Displaying The Adjacency Table - H3C MSR 2600 Configuration Manual

Displaying the adjacency table

The adjacency table stores information about directly connected neighbors for IP forwarding. The
neighbor information in the adjacency table 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 (such as PPP dynamic negotiation) or through manual configuration
(such as ATM static configuration). An adjacency entry contains the neighbor network layer address
(next hop), output interface, link layer protocol type, and link layer address (PVC for ATM, unavailable
for PPP).
When forwarding an IP packet, the device searches the FIB to find the output interface and next hop, and
then uses the output interface and next hop address to search the adjacency table for link layer
forwarding information that is required for forwarding the packet.
NOTE:
Ethernet neighbor information and non-Ethernet neighbor information are stored and managed together.
The following table shows the items contained in an adjacency table output:
Item
IP address
Routing interface
Physical interface
Logical interface
Service type
Action type
Link media type
Link head information(IP)
Link head information(IPv6)
Link head information(MPLS)
To display adjacency table entries, use one of the following commands as appropriate in any view:
Task
Display IPv4 adjacency table
information.
Description
IP address of the next hop in FIB table for packet forwarding. This address is
used for adjacency table lookup.
Output interface in the matching route entry. This interface is used for
adjacency table lookup, and it can be logical or physical.
Output physical interface that sends matching packets. If the routing interface
is physical, the routing interface and physical interface are the same. If the
routing interface is logical, the routing interface and physical interface are
different.
Logical interface for sending packets, such as a virtual-Ethernet interface for
ATM, or a Virtual-Template interface for MP.
Link layer protocol type, such as PPP or HDLC.
Action to be taken on the matching packet: Forwarding or Drop.
Related to the link layer protocol used by the routing interface. P2P indicates
a point-to-point link and NBMA indicates a non-broadcast multi-access link.
Link layer header for IP forwarding.
Link layer header for IPv6 forwarding.
Link layer header for MPLS forwarding.
Command
display adjacent-table { all | physical-interface interface-type
interface-number | routing-interface interface-type
interface-number | slot slot-number } [ count | verbose ]
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