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Checklist for Verifying the IP and IGP Layers

 

Problem

Description: This checklist provides the steps and commands for investigating a problem at the Internet Protocol (IP) and interior gateway protocol (IGP) layers of the layered Multiprotocol Label Switching (MPLS) model. The checklist provides links to an overview of the IP and IGP layers and more detailed information about the commands used to investigate the problem.

Solution

Table 1 provides commands for verifying the IP and IGP layers.

Table 1: Checklist for Verifying the IP and IGP Layers

Tasks

Command or Action

Verifying the IP and IGP Layers  
Verifying the IP Layer 
  1. Verify the LSP

show mpls lsp extensive

  1. Verify IP Addressing

show interfaces terse

  1. Verify Neighbors or Adjacencies at the IP Layer

show ospf neighbor extensive

show isis adjacency extensive

  1. Take Appropriate Action

The following sequence of commands addresses the specific problem described in this topic:

[edit interfaces so-0/0/2]

show

rename unit 0 family inet address 10.1.13.2/30 to address

     10.1.13.1/30

show

commit

  1. Verify the LSP Again

show mpls lsp extensive

Verifying the OSPF Protocol 
  1. Verify the LSP

show mpls lsp extensive

  1. Verify OSPF Interfaces

show ospf interface

  1. Verify OSPF Neighbors

show ospf neighbor

  1. Verifying an OSPF Configuration

show configuration protocols ospf

  1. Taking Appropriate Action for Resolving the Network Problem

The following sequence of commands addresses the specific problem described in this topic:

[edit]

edit protocols ospf area 0.0.0.0

[edit protocols ospf area 0.0.0.0]

set interface lo0

set interface lo0 passive

up

[edit protocols ospf]

set traffic-engineering

show

commit

  1. Verify the LSP Again

show mpls lsp extensive

Verifying the IS-IS Protocol 
  1. Verify the LSP

show mpls lsp extensive

  1. Verify IS-IS Adjacencies and Interfaces

show isis adjacency

show isis interface

  1. Verify the IS-IS Configuration

show configuration protocols isis

  1. Taking Appropriate Action for Resolving the Network Problem

The following sequence of commands addresses the specific problem described in this topic:

edit

[edit]

edit protocols isis

[edit protocols isis]

show

delete level 2

set level 1 disable

show

commit

run show isis adjacency

  1. Verify the LSP Again

show mpls lsp extensive