3Com Switch 4500 26-Port Configuration Manual page 157

Figure 46 Implementing IGMP Snooping
A ro u te r
ru n n in g IG M P
Switch 4500 running
A E th e rn e t S w itc h
IGMP Snooping
ru n n in g IG M P S n o o p in g
Table 154 explains IGMP Snooping terminology.
Table 154 IGMP Snooping Terminology
Term
IGMP general query message
In te rn e t
IG M P p a c k e ts
IG M P p a c k e ts
Meaning
Transmitted by the multicast router to query which multicast
group contains member. When a router port receives an
IGMP general query message, the Switch 4500 will reset the
aging timer of the port. When a port other than a router
port receives the IGMP general query message, the Switch
4500 will notify the multicast router that a port is ready to
join a multicast group and starts the aging timer for the port.
IGMP Snooping Overview 155