[Asterisk-Users] 802.1p , precedence and TOS

[Steve Blair]

Eugenio De Vena wrote:

>well tos is already set and working ( I debugged the packet in and out ) and
>they work
>but to and precedence work at layer 3 i.e. in the ip header so they are
>considered by routers
>and layer3 switches. I want the 802.1p switch to pass voice traffic
>priorized on the lan not the wan.
>The way to do this is at level 2 ( mac level ) . The only language switch
>understand, because they do not
>go at IP level ( at least 3com 3300 ... )
>  
>
Ah sorry. You did say 3Com 3300. Yes you are screwed. If you'd consider 
a different
switch perhaps you could gain some additional control over packet 
forwarding. On the
Extreme Summit switches you can mark, remark at the ingress port the 
802.1p COS
 by examining the IP precedence /DSCP. This allows an IP phone (for 
example) to
set IP precedence and the ingress switch to add the 802.1p COS tag on 
the way
into the network. Just a thought.



>Eugenio
>
>----- Original Message ----- 
>From: "Steve Blair" <blairs at isc.upenn.edu>
>To: "Asterisk Users Mailing List - Non-Commercial Discussion"
><asterisk-users at lists.digium.com>
>Sent: Thursday, April 21, 2005 6:56 PM
>Subject: Re: [Asterisk-Users] 802.1p , precedence and TOS
>
>
>  
>
>>  Why wouldn't you just use tos=<some value like 0xb8> or tos=lowdelay
>>depending upon the config file in question? Remember there is an overlap
>>between IP precedence bits and some DSCPs for backward compatability.
>>Honor that overlap and you can use DiffServ processing logic even if your
>>device can only set an IP prec. value.
>>
>>Eugenio De Vena wrote:
>>
>>    
>>
>>>well I thought that with diffserv it could be done, I will double check
>>>      
>>>
>and
>  
>
>>>let you know,
>>>thanks for you hint.
>>>Eugenio
>>>
>>>----- Original Message ----- 
>>>From: "SCollins" <smjjscollins at comcast.net>
>>>To: "Asterisk Users Mailing List - Non-Commercial Discussion"
>>><asterisk-users at lists.digium.com>
>>>Sent: Thursday, April 21, 2005 1:49 PM
>>>Subject: Re: [Asterisk-Users] 802.1p , precedence and TOS
>>>
>>>
>>>
>>>
>>>      
>>>
>>>>I Don't know if this is a solution that is not better suited for your
>>>>Linux Distro, using vconfig and a 802.1q/1p aware NIC, on the * Server,
>>>>        
>>>>
>to
>  
>
>>>>create and prioitize the Ingress and Egress Voice VLAN traffic.
>>>>
>>>>Would you not agree?
>>>>
>>>>Sean
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>        
>>>>
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>>>      
>>>
>>-- 
>>
>>ISC Network Engineering
>>The University of Pennsylvania
>>3401 Walnut Street, Suite 221A
>>Philadelphia, PA 19104
>>
>>
>>voice: 215-573-8396
>>
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>>
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>>
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>>
>>
>>
>>    
>>
>
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