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Configuring QoS on Low bandwidth Dialer connections

I am currently trying to configure QoS on a 128K (I know ridicuoulsy small) satallite connection. The line has to carry critical data and when not heavily used a single Desktop Video Conference (DVC) stream.

All traffic needs to be encrypted and I am therefore using VTI Tunnels, using dialler interfaces over HWIC-4T RS530 serial in to the satalleite communications equipment,

Hardware used at both ends are 3845 ISR routers, running  Advanced Enterprise 12.4(15)T IOS.

The issue I have is that I can provision traffic on the link using PPP Multilink with Interleaving, but as soon as I add a Service Policy to the line the Queues fill up and I get no data through. The Service Policy without Multilink configured appears to perfom and queue traffic as expected.

Is it possible to configured CBWFQ with a fair-queue default clas on a PPP Multilink dialer connection?

I have provided an example configuration for one end of the link (both ends are the same) and some additioanal output for ther interfaces and policy.

Any advice and assistance is very much appreciated.

Cheers

Steve

interface Dialer1

description Dialer 1 - 128K - VSAT DDR connection

bandwidth 128

ip address 10.4.0.2 255.255.255.252

ip access-group VSAT_EVENT_CONTROL in

ip access-group VSAT_EVENT_CONTROL out

no ip redirects

no ip unreachables

no ip proxy-arp

encapsulation ppp

dialer pool 1

dialer string 575001

dialer string 575002

dialer string 575003

dialer-group 1

peer default ip address 10.4.0.1

no cdp enable

ppp multilink

max-reserved-bandwidth 86

service-policy output STEVE-TEST

interface Serial0/0/0

description S0/0/0 - VSAT connection - Tunnel 50200104

bandwidth 128

no ip address

no ip redirects

no ip unreachables

no ip proxy-arp

encapsulation ppp

dialer in-band

dialer pool-member 1

dialer-group 1

pulse-time 1

no cdp enable

max-reserved-bandwidth 86

D-3845-01-C1-1#sh policy-map int d1

Dialer1

  Service-policy output: STEVE-TEST

    Class-map: STEVE-TEST1 (match-any)

      78 packets, 13090 bytes

      5 minute offered rate 0 bps, drop rate 0 bps

      Match: ip dscp cs5 (40) ef (46) cs6 (48)

        78 packets, 13090 bytes

        5 minute rate 0 bps

      Queueing

        Output Queue: Conversation 41

        Bandwidth remaining 20 (%)Max Threshold 64 (packets)

        (pkts matched/bytes matched) 0/0

        (depth/total drops/no-buffer drops) 0/0/0

    Class-map: STEVE-TEST2 (match-all)

      0 packets, 0 bytes

      5 minute offered rate 0 bps, drop rate 0 bps

      Match: ip dscp af41 (34)

      Queueing

        Output Queue: Conversation 42

        Bandwidth remaining 4 (%)Max Threshold 64 (packets)

        (pkts matched/bytes matched) 0/0

        (depth/total drops/no-buffer drops) 0/0/0

    Class-map: class-default (match-any)

      92 packets, 21096 bytes

      5 minute offered rate 0 bps, drop rate 0 bps

      Match: any

      Queueing

        Flow Based Fair Queueing

        Maximum Number of Hashed Queues 32

        (total queued/total drops/no-buffer drops) 0/0/0

!

policy-map STEVE-TEST

class STEVE-TEST1

  bandwidth remaining percent 20

class STEVE-TEST2

  bandwidth remaining percent 4

class class-default

  fair-queue

!

class-map match-any STEVE-TEST1

match ip dscp cs5  ef  cs6

class-map match-all STEVE-TEST2

match ip dscp af41

Dialer1 is up, line protocol is up (spoofing)

  Hardware is Unknown

  Description: Dialer 1 - 128K VSAT DDR connection

  Internet address is 10.4.0.1/32

  MTU 1500 bytes, BW 128 Kbit/sec, DLY 20000 usec,

     reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation PPP, loopback not set

  Keepalive set (10 sec)

  DTR is pulsed for 1 seconds on reset

  Interface is bound to Vi1

  Interface is bound to Se0/0/0

  Last input never, output never, output hang never

  Last clearing of "show interface" counters 00:06:19

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: Class-based queueing

  Output queue: 0/1000/64/0 (size/max total/threshold/drops)

     Conversations  0/0/32 (active/max active/max total)

     Reserved Conversations 2/2 (allocated/max allocated)

     Available Bandwidth 110 kilobits/sec

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

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

     430 packets input, 99752 bytes

     264 packets output, 70512 bytes

Bound to:

Virtual-Access1 is up, line protocol is up

  Hardware is Virtual Access interface

  MTU 1500 bytes, BW 128 Kbit/sec, DLY 20000 usec,

     reliability 255/255, txload 1/255, rxload 7/255

  Encapsulation PPP, LCP Open, multilink Open

  Open: IPCP

  MLP Bundle vaccess, cloned from Dialer1

  Vaccess status 0x40, loopback not set

  Keepalive set (10 sec)

  DTR is pulsed for 5 seconds on reset

  Time to interface disconnect: idle 00:01:58

  Interface is bound to Di1 (Encapsulation PPP)

  Last input 00:05:43, output never, output hang never

  Last clearing of "show interface" counters 00:06:20

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 107

  Queueing strategy: Class-based queueing

  Output queue: 118/1000/64/107 (size/max total/threshold/drops)

     Conversations  2/3/32 (active/max active/max total)

     Reserved Conversations 2/2 (allocated/max allocated)

     Available Bandwidth 110 kilobits/sec

  5 minute input rate 4000 bits/sec, 2 packets/sec

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

     433 packets input, 99794 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

     267 packets output, 70554 bytes, 0 underruns

     0 output errors, 0 collisions, 0 interface resets

     0 unknown protocol drops

     0 output buffer failures, 0 output buffers swapped out

     0 carrier transitions

Bound to:

Serial0/0/0 is up, line protocol is up

  Hardware is HWIC-Serial

  Description: S0/0/0 - VSAT - DIALER 1

  MTU 1500 bytes, BW 128 Kbit/sec, DLY 20000 usec,

     reliability 255/255, txload 1/255, rxload 5/255

  Encapsulation PPP, LCP Open, multilink Open

  Link is a member of Multilink bundle Virtual-Access1, loopback not set

  Keepalive set (10 sec)

  DTR is pulsed for 1 seconds on reset

  Interface is bound to Di1 (Encapsulation PPP)

  CRC checking enabled

  Last input 00:00:01, output 00:00:03, output hang never

  Last clearing of "show interface" counters 00:06:23

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

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1 REPLY
New Member

Re: Configuring QoS on Low bandwidth Dialer connections

You can, but you need to apply it to the physical interface.

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