[c-nsp] Frame-relay queuing / FRTS / CBWFQ - 12.2.28SB4

[Rolf Mendelsohn]

Hi Everybody,

I have a scenario where I would like to be able to provide QoS over an 
MPLS/Frame-relay backbone (i am running Frame-relay in order to Fragment 
packets).

The 7206 running 12.2.28SB4 doesn't allow fair-queuing on the frame-relay 
interface, the error is shown below. If I configure a frame-relay class cbwfq 
and a class-default with fair-queue beneath it, the configuration is 
successfully applied, but I have no way of knowing whether the configuration 
is in fact working & whether packets are being queued according to their 
respective IP Prec / DSCP values.

How are others doing this and what is the simplest way of doing DSCP/IP Prec 
based queuing on frame?

Router1							Router2
C2811(PE) (12.4.12SPServices) <---> C7206/NPE400 (12.2.28SB4)

Router2:

interface Serial3/5:0
 description 576k Backbone link to Town A POP
 mtu 1516
 bandwidth 576
 no ip address
 encapsulation frame-relay IETF
 frame-relay lmi-type ansi
 frame-relay intf-type dce
 frame-relay fragment 768 end-to-end
end

interface Serial3/5:0.1 point-to-point
 description 576k Backbone link to Town A POP
 bandwidth 576
 ip address A.B.C.D 255.255.255.254
 mpls ip
 no cdp enable
 frame-relay interface-dlci 208
end

router2(config-if)#fair-queue
Remove HQF queueing from interface before installing legacy command.
Possibly have service-policy with heirarchical shaping attached.

router2#sh queueing int s3/5:0
router2#

Router1:

interface Serial1/1:11
 description 576K Backbone link from Town A to Town B
 mtu 1516
 bandwidth 576
 no ip address
 encapsulation frame-relay IETF
 frame-relay fragment 768 end-to-end
 frame-relay lmi-type ansi
 max-reserved-bandwidth 90
end

router1#sh run int s1/1:11.1
Building configuration...

Current configuration : 229 bytes
!
interface Serial1/1:11.1 point-to-point
 description 576K Backbone link from Town A to Town B
 bandwidth 576
 ip address A.X.Y.Z 255.255.255.254
 mpls ip
 no cdp enable
 frame-relay interface-dlci 208
end

router1#sh queueing interface s1/1:11
Interface Serial1/1:11 queueing strategy: fair
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/0 (size/max total/threshold/drops)
     Conversations  0/24/256 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 576 kilobits/sec

  (depth/weight/total drops/no-buffer drops/interleaves) 1/4626/0/0/0
  Conversation 62, linktype: ip, length: 92
  source: A.B.C.D, destination: X.Y.Z.X, id: 0x9DDE, ttl: 255,
  TOS: 192 prot: 6, source port 22, destination port 63291

Router2:

interface Serial3/5:0
 description 576k Backbone link to Town A
 mtu 1516
 bandwidth 576
 no ip address
 encapsulation frame-relay IETF
 frame-relay lmi-type ansi
 frame-relay intf-type dce
 frame-relay fragment 768 end-to-end
 service-policy output cbwfq
end


router2#sh run | beg cbwfq
policy-map cbwfq
  class class-default
    fair-queue

router2#sh policy-map interface
 Serial3/5:0

  Service-policy output: cbwfq

    Class-map: class-default (match-any)
      6442 packets, 7133882 bytes
      5 minute offered rate 170000 bps, drop rate 60000 bps
      Match: any
        6442 packets, 7133882 bytes
        5 minute rate 170000 bps
      Queueing
      queue limit 64 packets
      (queue depth/total drops/no-buffer drops/flowdrops) 17/1558/0/1558
      (pkts output/bytes output) 151124/48986237
      Fair-queue: per-flow queue limit 16

Regards,
Rolf