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phone stating in LLDP that it is half duplex
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mikes Offline
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Post: #1
phone stating in LLDP that it is half duplex
I have issues with T4X series phones showing in their LLDP they send to the Ethernet switch that they are half duplex. Both the phones WAN port and the Ethernet switch are set for Auto Negotiate. I see the same in the LLDP if both the phone and the Ethernet switch are set to 100 M full duplex. The phone I tested with is a T41P Firmware Version 36.71.19.6 and Hardware Version 36.0.0.0.0.0.0. I am troubleshooting a delay audio issue and want to clear up this apparent mismatch so as to eliminate it being the cause.

Here is the output of the switches debug of LLDP.

2015.04.15 04:01:42 : LLDP: giga-swx 0/19: RX LLDPDU from 00:0A:6B:03:B3:E1 len
= 198
2015.04.15 04:01:42 : LLDP: Chassis ID (Network Address) "192.168.21.125"
2015.04.15 04:01:42 : LLDP: Port ID (MAC Address) "00:0A:6B:03:B3:E1"
2015.04.15 04:01:42 : LLDP: Neighbor Port ID: 00:0A:6B:03:B3:E1 on
2015.04.15 04:01:42 : LLDP: TTL 180
2015.04.15 04:01:42 : LLDP: System Name "T4X_SPI"
2015.04.15 04:01:42 : LLDP: System Description "36.71.19.6"
2015.04.15 04:01:42 : LLDP: System Capabilities:
Bridge, Router, Telephone
Enabled System Capabilities:
Bridge, Telephone
2015.04.15 04:01:42 : LLDP: Port Description "WAN PORT"
2015.04.15 04:01:42 : LLDP: Negotiation Status: "enabled"
LLDP: Speed/Duplex: "100M/half-duplex"
2015.04.15 04:01:42 : LLDP: LLDP-MED Capabilities:
Other, Repeater, Router, Telephone
LLDP: Application/VLAN ID/CoS/DSCP: Voice/4/5/46 (tagged)

2015.04.15 04:01:42 LLDP LLDP: Speed Duplex mis-match on giga-swx 0/19. Speed/D
uplex: "100M/full-duplex" Neighbor Speed/Duplex: "100M/half-duplex"
04-15-2015 08:29 PM
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Messages In This Thread
phone stating in LLDP that it is half duplex - mikes - 04-15-2015 08:29 PM

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