428CHAPTER 16: INTERNET PROTOCOL (IP)

ip arp display

3500

9000

9400

3900

9300

For CoreBuilder 9000: Applies to Layer 3 switching modules only.

Displays the contents of the Address Resolution Protocol (ARP) cache for each interface on the system.

Valid Minimum Abbreviation

ip ar d

Important Considerations

The system uses the ARP cache to find the MAC addresses that correspond to the IP addresses of hosts and other routers on the same subnetworks. Each device that participates in routing maintains an ARP cache, which is a table of known IP addresses and their corresponding MAC addresses.

The first line in the output (the status line) indicates whether IP routing is enabled:

For the CoreBuilder 9000 Layer 3 module, it also indicates whether Internet Control Message Protocol (ICMP) router discovery is enabled on the system.

For the CoreBuilder 3500, IP interface options (such as ICMP router discovery) appear under “ip interface detail” earlier in this chapter and are set on a per-interface basis. The second status line indicates the number of entries in the ARP cache.

Fields in the IP ARP Display

Field

Description

 

 

Circuit

Circuit identifier

Hardware address

MAC address that is mapped to the IP address

I/F

Index number of the associated interface

IP address

IP address of the interface

Type

Type of entry — static or dynamic

 

 

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3Com 3500 manual Ip arp display, Fields in the IP ARP Display