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FR BECN

i've the lab environment - FR switch and 3 routers connected to it.

R1-

!

interface Serial0/1/0

no ip address

encapsulation frame-relay

load-interval 30

frame-relay lmi-type ansi

!

interface Serial0/1/0.1 multipoint

ip address 10.10.1.1 255.255.0.0

frame-relay map ip 10.10.1.3 103 broadcast

frame-relay map ip 10.10.1.5 105 broadcast

----

R3

!

interface Serial0/0/1

ip address 10.10.1.3 255.255.0.0

encapsulation frame-relay

load-interval 30

frame-relay class cisco

frame-relay map ip 10.10.1.1 301 broadcast

frame-relay lmi-type ansi

!

!

map-class frame-relay cisco

frame-relay cir 256000

frame-relay mincir 128000

frame-relay adaptive-shaping becn

!

!

-----

R5

!

interface Serial0/1/1

ip address 10.10.1.5 255.255.0.0

encapsulation frame-relay

frame-relay class cisco

frame-relay map ip 10.10.1.1 501 broadcast

frame-relay lmi-type ansi

!

!

map-class frame-relay cisco

frame-relay cir 256000

frame-relay mincir 128000

frame-relay adaptive-shaping becn

!

!

==========================

I tryed to load R5 serial interface from R1 router using ping with big packets. But no one BECN was send.

R5#sh frame-relay pvc

PVC Statistics for interface Serial0/1/1 (Frame Relay DTE)

Active Inactive Deleted Static

Local 1 0 0 0

Switched 0 0 0 0

Unused 0 0 0 0

DLCI = 501, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/1/1

input pkts 2609 output pkts 304 in bytes 3626188

out bytes 198080 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 0 out bcast bytes 0

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

pvc create time 00:27:36, last time pvc status changed 00:27:36

R5#

Is't right and how to resolve it?

1 REPLY
Silver

Re: FR BECN

Hi,

BECN's are generated by FR switches configured to send them. If you haven't put any special config on the FR-SW in your network, you shouldn't expect BECNs to come back to you. Please see this link for enabling advanced FR-SW features:

http://www.cisco.com/en/US/products/sw/iosswrel/ps1834/products_feature_guide09186a0080080049.html#1047487

Will

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