Understanding Interface Configuration Inheritance Disablement; Understanding Enabling And Disabling Interfaces - Cisco ASR 9000 Series Configuration Manual

Implementing Layer-3 Multicast Routing on Cisco IOS XR Software
router msdp
connect-source
sa-filter
filter-sa-request list
remote-as
ttl-threshold

Understanding Interface Configuration Inheritance Disablement

As stated elsewhere, Cisco IOS XR Software allows you to configure multiple interfaces by applying
configurations within a multicast routing submode that can be inherited by all interfaces.
To override the inheritance feature on specific interfaces or on all interfaces, you can enter the address-family
IPv4 or IPv6 submode of multicast routing configuration mode, and enter the interface-inheritance disable
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/RSP0/CPU0:router#
RP/0/RSP0/CPU0:router(config-mcast-default-ipv4)#
RP/0/RSP0/CPU0:router(config-mcast-default-ipv4)#
!
!
RP/0/RSP0/CPU0:router(config)#
RP/0/RSP0/CPU0:router(config-igmp)#
RP/0/RSP0/CPU0:router(config-igmp)#
RP/0/RSP0/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/RSP0/CPU0:router(config)#
RP/0/RSP0/CPU0:router(config-mcast)#
multicast-routing address-family ipv4
router igmp
vrf default
interface GigabitEthernet0/6/0/0
Understanding Enabling and Disabling Interfaces, on page 187
multicast-routing
Cisco ASR 9000 Series Aggregation Services Router Multicast Configuration Guide, Release 6.0.x
Understanding Interface Configuration Inheritance Disablement
interface all enable
interface-inheritance disable
router enable
interface all enable
187