
Purpose
Command or Action
nsf
Specifies the MDT source address.
mdt source type interface-path-id
Step 5
Example:
RP/0/RP0/CPU0:router(config-mcast-default-ipv4)#
The MDT source interface name should be the same
as the one used for BGP.
Note
mdt source GigE 0/1/0/0
Enables multicast routing and forwarding on all new and
existing interfaces. You can also enable individual interfaces.
interface all enable
Example:
RP/0/RP0/CPU0:router(config-mcast-default-ipv4)#
Step 6
To avoid any possibility of a reverse-path
forwarding (RPF) failure, you should proactively
enable any interfaces that might possibly carry
multicast traffic.
Caution
interface all enable
Configures a VPN routing and forwarding (VRF) instance
and enters VRF configuration mode.
vrf vrf-name
Example:
RP/0/RP0/CPU0:router(config-mcast-default-)# vrf
Step 7
vrf_A
Specifies the virtual routing and forwarding instance for the
ipv4 address family.
address-family
{
ipv4
}]
Step 8
Specifies the multicast distribution tree (MDT) default group
address.
mdt default mdt-group-address
Example:
RP/0/RP0/CPU0:router(config-mcast-vrf_A-ipv4)#
Step 9
mdt default 239.23.2.1
(IPv4 MVPN configuration only) Specifies the multicast
group address range to be used for data MDT traffic.
mdt data mdt-group-address/prefix-length threshold
threshold acl-name
Step 10
Example:
RP/0/RP0/CPU0:router(config-mcast-vrf_A-ipv4)#
This group range should not overlap the MDT
default group.
Note
This is an optional command. The default threshold beyond
which traffic is sent using a data MDT group is 1 kbps.
However, you may configure a higher threshold, if desired.
mdt data 239.23.3.0/24 threshold 1200 acl-A
You may also, optionally, configure an access list to limit
the number of groups to be tunneled through a data MDT
group. Traffic from groups not on the access-list continues
to be tunneled using the default MDT group.
This is an optional step.
mdt mtu size
Step 11
Example:
RP/0/RP0/CPU0:router(config-mcast-default-ipv4)#
Specifies the MTU size. It is recommended to configure a
high value, to accommodate the maximum multicast packet
size.
Cisco IOS XR Multicast Configuration Guide for the Cisco CRS Router, Release 5.2.x
103
Implementing Multicast Routing on Cisco IOS XR Software
Configuring Multicast VPN