<Help with GSR QOS configuration - COS and IP Precedence>

Michael Ruiz mruiz at telwestservices.com
Thu Sep 24 17:30:44 UTC 2009

Hello Folks,


                I am a different problem here this time It is on my Cisco 12008.  I currently have two types of access cards installed into the chassis.  I have a CHOC12-DS1/IR-SC card and a 6-CT3-SMB card.  I am running QOS on the unit.  I get this error when I do apply this command "tx-cos DS1-TX."  What brought this about was when t he service policy was entered the Queing strategy did not change. It still said FIFO. In slot 1 I have a channelized 6-CT3-SMB card installed.  Our previous engineer discovered that because the 6-CT3 card is an Engine 1 card and not an Engine 3 card, there are limitation of what you can do with the QOS of the line card itself.  So you have to setup almost like frame-relay type setup.   The question I have, is there limitation on the number of queuing strategies you can run at one time?


ar1.DLLSTXHW#show int ser 1/0/1:0

Serial1/0/1:0 is up, line protocol is up 

  Hardware is Channelized-T3


  Internet address is 

  MTU 1500 bytes, BW 1536 Kbit, DLY 20000 usec, rely 255/255, load 35/255

  Encapsulation PPP, crc 16, loopback not set

  Keepalive set (10 sec)

  LCP Open

  Open: IPCP

  Last input 00:00:01, output 00:00:01, output hang never

  Last clearing of "show interface" counters 00:13:45

  Queueing strategy: fifo --à

  Output queue 0/40, 0 drops; input queue 0/75, 0 drops

  5 minute input rate 97000 bits/sec, 56 packets/sec

  5 minute output rate 214000 bits/sec, 80 packets/sec

     45738 packets input, 9931625 bytes, 0 no buffer

     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

     67213 packets output, 22609196 bytes, 0 underruns

     0 output errors, 0 collisions, 0 interface resets

     0 output buffer failures, 0 output buffers swapped out

     0 carrier transitions alarm present

  Timeslot(s) Used: 1-24, Transmitter delay is 0 flags

  non-inverted data

ar1.DLLSTXHW#show run int ser 1/0/1:0

Building configuration...


Current configuration : 271 bytes


interface Serial1/0/1:0

no ip redirects

 no ip unreachables

 no ip directed-broadcast

 no ip proxy-arp

 encapsulation ppp

 no cdp enable

 service-policy output VOICE




ar1.DLLSTXHW(config-if)#tx-cos DS1-TX

service-policy is already configured on interface, tx-cos is not allowed


On my Channelized OC12 facilities I use the service policy command to add my Policy MAP to the interface.


ar1.DLLSTXHW#show policy-map 

  Policy Map VOICE

    Class VOICE


    Class class-default

      random-detect precedence-based

ar1.DLLSTXHW#show class

ar1.DLLSTXHW#show class-map 

 Class Map match-any class-default (id 0)

   Match any 


 Class Map match-any VOICE (id 7)

   Match ip  precedence 5 


ar1.DLLSTXHW#show access

ar1.DLLSTXHW#show access-lists VOICE

Extended IP access list VOICE

    permit tcp any any eq 1720

    permit udp any any eq 5060

    permit udp any any range 4000 6000

    permit udp any any range 16384 32767

    permit udp any any range 60000 65531

    permit udp any any range 6001 6300

    permit udp any any range 58000 59999

    permit udp any any range 32768 33000

    permit udp any host

    permit udp host any

    permit udp any host

    permit udp host any

    permit udp any eq 5060 any eq 5060

    permit udp any host

    permit udp host any





Michael Ruiz mruiz at telwestservices.com <mailto::mruiz at telwestservices.com> 




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