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OUTPUT DROPS ON HSSI INTERFACE??? - REG

The following are the details:

7206 running IOS 12.0(21)S1 with a 2 Port HSSI Port Adapter in Simplex configuration. One port is for Uplink and the second one for the downlink. Frequently showing OUTPUT DROPS in spite of different queueing mechanisms applied. Encapsulation is FR ietf. Please throw some light on the cause of OUTPUT DROPS.

REGARDS

K. SADAGOPAN

4 REPLIES
Silver

Re: OUTPUT DROPS ON HSSI INTERFACE??? - REG

Output drops are the result of a congested interface (for example, the traffic rate on the outgoing interface can't accept all packets that should be sent out).

Here is a link showing why output drops happen and how to troubleshoot / minimize them. Without some specific interface "show commands" to see what type queuing you are using it's hard to say whats the exact problem.

http://www.cisco.com/warp/customer/63/queue_drops.html

Hope this helps your problem,

Don

New Member

Re: OUTPUT DROPS ON HSSI INTERFACE??? - REG

the scenario is different. the output of the *show interface* is printed below.

the output is on a simplex circuit which is basically a input interface. please advice.

regards

k. sadagopan

Hssi1/0 is up, line protocol is up

Hardware is M2T-HSSI-B

Description: *******************Satellite Downlink 45 Mbps ************

MTU 4470 bytes, BW 45045 Kbit, DLY 200 usec, rely 255/255, load 1/255

Encapsulation FRAME-RELAY IETF, crc 16, loopback not set

Keepalive not set

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

Last clearing of "show interface" counters 13:23:01

Queueing strategy: fifo

Output queue 40/40, 908 drops; input queue 0/75, 0 drops

30 second input rate 24628000 bits/sec, 12018 packets/sec

30 second output rate 0 bits/sec, 0 packets/sec

561631387 packets input, 1942234292 bytes, 0 no buffer

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

0 parity

3337 input errors, 3266 CRC, 0 frame, 48 overrun, 0 ignored, 23 abort

0 packets output, 0 bytes, 0 underruns

0 output errors, 0 applique, 0 interface resets

0 output buffer failures, 0 output buffers swapped out

8 carrier transitions LC=down CA=up TM=down LB=down TA=up LA=down

Silver

Re: OUTPUT DROPS ON HSSI INTERFACE??? - REG

Since this is only an downlink all outbound packets might just be dropped. I would think that these could be control packets (ospf/cdp/etc) getting dropped as well. Are you certain that all of these are turned off on this interface?

Since

Hope this helps you,

Don

Cisco Employee

Re: OUTPUT DROPS ON HSSI INTERFACE??? - REG

very intersting that you have 40/40 outqueue and, output rate 0 pkt/sec. Could you send us sho run int hss1/0?

Thanks,

Gopal

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