Table 65. Igmp Snooping Querier With Two Queriers - Allied Telesis AT-8100L/8 User Manual

Fast ethernet switches at-8100 series management software command line interface user’s guide alliedware plus version 2.2.5

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Chapter 42: IGMP Snooping Querier

network with IGMP snooping enabled and IGMP querier disabled

determines the standby querier and then the second standby querier by

comparing their IP addresses.

The following example consists of a LAN with three switches. See

Figure 123. IGMP snooping is enabled on all three switches. However,

IGMP snooping querier is enabled on switches 1 and 3. Switch 2

determines that switch 1 has the lowest IP routing address and forwards

all multicast packets to switch 1, making switch 1 the active querier.

Switch 3 becomes the standby querier in case switch 1 stops transmitting

query packets.

Switches 1 and 3 are only sending queriers. Neither switch detects

nor displays an opposing querier.

Figure 123. IGMP Snooping Querier with Two Queriers

Table 65 lists the switch settings that are illustrated in Figure 123.

Table 65. IGMP Snooping Querier with Two Queriers

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