Understanding Enabling And Disabling Interfaces; Multicast Routing Information Base; Msdp Md5 Password Authentication - Cisco XR 12000 Series Configuration Manual

Implementing Multicast Routing on Cisco IOS XR Software Cisco ASR 9000 Series Routers

Understanding Enabling and Disabling Interfaces

When the Cisco IOS XR 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)# multicast-routing
RP/0/0/CPU0:router(config-mcast)# interface all enable
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)# interface pos 0/1/0/0
RP/0/0/CPU0:router(config-mcast-default-ipv4-if)# disable

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 protocols; they select the preferred multicast route from comparable ones, and
they notify their clients of changes in selected attributes of any multicast route.
Multicast Forwarding Information Base
Multicast Forwarding Information Base (MFIB) is a protocol-independent multicast forwarding system
that contains unique multicast forwarding entries for each source or group pair known in a given
network. There is a separate MFIB for every logical network (VPN) in which the router is configured.
Each MFIB entry resolves a given source or group pair to an incoming interface (IIF) for reverse
forwarding (RPF) checking and an outgoing interface list (olist) for multicast forwarding.

MSDP MD5 Password Authentication

MSDP MD5 password authentication is an enhancement to support Message Digest 5 (MD5) signature
protection on a TCP connection between two Multicast Source Discovery Protocol (MSDP) peers. This
feature provides added security by protecting MSDP against the threat of spoofed TCP segments being
introduced into the TCP connection stream.
MSDP MD5 password authentication verifies each segment sent on the TCP connection between MSDP
peers. The password command is used to enable MD5 authentication for TCP connections between two
MSDP peers. When MD5 authentication is enabled between two MSDP peers, each segment sent on the
TCP connection between the peers is verified.
OL-
Information About Implementing Multicast Routing
Multicast Configuration Guide
MCC-23