We have a Cisco 3750 running C3750 Software (C3750-IPBASE-M), Version 12.2(25)SEE2, RELEASE SOFTWARE (fc1). We have a lot of voice traffice passing through this switch and through sniffing we can see that it is dropping a lots of RTP packets. It is pretty basic configured - no QoS etc defined, no DSCP, WRED etc
We have been looking on the interfaces:
#sh int gi 1/0/7
GigabitEthernet1/0/7 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 001b.2b3e.a807 (bia 001b.2b3e.a807)
MTU 9000 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 10/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, media type is 10/100/1000BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:17, 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
You may get more traction on this one in the switching forum. Since you know you have drops, it's not a voice specific issue and the issue is related to the switch queues/QoS, and the issue needs to be looked at from a 3750 packet dropping perspective.
Well - I am not sure on how to interpret the output of "show buffers" - since the Cat is dropping RTP packets in transistion (no packets missing before the switch and missing RTP packets after) I would expect to find somewhere where it is low on buffers - and the only buffers I can find which shos "something" are these RxQ8 & RxQ15 buffers which seems to be pretty exhausted.
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