HP ProCurve Series 6120 Blade Switches Multicast and Routing Guide

IP Routing Features
Overview of IP Routing
ARP Cache Table
The ARP cache contains entries that map IP addresses to MAC addresses.
Generally, the entries are for devices that are directly attached to the routing
switch.
An exception is an ARP entry for an interface-based static IP route that goes
to a destination that is one or more router hops away. For this type of entry,
the MAC address is the destination device’s MAC address.
ARP Cache. The ARP cache contains dynamic (learned) entries. The soft-
ware places a dynamic entry in the ARP cache when the routing switch learns
a device’s MAC address from an ARP request or ARP reply from the device.
There can be up to 4096 entries.
The software can learn an entry when the switch or routing switch receives
an ARP request from another IP forwarding device or an ARP reply. Here is
an example of a dynamic entry:
ProCurve(config)# show arp vlan 1
IP ARP table - DEFAULT_VLAN
IP Address MAC Address Type Port
------------ ------------- -------- ---
-
15.255.128.10 000000-000000 dynamic
15.255.133.222 001321-543235 dynamic 1
15.255.134.98 004562-0ef456 dynamic 1
15.255.123.43 00054e-0cb543 dynamic 2
Figure 3-1. Example of Output for show arp vlan Command
Each entry contains the destination device’s IP address and MAC address.
To configure other ARP parameters, see “Configuring ARP Parameters” on
page 3-14.
IP Route Table
The IP route table contains routing paths to IP destinations.
Note The default gateway, which you specify when you configure the basic IP
information on the switch, is used only when routing is not enabled on the
switch.
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