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.

 

 

N o t 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 software 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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