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New Member

FRATM problem

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...

New Member

Re: FRATM problem

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


.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


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

frame-relay class frclass

frame-relay interface-dlci 17

load-interval 30



.#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

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