Hi Guys,
My company is using IPT phones model CP-7821
For the past 2 weeks we've been noticing some strange behaviors with certain phones...Once plugged they display "Network Unavailable" and if we take a look into the switch interface and keeps changing from up to down (connected/notconnect). All phones a part of voice VLAN
Strangely, when we connect a regular laptop to the switch-port it works like a charm...we are able to surf the web and use all domain services. We tested different Phones on the same port and the outcome is the same. Switches are POE enabled
#show interfaces fa1/0/17
FastEthernet1/0/17 is up, line protocol is up (connected)
Hardware is Fast Ethernet, address is 1c1d.8680.8011 (bia 1c1d.8680.8011)
Description: BTNM
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, media type is 10/100BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 1000 bits/sec, 1 packets/sec
13088 packets input, 1580939 bytes, 0 no buffer
Received 316 broadcasts (133 multicasts)
0 runts, 0 giants, 0 throttles
1 input errors, 1 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 133 multicast, 0 pause input
0 input packets with dribble condition detected
27444 packets output, 31395950 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out
#show interfaces fa1/0/17 switchport
Name: Fa1/0/17
Switchport: Enabled
Administrative Mode: static access
Operational Mode: down
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: Off
Access Mode VLAN: 2 (BIN:Users)
Trunking Native Mode VLAN: 1 (default)
Administrative Native VLAN tagging: enabled
Voice VLAN: 900 (VLAN0900)
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
Protected: false
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Appliance trust: trusted
#show interfaces fa1/0/17 status
Port Name Status Vlan Duplex Speed Type
Fa1/0/17 BTNM notconnect 2 auto auto 10/100BaseTX
Port Name Status Vlan Duplex Speed Type
Fa1/0/17 BTNM notconnect 2 auto auto 10/100BaseTX
MOZMAP3006#show interfaces fa1/0/17 status
Port Name Status Vlan Duplex Speed Type
Fa1/0/17 BTNM connected 2 a-full a-100 10/100BaseTX
MOZMAP3006#show interfaces fa1/0/17 status
Port Name Status Vlan Duplex Speed Type
Fa1/0/17 BTNM notconnect 2 auto auto 10/100BaseTX
MOZMAP3006#show interfaces fa1/0/17 status
Port Name Status Vlan Duplex Speed Type
Fa1/0/17 BTNM notconnect 2 auto auto 10/100BaseTX
