Configuring Router Discovery on a port or VLAN

Enable Router Discovery so that the device forwards Router Discovery Advertisement packets to the VLAN or port.

Procedure

Enter Interface Configuration mode:

enable

configure terminal

interface GigabitEthernet {slot/port[/sub-port][-slot/port[/sub-port]][,...]} or interface vlan <1–4059>

Note

If the platform supports channelization and the port is channelized, you must also specify the sub-port in the format slot/port/sub-port.
Specify the address placed in advertisement packets:

ip irdp address <A.B.C.D>
Enable the interface to send the advertisement packets:

ip irdp multicast
Configure other Router Discovery parameters for the interface as required.

Log on to the GigabitEthernet Interface mode:

Switch:1> enable
Switch:1# configure terminal
Switch:1(config)# interface gigabitethernet 1/16

Specify the address placed in advertisement packets to the all-systems multicast address:

Switch:1(config-if)# ip irdp address 244.0.0.1

Enable the interface to send the advertisement packets:

Switch:1(config-if)# ip irdp multicast

Configure the lifetime for advertisements:

Switch:1(config-if)# ip irdp holdtime 180

Use the data in the following table to use the ip irdp command.

Table 1. Variable definitions
Variable	Value
address <A.B.C.D>	Specifies the IP destination address use for broadcast or multicast router advertisements sent from the interface. The address is the all-systems multicast address, 224.0.0.1, or the limited-broadcast address, 255.255.255.255. The default address is 255.255.255.255. The default form of this command is `default ip irdp address`.
holdtime <4-9000>	Configures the lifetime for advertisements. The default form of this command is `default ip irdp holdtime`.
maxadvertinterval <4-1800>	Specifies the maximum time (in seconds) that elapses between unsolicited router advertisement transmissions from the router interface. The default is 600 seconds. The default form of this command is `default ip irdp maxadvertinterval`.
minadvertinterval <3-1800>	Specifies the minimum time (in seconds) that elapses between unsolicited router advertisement transmissions from the interface. The range is 3 seconds to maxadvertinterval. The default is 450 seconds. The default form of this command is `default ip irdp minadvertinterval`.
multicast	Specifies if multicast advertisements are sent. The no form of this command is `no ip irdp multicast`.
preference <-2147483648-2147483647>	Specifies the preference (a higher number indicates more preferred) of the address as a default router address relative to other router addresses on the same subnet The default is 0. The default form of this command is `default ip irdp preference`.