User Manual

Configuring IP Interfaces and Parameters
142 Enterasys X-Pedition User Reference Manual
Configuring Address Resolution Protocol (ARP)
The XP allows you to configure Address Resolution Protocol (ARP) table entries and parameters.
ARP is used to associate IP addresses with media or MAC addresses. Taking an IP address as input,
ARP determines the associated MAC address. Once a media or MAC address is determined, the IP
address/media address association is stored in an ARP cache for rapid retrieval. Then the IP
datagram is encapsulated in a link-layer frame and sent over the network.
Configuring ARP Cache Entries
To create an ARP entry for the IP address 10.8.1.2 at port et.4.7 for 15 seconds:
To create a permanent ARP entry for the host nfs2 at port et.3.1:
To create a permanent ARP entry for IP address 10.8.1.25 that will always flood the traffic out the
subnet:
To remove the ARP entry for the host 10.8.1.2 from the ARP table:.
To clear the entire ARP table.
If the Startup configuration file contains arp add commands, the Control Module re-adds the ARP
entries even if you have cleared them using the arp clear command. To permanently remove an
ARP entry, use the negate command or no command to remove the entry.
Unresolved MAC Addresses for ARP Entries
When the XP receives a packet for a host whose MAC address it has not resolved, the XP tries to
resolve the next-hop MAC address by sending ARP requests. Five requests are sent initially for
each host, one every second.
xp# arp add 10.8.1.2 mac-addr 08:00:20:a2:f3:49 exit-port et.4.7 keep-time 15
xp(config)# arp add nfs2 mac-addr 080020:13a09f exit-port et.3.1
xp(config)# arp add 10.8.1.25 mac-addr 080020:a2f360 vlan
xp# arp clear 10.8.1.2
xp# arp clear all