NETGEAR is aware of a growing number of phone and online scams. To learn how to stay safe click here.
Forum Discussion
Solved
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
re: 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.
I would set it up one of two ways: per VLAN or global.
Global
Enable IGMP snooping.
Enable IGMP snooping on your ports under the IGMP interface configuration.
Enable multicast router mode on the ports that uplinks to the other switches.
Enable IGMP Querier
Set a global Querier IP address (1.1.1.1 and next switch 2.2.2.2, etc.)
Per VLAN
Enable IGMP snooping.
Enable IGMP snooping on your VLANs under the IGMP VLAN configuration.
Enable multicast router mode on the ports that uplinks to the other switches.
Enable IGMP Querier
Leave the global address at 0.0.0.0.
Set instead a Querier IP address per VLAN under the Querier VLAN configuration (VLAN10=1.1.1.10 and VLAN15=1.1.1.15. Next switch VLAN10=2.2.2.10 and VLAN15=2.2.2.15, etc).
Make sure “Querier Election Participation Mode” is enabled for each VLAN.
My preference is per VLAN because it gives more control. Say, in some VLANs I might not want snooping to occur, while in others I do. So, I am more comfortable with that config.
Hope that helps :)
thank you for that. as suggested I used the per vlan mode. it is a great help to have your advise on this forum!
No problem at all. Happy to help :)
NETGEAR Academy
Boost your skills with the Netgear Academy - Get trained, certified and stay ahead with the latest Netgear technology!
Join Us!
