Question

Cisco 2620 Router VoIP QoS Configuration issue

Asked by: bmcc626

Hello,

I'm trying to set up LLQ for VoIP on our new T1 to XO. The T1 is NOT installed yet, so I don't know if that makes a difference or not with the error I'm getting. I just uploaded a new config to my router and it is balking, giving an error of:
......
I/f Serial0/0 class VOIP-SIP requested bandwidth 200 (kbps) Available only 0 (kbps)
I/f Serial0/0 class VOIP-RTP requested bandwidth 450 (kbps) Available only 0 (kbps)

deconfigure bandwidth before issuing this command in this class
......
 Here is the relevant config:

!
version 12.2
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname adtrouter02
!
enable password 7 114C180103000419102F39707A636D
!
ip subnet-zero
!
!
ip tftp source-interface FastEthernet0/0
ip domain-name adaptivedigital.com
!
!
class-map match-any VOIP-SIP
 match access-group 100
class-map match-any VOIP-RTP
 match access-group 101
!
policy-map qospolicy1
 class VOIP-SIP
  priority 200
 class VOIP-RTP
  priority 450
 class class-default
  fair-queue
!
interface FastEthernet0/0
 description WAN network
 ip address 207.101.100.65 255.255.255.192
 duplex auto
 speed auto
 service-policy output qospolicy1
!
interface Serial0/0
 description T1 to XO
 ip address 67.93.183.90 255.255.255.252
 encapsulation ppp
 service-module t1 timeslots 1-24
 service-policy output qospolicy1
!
ip classless
ip route 0.0.0.0 0.0.0.0 Serial0/0
ip http server
!
access-list 1 permit 207.101.100.66
access-list 1 deny   any
access-list 101 permit ip any any precedence critical
access-list 101 permit ip any any dscp ef
access-list 101 permit ip any any dscp 46
access-list 101 permit udp any any range 16384 32768
access-list 100 permit udp any any eq 5060
!

Any insight is appreciated. Thanks!
Brian

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Asked On
2008-01-15 at 09:14:03ID23084573
Tags

cisco

,

voip

,

qos

,

ios

,

sip

,

rtp

Topics

Voice Over IP

,

IP Telephony

,

Network Routers

Participating Experts
1
Points
250
Comments
4

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Answers

 

by: jdechiaroPosted on 2008-01-15 at 09:35:51ID: 20664588

The policy looks ok. A couple of things - FastEthernet 0/0 is the LAN interface or WAN? You should hard code the duplex to full 100, otherwise you can get clipping when the link negotiates. Also you only need the policy applied to the serial interface, remove it from the LAN.

What voice codec are you running? If g729 450kb should be ok, if g711 that may be a bit low as you need ~100kb per call. I usually reserve 1mb but it depends on your usage. If no voice calls are in progress the whole bandwidth is available for data.

The other thing to consider is XO will not shape on their end of the link ( i know from experience) so if you are using the full T1 you will experience QOS problems when the voice comes back in from their network.

 

by: bmcc626Posted on 2008-01-15 at 09:48:05ID: 20664670

Thanks for the information.

The FE 0/0 is our LAN interface outside the firewall. I will hard code the duplex/speed.

As for the codec, we will be running g.711, but since we have only 5 trunks available to us, I arrived at 450k based on 90k per call. The SIP bandwidth may be overkill.

Any recommendations on which ISPs will shape traffic? The circuit was supposed to be installed yesterday, but it isn't, so I don't need too many more reasons to cancel it and go with another provider... ;)

 

by: jdechiaroPosted on 2008-01-15 at 13:15:22ID: 20666694

XO has a great network but if you want QOS they would rather sell you a mpls solution which is pretty much the case with all the national ISP's right now. The only ISP I know of that will do class of service on T1's is Covad.

 

by: bmcc626Posted on 2008-01-16 at 07:35:56ID: 20672717

Thanks, I figured it out. I was copying over a running config and it created additional queues. I copied the config to the startup and rebooted and it worked properly. Thanks for the info...

20120131-EE-VQP-002

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