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Configure 3com switches for ip cameras?

Posted on 2011-03-04
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Last Modified: 2012-05-11
Hi Experts,

I have few new ip cameras that need to be installed. I'm having a problem to configure my 3com switches to work with them. I really appreciate if you could give me some ideas how to get thru this otherwise thanks for reading.

Here is the current connection:
4 IP cameras --->3com4500_A --> 3com4500_B --> 3com5500G.

3com4500_A and 3com4500_B: both are 3com 4500 model. They can be called as the edge switches if you like.
3com5500G: This is 3com 5500G model and this is our layer 3 core switch.

I heard that the edge and core switches need to be configured with igmp but not sure where to start. Thanks.
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Question by:SJCA
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by:kdearing
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Unless the cameras are transmitting multicast traffic (doubtful), you don't have to worry about IGMP.

The only configuration normally necessary is to put the cameras (and DVR) on a separate VLAN.
However, with only 4 cameras, it's probably not worth it.
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by:SJCA
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they are trasmitting multicast traffic and I already create a vlan for them. Do i still need to configure IGMP?
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by:RKinsp
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If they are running Layer 2 you should configure IGMP snooping in order to limit the multicast to only the ports that need to receive it.

IGMP for 4500/4500

system-view
igmp-snooping enable
vlan X
igmp-snooping enable
igmp-snooping version Y

(default IGMP version is 2, depends on multicast router and operating systems, in your case whatever the cameras use for igmp).

If they are running Layer 3 you should configure the full multicast protocol, like PIM-SM, which would negotiate which layer 3 interfaces need to receive the multicast and forward appropriately. If you only have one Layer 3 switch (like the 5500G), you will need it configured for PIM-SM if the source of multicast is in a different vlan then the destinations.

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by:SJCA
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Thanks for the commands.

Yea, in my case, there is only one layer 3 switch (5500G). The source of multicast is in the same vlan of the destination. I have vlan 3 just for the cameras.

Do I have to run these commands on my 5500G too?

vlan 3
  igmp-snooping enable
 igmp-snooping version 2


When/where do I need to have 'igmp-snooping querier'?  edge switches or layer 3 core switch? Thanks.

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by:SJCA
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When I was trying to enable igmp-snooping on my core layer 3 switch then got this message below:

[Switch5500G-vlan3]igmp-snooping enable
  IGMP, PIM-DM or PIM-SM need to be disabled on VLAN interface before enabling IGMP-snooping on VLAN.
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Accepted Solution

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RKinsp earned 500 total points
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Hello SJCA,

Sorry for the delay, its a holiday here.

If all multicast is going to stay in a Layer 2 domain, you should probably disable mutlicast routing on your 5500 and well as IGMP (not IGMP snooping), because you are not "routing" the multicast (switching between VLANs).

system-view
undo multicast routing-enable
interface vlan X
undo igmp enable

I actually have never tested this in a single Layer 2 domain and I have a question myself because the multicast router is usually responsible for sending out "queries" in order to see who is listening to the multicast (which is what IGMP snooping snoops). Do you know if your software sends out queries?

-RK
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by:kdearing
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Why delete?
Valid answers wre given by RKinsp and myself.
Points should be awarded.
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by:Qlemo
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We do not have a solution - unless the OP confirms it is working.
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