03-Layer 3-IP Services Configuration Guide

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07-Adjacency table configuration
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Displaying the adjacency table

About the adjacency table

The adjacency table stores information about directly connected neighbors for IP forwarding. The neighbor information in this chapter refers to non-Ethernet neighbor information.

This table is not user configurable. The neighbor information is generated, updated, and deleted by link layer protocols through negotiation or through manual configuration (such as ATM static configuration).

An adjacency entry includes the following information:

·     Neighbor network layer address (next hop).

·     Output interface.

·     Link layer protocol type.

·     Link layer address.

When forwarding an IP packet, the device performs the following tasks:

·     Searches the FIB to find the output interface and next hop.

·     Uses the output interface and next hop address to search the adjacency table for link layer forwarding information. The link layer forwarding information includes link layer protocol (such as HDLC), media type (such as P2P and NBMA), and link layer header.

 

 

NOTE:

Ethernet and non-Ethernet neighbor information is stored and managed together.

 

Display and maintenance commands for adjacency table

Execute display commands in any view.

 

Task

Command

Display IPv4 adjacency table information.

display adjacent-table { all | physical-interface interface-type interface-number | routing-interface interface-type interface-number | slot slot-number } [ count | verbose ]

Display IPv6 adjacency table information.

display ipv6 adjacent-table { all | physical-interface interface-type interface-number | routing-interface interface-type interface-number | slot slot-number } [ count | verbose ]

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