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IP Routing Features
Overview of IP Routing
Each IP address on a routing switch must be in a different sub-net. You can
have only one VLAN interface that is in a given sub-net. For example, you can
configure IP addresses 192.168.1.1/24 and 192.168.2.1/24 on the same routing
switch, but you cannot configure 192.168.1.1/24 and 192.168.1.2/24 on the same
routing switch.
You can configure multiple IP addresses on the same VLAN.
The number of IP addresses you can configure on an individual VLAN interface
is 8.
You can use any of the IP addresses you configure on the routing switch for
Telnet, Web management, or SNMP access, as well as for routing.
Not e All HP Procurve devices support configuration and display of IP address in
classical sub-net format (example: 192.168.1.1 255.255.255.0) and Classless
Interdomain Routing (CIDR) format (example: 192.168.1.1/24). You can use
either format when configuring IP address information. IP addresses are
displayed in classical sub-net format only.
IP Tables and Caches
The following sections describe the IP tables and caches:
ARP cache table
IP route table
IP forwarding cache
The software enables you to display these tables.
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 either the destination device’s MAC address or the MAC
address of the router interface that answered an ARP request on behalf of the
device, using proxy ARP.
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.
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