IGMP

Sunday, 18 May 2008 13:32

Firewalls - Cisco - PIX

To Allow multicast traffic from 224.0.1.50 on the outside and traffic to go through the PIX to outside interface.

(config)#Access-list 109 permit udp any host 224.0.1.50
(config)#Interface Ethernet0
(config-if)#Igmp access-group 109

 (config)#Interface ethernet1
(config-if)#Igmp forward interface outside
(config-if)#Igmp join-group 224.0.1.50

 Multicast IP range

• 224.0.0.0 239.255.255.255
• 224.0.0.1 multicast broadcast

Saves flooding the networks with multicast packets. Using a R Point.

Below Enables multicast routing.

1. Sets the address of the RP
2. Sets the priority of PIX interface to 5 (default 1)

(config)#multicast-routing
(config)#pim rp-address 172.16.10.1
(config)#interface ethernet1
(config-if)pim dr-priority 5

General show commands for multicast forwarding information database

Show mfib
Show mrib
Debug igmp
Debug mfib
Debug mrib