I believe for the 242 string on the voice VLAN we also had to include what was in the string on the data vlan for enabling L2Q and the L2QVLAN. It's been well over a year since I did DHCP strings for Avaya phones, but I do remember it wouldn't work the way they gave the examples.
Also, whenever you move an Avaya phone from subnet to subnet they need to be factory reset. The darn things remember where they were and refuse to take a different DHCP value.
Original Message:
Sent: 06-19-2023 11:18 AM
From: IR35
Subject: DHCP option 242 not working
in vlan1: L2Q=1,L2QVLAN=22,VLANTEST=0
in 22: MCIPADD=10.245.0.97,MCPORT=1719,HTTPSRVR=10.245.0.97
I've done some more testing, and now things are getting even more bizar. I enabled port mirroring and did some capturing with wireshark, which showed me that the option 242 is coming through on all the switches, 1930's included.
The phone that was plugged while i was capturing, got set up perfectly, even when connected on the Aruba. Later i moved it to another port, configured exactly the same, and it wouldn't get out of the Data vlan anymore, even on an HP switch.
So I'm starting to wonder if it's the phones themselves that are acting up, but I can't find any consistency in the behaviour, especially at our main site. First it appeared that it only worked on the HP switches, but now i have had successes and failures on both types.
I'm beginning to think I may have to check on the Avaya server, to make sure it's not setting any options that override what i send by DHCP. And that that's maybe the reason why i can get a phone configured after a factory reset, but it won't work anymore when moving to a different port, which has the exact same Vlan configuration.
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ICT Rivierenland
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Original Message:
Sent: 06-19-2023 10:07 AM
From: AM49
Subject: DHCP option 242 not working
I have worked on the DHCP strings for J series phones at a couple of previous employers. What DHCP strings do you have in Option 242 on each VLAN?
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Aaron Moore
Original Message:
Sent: 06-16-2023 02:24 AM
From: IR35
Subject: DHCP option 242 not working
This issue is expanding, since we are deploying the 1930 (and in the future 1830) switches to all our sites, 15 in total.
Yesterday i've deployed Avaya J100 series phones in 3 more sites, with slightly different setup from our main site, where the original issue occurs.
Those sites do not use a DHCP relay, but Vlan1 DHCP is on the Windows server, and Vlan22 on the firewall (Ubiquity Edgerouter POE).
2 sites, with only HP switches, worked without a problem, the third, with an Aruba 1930, has an issue, similar to the one above.
Here the phone gets an IP + Vlan settings from Vlan1 DHCP, it switches to Vlan22 (this can also be confirmed on the switch port), but then fails to get a new IP from Vlan22 DHCP.
I've put a laptop in a port with Vlan22 untagged, and it gets an ip without a problem, so the DHCP works.
So at this time it looks like there is some issue when using multiple Vlans on a port and DHCP, when using an Aruba 1930 in combination with Avaya IP phones.
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ICT Rivierenland