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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 https://kb.netgear...
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
the switch is already set up to do vlan routing, and each vlan has a routing address like 10.1.10.1 , 10.1.15.1 etc.
questions:
Is it good practice to use those routing addresses?
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
So this is what I ended up doing, any comments on good, bad or ugly appreciated:
(GSM7352Sv2) >enable (GSM7352Sv2) #configure (GSM7352Sv2) (Config)#set igmp (GSM7352Sv2) (Config)#set igmp querier (GSM7352Sv2) (Config)#set igmp querier address 1.1.1.1 (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..................................... Enable Multicast Control Frame Count.................. 141041 IGMP header validation......................... Enabled Interfaces Enabled for IGMP Snooping........... None VLANs enabled for IGMP snooping................ 10 15Looks fine yeah.
Notice for your VLAN 10, the Querier VLAN Address is 0.0.0.0. The reason for this is because you can configure a querier two ways:
1. Set a "global" querier address for all VLANs on that switch, which is what you did.
2. Set a unique querier address for each individual VLAN. That can be useful in certain scenarios where you might want switch A to be the querier for VLAN x and switch B to be querier for vlan y.Most people would probably be fine with the first option, as you have done as well.
Don't forget that you still need to configure IGMP snooping as well, on the switch(es).
Cheersre: Don't forget that you still need to configure IGMP snooping as well, on the switch(es).
I'll research in depth later . in mean time using web/gui I did this:
1- at IGMP Global Configuration - I enabled.
2- at GMP Routing Interface Configuration - I enabled adminn mode for the 2 vlans.
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