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4-7
Cisco MDS 9000 Family Troubleshooting Guide
OL-5183-02, Cisco MDS SAN-OS Release 1.3
Chapter 4 Troubleshooting Switch Fabric Level Issues
Troubleshooting FSPF Issues
Loss of Two-way Communication
The following events occur when two-way communication is lost:
1. The Port enters Init state and removes its neighbor’s domain ID from the Recipient Domain ID field
and inserts 0xFFFFFFFF.
2. FSPF Removes the ISL (inter switch link) from the topology database.
3. New LSRs (Link State Records) are flooded to adjacent switches to notify them that the FSPF
database has changed.
Wrong Hello Interval on an ISL Interface
To identify a mismatch in the Hello interval on the two sides of an ISL interface, follow these steps:
Step 1 To turn on debugging, enter the following command:
switch1# debug fspf all
The system output looks like this:
switch1# debug fspf all
Jan 5 00:28:14 fspf: Wrong hello interval for packet on interface 100f000 in VSAN 1
Jan 5 00:28:14 fspf: Error in processing hello packet , error code = 4
Step 2 To show FSPF information, enter the following command:
switch1# show fspf internal route v 1
The system output looks like this:
switch1# show fspf internal route v 1
FSPF Unicast Routes
---------------------------
VSAN Number Dest Domain Route Cost Next hops
----------------------------------------------------------------------
1 0xEF(239) 1000 fc1/1 -----1
1 0xED(238) 2000 fc1/1
1 0x01(1) 3000 fc1/1 -----2
1. Indicates that there is no second path to Domain 238, through Domain 1 switch2.
2. Indicates that there is no direct path to Domain 1 switch2; traffic must travel through 3 ISLs.
Step 3 To view the currently configured FSPF parameters on the ISL, enter the following command:
switch1# show fspf v 1 interfac fc1/16
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 5 s, Dead 80 s, Retransmit 5 s -----1
FSPF State is INIT -----2
Statistics counters :
Number of packets received : LSU 0 LSA 0 Hello 2 Error packets 1
Number of packets transmitted : LSU 0 LSA 0 Hello 4 Retransmitted LSU 0
Number of times inactivity timer expired for the interface = 0
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