Understanding Enabling And Disabling Interfaces; Multicast Routing Information Base - Cisco XR12000 Series Configuration Manual

Implementing Multicast Routing on Cisco IOS XR Software
command together with the interface type interface-path-id or interface all command. This causes PIM or
IGMP protocols to disallow multicast routing and to allow only multicast forwarding on those interfaces
specified. However, routing can still be explicitly enabled on specified individual interfaces.
The following configuration disables multicast routing interface inheritance under PIM and IGMP generally,
although forwarding enablement continues. The example shows interface enablement under IGMP of
GigabitEthernet 0/6/0/3:
RP/0/0/CPU0:router#
RP/0/0/CPU0:router(config-mcast-default-ipv4)#
RP/0/0/CPU0:router(config-mcast-default-ipv4)#
!
!
RP/0/0/CPU0:router(config)#
RP/0/0/CPU0:router(config-igmp)#
RP/0/0/CPU0:router(config-igmp)#
RP/0/0/CPU0:router(config-igmp-name-if)#
For related information, see

Understanding Enabling and Disabling Interfaces

When the Cisco IOS XR Software multicast routing feature is configured on your router, by default, no
interfaces are enabled.
To enable multicast routing and protocols on a single interface or multiple interfaces, you must explicitly
enable interfaces using the interface command in multicast routing configuration mode.
To set up multicast routing on all interfaces, enter the interface all command in multicast routing configuration
mode. For any interface to be fully enabled for multicast routing, it must be enabled specifically (or be default)
in multicast routing configuration mode, and it must not be disabled in the PIM and IGMP/MLD configuration
modes.
For example, in the following configuration, all interfaces are explicitly configured from multicast routing
configuration submode:
RP/0/0/CPU0:router(config)#
RP/0/0/CPU0:router(config-mcast)#
To disable an interface that was globally configured from the multicast routing configuration submode, enter
interface configuration submode, as illustrated in the following example:
RP/0/0/CPU0:router(config-mcast)#
RP/0/0/CPU0:router(config-mcast-default-ipv4-if)#

Multicast Routing Information Base

The Multicast Routing Information Base (MRIB) is a protocol-independent multicast routing table that
describes a logical network in which one or more multicast routing protocols are running. The tables contain
generic multicast routes installed by individual multicast routing protocols. There is an MRIB for every logical
network (VPN) in which the router is configured. MRIBs do not redistribute routes among multicast routing
OL-30405-02
multicast-routing address-family ipv4
router igmp
vrf default
interface GigabitEthernet0/6/0/0
Understanding Enabling and Disabling Interfaces, on page 43
multicast-routing
interface all enable
interface GigabitEthernet0pos 0/1/0/0
Cisco IOS XR Multicast Configuration Guide for the Cisco XR12000 Series Router, Release 5.1.x
Understanding Enabling and Disabling Interfaces
interface all enable
interface-inheritance disable
router enable
disable
43