Explorer

Question

VVX 250 come from the factory with LLDP and CDP enabled for VLAN discovery

Forum|Forum|2 years ago
February 14, 2023
5 replies
6 views

Hi everyone,

I'm looking for feedback from someone who recently got Poly VVX 250 phones. What we discovered is that VVX 250 come from the factory with LLDP and CDP enabled for VLAN discovery and if that doesn't work (times out) the phone never gets L2 network connectivity and from there you can imagine, no IP, no nothing, forget being dropped into the correct VLAN - zero. It doesn't have any fallback mechanism to, for example drop to native VLAN if those 2 methods fail. Per Poly, if either is enabled, the entire mechanism (plan B) for VLAN identification via DHCP's DVD string is not even attempted. It's stated clearly in their docs and as we found out; both LLDP and CDP are enabled out of the box.

Anyone out there facing this? Sure, the fix is super easy - disable them but that means we must touch the phones and that's a big problem. I was hoping for drop ship, etc and just to be clear - this issue is miles upstream from any ZTP, mac address upload, etc - the thing simply doesn't get network connectivity so none of the cool stuff downstream has a chance to occur.

Thanks

BrandonS

Community Champion | Partner

What is the use case here and what are you expecting to happen/trying to accomplish?

LLDP is super standard and available on any managed switch that supports VLANs. The only reason to not to use it would be an unmanaged switch like a home user and/or a switch that does not support VLANs and in that case there is no point to assign a VLAN, right?

BoyanAuthor

Explorer

@BrandonS Thank you and yes - the use case is unmanaged network. No LLDP and no CDP but the issue is that the phone does NOT fall back to anything; in the absence of VLAN selection via LLDP and CDP the phone sits there forever, never falling back to un-tagged traffic and hence no IP, no connectivity

BrandonS

Community Champion | Partner

That is not normal or expected behavior for Poly or any IP phone. It sounds like you have some other network issue to resolve. Are the phones used or refurbished? Maybe they have configurations in them already and that would explain it? If they are new out of the box they should work fine without LLDP/CDP as long as there is DHCP giving it an IP address and nothing is blocking internet access allowing it to reach ZTP server to provision.

E

Eliot

Community Super Champion | Partner

according to poly support article, if poly phone does not received any vlan info, the phone should continue with boot process.

Utilizing or troubleshooting VLAN's with Polycom SoundStation IP, SoundPoint IP or VVX Business Media phones

another article talks about an issue with the switch that the phone was connected to.

Solved: Polycom VVX 250 "DHCP Failed", no network connecti... - Poly Community

i recently got a poly vvx 450 and plugged it into my home network without any vlans and it worked fine.

thanks

eliot

BoyanAuthor

Explorer

@Eliot Thank you - I've seen this article about pvid and his 3COM fix, we're not talking about such use case - no VLANs, etc - we're talking about a use case exactly such as the one you just described - what worked for you doesn't for me - plug it into a switch with zero VLAN configuration - take your pick, the cheapest non-managed Link Sys switch in a home network - it doesn't work. The symptom is identical to the Poly post but the underlying cause is clearly different. This is why it's so hard to get a coherent response, even from support. Grasping for straws is the way support is done these days so I'll be stuck with the double cost of Cisco phones, for now, it's still an open issue.

Quick edit: I have a fix but it's not available to us; we have zero capacity to be performing manual tasks. The fix is to disable LLDP and CDP, of course to do that you first need to change admin password (out of the box step) so basically 4 steps (including save settings and reboot); then it works just fine in a non-managed, non-VLAN network

E

Eliot

Community Super Champion | Partner

the flow chart shows if there is no vlan, skip trying to get vlan info.

poly vvx x50 desk phones have a relatively new hardware upgrade that requires different firmware. maybe the firmware on your poly desk phones is for the wrong hardware.

my vvx 450 has the new hardware and has firmware 6.4.3.5059. please see the poly config change notice which tells you how to identify poly phones with the new hardware revision and what firmware is required:

Poly VVX June 2022 Product Shipping Configuraturation Change Notice - Rev E

thanks,

eliot

E

Eliot

Community Super Champion | Partner

you are probably right about your issue being something brand new.

the release notes for 6.4.3 do not mention your issue as a known issue.

Poly UC Software 6.4.3 B Release Notes

the release notes for 6.4.4 do not mention the issue you are experiencing as fixed or known issues.

Poly UC Software 6.4.4 Release Notes

maybe the answer is to return these vvx 250 phones that will not boot up to your disributor or dealer.

thanks,

eliot

E

enielsen

Contributor I

Yep, I've never seen this issue with Polycom phones, but the most recent I've used is a VVX411.

BoyanAuthor

Explorer

@enielsen Poly support is very close to acknowledging the issue, but so what, yah I get an easy RMA and then what - 5 days lost with incoherent convos and double the money, cuz no way I'm replacing those with more Poly devices - that vendor has reached the end of the line with us...

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