end of the ISL on
which the problem is occurring.
The system output looks like this:
switch1# show fspf v 1 interfac fc1/16
FSPF interface fc1/16 in VSAN 1
FSPF routing administrative state is active
Interface cost is 500
Timer intervals configured, Hello 20 s, Dead 95 s, Retransmit 5 s -----1
FSPF State is INIT -----2
x
Statistics counters :
Number of packets received : LSU
Number of packets transmitted : LSU
Number of times inactivity timer expired for the interface = 0
1.
2.

Resolving a Wrong Dead Interval Problem

The dead interval must match on both sides of the ISL, so to resolve this problem, change either side to
match the other. Note that under most conditions, the default dead interval value should be used unless
there is a demonstrated need to change it.
ML-88(config)# interface fc 1/16
ML-88(config-if)# fspf dead-interval XX vsan 1

Region Mismatch on Switch

To identify a region mismatch problem on a switch, follow these steps:
Step 1 To display the currently configured region in a VSAN, enter the following command:
switch# show fspf vsan 99
The system output looks like this:
FSPF routing for VSAN 99
FSPF routing administration status is enabled
FSPF routing operational status is UP
It is an intra-domain router
Autonomous region is 0
OL-5183-02, Cisco MDS SAN-OS Release 1.3
5 00:28:14 fspf: Wrong dead interval for packet on interface 100f000 in VSAN 1
5 00:28:14 fspf: Error in processing hello packet ,
Indicates that the dead timer is not set to the default, so you should check the neighbor configuration.
Indicates that FSPF is not in full state, which indicates a problem.
/* This is the region */
error code = 4
0 LSA 0 Hello 2 Error packets 1
0 LSA 0 Hello 4
Cisco MDS 9000 Family Troubleshooting Guide
Troubleshooting FSPF Issues
Retransmitted LSU 0
4-9