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QoS help needed

cisconoobie
Level 2
Level 2

I am trying to allocate atleast 512Kbps to HREAP traffic but for some reason I get drops on my class-map cl_HREAP while class-default has no drops. I have a T1 and the link is barely used so I don't know why its dropping traffic? Does it think its a 64k link? Please verify my config.


access-list 150 permit udp any any eq 12223
access-list 150 permit udp any any eq 5247
access-list 150 permit udp any eq 12223 any
access-list 150 permit udp any eq 5247 any

!

class-map match-all cl_HREAP
match access-group 150
!
!
policy-map pm_HREAP
class cl_HREAP
  bandwidth 512
class class-default
  fair-queue
!

!
interface ATM1/0
bandwidth 45000
no ip address
ip pim sparse-mode
load-interval 30
atm scrambling cell-payload
atm uni-version 3.0
no atm ilmi-keepalive

!

interface ATM1/0.6 point-to-point
bandwidth 1544
ip address 10.1.1.1 255.255.255.252
ip pim sparse-mode
ip policy route-map INTERNET_OUT
pvc 6/36
  protocol ip 10.1.1.2 broadcast
  vbr-nrt 1500 1500 1
  encapsulation aal5snap
  service-policy output pm_HREAP
!

Here are my findings, please advise.


3845#show policy-map interface atm1/0.6
ATM1/0.6: VC 6/36 -

  Service-policy output: pm_HREAP

    Class-map: cl_HREAP (match-all)
      10480 packets, 1539855 bytes
      30 second offered rate 17000 bps, drop rate 0 bps
      Match: access-group 150
      Queueing
        Output Queue: Conversation 73
        Bandwidth 512 (kbps) Max Threshold 64 (packets)
        (pkts matched/bytes matched) 7455/1077130
        (depth/total drops/no-buffer drops) 0/745/0

    Class-map: class-default (match-any)
      13291 packets, 1474327 bytes
      30 second offered rate 9000 bps, drop rate 0 bps
      Match: any
      Queueing
        Flow Based Fair Queueing
        Maximum Number of Hashed Queues 64
        (total queued/total drops/no-buffer drops) 0/0/0

2 Replies 2

cisconoobie
Level 2
Level 2

If I do show queuing, I see that I'm using 630 Kilobits of available bandwidth, this may be the issue but where do I mention to use 1500 or atleast 1100 Kbps being 75% of that? Where is it getting this 630 Kbps calculation?

3845#show queueing interface atm1/0.6  
  Interface ATM1/0.6 VC 6/36
  Queueing strategy: weighted fair
  Output queue: 26/512/64/52507 (size/max total/threshold/drops)
     Conversations  1/41/64 (active/max active/max total)
     Reserved Conversations 1/1 (allocated/max allocated)
     Available Bandwidth 630 kilobits/sec

If you are getting drops, it is an indication that 512 guaranteed bandwidth is not enough. You need to allowed more for that class-map.

As your other question, it defaults to 75% available bandwidth but this can be modified with the max-reserved-bandwidth command.

Please refer to the documentation:

http://www.cisco.com/en/US/tech/tk39/tk48/technologies_tech_note09186a00800fe2c1.shtml

Regards,

Edison

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