Switch – Multicast flooding network ProCurve Switch 2520G

hpigmpswitch

Switch: ProCurve Switch 2520G-8-PoE

Scenario: Multicast is flooded onto the network

Having multicast flooded makes it so TV is stuttering and pixelating. I do on my ProCurve have IGMP and Querier enabled. The switch is the querier. My messages are still flooded onto every port on the same untagged vlan (5).

On the switch I see the groups are created by the TV as I switch channels still it sends out. Anyone aware if this switch is NOT able to stop multicast flooding by default? If so how do I enable it on this switch?

Running config:

vlan 5 
name "CC_CAST" 
untagged 2-5,8 
ip address 172.16.1.5 255.255.255.0 
tagged 1,7,9 
ip igmp 
exit

Show version gives:

ProCurve Switch 2520G-8-PoE(vlan-5)# show version
Image stamp:    /sw/code/build/walle(t4b_release)
                Jul 27 2009 01:04:24
                J.14.01
                474
Boot Image:     Primary

show ip igmp 5 config shows:

IGMP Service 

  VLAN ID : 5    
  VLAN NAME    : CC_CAST 
  IGMP Enabled [No] : Yes
  Forward with High Priority [No] : No 
  Querier Allowed [Yes] : Yes

  Port Type      | IP Mcast
  ---- --------- + --------
  1    1000T     | Auto    
  3    1000T     | Auto    
  4    1000T     | Auto    
  5    1000T     | Auto    
  7    1000T     | Auto    
  8    1000T     | Auto    
  9    1000T     | Auto

and show ip igmp 5 

 Status and Counters - IP Multicast (IGMP) Status

 VLAN ID : 5
 VLAN Name : CC_CAST
 Querier Address : This switch is Querier

  Active Group Addresses Reports Queries Querier Access Port
  ---------------------- ------- ------- -------------------
  230.3.1.204            1       0                          
  239.255.3.22           374     0                          
  239.255.255.0          321     0                          
  239.255.255.10         321     0                          
  239.255.255.20         321     0                          
  239.255.255.30         321     0                          
  239.255.255.246        190     0                          
  239.255.255.250        967     0

show ip igmp group 230.3.1.204

 IGMP ports for group 230.3.1.204

  Port  Type      Access      Age Timer Leave Timer
  ----- --------- ----------- --------- -----------
  3     1000T     host        0         0

Best Answer

As per Aruba 2530 - IGMP Enabled, Querier on still no filtering

And RFC 4541

If no receivers join the group, then the switch can either flood the traffic to the IGMP querier or alternatively default to flooding the traffic. In this case it is flooding the traffic.

It makes sense as some multicast streams, ones that are designed not to be routed, may not use IGMP. This allows all hosts to receive the traffic.

You need to make sure that all groups are joined if you want to cut down on the flooding.

The 2520G is an older model, which is end of sale. It may be missing some of the newer features that other Procurve/ArubaOS switches have. Try upgrading to the latest software if you have any issues.

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