IP Routing Features

Configuring IRDP

messages from other routers at the same time. The interval on each IRDP- enabled routing switch interface is independent of the interval on other IRDP-enabled interfaces. The default maximum message interval is 600 seconds. The default minimum message interval is 450 seconds.

Preference - If a host receives multiple Router Advertisement messages from different routers, the host selects the router that send the message with the highest preference as the default gateway. The preference can be a number from -4294967296 to 4294967295. The default is 0.

Enabling IRDP Globally

To enable IRDP globally, enter the following command:

HP(config)# ip irdp

This command enables IRDP on the IP interfaces on all ports. Each port uses the default values for the IRDP parameters.

Enabling IRDP on an Individual VLAN Interface

To enable IRDP on an individual VLAN interface and configure IRDP param­ eters, enter commands such as the following:

HP(config)# vlan 1

HP(vlan-1)# ip irdp maxadvertinterval 400

This example shows how to enable IRDP on a specific interface (VLAN 1) and change the maximum advertisement interval for Router Advertisement messages to 400 seconds.

Syntax: [no] ip irdp [broadcast multicast] [holdtime <seconds>] [maxadvertint­ erval <seconds>] [minadvertinterval <seconds>] [preference <number>]

broadcast multicast - This parameter specifies the packet type the routing switch uses to send the Router Advertisement.

broadcast - The routing switch sends Router Advertisements as IP broadcasts.

multicast - The routing switch sends Router Advertisements as multi- cast packets addressed to IP multicast group 224.0.0.1. This is the default.

holdtime <seconds> - This parameter specifies how long a host that receives a Router Advertisement from the routing switch should consider the advertisement to be valid. When a host receives a new Router Adver­ tisement message from the routing switch, the host resets the hold time

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