What is the difference in the roles of IGMP snooping between Querier, Aggregator, and Access?
Zyxel_Chris
Posts: 727 Zyxel Employee
in IPTV
In the context of Internet Group Management Protocol (IGMP) snooping on a network switch, the terms "Querier," "Aggregator," and "Access" refer to different roles or functions that the switch can perform. Let's explore the distinctions between these roles:
Querier:
- Role:
- The Querier is responsible for generating IGMP Query messages on a VLAN to discover which hosts in that VLAN are members of particular multicast groups.
- It's usually connected to the streaming server.
Aggregator:
- Role:
- The Aggregator is not a standard term used in the context of IGMP snooping. It's possible that it could be used informally to describe a switch or device that is aggregating or consolidating information related to multicast group memberships.
- It's usually located the downstream of Querier role switch.
Access:
- Role:
- An Access switch is a device that connects directly to end devices such as computers, printers, or IP phones.
- No streaming server connected, but only connected with the end devices.
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