Re: [Astlinux-users] VLAN's and 802.1p priority

[Lonnie A. <li...@lo...>]

On May 17, 2007, at 4:29 PM, Kristian Kielhofner wrote:

> On 5/17/07, Lonnie Abelbeck <li...@lo...> wrote:
>> Hopefully this is of general academic interest...
>>
>> I currently have many SPA-942 IP Phones and AstLinux (net4801) all
>> connected via VLAN capable switches, networked on VLAN20.  My VLAN's
>> are routed via m0n0wall (net4801) through a "tagged only" ethernet  
>> port.
>>
>> But, the ethernet ports of the phones and net4801 are untagged, the
>> switches are configured to add/strip the VLAN tags at the last few
>> meters.
>>
>> This all works well... but I have an Obsessive Network Tweaking
>> Disorder ;) .  All my switches prioritize egress traffic based on the
>> 802.1p bits added along with the VLAN ID tag.
>>
>> So, would I be smart in making all my internal voice traffic, VLAN
>> tagged from phone to Astlinux (end to end)?   Easily done in the
>> SPA-942's.
>>
>> In AstLinux I assume:
>> VLANS="eth0.20"
>> EXTIF="eth0.20"
>>
>> Would work in PBX only mode?
>>
>> Question:  What does AstLinux set the 802.1p priority tags to?  Does
>> asterisk sense the VLAN and set the 802.1p priority to 5 or 6 like
>> the SPA-942 does?
>>
>>  From a practical point of view, I doubt it makes much difference in
>> my situation, but learning is half the fun.
>>
>> Any experience is appreciated.
>>
>> Lonnie
>>
>
> Lonnie,
>
>   AstLinux doesn't currently set 802.1p priorities on VLANs.  There
> isn't even a config variable for it.  In linux, however, all you have
> to do is set the correct value with vconfig:
>
> vconfig set_egress_map eth0.41 1 5
>
>   How about something like this:
>
> EPRIO="eth2.41:5"
>
> etc, etc, etc?
>
>   Asterisk does not set layer 2 (802.1p) priority, but it does set
> layer 3 (DSCP/IP TOS) with tos= in sip.conf, iax.conf, etc.  How are
> your switches / routers configured for that?


Kristian,
> vconfig set_egress_map eth0.41 1 5
>   How about something like this:
>
> EPRIO="eth2.41:5"

Or how about allow the VLAN definition have an optional trailing :N  
where (0 <= N <= 7)

VLANS="eth0.20:5"

I assume "0" is the current AstLinux defined priority?

In my case, I have Layer 2 switches, and only 802.1p priority tags  
are used.  (HP Procurve 1700 and 1800 series)

Is this the the current best way of handling priorities?

Lonnie