cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
Announcements
Join Customer Connection to register!
3172
Views
0
Helpful
2
Replies
Surya ARBY
Enthusiast

Per-VLAN IGMP Snooping Querier on Catalyst 4500 (sup7)

It seems to be impossible to enable igmp snooping querier on a per vlan basis.

http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/15.1/XE_330SG/configuration/guide/multi.html#wp1163784

The doc is clear :

The IGMP Snooping Querier feature can be enabled either globally or per-VLAN.

but it's wrong ! I'm running

D7402_DC#show version

Cisco IOS Software, IOS-XE Software, Catalyst 4500 L3 Switch Software (cat4500e-UNIVERSALK9-M), Version 03.03.01.SG RELEASE SOFTWARE (fc2)Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2012 by Cisco Systems, Inc. Compiled Sun 26-Aug-12 13:45 by prod_rel_team
[...]

System image file is "bootflash:/cat4500e-universalk9.SPA.03.03.01.SG.151-1.SG1.bin"

By default IGMP snooping is Enabled and IGMP snooping querier is disabled :

D7402_DC(config)#ip igmp snooping vlan 4 querier

Command did not take effect due to reason: IGMP switch querier is globally disabled.

So of course I enable it globally; and IGMP snooping querier is applied on all VLANs

D7402_DC(config)#ip igmp snooping querier 

D7402_DC#show ip igmp snooping querier

Vlan      IP Address               IGMP Version   Port            

-------------------------------------------------------------

1         172.22.248.42            v2            Switch                  

4         10.160.0.5               v2            Switch                  

8         172.22.248.42            v2            Switch                  

9         172.22.248.42            v2            Switch                  

10        172.22.248.42            v2            Switch                

11        172.22.248.42            v2            Switch                  

12        172.22.248.42            v2            Switch

But when I issue

D7402_DC(config)#no ip igmp snooping querier  

the command is deleted from the config but IGMP  snooping querier is still active on ALL Vlans; of you want to disable  IGMP snoopin querier; you have to disable IGMP snooping and then enable  it again if you want to keep L2 multicast forwarding logic

D7402_DC(config)#no ip igmp snooping querier

D7402_DC(config)#exit

D7402_DC#show ip igmp snooping querier

Vlan      IP Address               IGMP Version   Port            

-------------------------------------------------------------

1         172.22.248.42            v2            Router                  

4         10.160.0.5               v2            Router                  

8         172.22.248.42            v2            Router                  

9         172.22.248.42            v2            Router                  

10        172.22.248.42            v2            Router                  

11        172.22.248.42            v2            Router                  

12        172.22.248.42            v2            Router                  

D7402_DC#conf t

Enter configuration commands, one per line.  End with CNTL/Z.

D7402_DC(config)#no ip igmp snooping

D7402_DC(config)#exit

D7402_DC#show ip igmp snooping querier

Vlan      IP Address               IGMP Version   Port            

-------------------------------------------------------------

D7402_DC#conf t

Enter configuration commands, one per line.  End with CNTL/Z.

D7402_DC(config)#ip igmp snooping

D7402_DC(config)#

D7402_DC(config)#

D7402_DC(config)#exit

D7402_DC#conf tshow ip igmp snooping querier

Vlan      IP Address               IGMP Version   Port            

-------------------------------------------------------------

D7402_DC#

2 REPLIES 2
MARVIN SPITERI
Beginner

HI, I m using sup 7 too on 4506 E switch and have issue when I enabled

ip igmp snooping querier 

as you say this applies to all vlans - in turn this affected badly VM machines - when I issue show mac-address table on uplinks to VM I see 'GMP' instead of 'system' for some macs - when I remove

ip igmp snooping querier 

for certain vlans that does not require multiast then all returns back to normal

What is the behavior seen with the VMs ? I've not seen this when I performed my installation. I was running IOS XE 3.3.1 / 15.1SG1