05-23-2007 03:04 PM - edited 03-03-2019 05:07 PM
Hi all,
Over the past two weeks our network has been experiencing sluggish intermittent problems with a Frame over ATM circuit.
Nothing has been changed from our side, and the fault only occurs every day or to during peak business hours. I've checked, and doublechecked all the interfaces and usual places, but they all look fine. The carrier has been contacted, and its beeen flagged with their level 3 team. Looks OK.
When the problem occurs, any traffic across the link starts to experience packet loss, high latency etc. EIGRP neighbors don't drop, and the backup ISDN circuit doesn't trip.
Can anyone suggest a possible cause? Although the frame stats don't show it(DE packets), to me it sounds like our carrier is oversubscribed...
05-23-2007 03:05 PM
interface Serial0/2/0
description 1984k Carrier FR
bandwidth 1984
no ip address
encapsulation frame-relay IETF
ip route-cache flow
load-interval 30
no fair-queue
frame-relay traffic-shaping
frame-relay lmi-type ansi
end
.sh frame-relay lmi
LMI Statistics for interface Serial0/2/0 (Frame Relay DTE) LMI TYPE = ANSI
Invalid Unnumbered info 0Invalid Prot Disc 0
Invalid dummy Call Ref 0Invalid Msg Type 0
Invalid Status Message 0Invalid Lock Shift 0
Invalid Information ID 0Invalid Report IE Len 0
Invalid Report Request 0Invalid Keep IE Len 0
Num Status Enq. Sent 64925Num Status msgs Rcvd 64925
Num Update Status Rcvd 0Num Status Timeouts 0
Last Full Status Req 00:00:09Last Full Status Rcvd 00:00:09
.sh frame-relay lmi pvc
PVC Statistics for interface Serial0/2/0 (Frame Relay DTE)
Active Inactive Deleted Static
Local 1 0 0 0
Switched 0 0 0 0
Unused 0 0 0 0
DLCI = 17, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/2/0.17
input pkts 15117343 output pkts 18011560 in bytes 227485058
out bytes 1914236194 dropped pkts 0 in pkts dropped 0
out pkts dropped 222 out bytes dropped 225793
late-dropped out pkts 222 late-dropped out bytes 225793
in FECN pkts 0 in BECN pkts 0 out FECN pkts 0
out BECN pkts 0 in DE pkts 0 out DE pkts 0
out bcast pkts 151140 out bcast bytes 12854334
30 second input rate 297000 bits/sec, 100 packets/sec
30 second output rate 49000 bits/sec, 87 packets/sec
pvc create time 22w0d, last time pvc status changed 2w3d
.sh frame-relay int s0/2/0.17
interface Serial0/2/0.17 point-to-point
description 1024k Carrier FR
bandwidth 1024
ip address 0.0.0.0 255.255.255.252
frame-relay class frclass
frame-relay interface-dlci 17
load-interval 30
end
.
.#sh int s0/2/0
Serial0/2/0 is up, line protocol is up
Hardware is GT96K Serial
Description: 1984k Carrier FR
MTU 1500 bytes, BW 1984 Kbit, DLY 20000 usec,
reliability 255/255, txload 6/255, rxload 19/255
Encapsulation FRAME-RELAY IETF, loopback not set
Keepalive set (10 sec)
LMI enq sent 64972, LMI stat recvd 64972, LMI upd recvd 0, DTE LMI up
LMI enq recvd 0, LMI stat sent 0, LMI upd sent 0
LMI DLCI 0 LMI type is ANSI Annex D frame relay DTE
FR SVC disabled, LAPF state down
Broadcast queue 0/64, broadcasts sent/dropped 151247/0, interface broadcasts 140418
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 1w0d
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 222
Queueing strategy: fifo
Output queue: 0/40 (size/max)
30 second input rate 153000 bits/sec, 76 packets/sec
30 second output rate 49000 bits/sec, 93 packets/sec
15212685 packets input, 236145813 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
4 input errors, 4 CRC, 1 frame, 0 overrun, 0 ignored, 1 abort
18109241 packets output, 1917272889 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
.
.1#sh int s0/2/0.17
Serial0/2/0.17 is up, line protocol is up
Hardware is GT96K Serial
Description: 1024k Carrier FR
Internet address is 0.0.0.0/30
MTU 1500 bytes, BW 1024 Kbit, DLY 20000 usec,
reliability 255/255, txload 4/255, rxload 12/255
Encapsulation FRAME-RELAY IETF
Last clearing of "show interface" counters never
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