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--- igmp_snooping_groups [2024/04/24 16:11] – created walkeradmin
+++ igmp_snooping_groups [2024/04/24 16:47] (current) – [IGMP Snooping Groups] walkeradmin
@@ Line 14: / Line 14: @@
 . Services Synchronisation\\
 . Dual Output Prevention\\
-\\
 \\
 This is important to know because we can see the multcasts for each of these processes.
@@ Line 20: / Line 19: @@
 \\
 ----
+==== IGMP Snooping Groups ====
+Once you have logged in to your switch (in this example I am using a Cisco switch) you can issue this command from the top level (no need to go in to the configuration mode).
+\\
+\\
+show ip igmp snooping groups
+\\
+\\
+{{:sh_ip_igmp_snooping_01.png?700|}}
+\\
+\\
+\\
+The VLAN column is which VLAN each of the interfaces is in.
+\\
+\\
+VLAN 100 - Management (the management interfaces of each server are teamed)
+\\
+\\
+VLAN 250 - Primary EL output and Mux input
+\\
+\\
+VLAN 300 - Secondary EL output and Mux input
+\\
+\\
+VLAN 400 - Mux output VLAN
+\\
+\\
+We can pick out of the list certain Multicast Groups and their function:
+\\
+\\
+<file>
+Vlan      Group                    Type        Version     Port List
+-----------------------------------------------------------------------
+       239.211.1.1              igmp        v2          Gi0/8, Gi0/13, Gi0/23  -  Services Synchronisation (EL)
+       239.211.2.1              igmp        v2          Gi0/8, Gi0/13, Gi0/23  -  Dual Output Prevention (EL)
+       239.225.0.1              igmp        v2          Gi0/15, Gi0/16, Gi0/23 -  StatMux Announcer
+                                                                                     (EL <-> Mux)
+</file>
+\\
+<file>
+       239.1.1.1                igmp        v2          Gi0/27, Gi0/28  -  Service 01 Multicast (Primary EL)
+       239.1.1.2                igmp        v2          Gi0/27, Gi0/28  -  Service 02 Multicast (Primary EL)
+       239.1.1.3                igmp        v2          Gi0/27, Gi0/28  -  Service 03 Multicast (Primary EL)
+       239.1.1.4                igmp        v2          Gi0/27, Gi0/28  -  Service 04 Multicast (Primary EL)
+       239.225.0.1              igmp        v2          Gi0/25, Gi0/26, Gi0/27, Gi0/28 - StatMux Announcer
+                                                                                            (EL <-> Mux)
+</file>
+\\
+<file>
+       239.2.1.1                igmp        v2          Gi0/33, Gi0/34  -  Service 01 Multicast (Secondary EL)
+       239.2.1.2                igmp        v2          Gi0/33, Gi0/34  -  Service 02 Multicast (Secondary EL)
+       239.2.1.3                igmp        v2          Gi0/33, Gi0/34  -  Service 03 Multicast (Secondary EL)
+       239.2.1.4                igmp        v2          Gi0/33, Gi0/34  -  Service 04 Multicast (Secondary EL)
+       239.225.0.1              igmp        v2          Gi0/31, Gi0/32, Gi0/33, Gi0/34 - StatMux Announcer
+                                                                                            (EL <-> Mux)
+</file>
+\\
+       239.0.0.200              igmp        v2          Gi0/37, Gi0/38  -  Mux Multicast Output
+\\
+\\
+----