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Ip Routing Features; Overview; Ip Interfaces; Ip Tables And Caches - HP 2920 Series Multicast And Routing Manual

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3 IP Routing Features


The switch offers the following IP routing features:
IP Static routes
RIP (Router Information Protocol)
IRDP (ICMP Router Discovery Protocol)
DHCP Relay
Throughout this chapter, the switches are referred to as "routing switches." When IP routing is
enabled on your switch, it behaves just like any other IP router.
Basic IP routing configuration consists of adding IP addresses, enabling IP routing, and enabling
a route exchange protocol, such as RIP.
For configuring the IP addresses, see the chapter "Configuring IP Addresses" in the Management
and Configuration Guide for your switch. Use the information in this chapter if you need to change
some of the IP parameters from their default values or if you want to view configuration information
or statistics.

IP interfaces

On the routing switches, IP addresses are associated with individual VLANs. By default, there is
a single VLAN (Default_VLAN) on the routing switch. In that configuration, a single IP address
serves as the management access address for the entire device. If routing is enabled on the routing
switch, the IP address on the single VLAN also acts as the routing interface.
Each IP address on a routing switch must be in a different subnet. You can have only one VLAN
interface in a given subnet. For example, you can configure IP addresses and on the same routing switch, but you cannot configure and 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 32.
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.
All HP devices support configuration and display of IP address in classical subnet format
(example: and Classless Interdomain Routing (CIDR) format (example: You can use either format when configuring IP address information. IP addresses
are displayed in classical subnet format only.

IP tables and caches

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 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
IP Routing Features
Up to 256 static routes
Supports RIP Version 1, Version 1 compatible with Version 2 (default),
and Version 2
Advertises the IP addresses of the routing interfaces on this switch to
directly attached host systems
Allows you to extend the service range of your DHCP server beyond its
single local network segment


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