[cisco-voip] Trusting CoS on router uplink from switch...

Wed Jul 23 12:39:23 EDT 2008

OK, so for inbound trusting on a dot1q, on a switchport, we do:

mls qos trust cos

How do you do it outbound, and then inbound on the voice gateway?

It is a 2811 in the lab...

Jonathan

On Wed, Jul 23, 2008 at 11:38 AM,  <Thorsten.Mayr at barclayscapital.com> wrote:
> To cut it short yes. Trust the VG on the switch inbound to the
> switchport, and trust the switch inbound to the VG's port.
> What Gateway is it? 3800?
>
>
> Just my 2 cents, if someoen could confirm or correct where I am wrong...
>
> Cheers
> T
>
> PS: sorry can't post to the ccie group yet - haven't subscribed yet.
>
>> -----Original Message-----
>> From: Jonathan Charles [mailto:jonvoip at gmail.com]
>> Sent: Wednesday, July 23, 2008 5:33 PM
>> To: Mayr, Thorsten: IT (LDN)
>> Cc: cisco-voip at puck.nether.net; ccie_voice at onlinestudylist.com
>> Subject: Re: [cisco-voip] Trusting CoS on router uplink from switch...
>>
>> Cos is recommended (per the QoS SRND) for any dot1q trunk...
>>
>> However, my concern is not the switch, but the voice
>> gateway's Fast Ethernet to the switch... Do we need to trust
>> outbound (switch to gateway), and inbound (on the gateway side...)
>>
>>
>>
>> Jonathan
>>
>> On Wed, Jul 23, 2008 at 11:28 AM,
>> <Thorsten.Mayr at barclayscapital.com> wrote:
>> > Someone correct me if wrong and might actually depend on
>> IOS and type
>> > of kit as well.
>> >
>> > As long as you don't have mls configured at all, you won't be
>> > rewriting the DSCP fields.
>> > If you have mls configured, you'll have to trust COS or
>> DSCP whatever
>> > you prefer otherwise you'll overwrite with default value.
>> >
>> > I am not sure if it's better to trust on DSCP or COS in
>> this case, If
>> > you are trunking you might as well stick to COS. Also
>> you'll have wrr
>> > or srr queues setup which will map to COS.
>> >
>> > Haven't touched qos for a while and seems like I do have to
>> freshen up
>> > on this topic ;)
>> >
>> >> -----Original Message-----
>> >> From: Jonathan Charles [mailto:jonvoip at gmail.com]
>> >> Sent: Wednesday, July 23, 2008 5:18 PM
>> >> To: Mayr, Thorsten: IT (LDN)
>> >> Cc: cisco voip; OSL CCIE Voice Lab Exam
>> >> Subject: Re: [cisco-voip] Trusting CoS on router uplink
>> from switch...
>> >>
>> >> Well, I do have subinterfaces and it is a dot1q trunk to the
>> >> gateway... just looking for a config to trust the CoS and
>> DSCP... or
>> >> wondering if the router will clear the DSCP and CoS....
>> >>
>> >>
>> >>
>> >> Jonathan
>> >>
>> >> On Wed, Jul 23, 2008 at 9:38 AM,
>> >> <Thorsten.Mayr at barclayscapital.com> wrote:
>> >> > Charles,
>> >> > You won't have COS on the link to the gateway as you
>> won't have a
>> >> > dot1.q/isl tag, unless you use subinterfaces on the router.
>> >> >
>> >> > I'd trusting on DSCP in that case.
>> >> >
>> >> > Did I get this one right, now? ;)
>> >> >
>> >> > T
>> >> >
>> >> >> -----Original Message-----
>> >> >> From: cisco-voip-bounces at puck.nether.net
>> >> >> [mailto:cisco-voip-bounces at puck.nether.net] On Behalf
>> Of Jonathan
>> >> >> Charles
>> >> >> Sent: Wednesday, July 23, 2008 2:58 PM
>> >> >> To: cisco voip; OSL CCIE Voice Lab Exam
>> >> >> Subject: [cisco-voip] Trusting CoS on router uplink
>> from switch...
>> >> >>
>> >> >> OK, so we set the switch ports to trust CoS on the dot1q
>> >> trunk from
>> >> >> phone to switch... are these then trusted from that point
>> >> on, or do
>> >> >> we need to trust them elsewhere as well?
>> >> >>
>> >> >> Do we need to add any config to the voice gateways to
>> >> trust the CoS
>> >> >> coming from the switches?
>> >> >>
>> >> >>
>> >> >>
>> >> >>
>> >> >> Jonathan
>> >> >> _______________________________________________
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>> >> >> cisco-voip at puck.nether.net
>> >> >> https://puck.nether.net/mailman/listinfo/cisco-voip
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