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DHCP/VLAN abnormalities on T4X compared to T21P
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AntonP Offline
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Post: #1
DHCP/VLAN abnormalities on T4X compared to T21P
Hi

I have been doing some extensive testing of T46G, T41P and T21P handsets and have noticed some inconsistencies.

Due to the nature of the network there are multiple DHCP servers, this is destined to change, but shouldnt cause a major issue.

We have 2 Vlans in our network, 1 is data 2 is voice.

Voice is 10.1.x.y (x being site, and y being the unit) and 1 being 172.16.x.y

On the T21p with auto provision we have the following happen.

Boots, gets IP from 172.16, gets auto provision information, applies Vlan
Reboots, gets IP from 10.1, keeps this IP.

However I have noticed for the T4X's this is not the case.
Instead it is

Boots, gets IP from 172.16, gets auto provision information, applies Vlan
Reboots, gets IP from 10.1, holds onto IP till expire, gets 172.16 IP.

This is with the following firmware
28.72.0.25 and 36.72.0.25 , and 34.72.0.20 for the relevant models

I have yet to do packet capture and analysis but from the above I would assume there is something.. abnormal happening.

I will be doing a packet capture to track down the exact issue.

Naturally this threw me a bit as I was using the t21P for the bulk of my testing.
(This post was last modified: 06-26-2014 02:53 PM by AntonP.)
06-26-2014 11:03 AM
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Yealink Support Offline
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Post: #2
RE: DHCP/VLAN abnormalities on T4X compared to T21P
Hi AntonP,

My colleague have received your mail. He will contact you.

thanks
06-26-2014 03:57 PM
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fabster Offline
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Post: #3
RE: DHCP/VLAN abnormalities on T4X compared to T21P
(06-26-2014 03:57 PM)Yealink Support Wrote:  Hi AntonP,

My colleague have received your mail. He will contact you.

thanks
hello,, i have the same issue.. the ip phone take well vlan data but when get vlan voice i cant access to the browser or make call. but settings says account registered fine.

help please.
08-08-2014 12:49 AM
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JAmatller Offline
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Joined: Oct 2014
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Post: #4
RE: DHCP/VLAN abnormalities on T4X compared to T21P
Hi,

I have the same problem with T42G.
All of them has 29.72.0.55 firmware and works OK in our LAN (172.1.x.x) with DHCP and autoprovisioning and without VLANs
But now I need to move all of them to a VLAN120.

When reboot, a 172.1.2.x IP address was given from LAN DHCP, also a url for provisioning: http://172.1.1.106/autop
This autop activates VLAN120 and gives SIP Account login info:
network.vlan.internet_port_enable = 1
network.vlan.internet_port_vid = 120

With this info, phone reboots again and a VLAN120 DHCP was found, and a new IP was given (172.16.1.100) even new url for provisioning intpo VLAN: http://172.16.1.1/autop
On this new url I have SIP Account login info.
And i can see url access to this VLAN Asterisk server

But... in few seconds it fails and reboot.
This time with LAN IP (172.1.2.x) but keeps VLAN120 enabled. ... It doesn't work!
10-22-2014 10:02 PM
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James_Yealink Offline
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Posts: 1,159
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Post: #5
RE: DHCP/VLAN abnormalities on T4X compared to T21P
Hi Jamatller,

Can you disable the LLDP feature and check again?
If the problem persist please try upgrading the V73.
http://forum.yealink.com/forum/announcements.php?aid=8

Regards,
James
10-23-2014 11:38 AM
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JAmatller Offline
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Post: #6
RE: DHCP/VLAN abnormalities on T4X compared to T21P
Thanks a lot, James!!

LLDP is enabled by default and our CISCO switch sent LLDP information to T42G
With a "network.lldp.enable = 0" the problem was solved!
10-23-2014 02:55 PM
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