3Com 3500 - Manual (Page 428)

428 C HAPTER 16: I NTERNET P ROTOCOL (IP)
✓ 3500
✓ 9000
✓ 9400
✓
3900
✓
9300
ip arp display 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