From: gladston@br.ibm.com
Date: Mon Jul 25 2005 - 16:25:09 GMT-3
BC configured from the range of 640 to 15000 changes TC.
For any value bigger than 16000, TC goes back to 125ms.
Do you know if there is a logic behind this IOS behavior?
Cisco docs say: "Tc cannot exceed 125 ms", but if Bc is configured to 15000, while CIR is 64000, IOS displays Tc equal 234ms.
Do you thing this is a wrong result, and the correct value is 125ms?
These are the results:
Rack2R5(config-map-class)#fram bc 2000
Rack2R5(config-map-class)#do sh fram pvc 503
PVC Statistics for interface Serial0/0 (Frame Relay DTE)
DLCI = 503, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0
input pkts 5274 output pkts 6511 in bytes 537406
out bytes 578267 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
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 2146 out bcast bytes 214099
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 07:05:16, last time pvc status changed 07:04:53
cir 64000 bc 2000 be 0 byte limit 250 interval 31
mincir 32000 byte increment 248 Adaptive Shaping none
pkts 57 bytes 5025 pkts delayed 0 bytes delayed 0
shaping inactive
traffic shaping drops 0
Queueing strategy: fifo
Output queue 0/40, 0 drop, 0 dequeued
Rack2R5(config-map-class)#
Rack2R5(config-map-class)#fram bc 7000
Rack2R5(config-map-class)#do sh fram pvc 503
PVC Statistics for interface Serial0/0 (Frame Relay DTE)
DLCI = 503, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0
input pkts 5279 output pkts 6515 in bytes 537754
out bytes 578565 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
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 2146 out bcast bytes 214099
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 07:05:33, last time pvc status changed 07:05:11
cir 64000 bc 7000 be 0 byte limit 875 interval 109
mincir 32000 byte increment 872 Adaptive Shaping none
pkts 61 bytes 5323 pkts delayed 0 bytes delayed 0
shaping inactive
traffic shaping drops 0
Queueing strategy: fifo
Output queue 0/40, 0 drop, 0 dequeued
Rack2R5(config-map-class)#fram bc 8000
Rack2R5(config-map-class)#do sh fram pvc 503
PVC Statistics for interface Serial0/0 (Frame Relay DTE)
DLCI = 503, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0
input pkts 5279 output pkts 6516 in bytes 537754
out bytes 578623 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
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 2147 out bcast bytes 214157
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 07:05:43, last time pvc status changed 07:05:20
cir 64000 bc 8000 be 0 byte limit 1000 interval 125
mincir 32000 byte increment 1000 Adaptive Shaping none
pkts 62 bytes 5381 pkts delayed 0 bytes delayed 0
shaping inactive
traffic shaping drops 0
Queueing strategy: fifo
Output queue 0/40, 0 drop, 0 dequeued
Rack2R5(config-map-class)#fram bc 10000
Rack2R5(config-map-class)#do sh fram pvc 503
PVC Statistics for interface Serial0/0 (Frame Relay DTE)
DLCI = 503, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0
input pkts 5279 output pkts 6519 in bytes 537754
out bytes 578761 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
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 2149 out bcast bytes 214213
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 07:05:52, last time pvc status changed 07:05:29
cir 64000 bc 10000 be 0 byte limit 1250 interval 156
mincir 32000 byte increment 1248 Adaptive Shaping none
pkts 65 bytes 5519 pkts delayed 0 bytes delayed 0
shaping inactive
traffic shaping drops 0
Queueing strategy: fifo
Output queue 0/40, 0 drop, 0 dequeued
Rack2R5(config-map-class)#
Rack2R5(config-map-class)#
Rack2R5(config-map-class)#fram bc 64000
Rack2R5(config-map-class)#do sh fram pvc 503
PVC Statistics for interface Serial0/0 (Frame Relay DTE)
DLCI = 503, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0
input pkts 5282 output pkts 6522 in bytes 537978
out bytes 579236 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
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 2151 out bcast bytes 214600
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 07:06:09, last time pvc status changed 07:05:47
cir 64000 bc 64000 be 0 byte limit 1000 interval 125
mincir 32000 byte increment 1000 Adaptive Shaping none
pkts 68 bytes 5994 pkts delayed 0 bytes delayed 0
shaping inactive
traffic shaping drops 0
Queueing strategy: fifo
Output queue 0/40, 0 drop, 0 dequeued
Rack2R5(config-map-class)#fram bc 32000
Rack2R5(config-map-class)#do sh fram pvc 503
PVC Statistics for interface Serial0/0 (Frame Relay DTE)
DLCI = 503, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0
input pkts 5285 output pkts 6525 in bytes 538525
out bytes 579478 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
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 2151 out bcast bytes 214600
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 07:06:22, last time pvc status changed 07:05:59
cir 64000 bc 32000 be 0 byte limit 1000 interval 125
mincir 32000 byte increment 1000 Adaptive Shaping none
pkts 71 bytes 6236 pkts delayed 0 bytes delayed 0
shaping inactive
traffic shaping drops 0
Queueing strategy: fifo
Output queue 0/40, 0 drop, 0 dequeued
Rack2R5(config-map-class)#fram bc 16000
Rack2R5(config-map-class)#do sh fram pvc 503
PVC Statistics for interface Serial0/0 (Frame Relay DTE)
DLCI = 503, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0
input pkts 5288 output pkts 6526 in bytes 538749
out bytes 579566 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
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 2151 out bcast bytes 214600
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 07:06:33, last time pvc status changed 07:06:11
cir 64000 bc 16000 be 0 byte limit 1000 interval 125
mincir 32000 byte increment 1000 Adaptive Shaping none
pkts 72 bytes 6324 pkts delayed 0 bytes delayed 0
shaping inactive
traffic shaping drops 0
Queueing strategy: fifo
Output queue 0/40, 0 drop, 0 dequeued
Rack2R5(config-map-class)#fram bc 10000
Rack2R5(config-map-class)#do sh fram pvc 503
PVC Statistics for interface Serial0/0 (Frame Relay DTE)
DLCI = 503, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0
input pkts 5288 output pkts 6527 in bytes 538749
out bytes 579624 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
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 2152 out bcast bytes 214658
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 07:06:43, last time pvc status changed 07:06:21
cir 64000 bc 10000 be 0 byte limit 1250 interval 156
mincir 32000 byte increment 1248 Adaptive Shaping none
pkts 73 bytes 6382 pkts delayed 0 bytes delayed 0
shaping inactive
traffic shaping drops 0
Queueing strategy: fifo
Output queue 0/40, 0 drop, 0 dequeued
Rack2R5(config-map-class)#fram bc 11000
Rack2R5(config-map-class)#do sh fram pvc 503
PVC Statistics for interface Serial0/0 (Frame Relay DTE)
DLCI = 503, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0
input pkts 5291 output pkts 6532 in bytes 538935
out bytes 579898 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
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 2154 out bcast bytes 214714
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 07:06:55, last time pvc status changed 07:06:32
cir 64000 bc 11000 be 0 byte limit 1375 interval 171
mincir 32000 byte increment 1368 Adaptive Shaping none
pkts 78 bytes 6656 pkts delayed 0 bytes delayed 0
shaping inactive
traffic shaping drops 0
Queueing strategy: fifo
Output queue 0/40, 0 drop, 0 dequeued
Rack2R5(config-map-class)#
Rack2R5(config-map-class)#fram bc 12000
Rack2R5(config-map-class)#do sh fram pvc 503
PVC Statistics for interface Serial0/0 (Frame Relay DTE)
DLCI = 503, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0
input pkts 5293 output pkts 6533 in bytes 539061
out bytes 579946 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
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 2154 out bcast bytes 214714
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 07:07:04, last time pvc status changed 07:06:41
cir 64000 bc 12000 be 0 byte limit 1500 interval 187
mincir 32000 byte increment 1496 Adaptive Shaping none
pkts 79 bytes 6704 pkts delayed 0 bytes delayed 0
shaping inactive
traffic shaping drops 0
Queueing strategy: fifo
Output queue 0/40, 0 drop, 0 dequeued
Rack2R5(config-map-class)#
Rack2R5(config-map-class)#fram bc 13000
Rack2R5(config-map-class)#do sh fram pvc 503
PVC Statistics for interface Serial0/0 (Frame Relay DTE)
DLCI = 503, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0
input pkts 5293 output pkts 6535 in bytes 539061
out bytes 580333 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
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 2156 out bcast bytes 215101
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 07:07:12, last time pvc status changed 07:06:50
cir 64000 bc 13000 be 0 byte limit 1625 interval 203
mincir 32000 byte increment 1624 Adaptive Shaping none
pkts 81 bytes 7091 pkts delayed 0 bytes delayed 0
shaping inactive
traffic shaping drops 0
Queueing strategy: fifo
Output queue 0/40, 0 drop, 0 dequeued
Rack2R5(config-map-class)#fram bc 14000
Rack2R5(config-map-class)#do sh fram pvc 503
PVC Statistics for interface Serial0/0 (Frame Relay DTE)
DLCI = 503, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0
input pkts 5296 output pkts 6538 in bytes 539572
out bytes 580543 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
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 2156 out bcast bytes 215101
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 07:07:22, last time pvc status changed 07:06:59
cir 64000 bc 14000 be 0 byte limit 1750 interval 218
mincir 32000 byte increment 1744 Adaptive Shaping none
pkts 84 bytes 7301 pkts delayed 0 bytes delayed 0
shaping inactive
traffic shaping drops 0
Queueing strategy: fifo
Output queue 0/40, 0 drop, 0 dequeued
Rack2R5(config-map-class)#fram bc 15000
Rack2R5(config-map-class)#do sh fram pvc 503
PVC Statistics for interface Serial0/0 (Frame Relay DTE)
DLCI = 503, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0
input pkts 5300 output pkts 6540 in bytes 539876
out bytes 580711 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
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 2156 out bcast bytes 215101
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 07:07:30, last time pvc status changed 07:07:07
cir 64000 bc 15000 be 0 byte limit 1875 interval 234
mincir 32000 byte increment 1872 Adaptive Shaping none
pkts 86 bytes 7469 pkts delayed 0 bytes delayed 0
shaping inactive
traffic shaping drops 0
Queueing strategy: fifo
Output queue 0/40, 0 drop, 0 dequeued
Rack2R5(config-map-class)#
Rack2R5(config-map-class)#
Rack2R5(config-map-class)#fram bc 16000
Rack2R5(config-map-class)#do sh fram pvc 503
PVC Statistics for interface Serial0/0 (Frame Relay DTE)
DLCI = 503, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0
input pkts 5300 output pkts 6541 in bytes 539876
out bytes 580769 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
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 2157 out bcast bytes 215159
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 07:07:38, last time pvc status changed 07:07:15
cir 64000 bc 16000 be 0 byte limit 1000 interval 125
mincir 32000 byte increment 1000 Adaptive Shaping none
pkts 87 bytes 7527 pkts delayed 0 bytes delayed 0
shaping inactive
traffic shaping drops 0
Queueing strategy: fifo
Output queue 0/40, 0 drop, 0 dequeued
Rack2R5(config-map-class)#
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