high volume of output drops on PA-E3, VIP4-50, 7513

mozolik33 · ‎12-20-2007

Hi All,

we are registering a lot of output drops on ATM E3 interface, the same number of drops is identified as packets late drop. There are no any drops on any subinterface on atm vc level. As you can see the volume of output traffic is low. It is ATM PA-E3 module in VIP4-50 on 7513 series router. Do you have any idea, why the amout of output drops is up to 10% of total amount of output packets, what's (and why) it's happening?

R1#sh int atm 8/1/0

ATM8/1/0 is up, line protocol is up

Hardware is cyBus ENHANCED ATM PA

Description: To_ATM_switch

MTU 4470 bytes, sub MTU 4470, BW 33920 Kbit, DLY 200 usec,

reliability 255/255, txload 2/255, rxload 53/255

Encapsulation ATM, loopback not set

Encapsulation(s): AAL5

4095 maximum active VCs, 15 current VCCs

VC Auto Creation Disabled.

VC idle disconnect time: 300 seconds

0 carrier transitions

Last input 00:00:00, output 00:00:00, output hang never

Last clearing of "show interface" counters 02:42:45

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 289839

Queueing strategy: Class-based queueing

Output queue: 0/40 (size/max)

30 second input rate 7133000 bits/sec, 700 packets/sec

30 second output rate 378000 bits/sec, 531 packets/sec

3747175 packets input, 3759549860 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

3050881 packets output, 624861789 bytes, 0 underruns

289839 packets late drop, 28441753 bytes late drop

0 output errors, 0 collisions, 0 interface resets

0 output buffer failures, 0 output buffers swapped out

R1#sh atm vc int atm 8/1/0 de | i Drop

InPktDrops: 0, OutPktDrops: 0

Thank You for any comments

JM.,

Danilo Dy · ‎12-21-2007

Hi,

Report this to your line service provider.

Check this link http://www.cisco.com/warp/public/121/atmdrops2.html

Regards,

Dandy