We have a circuit that is having pretty severe problems. No errors are being seen at
the router serial interface, but we are experiencing about 50% packet loss (500 byte
packets) incoming. I've just noticed something else that is odd. For each incoming
LMI response, the number of received broadcasts increments.
Serial0 is up, line protocol is up
Hardware is HD64570
Description: 24.YBGA.xxxxxx
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 2/255
Encapsulation FRAME-RELAY, loopback not set, keepalive set (10 sec)
LMI enq sent 235, LMI stat recvd 218, LMI upd recvd 0, DTE LMI up
LMI enq recvd 0, LMI stat sent 0, LMI upd sent 0
LMI DLCI 1023 LMI type is CISCO frame relay DTE
Broadcast queue 0/64, broadcasts sent/dropped 1135/0, interface broadcasts 1018
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 00:39:18
Input queue: 1/75/0 (size/max/drops); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/23/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
5 minute input rate 17000 bits/sec, 7 packets/sec
5 minute output rate 14000 bits/sec, 9 packets/sec
20505 packets input, 5242248 bytes, 0 no buffer
Received 218 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
26000 packets output, 5145390 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up
Because some keepalives are being missed, does that cause the frame switch to change
the way it sends them? I couldn't find any other example of LMI keepalives causing
the broadcast counters to increase, and I checked this on interfaces using both Cisco
and ANSI LMI.
any ideas?
thanks,
John
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