Ali.Essa wrote

Dears,

 

we having switches JetStream 24-Port Gigabit Smart PoE Switch with 4 SFP Slots (T1600G-28PS 1.0) and we enabled the voice vlan to pass voice and data in same port. we are using Avaya phones, after the configuration every thing working fine but after one to two days the LLDP in the Tp-link seem to be become idle and it is not able to discover the phone by LLDP ( the voice servcie become down ) we have to disable the LLDP then enable it again in order to make the phone servcie working again...

 

any parameter need to be change to avaoid this issue?  

 

Thanks. 

Hi Ali.Essa

I think you also can configure the OUI of voice vlan, add the avaya OUI. The switch should be able to identify the OUI and add the port to voice VLAN.

Hi Andone,

Thanks for your reply..

we already added Avaya OUI, but the issue every time i need to restart the LLDP service in the TP-link SW.

Hi

If you only connect the IP phone to the switch, you can try to use manual mode, I think you don't need to configure LLDP in this mode. 

LLDP will tell your IP phone which VLAN should use and identify the voice devices. If you cannot set up VLAN for IP phone, use Voice VLAN maunal mode on switch and set up untagged port/ PVID for the port connected to IP phone.

Hi,

the below is our port config. ( Vlan 200 is for the voice and Vlan 10 for the data)

interface gigabitEthernet 1/0/12
  switchport general allowed vlan 10 untagged
  switchport general allowed vlan 200 tagged
  no switchport general allowed vlan 1
  switchport pvid 10
  lldp med-status
  lldp snmp-trap
  qos 7
  ip dhcp snooping limit rate 25
  ip dhcp snooping decline rate 25
  ip dhcp snooping information option
  spanning-tree
  spanning-tree common-config portfast enable
  spanning-tree guard loop
  spanning-tree guard root

  switchport voice vlan mode manual
  switchport voice vlan security
#

voice vlan mac-address c8:1f:ea:00:00:00 mask ff:ff:ff:00:00:00 description "Avaya3"

voice vlan 200

 switchport voice vlan mode manual

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with the above config, the phone service will be discounted after one day and the phone will be out of service, however if i disable then enable the LLDP the phone will connect again.

Probably, tp-link switch doesn't support some TLVs and it somehow affect the lldp work.

I advice you to check statistics of LLDP at the problem moment, like, if LLDP counters increase, etc. Get dumps at this moment and send it to tplink tech.support.

Hi

As Mitya said, you can check the LLDP statistics when problem happens, then you can know that whether the LLDP communication is still exist. You also can capture the packets to confirm it. 

If there is any problem, suggest to feedback to TP-Link Support.