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Router behind ISP Cisco IAD device

Hi, I don't even know how to word this question so here I go. I have an interesting situation where our ISP is providing Voice and Data services via. a Cisco IAD 2431 device. We have two full T1 circuits both going into the serial interfaces of the IAD device. There are two open f/E interfaces on the IAD for us to plug into to access the data portion of the network. We have no rights or access to the IAD for configuration or setup. And therefore are limited to what we can do. Our ultimate goal is to configure SIP and AutoQos on a router so we can manage and mark voice traffic (SIP/RTP) with priority but can not do this solely with a switch or can we?

Our current setup:

NIU ---> (T0/T1) IAD 2431 (f/E0) ---> ASA 5510 ---> Cat. 3570G-(PoE) ---> Network/IP Phones/Ect.

From my research we can not do QoS with this setup?

We want to do this:


NIU ---> (T0/T1) IAD 2431 (f/E0) ---> Cisco 2821 ---> ASA 5510 ---> Cat. 3570G-(PoE) ---> Network/IP Phones/Ect.

The 2821 has two GigE Interfaces on it (LAN) and 1 (WIC T1) on it. How can I set this up and defeat this nightmare and pathetic setup that XO has given us?


Please help!!!!
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mattjvillemure
Asked:
mattjvillemure
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2 Solutions
 
pjtemplinCommented:
Why are you saying it's a nightmare setup?

What are you trying to accomplish?

If you're having QoS problems over the T1s, you need to have XO enable an appropriate QoS method (LLQ with CBWFQ) on the multilink logical interface in the 2431, and do the same on their aggregation/distribution router on the other end.  You might be able to do the marking in the 3570; you might lose the markings through the ASA though (I simply don't know).
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mattjvillemureAuthor Commented:
Thanks for the response, well I did wrong and managed to get this and I won't say how. Can you or anyone possibly assist on where I can add a QoS policy which will give 100% priority to POTS and SIP service over data and therefor if SIP and POTS traffic comes in then data traffic drops to maintain VoIP communication and call quality? Here is my running-conf the IPs have been masked for privacy:

*Sensitive information removed by Netminder 22 June 2006*
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pjtemplinCommented:
You'd want it on the two serial interfaces, and it's there now.  However, you're semi-screwed because it's not multilink; choosing appropriate values will be difficult because the two T1s operate independently.  Not to mention, per-packet load sharing can mean out of order packet delivery, which can really screw with VoIP.

However, most sites download more than they upload.  Therefore, LLQ is more pertinent on the ISP's router than it is on this IAD.  You'll need to call them.
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mattjvillemureAuthor Commented:
Will this addition work?  Except replacing IAX protocols with SIP?

*Sensitive information removed by Netminder 22 June 2006*
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pjtemplinCommented:
OK, let's back up a bit here.  We're tossing around solutions of different types, but we haven't yet defined the problem.

What is the problem we're trying to fix?  Are you having performance problems over the T1 links?  If so, is it during uploads, downloads, or all the time?

The IAD is already configured to prioritize anything marked precedence 3 or 5 going out the T1s, except that everything coming into the Ethernet port is marked down to 0.

If you are doing your own VoIP in addition to the VoIP provided by XO, you should probably work WITH them to get the results that are best for everyone, rather than hacking up their box, etc.  First off, you should probably make sure they're prioritizing VoIP coming TO you, as that's more likely to experience congestion and queueing.  Then, have them remove the input policy on FE0, so that your existing VoIP traffic can qualify for QoS.  After that, re-evaluate how things are working and see what needs to be tweaked.
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lrmooreCommented:
Agree with pjtemplin.
Some points to throw out:

>We have no rights or access to the IAD for configuration or setup
>I did wrong and managed to get this and I won't say how

1. Assuming this is a managed XO provided router, you will screw your SLA if you go mucking with the configuration of that router. Don't do it.

2. You cannot use the ASA to mark VoIP traffic as precedence 5, but as PJ pointed out, the router strips off any precedence tags as it comes into the router anyway. XO will have to remove the input policy.

3. No matter what, if whatever Voice traffic you generate inside the ASA firewall, all precedence tags are stripped off anyway and even putting a 2821 router in between the ASA and the IAD won't help.

4. It would be much easier for us if we know exactly what problem you're trying to resolve.
> Our ultimate goal is to configure SIP and AutoQos on a router so we can manage and mark voice traffic (SIP/RTP) with priority
WHY? The ISP is already doing the QoS for you and it does not matter one bit what you do on the inside of the network because all QoS mechanisms that you try to put in place will cause you no end of grief, will make things much more difficult to troubleshoot, and have zero, none, nada, affect on any traffic once it hits this XO router anyway. If you're having problems with the service and you don't think you're getting the voice quality you think you should, see #1 above.

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mattjvillemureAuthor Commented:
Thank you all for your help. To clarify... Yes when we are using SIP any communication go out from our system such as voice to another caller has 0 latency and the caller has little to no issue hearing us. However, when they communicate with us there is a 5 second delay at times. Also we are having issues with echos and jitter. This is why I want to set up QoS. Does this help clarify?
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mattjvillemureAuthor Commented:
And I will communicate my needs to XO. I don't plan on tweaking their config. If I am at my wits end and am left no option but to switch to another provider because of their ignorance I will tweak it and then look at the same time as I have nothing to loose by doing so.
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pjtemplinCommented:
For the record, I work for a company similar to XO and competing with XO in some areas.  I for one would not be happy if you'd tried to connect to the CPE, but I'll also mention that it's a dog-eat-dog world in the telecom arena, and providers will do a lot to keep your business.  Have you ASKED them already about what you want to do?  From the looks of the configuration, they are doing everything possible to give your voice traffic* top priority (*the voice traffic you're getting from them), which is a good thing.  Be ready for them to say "we're not going to guarantee the quality of your XO-supplied phone lines if we adjust the QoS settings on the IAD", because it would be possible to put more VoIP packets on the wires than what the wires have room for.
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