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PPP multilink input and output drops

wrkemmer
Level 1
Level 1

I recently bonded two T1 circuits together using ppp multilink. I am now seeing the following output from a "show interface" command:

sh int multi 1

Multilink1 is up, line protocol is up

Hardware is multilink group interface

Internet address is xx.xx.xx.xx/30

MTU 1500 bytes, BW 3072 Kbit, DLY 100000 usec,

reliability 255/255, txload 23/255, rxload 51/255

Encapsulation PPP, loopback not set

Keepalive set (10 sec)

DTR is pulsed for 2 seconds on reset

LCP Open, multilink Open

Open: IPCP

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

Last clearing of "show interface" counters 2w4d

Input queue: 0/75/9694/0 (size/max/drops/flushes); Total output drops: 50009

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 626000 bits/sec, 114 packets/sec

5 minute output rate 287000 bits/sec, 100 packets/sec

87684828 packets input, 3279383743 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

73717007 packets output, 1127256732 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 output buffer failures, 0 output buffers swapped out

0 carrier transitions

How do I interpret this line?

Input queue: 0/75/9694/0 (size/max/drops/flushes); Total output drops: 50009

It seems to indicate both input and output drops, but I'm not sure I'm reading this right. Also, should I adjust input or output queue size to help fix the problem?

Thanks for any suggestions.

1 Reply 1

smif101
Level 4
Level 4

I would clear the counters first and then look how often you take drops. There isn't anything in the queue when you did this command and there is a resonable load on the interface. Check out this page if you are still getting drops afer the counters are cleared.

http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a0080094791.shtml

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