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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
enabled 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
15
Hi 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
The switch virtual interface is the IP Address you have assigned on a specific VLAN. This is best described if you have configured VLAN Routing on the switch. In order to route between VLANs, VLAN interfaces must have IP addresses. For example: VLAN 10 has a network IP Address of 192.168.10.0. You can assign an IP Address to VLAN 10 such as 192.168.10.1 or 192.168.10.254.
Regards,
DaneA
NETGEAR Community Teamthe 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
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