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QoS between Sites

Posted on 2008-10-02
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Last Modified: 2013-12-27
I'm having a problem with dropped phone calls over a WAN between two buildings.  The calls will connect and then drop after any given amount of time.  I would like to rule out the router configuration, could someone let me know if the QoS is configured correctly?

Router 1


class-map match-all Voice
 match access-group 20
!
!
policy-map Voice-Policy-Percent
description QoS policy for 75% avail bandwidth
 class Voice
  priority percent 75
 class class-default
  fair-queue
policy-map Voice-Policy-2
description QoS policy for full T1
 class Voice
  priority 1000
 class class-default
  fair-queue
!
!
!
interface Multilink1
 description T1 bundle to New Jersey
 ip address 172.16.1.1 255.255.255.252
 service-policy output Voice-Policy-Percent
 ppp multilink
 ppp multilink fragment disable
 ppp multilink group 1
!
interface GigabitEthernet0/0
 description NewJersey LAN
 ip address 192.168.160.5 255.255.240.0
 duplex auto
 speed auto
!
interface GigabitEthernet0/1
 description PBX VLAN
 ip address 192.168.150.5 255.255.255.0
 duplex auto
 speed auto
!
interface Serial0/0/0
 description WAN Link to MDL-WWMP
 ip address 172.16.1.9 255.255.255.252
 service-policy output Voice-Policy-Percent
 service-module t1 clock source internal
 service-module t1 timeslots 1-24
!
interface Serial0/1/0
 description to Texas Broadwing#
 no ip address
 encapsulation frame-relay IETF
 shutdown
 service-module t1 timeslots 1-24
 frame-relay lmi-type ansi
!
interface Serial0/2/0:0
 description T1 to Houston, circuit
 no ip address
 encapsulation ppp
 ppp multilink
 ppp multilink group 1
!
interface Serial0/2/1:0
 description T1 to Houston, circuit
 no ip address
 encapsulation ppp
 ppp multilink
 ppp multilink group 1
!
ip classless
ip route 0.0.0.0 0.0.0.0 192.168.160.1
ip route 10.0.0.0 255.255.255.0 192.168.160.8
ip route 172.16.1.4 255.255.255.252 172.16.1.2
ip route 192.168.180.0 255.255.255.0 172.16.1.2
ip route 192.168.181.0 255.255.255.0 172.16.1.10
ip route 192.168.190.0 255.255.255.0 192.168.160.8
ip route 192.168.201.0 255.255.255.0 192.168.160.21
ip route 192.168.202.0 255.255.255.0 192.168.160.21
ip route 192.168.203.0 255.255.255.0 192.168.160.21
ip http server
ip http authentication local
ip http timeout-policy idle 600 life 86400 requests 10000
!
!
access-list 20 remark ip address of voip device
access-list 20 permit 192.168.160.150
access-list 20 permit 192.168.150.150


Router 2



User Access Verification

Password:
MDL-WWMP#sh running-config
Building configuration...

Current configuration : 1507 bytes
!
version 12.4

!
hostname MDL-WWMP
!
boot-start-marker
boot-end-marker
!
logging buffered 51200 warnings
enable password
!
no aaa new-model
ip cef
!

class-map match-all Voice
 match access-group 20
!
!
policy-map Voice-Policy-Percent
  description QoS policy for 75% avail bandwidth
 class Voice
  priority percent 75
 class class-default
  fair-queue
!
!
!
interface FastEthernet0/0
 description $ETH-LAN$$ETH-SW-LAUNCH$$INTF-INFO-FE 0$
 ip address 192.168.181.5 255.255.255.0
 duplex auto
 speed auto
!
interface FastEthernet0/1
 no ip address
 duplex auto
 speed auto
!
interface Serial0/1/0
 description WAN link to
 ip address 172.16.1.10 255.255.255.252
 service-module t1 timeslots 1-24
 service-policy output Voice-Policy-Percent
!
ip route 0.0.0.0 0.0.0.0 172.16.1.9
!
ip http server
ip http authentication local
ip http timeout-policy idle 600 life 86400 requests 10000
!
access-list 20 remark ip address of voip device
access-list 20 permit 192.168.181.150
snmp-server community MDLAB RO
snmp-server enable traps tty

Thank you
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Question by:mdltech
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4 Comments
 
LVL 8

Accepted Solution

by:
MrJemson earned 750 total points
ID: 22630434
Looks ok for straight IP QoS.

When I setup QoS I usually do it via protocol not via the IP. There may be a bunch of other services running on the VoIP device, that are sending data that is being prioritized over the link that don't need to be.

Heres what I would have for my class-map:

class-map match-all Voice
  match protocol rtp audio
  match protocol sip
  match protocol rtcp

Maybe give that a go, and see if there is any improvement.
0
 

Author Comment

by:mdltech
ID: 22633361
Thank you, I'll give that a try
0
 
LVL 8

Assisted Solution

by:MrJemson
MrJemson earned 750 total points
ID: 22656648
How did you go with this?

Any update?
0
 

Author Closing Comment

by:mdltech
ID: 31502525
So far it is working.  I'll give it a few more days
0

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