Verifying a Multicast Configuration

To verify a multicast configuration, perform these tasks:

Purpose

Verify that SAP and SDP are configured to listen on the correct group addresses and ports.

Action

From the CLI, enter the show sap listen command.

Group Address   Port
224.2.127.254   9875

What it Means

The output shows a list of the group addresses and ports that SAP and SDP listen on. Verify the following information:

• Each group address configured, especially the default 224.2.127.254, is listed.
• Each port configured, especially the default 9875, is listed.

See Also

Purpose

Verify that IGMP version 2 is configured on all applicable interfaces.

Action

From the CLI, enter the show igmp interface command.

Interface: ge–0/0/0.0
    Querier: 192.168.4.36
    State:         Up Timeout:     197 Version:  2 Groups:      0

Configured Parameters:
IGMP Query Interval: 125.0
IGMP Query Response Interval: 10.0
IGMP Last Member Query Interval: 1.0
IGMP Robustness Count: 2

Derived Parameters:
IGMP Membership Timeout: 260.0
IGMP Other Querier Present Timeout: 255.0

What it Means

The output shows a list of the Services Router interfaces that are configured for IGMP. Verify the following information:

• Each interface on which IGMP is enabled is listed.
• Next to Version, the number 2 appears.

See Also

Purpose

Verify that PIM sparse mode is configured on all applicable interfaces.

Action

From the CLI, enter the show pim interfaces command.

Instance: PIM.master
Name                   Stat Mode       IP V State Count DR address
lo0.0                  Up   Sparse      4 2 DR        0 127.0.0.1
pime.32769             Up   Sparse      4 2 P2P       0

What it Means

The output shows a list of the Services Router interfaces that are configured for PIM. Verify the following information:

• Each interface on which PIM is enabled is listed.
• The network management interface, either ge–0/0/0 or fe–0/0/0, is not listed.
• Under Mode, the word Sparse appears.

See Also

Purpose

Verify that the PIM RP is statically configured with the correct IP address.

Action

From the CLI, enter the show pim rpscommand.

Instance: PIM.master
Address family INET
RP address      Type      Holdtime Timeout Active groups Group prefixes
192.168.14.27   static           0    None             2 224.0.0.0/4

What it Means

The output shows a list of the RP addresses that are configured for PIM. At least one RP must be configured. Verify the following information:

• The configured RP is listed with the proper IP address.
• Under Type, the word static appears.

See Also

Purpose

Verify that the PIM RPF routing table is configured correctly.

Action

From the CLI, enter the show multicast rpf command.

Multicast RPF table: inet.0 , 2 entries...

What it Means

The output shows the multicast RPF table that is configured for PIM. If no multicast RPF routing table is configured, RPF checks use inet.0. Verify the following information:

• The configured multicast RPF routing table is inet.0.
• The inet.0 table contains entries.

See Also