Specifications

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Appendix B Cisco MWR 2941 Router Command Reference

mdt default

To configure a default multicast distribution tree (MDT) group for a Virtual Private Network (VPN)

routing and forwarding (VRF) instance, use the mdt default command in VRF configuration mode. To

disable this function, use the no form of this command.

mdt default group-address

no mdt default group-address

Syntax Description

Command Default The command is disabled.

Command Modes VRF configuration

Command History

Usage Guidelines The default MDT group must be the same group configured on all PE routers that belong to the same

VPN.

If Source Specific Multicast (SSM) is used as the protocol for the default MDT, the source IP address is

the address used to source the Border Gateway Protocol (BGP) sessions.

A tunnel interface is created as a result of this command. By default, the destination address of the tunnel

header is the group-address argument.

Examples In the following example, Protocol Independent Multicast (PIM) SSM is configured in the backbone.

Therefore, the default and data MDT groups are configured within the SSM range of IP addresses. Inside

the VPN, PIM sparse mode (PIM-SM) is configured and only Auto-RP announcements are accepted.

ip vrf vrf1

rd 1:1

group-address IP address of the default MDT group. This address serves as an identifier

for the community in that provider-edge (PE) routers configured with

the same group address become members of the group, allowing them to

receive packets sent by each other.

Release Modification

12.0(23)S This command was introduced.

12.2(13)T This command was integrated into Cisco IOS Release 12.2(13)T.

12.2(14)S This command was integrated into Cisco IOS Release 12.2(14)S.

12.2(18)SXE Support for this command was introduced on the Supervisor Engine 720.

12.2(27)SBC This command was integrated into Cisco IOS Release 12.2(27)SBC.

12.2(33)SRA This command was integrated into Cisco IOS Release 12.2(33)SRA.

12.2(33)MRB This command was integrated into Cisco IOS Release 12.2(33)MRB.