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Hoi y'all,

I'm trying to set up QoS on my ADSL-router, but I don't seem to get
anywhere..

Could any of you give me a pointer as to how to set up QoS on an
ATM-interface?

I don't use a dialer-interface for the DSL-connection, and have a
subinterface with the pvc configured.
Hope you can help me...

Kind regards,

Sebastiaan Brozius

This is a subject I'm interested in also.

My DSL setup has PPPoE so it's more complicated with a dialer
interface. Which is worse for me.

However, using my Cisco 1720 router running 12.3(5a), here's what I've
learned so far.
- The ATM interface doesn't support CBWFQ
- Can put WRED but not FRED on the pvc.
- I'm unclear about the queueing relationship of the 4 interfaces for
the DSL connection; ATM0, ATM0.1, Dialer0, Virtual-Access1.
I'll be interested in what we learn.

Iskander wrote:
> Hoi y'all,
>
> I'm trying to set up QoS on my ADSL-router, but I don't seem to get
> anywhere..
>
> Could any of you give me a pointer as to how to set up QoS on an
> ATM-interface?
>
> I don't use a dialer-interface for the DSL-connection, and have a
> subinterface with the pvc configured.
> Hope you can help me...
>
> Kind regards,
>
> Sebastiaan Brozius
>

Exactly what are you trying to achieve? There's no such thing as a
general qos setup, we need to know your requirements.

What I'm trying to set up, is to be able to give EIGRP a Low
Latency-priority, a Custom-protocol (RDP) a fixed minimum bandwidth
with the ability to grab what it needs above the minimum, HTTP and FTP
a lesser priority, and the rest whatever bandwidth is available...

Iskander wrote:
> What I'm trying to set up, is to be able to give EIGRP a Low
> Latency-priority, a Custom-protocol (RDP) a fixed minimum bandwidth
> with the ability to grab what it needs above the minimum, HTTP and FTP
> a lesser priority, and the rest whatever bandwidth is available...
>
Ok, that's fairly easy.

1) First you need a class-map matching each of the 4 classes.

Eigrp should already be marked to ip precedence 6 by your router, but
you can check this with a packet sniffer. So you can just match ip prec
6 for your priority class, and you will pick anything the router marks
to 6 by default, such as routing protocols and ntp.

class-map match-any EIGRP-ET-ALL
match ip precedence 6

The other classes you should be able to figure out...

2) 2nd the actual policy, e.g.

policy-map ADSL
class eigrp-et-all
priority percent x
class rdp
bandwidth percent y
class http-ftp
bandwidth percent z
class class-default (optional)
bandwidth percent n

3) Apply the policy to the PVC (not sub-int

interface atm 0
pvc 8/35
service policy output ADSL

Works like a charm!

One more Q, though...

As far as I can tell, the bandwidth-values are fixed reservations for
the QoS-classes. Is there a way to specify a minimum and a maximum a
class can use, using ATM sub-interfaces?

Ben wrote:

[ deleted ]

> 3) Apply the policy to the PVC (not sub-int)
>
> interface atm 0
> pvc 8/35
> service policy output ADSL

I apply my service policy to the pvc and the service policy disappears!

PVC accepts the "service-policy output ADSL" command without complaint.
However when I do a "show run" it's not there, and "show policy int
atm0.1 vc 0/35" says a service policy is not configured on that pvc.

I'm going to try upgrading from my 12.3(5a) to a newer version.

Do a "term mon" before going into config-mode and then re-apply the
policy.
When you do an "exit-vc" and "exit" after applying the policy, the
reason for not applying the policy will be shown...

Iskander wrote:
> Do a "term mon" before going into config-mode and then re-apply the
> policy.
> When you do an "exit-vc" and "exit" after applying the policy, the
> reason for not applying the policy will be shown...


Here's the error:
Feb 18 16:17:58.585 CST: I/f ATM0.1 VC 0/35 class cmUDP requested
bandwidth 150 (kbps), available only 0 (kbps)

Neither the "show interface" or "show atm 0.1 pvc 0/35" show a 0
bandwidth.

Can you post the config of that (sub)-interface? (Omit usernames and
passwords if in that config....)