Polycome phone does not get an IP with Cisco switch.

[kaushalparab]

Hi, 

"Polycom" phone connected to cisco switch - c4506 port does not get an IP . I'm using Microsoft DHCP.  below is the switch port configuration. lldp is configured on cicso switch. how to ensure the dhcp - "discover" packet is sending out to microsoft dhcp server?  Can anyone shed some light Pls? 

show run int gi2/4

switchport access vlan 84
switchport mode access
switchport voice vlan 112
switchport priority extend trust
switchport port-security maximum 4
switchport port-security aging time 10
switchport port-security aging type inactivity
storm-control broadcast include multicast
storm-control broadcast level 3.00
qos trust extend
ip dhcp snooping limit rate 10

-----------------------------

x15tax01#show run | i lldp
lldp run

------------------------------

x15tax01#show lldp interface gigabitEthernet 2/4

GigabitEthernet2/4:
Tx: enabled
Rx: enabled
Tx state: IDLE
Rx state: WAIT FOR FRAME

----------------------------------------

x15tax01#show interface gigabitEthernet 2/4 switchport
Name: Gi2/4
Switchport: Enabled
Administrative Mode: static access
Operational Mode: static access
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: native
Negotiation of Trunking: Off
Access Mode VLAN: 84 (VLAN0084)
Trunking Native Mode VLAN: 1 (default)
Administrative Native VLAN tagging: enabled
Voice VLAN: 112 (VLAN0112)
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk Native VLAN tagging: enabled
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk associations: none
Administrative private-vlan trunk mappings: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL

Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Appliance trust: trusted

[Georg Pauwen]

Hello,

how is the Windows DHCP server configured ? Polycom requires option 66, and if that is not available, falls back to option 160.

You also need to configure 'spanning-tree portfast' on the ports of the 4500

[kaushalparab]

yes ,  option 66 was configured. option 66/120/43 required for polycom phone but somehow it was not getting IP.   i reset "lldp run" cisco switch then phone got the IP. now its working fine :) . Thank you for your support. 

[Georg Pauwen]

Good to hear that you got it resolved...

[balaji.bandi]

First, you need to configure IP helper-address on Layer 3 interface for - ip helper-address (IP Address of DHCP Server)

Second, you need to configure DHCP Options: below example guide helps you :

https://www.3cx.com/sip-phones/dhcp-option-66/

[kaushalparab]

yes ,  option 66 was configured. option 66/120/43 required for polycom phone but somehow it was not getting IP.   i reset "lldp run" cisco switch then phone got the IP. now its working fine :) . Thank you for your support.