Troubleshooting Guide

Field Description
AUTH FAILURES Indicates the number of authentication failures.
NET_MASK MISMATCH Indicates the number of network mask mismatches this
interface receives.
HELLOINT MISMATCH Indicates the number of hello interval mismatches this interface
receives.
DEADINT MISMATCH Indicates the number of dead interval mismatches this interface
receives.
OPTION MISMATCH Indicates the number of options mismatches this interface
receives.
Viewing OSPF neighbor state problems
Before you begin
• You must log on to the Privileged EXEC mode in ACLI.
About this task
View the status of all the OSPF neighbors and their current adjacency state to determine if problems
occurred during the device initial startup sequence.
Problems with OSPF occur most often during the initial startup, when the device cannot form
adjacencies with other devices, and the state is stuck in the Init or ExStart/Exchange state.
Procedure
View the current state of all OSPF neighbors and their current state of adjacency:
show ip ospf neighbor
Example
VSP-4850GTS#show ip ospf neighbor
================================================================================
OSPF Neighbors - GlobalRouter
================================================================================
INTERFACE NBRROUTERID NBRIPADDR PRIO_STATE RTXQLEN PERM TTL
--------------------------------------------------------------------------------
42.1.1.33 198.95.65.0 42.1.1.34 1 Full 0 Dyn 40
Job aid
At initial startup, devices transmit hello packets in an attempt to find other OSPF devices with which
to form adjacencies. After the device receives the hello packets, it performs an initialization process,
which causes the device to transition through various states before it establishes the adjacency.
The following table describes the various device states during adjacency formation.
Viewing OSPF neighbor state problems
January 2017 Troubleshooting 257
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