Re: [Asterisk-Users] 802.1p , precedence and TOS

Steve Blair Thu, 21 Apr 2005 13:17:04 -0700

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" <[EMAIL PROTECTED]> To: "Asterisk Users Mailing List - Non-Commercial Discussion" <[email protected]> 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" <[EMAIL PROTECTED]> To: "Asterisk Users Mailing List - Non-Commercial Discussion" <[email protected]> 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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Re: [Asterisk-Users] 802.1p , precedence and TOS

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