[j-nsp] forwarding class nd loss priority

[Andrew Jimmy]

Hi Patrik,
Many thanks for the reply. It really helps a lot. Can you please put some
comments on the following configuration. Just to avoid jitter, I'm keeping
the voice queue small.
 voice-profile
 fill-level 0 drop-probability 0;
 fill-level 25 drop-probability 100;

transmit-rate percent 20 exact;
buffer-size percent 20;
priority high;
drop-profile-map loss-priority any protocol any drop-profile voice-profile;

Is this good on Gig interface for Voice. What is exactly this file-level
with drop-probability.

-----Original Message-----
From: Patrik Olsson [mailto:df at webkom.se] 
Sent: Friday, May 01, 2009 10:26 AM
To: Andrew Jimmy
Cc: juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] forwarding class nd loss priority

Hello,


schedulers and schedulers-map is to schdule traffic egress.
The scheduler decides how much bandwidth a forwarding class gets.

Ingress forwarding class is decided and also a drop priority ion case
the traffic needs to be dropped.

In the scheduler within a forwarding class different drop-priorities can
be treated different through applying different drop profiles.

When it comes to voice, it should have it's own forwarding class of a
high priority. It should not be using different drop priorities and
different drop profiles. It should have one that says: drop everything
if you need to queue. Because voice traffic dont like to be queued and
sent later. It will mess the sound up. In return voice traffic should
have the highest priority and whatever bandwidth it need to push any
other traffic away.


Cheers
Patrik

> Forwarding class and loss priority is some of the confusing stuff in JUNOS
> world. Can someone write about loss priority/scheduler maps in detail
along
> with a example. Like what if you are running MPLS VPN and you want to keep
> priorities voice traffic (if you want to avoid jitter for the sip call)
> weather the congestion is happening or not. How do you do it practically.
> 
>  
> 
> voice-profile 
> 
> fill-level 0 drop-probability 0;
> 
> fill-level 25 drop-probability 100;
> 
>  
> 
> Is this good to have on Gig interface for Voice traffic.
> 
>  
> 
> transmit-rate percent 20 exact;
> 
> buffer-size percent 20;
> 
> priority high;
> 
> drop-profile-map loss-priority any protocol any drop-profile
voice-profile;
> 
>  
> 
> I will highly appreciate if someone can dig into this along with
> configuration/comments.
> 
>  
> 
> _______________________________________________
> juniper-nsp mailing list juniper-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/juniper-nsp


-- 

//Patrik

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