06-25-2007 01:05 PM - edited 03-03-2019 05:36 PM
I am experiencing many packets drop when I configure interface Multilink with only one physical link.The hardware is 7606 with SUP32 and IOS version 12.2(18)SXF9.I don?t have packet drop when configure IP Address in the physical link (no MLPPP in use).In the output below, you can see that the drops occur in the Multilink interface, in the physical interface I don?t have drops.
The drops occur in the input direction. In the other end has no drops.
A#ping 1.1.1.2 repeat 100
Type escape sequence to abort.
Sending 100, 100-byte ICMP Echos to 1.1.1.2, timeout is 2 seconds:
!!!!!.!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!
.!!!!!!!!!!!!!!!!!.!!!!!!!!!!!
Success rate is 94 percent (94/100), round-trip min/avg/max = 4/13/216 ms
!
!
!
A#sh int mu1
Multilink1 is up, line protocol is up
Hardware is multilink group interface
Internet address is 1.1.1.1/30
MTU 1500 bytes, BW 155000 Kbit, DLY 100000 usec,
reliability 255/255, txload 1/255, rxload 1/255
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 00:00:25, output never, output hang never
Last clearing of "show interface" counters 00:01:47
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
94 packets input, 9776 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
100 packets output, 10400 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
!
POS2/1/0 is up, line protocol is up
Hardware is Packet over Sonet
Description: Backbone: <removed>
MTU 1500 bytes, BW 155000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation PPP, crc 32, loopback not set
Keepalive set (10 sec)
Scramble disabled
LCP Open, multilink Open
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 00:01:38
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
113 packets input, 10608 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 parity
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
113 packets output, 10608 bytes, 0 underruns
0 output errors, 0 applique, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
06-25-2007 01:06 PM
Cont.
B#sh int mu 1
Multilink1 is up, line protocol is up
Hardware is multilink group interface
Internet address is 1.1.1.2/30
MTU 1500 bytes, BW 155000 Kbit, DLY 100000 usec,
reliability 255/255, txload 1/255, rxload 1/255
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 00:01:12, output never, output hang never
Last clearing of "show interface" counters 00:01:44
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
100 packets input, 10400 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
100 packets output, 10400 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
!
!
!
POS2/0/0 is up, line protocol is up
Hardware is Packet over Sonet
Description: Backbone :
MTU 1500 bytes, BW 155000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation PPP, crc 32, loopback not set
Keepalive set (10 sec)
Scramble disabled
LCP Open, multilink Open
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 00:02:12
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
121 packets input, 10736 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 parity
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
121 packets output, 10736 bytes, 0 underruns
0 output errors, 0 applique, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
06-25-2007 02:37 PM
Hello,
can you execute the same diagnostics on the other ends? The fact that you are not receiving the ping reply may mean that the remote has not received the request.
Also I would try a ping "across" the devices to see if it happens with locally generated packets only, or with carried traffic as well.
06-26-2007 04:44 AM
Hello,
Yes, I executed the same diagnostics on the other end and occur the same behavior.
However, when I used two physical interfaces, the problem did not occur.
B#ping 1.1.1.1 repeat 100
Type escape sequence to abort.
Sending 100, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Success rate is 100 percent (100/100), round-trip min/avg/max = 4/6/24 ms
B#sh ppp mu
Multilink1, bundle name is
Bundle up for 00:08:16
0 lost fragments, 0 reordered, 0 unassigned
0 discarded, 0 lost received, 1/255 load
0x64 received sequence, 0x64 sent sequence
Member links: 2 active, 0 inactive (max not set, min not set)
PO2/0/1, since 00:08:16, last rcvd seq 000062
PO2/0/0, since 00:00:16, last rcvd seq 000063
06-26-2007 05:02 AM
Hello,
have you tried if if happens only when pinging from router to router, or also to devices connected to the routers, pinging each other ?
06-26-2007 05:08 AM
Hi,
I didn't try this test because I don't have authorization to execute it.
We have many services in these devices and I can't configure a route to these Multilink interfaces.
06-26-2007 05:19 AM
The thing is that even is possible that pings locally source from router to router can have an anomaly like these drops, that doesn't necessarily means the traffic carried across does suffer of the same problem.
So you should execute a test with external devices end-to-end to see if it happens as well.
In any case, even if you don't configure MLPPP, the router will lad balance over the two circuits and you should have no issues.
06-27-2007 05:27 AM
Hi
I believe that don't have support to MLPPP in STM1 interfaces.
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