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MLPPP Queue and input error problems

I am doing a 4x4 multilink from 2651 to a 2651 over slow, long latency satellite modem links. I've noticed that I'm starting to get overruns on the lines, which correlate to no buffers, drops on the input queue and hence the same amount of input errors. I'm doing simple FTP transfers across the links... Here is some sample output from the show commands... Any ideas on how to fix this?

TIA,

Doug

Tty Typ Tx/Rx A Modem Roty AccO AccI Uses Noise Overruns Int

0 CTY - - - - - 1 12 0/0 -

Ready

A 33 TTY 19200/19200 - inout - - - 9 0 0/1023381 -

Ready

34 TTY 19200/19200 - inout - - - 15 0 0/697290 -

Idle

A 35 TTY 19200/19200 - inout - - - 7 0 0/2621892 -

Ready

36 TTY 19200/19200 - inout - - - 32 0 0/1186640 -

spo-iridium-dgw1#sh buffer

Buffer elements:

495 in free list (500 max allowed)

52354783 hits, 0 misses, 0 created

Public buffer pools:

Small buffers, 104 bytes (total 50, permanent 50):

50 in free list (20 min, 150 max allowed)

132805 hits, 0 misses, 0 trims, 0 created

0 failures (0 no memory)

Middle buffers, 600 bytes (total 40, permanent 25, peak 124 @ 2d01h):

34 in free list (10 min, 150 max allowed)

54574 hits, 144 misses, 362 trims, 377 created

0 failures (0 no memory)

Big buffers, 1536 bytes (total 50, permanent 50, peak 234 @ 1d01h):

43 in free list (5 min, 150 max allowed)

40575 hits, 177 misses, 523 trims, 523 created

0 failures (0 no memory)

VeryBig buffers, 4520 bytes (total 10, permanent 10):

10 in free list (0 min, 100 max allowed)

0 hits, 0 misses, 0 trims, 0 created

0 failures (0 no memory)

Large buffers, 5024 bytes (total 0, permanent 0):

0 in free list (0 min, 10 max allowed)

0 hits, 0 misses, 0 trims, 0 created

0 failures (0 no memory)

Huge buffers, 18024 bytes (total 0, permanent 0):

0 in free list (0 min, 4 max allowed)

0 hits, 0 misses, 0 trims, 0 created

0 failures (0 no memory)

Interface buffer pools:

Async33 buffers, 1504 bytes (total 4, permanent 4):

0 in free list (0 min, 4 max allowed)

4 hits, 0 fallbacks

4 max cache size, 2 in cache

13013 hits in cache, 1211584 misses in cache

Async34 buffers, 1504 bytes (total 4, permanent 4):

0 in free list (0 min, 4 max allowed)

4 hits, 0 fallbacks

4 max cache size, 2 in cache

15985 hits in cache, 16424479 misses in cache

Async35 buffers, 1504 bytes (total 4, permanent 4):

0 in free list (0 min, 4 max allowed)

4 hits, 1 fallbacks

4 max cache size, 2 in cache

27413 hits in cache, 2938969 misses in cache

Async36 buffers, 1504 bytes (total 4, permanent 4):

0 in free list (0 min, 4 max allowed)

4 hits, 0 fallbacks

4 max cache size, 2 in cache

11574 hits in cache, 5311054 misses in cache

CD2430 I/O buffers, 1536 bytes (total 160, permanent 160):

0 in free list (0 min, 160 max allowed)

160 hits, 0 fallbacks

Header pools:

Header buffers, 0 bytes (total 137, permanent 128, peak 137 @ 4d02h):

9 in free list (10 min, 512 max allowed)

125 hits, 3 misses, 0 trims, 9 created

0 failures (0 no memory)

128 max cache size, 128 in cache

4743 hits in cache, 0 misses in cache

Particle Clones:

1024 clones, 8106 hits, 0 misses

Public particle pools:

F/S buffers, 256 bytes (total 384, permanent 384):

128 in free list (128 min, 1024 max allowed)

256 hits, 0 misses, 0 trims, 0 created

0 failures (0 no memory)

256 max cache size, 256 in cache

8105 hits in cache, 0 misses in cache

Normal buffers, 1548 bytes (total 512, permanent 512):

320 in free list (128 min, 1024 max allowed)

256 hits, 0 misses, 0 trims, 0 created

0 failures (0 no memory)

128 max cache size, 128 in cache

0 hits in cache, 0 misses in cache

Private particle pools:

FastEthernet0/0 buffers, 1548 bytes (total 192, permanent 192):

0 in free list (0 min, 192 max allowed)

192 hits, 0 fallbacks

192 max cache size, 128 in cache

77891 hits in cache, 0 misses in cache

FastEthernet0/1 buffers, 1548 bytes (total 192, permanent 192):

0 in free list (0 min, 192 max allowed)

192 hits, 0 fallbacks

192 max cache size, 192 in cache

0 hits in cache, 0 misses in cache

spo-iridium-dgw1#sh int async 33

Async33 is up, line protocol is up

Hardware is CD2430 in async mode

MTU 505 bytes, BW 2 Kbit, DLY 100000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation PPP, LCP Open, multilink Open, loopback not set

DTR is pulsed for 5 seconds on reset

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

Last clearing of "show interface" counters 1d02h

Input queue: 0/75/1023381/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 1/10 (size/max)

5 minute input rate 0 bits/sec, 1 packets/sec

5 minute output rate 0 bits/sec, 1 packets/sec

3492 packets input, 159146 bytes, 1023381 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 1023381 throttles

1023388 input errors, 7 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

3642 packets output, 164448 bytes, 0 underruns

0 output errors, 0 collisions, 12 interface resets

0 output buffer failures, 0 output buffers swapped out

0 carrier transitions

spo-iridium-dgw1#sh int async 34

Async34 is up, line protocol is up

Hardware is CD2430 in async mode

MTU 505 bytes, BW 2 Kbit, DLY 100000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation PPP, LCP Open, multilink Open, loopback not set

DTR is pulsed for 5 seconds on reset

Last input 00:00:02, output 00:00:00, output hang never

Last clearing of "show interface" counters 1d02h

Input queue: 8/75/697290/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 1/10 (size/max)

5 minute input rate 0 bits/sec, 1 packets/sec

5 minute output rate 0 bits/sec, 1 packets/sec

6141 packets input, 273601 bytes, 697290 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 697290 throttles

697371 input errors, 81 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

5556 packets output, 248461 bytes, 0 underruns

0 output errors, 0 collisions, 23 interface resets

0 output buffer failures, 0 output buffers swapped out

0 carrier transitions

spo-iridium-dgw1#sh int async 35

Async35 is up, line protocol is up

Hardware is CD2430 in async mode

MTU 505 bytes, BW 2 Kbit, DLY 100000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation PPP, LCP Open, multilink Open, loopback not set

DTR is pulsed for 5 seconds on reset

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

Last clearing of "show interface" counters 1d02h

Input queue: 1/75/2621892/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 1/10 (size/max)

5 minute input rate 0 bits/sec, 2 packets/sec

5 minute output rate 0 bits/sec, 1 packets/sec

11226 packets input, 528581 bytes, 2621892 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 2621892 throttles

2621923 input errors, 31 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

6985 packets output, 308083 bytes, 0 underruns

0 output errors, 0 collisions, 12 interface resets

0 output buffer failures, 0 output buffers swapped out

0 carrier transitions

spo-iridium-dgw1#sh int async 36

Async36 is down, line protocol is down

Hardware is CD2430 in async mode

MTU 505 bytes, BW 2 Kbit, DLY 100000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation PPP, LCP Closed, multilink Closed

Closed: BACP, loopback not set

DTR is pulsed for 5 seconds on reset

Last input 00:02:38, output 00:02:38, output hang never

Last clearing of "show interface" counters 1d02h

Input queue: 0/75/1186640/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/10 (size/max)

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

3227 packets input, 142272 bytes, 1186640 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 1186640 throttles

1186649 input errors, 9 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

2848 packets output, 122474 bytes, 0 underruns

0 output errors, 0 collisions, 37 interface resets

0 output buffer failures, 0 output buffers swapped out

0 carrier transitions

1 REPLY
Bronze

Re: MLPPP Queue and input error problems

I guess you can try for framention option in the Point to point link as you say the link is very slow.

That would limit the no of overruns

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