Need assistance configuring Multicast VOIP paging between switches

Raymond Norton
Raymond Norton used Ask the Experts™
on
I am attempting to configure VOIP multicast paging for a member school district. Currently, when a phone page is initiated, the green speaker light on the phone comes on and the mic red (mute) light comes on at same time.However, the page is not able to be heard on any phones. I am told this did work at one time but no one seems to be clear when it stopped working. As of yesterday, I upgraded their WAN switch and I am attempting to get the paging to work again.

Specifics.

Cisco Informacast server (Handles paging) is located on the WAN and is directly connected to a  vlan 110 port (near-end)
VOIP phones are located at the district on the far end of our WAN (far-end)

Near end switch connected to Informacast server on vlan 110:
HP 5412R , J9851A running KB.15.17.0007

Far end switch hands all vlan 110 VOIP traffic off to VLAN 72 (Phones):
Aruba 3810M, JL071A running KB.16.07.0003

Vlan 110 is configured on both switches and vlan 72 is only configured on the far end.


Obviously, the config is non-working (copied over from old switch) and has been modified in an attempt to resolve the issue but I will post for reference and advice on what to change.

near end switch vlan 110 config:
vlan 110
name "VLAN110"
untagged A3,B5-B6
tagged
A4-A9,A11-A19,A21-A22,A24,B1,B4,B7-B8,B13-B22,C1-C24,D1-D24,E1-E24,F1-F22
ip address 10.201.0.1 255.255.248.0
ip igmp
ip igmp forward A1,A3-A24,B1-B2,B4-B8,B10,B12-B22,C1-C24,D1-D24,E1-E24,F1-F22
qos priority 7
forbid B2
voice
exit

Far end switch vlan 110 and vlan 72 config:
vlan 72
name "VLAN72"
untagged 17,20,22
tagged 1
ip address 10.201.72.1 255.255.248.0
ip igmp
ip pim-sparse
ip-addr any
exit
vlan 110
name "VLAN110"
tagged 1,17
ip address 10.201.120.3 255.255.248.0
ip igmp
ip pim-sparse
ip-addr any
exit

What other info can I provide in an effort to resolve the issue?

Thank you for your assistance!
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nociSoftware Engineer
Distinguished Expert 2018

Commented:
Is there a VPN between the switches (as you are talking about Near end and Far end).

Switches do not need configuration of multicast. (The destination mac address is unknown ==> it will be sent to all ports in the same VLAN, or it has the multicast bit set and will be sent to all interfaces because of that).

If there is a VPN between the switches you need to check if the VPN does support Multicast. f.e. IPSEC does not, you may need to configure GRE over IPSEC to support it.
Raymond NortonWAN Admin

Author

Commented:
No, there is  not a VPN, just simple routing between switches, across our WAN. The original vendor that configured the phone system set up the original igmp configuration. I am confident we need something in place, or the paging would be working, currently.
nociSoftware Engineer
Distinguished Expert 2018

Commented:
Can you provide a schema of your network? Routers/Switches with their connections and address ranges used.
If public addresses are used  anonymize them. (replace first three bytes  by X.Y.Z  for all first 3 being the same X.Y.W for another set etc.).
Can you provide  configured routes?
Sr. Systems Engineer
Top Expert 2008
Commented:
>simple routing between switches, across our WAN
What do you have for a WAN? Has it changed since the last time the paging worked or was originally set up?
You changed the WAN switch, but is the new one capable of multicast routing?
Multicast over WAN links is tricky at best. You probably need to add a local paging relay at the site where the phones are located. The paging software server will send the audio to the relay and the relay will in turn multicast it locally. Those phones in the page group will get a message to listen for the multicast stream.
Raymond NortonWAN Admin

Author

Commented:
Although the school district believed the phone paging worked in the past, I checked with another district and they are using a relay, as you described, without configuring igmp. Their paging is working great over the phones and speaker system. I have a test unit I will be trying in the next couple week to see if this is the fix.

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