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igmp querier address
we run two linux clusters. they use different vlans. they are attached to the stack using LAGS .
Now we need to set up IGMP querier and IGMP snooping .
Per this document
these commands are used:
(Netgear switch) #vlan database (Netgear switch) (vlan)#set igmp 1 (Netgear switch) (vlan)#set igmp querier 1 (Netgear switch) (vlan)#exit (Netgear switch) #config (Netgear switch) (config)#set igmp querier (Netgear switch) (config)#set igmp querier address 10.10.10.1 (Netgear switch) (config)#exit
My questions: 'does the igmp querier address' need to be part of the switch IP address subnet, or unique?
Hi,
These querier addresses can be anything you want really. It is not any actual ip address. What is it then? It is used as part of an election process. There can only be one querier active in a network. If multiple queriers are configured then an election process will begin. Who will be elected the active querier? The switch that has the lowest ip address value configured, in the querier ip field.
So, it is not a good idea to set the querier ip to the same as the switch. It should instead be setup up as an election model. What I would do, is set querier address 1.1.1.1 on the switch I want to be igmp querier primarily. The others I would set 2.2.2.2, 3.3.3.3, etc. As a hierarchical system: if the current querier goes down then the switch with the next lowest querier ip value would take over as querier.
This is important because you probably want your core/distribution switch to be the main querier.
Cheers
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This is what I've doen so far:
(GSM7352Sv2) >enable (GSM7352Sv2) #configure (GSM7352Sv2) (Config)#set igmp querier (GSM7352Sv2) (Config)#set igmp querier address 10.10.10.1 (GSM7352Sv2) (Config)#exit (GSM7352Sv2) #vlan database (GSM7352Sv2) (Vlan)#set igmp 10 (GSM7352Sv2) (Vlan)#set igmp querier 10 (GSM7352Sv2) (Vlan)#set igmp 15 (GSM7352Sv2) (Vlan)#set igmp querier 15 (GSM7352Sv2) (Vlan)#exit (GSM7352Sv2) #show igmpsnooping querier vlan 10 VLAN 10 : IGMP Snooping querier status ---------------------------------------------- IGMP Snooping Querier VLAN Mode................ Enable Querier Election Participate Mode.............. Disable Querier VLAN Address........................... 0.0.0.0 Operational State.............................. Disabled Operational version............................ 2
(GSM7352Sv2) #show igmpsnooping Admin Mode..................................... Disable Multicast Control Frame Count.................. 0 IGMP header validation......................... Enabled Interfaces Enabled for IGMP Snooping........... None VLANs enabled for IGMP snooping................ 10 15enabled admin mode:
(GSM7352Sv2) #configure (GSM7352Sv2) (Config)#set igmp (GSM7352Sv2) (Config)#exit (GSM7352Sv2) #show igmpsnooping Admin Mode..................................... Enable Multicast Control Frame Count.................. 0 IGMP header validation......................... Enabled Interfaces Enabled for IGMP Snooping........... None VLANs enabled for IGMP snooping................ 10 15Hi robfantini,
As far as I know, the best practice is to use the IP address of the appropriate switch virtual interface as the IGMP Querier Address. If ever the switch does not have a switch virtual interface, you can use an unused IP address within the same subnet as the target VLAN.
Let me share this forum thread and it might help as reference.
Regards,
DaneA
NETGEAR Community Team
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