Solved: CBWFQ - no match at class-map - Page 2

holgerseiler · ‎03-24-2010

Hello,

I have to test a congestion management for a customer.

Involved Hardware: 876 Series Router

IOS: advanced Security

I configured the following class-based-weighted-fair-queueing:

ip access-list extended QOS
        permit tcp any host 172.16.17.21 eq 10002
        permit tcp any host 172.16.17.24 eq 10002
        permit tcp any host 195.145.98.212 eq 443
        permit tcp any host 195.145.98.220 eq 443
        permit tcp 10.0.0.0 0.255.255.255 160.83.1.240 0.0.0.7 eq 53301
        permit icmp 10.0.0.0 0.255.255.255 160.83.1.240 0.0.0.7
        permit tcp any 172.19.201.160 0.0.0.15 eq 1494
        permit tcp any 172.19.201.160 0.0.0.15 eq 1604

    class-map match-all DATA
        match access-group name QOS
    class-map match-all VOICE
        match precedence 3 5

    policy-map PRIO_QUEUEING
        class VOICE
            bandwidth percent 20
        class DATA
            bandwidth percent 50
        class class-default
            fair-queue

    interface dialer1
        service-policy output PRIO_QUEUEING

-----------------------------------------------------------------------------------------------------------

I got the following Output:

sh policy-map interface output
Dialer1

Service-policy output: PRIO_QUEUEING

    Class-map: VOICE (match-all)
      187112 packets, 27113032 bytes
      5 minute offered rate 13000 bps, drop rate 0 bps
      Match: precedence 3 5
      Queueing
        Output Queue: Conversation 25
        Bandwidth 23 (%)
        Bandwidth 12 (kbps)Max Threshold 64 (packets)
        (pkts matched/bytes matched) 0/0
        (depth/total drops/no-buffer drops) 0/0/0

    Class-map: DATA (match-all)
      0 packets, 0 bytes
      5 minute offered rate 0 bps, drop rate 0 bps
      Match: access-group name QOS
      Queueing
        Output Queue: Conversation 26
        Bandwidth 50 (%)
        Bandwidth 28 (kbps)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)
      1395439 packets, 362149552 bytes
      5 minute offered rate 216000 bps, drop rate 0 bps
      Match: any
      Queueing
        Flow Based Fair Queueing
        Maximum Number of Hashed Queues 16
        (total queued/total drops/no-buffer drops) 0/0/0

My question is why there are no matches at the class-map DATA. I took a look to the traffic with Netflow Tracker by Fluke and saw that the applications generated traffic.

Could anybody help me?

Kind regards

Holger

Lei Tian · ‎04-20-2010

Hi Holger,

If you classify and mark the traffic at LAN interface, you dont need to use 'qos pre-classify'. The DSCP value will be preserved.

HTH,

Lei Tian

holgerseiler · ‎04-20-2010

Hi,

how I can classify the traffic at incoming interface just like at my "access-list DATA", with class-map I don't could classify sophisticated enough.

regards

Holger

Lei Tian · ‎04-20-2010

Hi Holger,

Here is an configuration example

class-map mark_data
match access-group name QOS
class-map mark_voice
match access-group name VOICE
policy-map MARKING
class mark_data
set ip dscp af21
class mark_voice
set ip dscp ef

int vlan x
service-policy in MARKING

class-map DATA
match ip dscp af21
class-map VOICE
match ip dscp ef

policy-map PRIO_QUEUEING
class VOICE
bandwidth percent 20
class DATA
bandwidth percent 50
class class-default
fair-queue

HTH,

Lei Tian