Configuring multicast router discovery options

Configure the multicast router discovery options to enable the automatic discovery of multicast-capable routers.

About this task

Important

The switch does not support the Multicast Router Discovery (MRDISC) protocol on brouter ports.

Procedure

Enter VLAN Interface Configuration mode:

enable

configure terminal

interface vlan <1–4059>
Enable multicast router discovery:

ip igmp mrdisc
Configure the maximum advertisement intervals between successive advertisements:

ip igmp mrdisc maxadvertinterval <2–180> maxinitadvertinterval <2–180>
Configure the maximum advertisements after initialization:

ip igmp mrdisc maxinitadvertisements <2–15>
Configure the minimum advertisement interval between successive advertisements:

ip igmp mrdisc minadvertinterval <3–180>
Configure the time allowed before a neighbor is declared dead:

ip igmp mrdisc neighdeadinterval <2–180>

Example

Configure the maximum advertisement intervals between successive advertisements:

Switch:1(config-if)#ip igmp mrdisc maxadvertinterval 30 maxinitadvertinterval 5

Configure the maximum advertisements after initialization:

Switch:1(config-if)#ip igmp mrdisc maxinitadvertisements 8

Configure the minimum advertisement interval between successive advertisements:

Switch:1(config-if)#ip igmp mrdisc minadvertinterval 30

Configure the time allowed before a neighbor is declared dead:

Switch:1(config-if)#ip igmp mrdisc neighdeadinterval 60

Variable definitions

Use the data in the following table to use the ip igmp mrdisc command.


Variable	Value
maxadvertinterval `<2–180>`	Configures the maximum number (in seconds) between successive advertisements. For this change to take effect, you must save the configuration, and then reset the switch. To configure this option to the default value, use the default operator with the command. The default is 20.
maxinitadvertinterval <2–180>	Configures the maximum number (in seconds) between successive initial advertisements. For this change to take effect, you must save the configuration, and then reset the switch. To configure this option to the default value, use the default operator with the command. The default is 2.
maxinitadvertisements <2–15>	Configures the maximum number of initial multicast advertisements after initialization. For this change to take effect, you must save the configuration, and then reset the switch. To configure this option to the default value, use the default operator with the command. The default is 3.
minadvertinterval `<3–180>`	Configures the minimum number (in seconds) between successive advertisements. For this change to take effect, you must save the configuration, and then reset the switch. To configure this option to the default value, use the default operator with the command. The default is 15.
neighdeadinterval `<2–180>`	Configures the multicast router discovery dead interval—the number of seconds the multicast route neighbors for the switch must wait before assuming that the multicast router is down. To configure this option to the default value, use the default operator with the command. The default is 60.