Brocade Communications Systems Upgrade Pef IPMC5000PEF IPMC5000PEF Manual De Usuario

Displaying PIM RPF

The show ip pim rfp command displays what PIM sees as the reverse path to the source as shown in
the following. While there may be multiple routes back to the source, the one displayed by this
command is the one that PIM thinks is best.

device# show ip pim vrf eng rpf 130.50.11.10

Source 130.50.11.10 directly connected on e4/1

Syntax: show ip pim [vrf vrf-name ] rpf ip-address

The ip-address variable specifies the source address for RPF check.

The vrf option to display what PIM sees as the reverse path to the source for a VRF instance specified
by the vrf-name variable.

Configuring Multicast Source Discovery Protocol (MSDP)

The Multicast Source Discovery Protocol (MSDP) is used by Protocol Independent Multicast (PIM)
Sparse devices to exchange source information across PIM Sparse domains. Devices running MSDP
can discover PIM Sparse sources in other PIM Sparse domains.

The following figure shows an example of some PIM Sparse domains. For simplicity, this example
shows one Designated Router (DR), one group source, and one receiver for the group. Only one PIM
Sparse device within each domain needs to run MSDP.

FIGURE 6 PIM Sparse domains joined by MSDP devices

In this example, the source for PIM Sparse multicast group 232.0.1.95 is in PIM Sparse domain 1. The
source sends a packet for the group to its directly attached DR. The DR sends a PIM register message
for this flow to the RPDR. The RP is configured for MSDP, which enables the RP to exchange source

Displaying PIM RPF