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Frame-relay Traffic Shaping

tteslicko
Level 1
Level 1

We have switched to Frame-Relay with WorldCom or what ever name they go by now. Traffic shaping was employed without request here by one of my colleagues with the help of first or second level Cisco support. I feel either this is not set right, or we are getting jerked around by you know who. For instance: I cleared counters not more than 15 minutes ago and here is the remote end.

ew-Chester#sh frame-r pvc

PVC Statistics for interface Serial0/0 (Frame Relay DTE)

DLCI = 102, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0.102

input pkts 98719 output pkts 97033 in bytes 34745228

out bytes 10553573 dropped pkts 0 in FECN pkts 2507

in BECN pkts 0 out FECN pkts 0 out BECN pkts 0

in DE pkts 34772 out DE pkts 0

out bcast pkts 352 out bcast bytes 28553

pvc create time 14w5d, last time pvc status changed 1w5d

Here is the Hub Router:

DLCI = 108, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial3/1:0.108

input pkts 106648 output pkts 108865 in bytes 11634867

out bytes 37406970 dropped pkts 80 in FECN pkts 0

in BECN pkts 15849 out FECN pkts 0 out BECN pkts 0

in DE pkts 1525 out DE pkts 0

out bcast pkts 420 out bcast bytes 40320

pvc create time 46w4d, last time pvc status changed 1w5d

I can't say if this is normal (WE ARE WELL UNDER THE CIR AT THIS 15 MINUTE TIME FRAME) But methinks me smells a RAT!!!!

Here is the traffic shaping class it is using . We have a committed information rate of 256 on this line burstable (laughable) to 512k.

interface Serial3/1:0.108 point-to-point

description New Chester

bandwidth 512

ip address 10.250.120.1 255.255.255.0

frame-relay class 512k

frame-relay interface-dlci 108

map-class frame-relay 512k

frame-relay cir 512000

frame-relay bc 64000

frame-relay be 0

frame-relay mincir 256000

no frame-relay adaptive-shaping

2 Replies 2

Hello,

in order to guarantee the mincir, you need to have frame-relay adaptive-shaping enabled in your map class. Without adaptive shaping, interface congestion causes packets to be delayed or dropped at the interface. Since you have congestion (indicated by the BECN packets shown in your output), you should enable adaptive shaping:

map-class frame-relay 512k

frame-relay cir 512000

frame-relay bc 64000

frame-relay be 0

frame-relay mincir 256000

-->frame-relay adaptive-shaping

HTH,

GP

mohamed-khadr
Level 1
Level 1

What routing protocl r u running? If it's EIGRP or even OSPF, it will default to 64k on the interfac if u don't specify the BW & enable shaping.Once u enable shaping, u will brust all the way to 512K.

HTP

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