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Setting up QOS on 831 for VoIP

 
 
craigdt-online@charter.net
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      04-09-2006
I have a Cisco 831 Router running code version 12.3. I am trying to
setup QOS for VoIP (using SunRocket). I have set a couple things up,
but while I'm talking if I do an upload test quality is terrible.
Downstream is fine even during a test.

I have Charter as my ISP, and I consistently get 2.9 Mb down/240 Kb up
using Speakeasy's test.

Here is my current config:

Current configuration : 2077 bytes
!
version 12.3
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname Thomas
!
logging buffered 4096 informational
enable secret 5 xxxx
enable password 7 xxxx
!
no aaa new-model
ip subnet-zero
ip dhcp excluded-address 192.168.2.4
ip dhcp excluded-address 192.168.2.5
ip dhcp excluded-address 192.168.2.106
!
!
ip audit notify log
ip audit po max-events 100
no ftp-server write-enable
!
!
!
!
!
!
class-map match-all voice
match ip precedence 5
!
!
policy-map LLQ
class voice
priority 300
class class-default
fair-queue
policy-map shape
class class-default
shape average 3250000
service-policy LLQ
!
!
!
interface Ethernet0
ip address 192.168.2.1 255.255.255.0
ip nat inside
service-policy output shape
!
interface Ethernet1
ip address dhcp
ip nat outside
duplex auto
!
ip nat inside source list 102 interface Ethernet1 overload
ip nat inside source static tcp 192.168.2.4 21 interface Ethernet1 21
ip nat inside source static tcp 192.168.2.4 80 interface Ethernet1 80
ip nat inside source static tcp 192.168.2.4 6000 interface Ethernet1
6000
ip nat inside source static udp 192.168.2.4 177 interface Ethernet1 177
ip nat inside source static tcp 192.168.2.4 20 interface Ethernet1 20
ip nat inside source static tcp 192.168.2.4 22 interface Ethernet1 22
ip nat inside source static tcp 192.168.2.5 8180 interface Ethernet1
8180
ip nat inside source static tcp 192.168.2.106 3389 interface Ethernet1
3389
ip nat inside source static tcp 192.168.2.106 5800 interface Ethernet1
5800
ip nat inside source static tcp 192.168.2.106 5900 interface Ethernet1
5900
ip nat inside source static tcp 192.168.2.5 80 interface Ethernet1 81
ip classless
no ip http server
no ip http secure-server
!
access-list 102 permit ip 192.168.2.0 0.0.0.255 any
dialer-list 1 protocol ip permit
!
line con 0
no modem enable
line aux 0
line vty 0 4
exec-timeout 120 0
password 7 xxxx
login
length 0
!
scheduler max-task-time 5000
!
end

 
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Scooby
Guest
Posts: n/a
 
      04-10-2006
<craigdt-> wrote in message
news: oups.com...
>I have a Cisco 831 Router running code version 12.3. I am trying to
> setup QOS for VoIP (using SunRocket). I have set a couple things up,
> but while I'm talking if I do an upload test quality is terrible.
> Downstream is fine even during a test.
>
> I have Charter as my ISP, and I consistently get 2.9 Mb down/240 Kb up
> using Speakeasy's test.
>
> Here is my current config:
>
> Current configuration : 2077 bytes
> !
> version 12.3
> no service pad
> service timestamps debug datetime msec
> service timestamps log datetime msec
> service password-encryption
> !
> hostname Thomas
> !
> logging buffered 4096 informational
> enable secret 5 xxxx
> enable password 7 xxxx
> !
> no aaa new-model
> ip subnet-zero
> ip dhcp excluded-address 192.168.2.4
> ip dhcp excluded-address 192.168.2.5
> ip dhcp excluded-address 192.168.2.106
> !
> !
> ip audit notify log
> ip audit po max-events 100
> no ftp-server write-enable
> !
> !
> !
> !
> !
> !
> class-map match-all voice
> match ip precedence 5
> !
> !
> policy-map LLQ
> class voice
> priority 300
> class class-default
> fair-queue
> policy-map shape
> class class-default
> shape average 3250000
> service-policy LLQ
> !
> !
> !
> interface Ethernet0
> ip address 192.168.2.1 255.255.255.0
> ip nat inside
> service-policy output shape
> !
> interface Ethernet1
> ip address dhcp
> ip nat outside
> duplex auto
> !


<snip>

It seems to me that you only have the QOS policy applied one way. Output on
your LAN port would indicate that you are shaping on Downloads. If you want
to shape on uploads, apply a QOS policy output on E1 as well. However, you
may wish to create a new policy due to the fact that your connection is not
symetrical.

Hope that helps,

Jim


 
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