topic Re: Multicast on ERS in ExtremeSwitching (ERS)

Multicast on ERS

Configterminal — Thu, 16 Nov 2023 19:18:49 GMT

Hello I have two PC's connected to an ERS 4950 switch, on the same VLAN. I am attempting to test multicast functionality but it doesn't seem to be working. This switch is purely an L2 switch and both laptops are Windows 10 laptops on the same VLAN. From my understanding the receiver should be able to receive the stream from the sender without any L3 settings. I am using VLC media player to btw.

This is the only configuration pertaining to multicast:

interface vlan xxx
ip igmp snooping
ip igmp send-query
ip igmp version 3
exit

Re: Multicast on ERS

EXTR_Paul — Fri, 17 Nov 2023 13:55:59 GMT

This should work all day. Nothing wrong with the switch config.

If you perform some "SHOW IP IGMP GROUPS" do you see any groups? If you don't see any groups that means that VLC player isn't streaming anything.

Make sure your Windows 10 laptops have the firewall disabled and any anti-virus isn't doing firewall blocking.

Also, make sure you are streaming properly.

Here is a VLC script that I know works.

:sout=#transcode{vcodec=h264,acodec=mpga,ab=128,channels=2,samplerate=44100}:duplicate{dst=rtp{dst=224.6.6.6,port=5004,mux=ts,sap,name=extreme,ttl=8},dst=display} :sout-all :ttl=8 :sout-keep

Re: Multicast on ERS

XTRMUser — Fri, 17 Nov 2023 15:15:13 GMT

Paul is much better than I am on this, but on my 4950's, I have the command "ip igmp proxy" along side the snooping command.

You probably don't need the igmp version 3, but I don't think it'll hurt anything.

I also don't have the "send-query".

It's been mentioned before, but I use(d) multicast hammer for testing. It's an older program but works. Put it on both of your laptops, and test (make sure you're using the correct interface (I'm assuming LAN vs WiFi)).

Watch your display settings. If it's too high, it will be jerky. So try fairly low (1024 x 768), and increase it as you can.

Finally, I've had to reboot the switch, then things started working (that was more with VOSS, but if you can, it might not hurt).

Hope one or more of these ideas might help.

Re: Multicast on ERS

EXTR_Paul — Fri, 17 Nov 2023 16:51:14 GMT

yeah, I second this. Try and find a copy of MC HAMMER. VLC player is too complicated and is buggy.

And really the ONLY command you need is "IP IGMP SNOOPING" within the VLAN. the rest of the stuff is not really needed.

Re: Multicast on ERS

Configterminal — Fri, 17 Nov 2023 17:15:01 GMT

any idea where I can get MC hammer, its impossible to find. Another question, if igmp snooping is enabled doesn't there need to be a querier on that VLAN? The uplink from the ERS which is purely L2 is a VSP where the L3 lives which is running SPBM. If I understand correctly the VLAN interface can either have "ip spb-multicaste enable" or "ip igmp snooping" + querier configured. The thing is, since my L3 interface is in a vrf that doesn't have an i-sid associated with it, I don't think "ip spb-multicast" will work (am I correct in thinking this). Heres the output from show ip igmp interface vrf xxx

command:==============================================================================================================
Igmp Interface - VRF vrf-028032-usrdt
==============================================================================================================
QUERY OPER QUERY WRONG LASTMEM SCOPE
IF INTVL STATUS VERS. VERS QUERIER MAXRSPT QUERY JOINS ROBUST QUERY MODE L2ISID ISID

V111 125 inact 3 3 0.0.0.0 100 0 0 2 10 routed-spb 111000 0

interface Vlan xxx
vrf xxx
ip address xxx.xxx.xxx.xxx/32
ip directed-broadcast enable
ip spb-multicast enable
ip igmp upnp-filter
ip igmp version 3

ip igmp access-list "upnp_mc_drop_239" 0.0.0.0/0.0.0.0 deny-both

ip dhcp-relay
exit

Re: Multicast on ERS

EXTR_Paul — Fri, 17 Nov 2023 19:56:52 GMT

Google for "NORTEL MC HAMMER".

Are you running your ERS in normal mode or SPBm mode?

Re: Multicast on ERS

Configterminal — Sat, 18 Nov 2023 13:35:35 GMT

Normal mode but I think the issue is just the laptops blocking multicast. Thanks for the input

Re: Multicast on ERS

EXTR_Paul — Sun, 19 Nov 2023 14:16:25 GMT

Great. If the switch is just running in normal mode and Layer 2 the ONLY command you need the in VLAN is "ip igmp snooping"

If that isn't working concentrate on your VLC settings and your laptops.

The source of truth will be the output from "SHOW IP IGMP GROUPS" command. if you don't see any groups the issue is with your laptops and the multicast emulating software.