First we need to allow multicast routing:
ip multicast-routing distributed
In our example we have two vlans:
VLAN 3000 – clients that will receive multicast traffic
VLAN 4000 – in this VLAN are sources of multicast traffic
enter the following commands:
VLAN 3000 – clients that will receive multicast traffic
VLAN 4000 – in this VLAN are sources of multicast traffic
enter the following commands:
ip igmp snooping querier ip igmp snooping vlan 3000 mrouter learn cgmp ip igmp snooping vlan 4000 mrouter learn cgmp
According Cisco’s official documentation: “A querier is a network device that sends query messages to discover which network devices are members of a given multicast group.”
The next two lines configure VLAN 3000 and VLAN 4000 as multicast router port (static connection to a multicast router) and to learn sooping from CGMP (Cisco Group Management Protocol) self-join packets.
Configuration of VLAN interfaces 3000 and 4000
interface Vlan3000 description multicast_client ip address 172.20.20.1 255.255.255.0 ip pim dense-mode ! interface Vlan4000 description source_multicast ip address 150.158.231.111 255.255.0.0 ip pim dense-mode !
You can read this article about pim dense-mode.
To view IGMP grops:
To view IGMP grops:
sh ip igmp groups 226.168.20.44 Vlan3000 5d04h 00:02:38 172.20.20.6 226.168.20.45 Vlan3000 2d03h 00:02:35 172.20.20.6 226.168.20.46 Vlan3000 1d14h 00:02:34 172.20.20.6 226.168.20.47 Vlan3000 2d11h 00:02:41 172.20.20.6 226.168.20.49 Vlan3000 00:58:13 00:02:38 172.20.20.9 226.168.20.48 Vlan3000 1d14h 00:02:40 172.20.20.6 226.168.20.51 Vlan3000 00:58:13 00:02:39 172.20.20.9 226.168.20.50 Vlan3000 00:58:13 00:02:40 172.20.20.9 226.168.20.53 Vlan3000 00:58:13 00:02:33 172.20.20.9 226.168.20.52 Vlan3000 00:58:13 00:02:39 172.20.20.9 226.168.20.55 Vlan3000 1d14h 00:02:41 172.20.20.6 226.168.20.54 Vlan3000 00:58:13 00:02:35 172.20.20.9 226.168.20.57 Vlan3000 1d14h 00:02:36 172.20.20.6
To view membership
multicast#sh ip igmp membership all
Flags: A - aggregate, T - tracked
L - Local, S - static, V - virtual, R - Reported through v3
I - v3lite, U - Urd, M - SSM (S,G) channel
1,2,3 - The version of IGMP, the group is in
Channel/Group-Flags:
/ - Filtering entry (Exclude mode (S,G), Include mode (G))
Reporter:
- last reporter if group is not explicitly tracked
/ - reporter in include mode, reporter in exclude
*,226.168.20.27 172.20.20.6 1d14h 02:37 2A Vl3000
*,226.168.20.26 172.20.20.6 1d14h 02:30 2A Vl3000
*,226.168.20.37 172.20.20.6 1d14h 02:32 2A Vl3000
*,226.168.20.40 172.20.20.6 2d03h 02:28 2A Vl3000
*,226.168.20.41 172.20.20.6 2d03h 02:31 2A Vl3000
*,226.168.20.43 172.20.20.6 1d14h 02:30 2A Vl3000
*,226.168.20.44 172.20.20.6 5d04h 02:34 2A Vl3000
*,226.168.20.45 172.20.20.6 2d03h 02:28 2A Vl3000
*,226.168.20.46 172.20.20.6 1d14h 02:34 2A Vl3000
*,226.168.20.47 172.20.20.6 2d11h 02:32 2A Vl3000
*,226.168.20.49 172.20.20.9 01:00:18 02:28 2A Vl3000
*,226.168.20.48 172.20.20.6 1d14h 02:33 2A Vl3000
*,226.168.20.51 172.20.20.9 01:00:18 02:29 2A Vl3000
*,226.168.20.50 172.20.20.9 01:00:18 02:35 2A Vl3000
*,226.168.20.53 172.20.20.9 01:00:18 02:31 2A Vl3000
To view snooping groups
multicast#sh ip igmp snooping groups Vlan Group Type Version Port List ----------------------------------------------------------------------- 3000 226.168.1.1 igmp Gi0/6 3000 226.168.1.2 igmp Gi0/4 3000 226.168.1.3 igmp Gi0/4 3000 226.168.1.4 igmp Gi0/4 3000 226.168.1.6 igmp Gi0/6 3000 226.168.1.7 igmp Gi0/6 3000 226.168.1.9 igmp Gi0/6 3000 226.168.1.10 igmp Gi0/4 3000 226.168.1.12 igmp Gi0/4 3000 226.168.1.13 igmp Gi0/4 3000 226.168.1.14 igmp Gi0/4 3000 226.168.1.15 igmp Gi0/4 3000 226.168.1.16 igmp Gi0/4 3000 226.168.1.17 igmp Gi0/4 3000 226.168.1.18 igmp Gi0/4 3000 226.168.1.19 igmp Gi0/4 3000 226.168.1.22 igmp Gi0/6 3000 226.168.1.23 igmp Gi0/4 3000 226.168.1.24 igmp Gi0/4 3000 226.168.1.26 igmp Gi0/6 3000 226.168.1.28 igmp Gi0/6 3000 226.168.1.30 igmp Gi0/4
Source: blog.webdir.bg
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