Multicast-IGMP

[TekashiSixNine]

Hello, I have a question. I have a network with only routers. I have three igmp groups on three routers. I have configured IGMP only with the command :

ip igmp join-group ..... .

I have pim sparse with Auto-rp and sparse-dense mode. My question is if I haven't configured an igmp querier, is there one selected by default, or not? If there is how can I check which router is?

[Flavio Miranda · Accepted solution]

Hi

 "In IGMPv1, there is no election of an IGMP querier. If more than one device on the segment exists, all the
devices send periodic IGMP queries."

"

IGMPv2 also enhances IGMP by providing support for the following capabilities:

Querier election process--Provides the capability for IGMPv2 devices to elect the IGMP querier without having to rely on the multicast routing protocol to perform the process."

"
When there are multiple routers, the rule for electing the Querier is simple: The router whose connected interface has the lowest IP address is the Querier.
"

http://www.bscottrandall.com/5.1.3.html