[YMCS/YDMP Free Trial Program]Yealink would like to offer Free Trial Program of Yealink device management service for our current eligible customers. You can see the details below.

Post Reply 
Thread Rating:
  • 0 Votes - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
LLDP incompatibility between T28 and Cisco SG300-52P
Author Message
Japmac13 Offline
Junior Member

Posts: 1
Joined: Mar 2015
Reputation: 0
Post: #1
LLDP incompatibility between T28 and Cisco SG300-52P
Good morning,

We have recently purchased Yealink T-28 phones that do not seem to be working with LLDP when we plug them in to our Cisco SG300 switches.

We tried updating to the firmware on both phone and switch in a test environment and get the same issue in that the VLAN is not configured on the phone.

The phone details are as follows:
Yealink T-28P
Hardware version is

Switch details are:
Cisco SG300-52P
Firmware Version 1.4.088

As I say we have tried updating firmware on both in a test environment with no luck.

Any older Yealink T-28 phones work with no issue and are assigned the correct VLAN
Known working phone:

Firmware Version
Hardware version is

We have downgraded the firmware on the phone that was not working and can confirm that this works with the latest Cisco firmware.

Is this a known issue and will this be fixed in upcoming firmware?

Ideally we do not want to have to downgrade firmware of all new Yealink T-28 phones we purchase.

If anybody has any ideas or knows of known problems with the latest firmware, then any suggestions would be much appreciated.

I did try raising this with techsupport at Yealink but they are being a little slow at getting back to me.
03-17-2015 09:45 PM
Find all posts by this user    like0    dislike0 Quote this message in a reply
Post Reply 

Messages In This Thread
LLDP incompatibility between T28 and Cisco SG300-52P - Japmac13 - 03-17-2015 09:45 PM

Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  Yealink T42S with LLDP rhap4boy 0 3,808 07-29-2021 02:39 AM
Last Post: rhap4boy
  Yealink WH62 UC not working with Cisco Webex oliragg 0 4,633 05-10-2021 05:18 PM
Last Post: oliragg
  LLDP advertisement of ELIN mikes 6 14,688 12-27-2019 01:38 PM
Last Post: complex1
  Yealink T48S and Cisco Unified Communications Manager (CUCM) aka:Call Manager AAP1811 1 11,200 02-13-2019 07:46 PM
Last Post: jolouis
  T46G IP Phone with cisco 2960 switch VLAN kongi 1 9,038 02-17-2016 11:18 AM
Last Post: Karl_Yealink
  Cisco CallManager Account for Yealink phone 74HC244 3 37,310 11-03-2015 02:42 AM
Last Post: martinezaek
  phone stating in LLDP that it is half duplex mikes 10 32,496 08-26-2015 09:45 PM
Last Post: James_Yealink
  PC Port will not pass DHCP when connected to Cisco Switch BeachTech 5 20,602 12-04-2014 09:04 AM
Last Post: James_Yealink
  Function of Cisco 3650 Switch Keren01 1 10,634 09-24-2014 03:18 PM
Last Post: James_Yealink
  Which cisco switches for small business Keren01 3 14,751 08-30-2014 03:57 AM
Last Post: tsukraw

Forum Jump:

User(s) browsing this thread:

Contact Us   Yealink   Return to Top   Return to Content   Lite (Archive) Mode   RSS Syndication