From: Bit Gossip (bit.gossip@chello.nl)
Date: Fri Dec 22 2006 - 17:51:30 ART
I would like to implement congestion avoidance in this FR setup so that
frame-relay-switch drops packets with DE flag set in case of congestion;
R1 and R4 set DE flag for ping.
According to:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fwan_c/wcffrely.htm#wp1055798
this can be done at interface level, point 3a) below; or at PVC level,
point 3b) below.
Point 3a) works but point 3b) doesn't!
Any idea what is wrong in 3b)?
Thanks,
Luca.
[R1] ---dlci 124--- [FR-switch] --- dlci 421--- [R4]
1) R1 set DE for ping packets via a frame-relay de-list and apply the
de-list to PVC 124:
frame-relay de-list 1 protocol ip list 100
interface Serial4/0.124 point-to-point
ip address 10.1.124.1 255.255.255.0
frame-relay de-group 1 124
frame-relay interface-dlci 124
access-list 100 permit icmp 10.1.124.0 0.0.0.255 any
2) R4 same story as for R1
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
3a) [fr-switch] performs congestion avoidance on switched PVC at
interface level. In case of congestion I see 'pkt above DE' increasing
in 'show frame pvc 421'
frame-relay switching
interface Serial1/0
description ** r1 s4/0 **
...
no fair-queue
frame-relay traffic-shaping
frame-relay interface-dlci 124 switched
load-interval 30
frame-relay intf-type dce
frame-relay route 122 interface Serial1/1 221
frame-relay route 123 interface Serial1/2 321
frame-relay congestion-management
threshold de 3
!
interface Serial1/3
description ** r4 s0/0 **
...
no fair-queue
no arp frame-relay
frame-relay traffic-shaping
frame-relay interface-dlci 421 switched
load-interval 30
frame-relay intf-type dce
frame-relay route 422 interface Serial1/1 224
frame-relay route 423 interface Serial1/2 324
frame-relay congestion-management
threshold de 3
!
connect CONNECT-R1R4 Serial1/0 124 Serial1/3 421
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
3b) [fr-switch] performs congestion avoidance on switched PVC at PVC
level. In case of congestion 'pkt above DE' is alway 0 in 'show frame
pvc 421'
frame-relay switching
frame-relay switching
interface Serial1/0
description ** r1 s4/0 **
...
no fair-queue
frame-relay traffic-shaping
frame-relay interface-dlci 124 switched
load-interval 30
class R1R4
frame-relay intf-type dce
frame-relay route 122 interface Serial1/1 221
frame-relay route 123 interface Serial1/2 321
frame-relay congestion-management
!
interface Serial1/3
description ** r4 s0/0 **
...
no fair-queue
no arp frame-relay
frame-relay traffic-shaping
frame-relay interface-dlci 421 switched
load-interval 30
class R1R4
frame-relay intf-type dce
frame-relay route 422 interface Serial1/1 224
frame-relay route 423 interface Serial1/2 324
frame-relay congestion-management
!
connect CONNECT-R1R4 Serial1/0 124 Serial1/3 421
!
map-class frame-relay R1R4
frame-relay congestion threshold de 3
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