QoS issue

Unanswered Question
Apr 1st, 2008

hi:

we have a QoS issue, we confiured a router 2801, with QoS like this in a CPE:

class-map match-any voip

match dscp ef

match ip rtp 16384 16383

match access-group name voip

match access-group name Signaling

class-map match-any empresarial

match access-group name acl_qos_empresarial

class-map match-any datos

match access-group name acl_qos_internet

match access-group name acl_qos_datos

!

!

policy-map qos_motomex

class voip

set dscp ef

priority percent 25

police 64000 conform-action transmit exceed-action drop

class empresarial

set dscp af41

bandwidth percent 50

random-detect dscp-based

police rate percent 50

conform-action transmit

exceed-action set-dscp-transmit af31

class datos

set dscp af31

bandwidth percent 25

random-detect dscp-based

police rate percent 25

conform-action transmit

exceed-action set-dscp-transmit default

violate-action drop

class class-default

fair-queue

random-detect dscp-based

set dscp default

interface s0/1/0

bandwidth 256

service-policy output qos_motomex

Which the POP3 protocol is in the acl_qos_empresarial Access-list, but for some reason when someone send a large e-mail the bandwidth is congested and versy slow, i put the show policy-map int s0/1/0 and it seems like the class empresarial doesnt work.

Class-map: empresarial (match-any)

976451 packets, 240497189 bytes

30 second offered rate 254000 bps, drop rate 0 bps

Match: access-group name acl_qos_empresarial

976451 packets, 240497189 bytes

30 second rate 254000 bps

QoS Set

dscp af41

Packets marked 976736

Queueing

Output Queue: Conversation 73

Bandwidth 50 (%)

Bandwidth 128 (kbps)

(pkts matched/bytes matched) 24310/19100522

(depth/total drops/no-buffer drops) 2/250/0

exponential weight: 9

mean queue depth: 21

dscp Transmitted Random drop Tail drop Minimum Maximum Mark

pkts/bytes pkts/bytes pkts/bytes thresh thresh prob

af11 0/0 0/0 0/0 32 40 1/10

af12 0/0 0/0 0/0 28 40 1/10

af13 0/0 0/0 0/0 24 40 1/10

af21 0/0 0/0 0/0 32 40 1/10

af22 0/0 0/0 0/0 28 40 1/10

af23 0/0 0/0 0/0 24 40 1/10

af31 8186/11862661 0/0 0/0 32 40 1/10

af32 0/0 0/0 0/0 28 40 1/10

af33 0/0 0/0 0/0 24 40 1/10

af41 86136/14395434 0/0 0/0 32 40 1/10

af42 0/0 0/0 0/0 28 40 1/10

af43 0/0 0/0 0/0 24 40 1/10

cs1 0/0 0/0 0/0 22 40 1/10

cs2 0/0 0/0 0/0 24 40 1/10

cs3 0/0 0/0 0/0 26 40 1/10

cs4 0/0 0/0 0/0 28 40 1/10

cs5 0/0 0/0 0/0 30 40 1/10

cs6 0/0 0/0 0/0 32 40 1/10

cs7 0/0 0/0 0/0 34 40 1/10

ef 0/0 0/0 0/0 36 40 1/10

rsvp 0/0 0/0 0/0 36 40 1/10

default 0/0 0/0 0/0 20 40 1/10

I hope anybody can help me

I have this problem too.
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htarra Mon, 04/07/2008 - 11:10

As a good starting point for general QoS design and options have a look at the "Enterprise QoS Solution Reference Network Design Guide Version 3.3"

http://www.cisco.com/application/pdf/en/us/guest/netsol/ns432/c649/ccmigration_09186a008049b062.pdf

In your case you can implement additional classes and asign resources to them. Just keep in mind, that per default only 75% of the interface bandwidth can be used in a policy-map for guaranteed bandwidth.

An example of a modified policy to highlight, what I mean:

class-map match-any AutoQoS-VoIP-RTP-Trust

match ip dscp ef

class-map match-any AutoQoS-VoIP-Control-Trust

match ip dscp cs3

match ip dscp af31

class-map match-all FTP

match protocol ftp

policy-map AutoQoS-Policy-Trust

class AutoQoS-VoIP-RTP-Trust

priority percent 60

class AutoQoS-VoIP-Control-Trust

bandwidth percent 5

class FTP

bandwidth percent 10

class class-default

fair-queue

random-detect

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