Users are complaining that their PCs are slow when connected to the network through Cisco IP phone. Speed is regular when PC is plugged directly to the network switch. Access switches where IP phones are connected are mostly Cisco WS-C3560-48PS. Most of the phones are 7942G There is no local Call Manager. CCM is reachable over the MPLS. Latency less than 10ms
Any ideas what problem could be?
Access-SW01#sh run int Fas 0/16
interface FastEthernet0/16 switchport access vlan 128 switchport mode access switchport voice vlan 129 srr-queue bandwidth share 10 10 60 20 priority-queue out mls qos trust device cisco-phone mls qos trust cos auto qos voip cisco-phone spanning-tree portfast service-policy input AutoQoS-Police-CiscoPhone
Access-SW01#sh int Fas 0/16
FastEthernet0/16 is up, line protocol is up (connected) Hardware is Fast Ethernet, address is 0026.cad0.5792 (bia 0026.cad0.5792) MTU 1500 bytes, BW 100000 Kbit, 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 00:00:44, output 00:00:00, output hang never Last clearing of "show interface" counters 1y7w Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 5417 Queueing strategy: fifo Output queue: 0/0 (size/max) 5 minute input rate 1000 bits/sec, 1 packets/sec 5 minute output rate 7000 bits/sec, 8 packets/sec 83500725 packets input, 51399423374 bytes, 0 no buffer Received 1174461 broadcasts (850091 multicasts) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 850091 multicast, 0 pause input 0 input packets with dribble condition detected 304310331 packets output, 84586626038 bytes, 0 underruns 0 output errors, 0 collisions, 0 interface resets 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
interface Vlan128 - data vlan description Office VLAN ip address 10.81.128.2 255.255.255.0 ip helper-address 10.81.128.5 ip helper-address 10.80.140.35
! interface Vlan129 - voice vlan description IPT VLAN ip address 10.81.129.2 255.255.255.0 ip helper-address 10.81.128.5 ip helper-address 10.80.140.35
Have you checked on the phone side to see what it has negotiated with the PC, a common issue is when the wrong duplex is negotiated between the Phone and the PC.
A customer of ours recently resolved PC-Phone issues using PhoneView from UnifiedFX, the paid for product provides full endpoint management, however the free ITL Scanner also performs phone inventory, the data gathered includes a number of PC/Switch port CDP datapoint that should help to resolve this issue.
The free phone inventory functionality is included in the ITL Scanner:
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