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

Wed Jul 23 13:12:29 EDT 2008

The only thing you can specify on the VG inbound is a cos-dscp or
dscp-cos map which would save you the policy mark/remark in case needed
and granted the fact that you have COS on the frame... (you'll probably
not need to though)

as Ryan already pointed out, there is no trust command or anything
similar on the gateway )-:

T

> -----Original Message-----
> From: Ryan West [mailto:rwest at zyedge.com] 
> Sent: Wednesday, July 23, 2008 6:02 PM
> To: Jonathan Charles; Mayr, Thorsten: IT (LDN)
> Cc: cisco-voip at puck.nether.net
> Subject: RE: [cisco-voip] Trusting CoS on router uplink from switch...
> 
> mls qos trust cos on the inbound dot1q trunk for the switch 
> and nothing on the router.  There is no trust for outbound.  
> You can test by putting the policy-map on the router match on 
> just dscp 46 with a secondary match on protocol rtp audio and 
> should have little to nothing show up in the rtp audio matches.
> 
> -ryan
> 
> -----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 12:39 PM
> To: Thorsten.Mayr at barclayscapital.com
> Cc: cisco-voip at puck.nether.net
> Subject: Re: [cisco-voip] Trusting CoS on router uplink from switch...
> 
> 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
> >> >> >> _______________________________________________
> >> >> >> cisco-voip mailing list
> >> >> >> cisco-voip at puck.nether.net
> >> >> >> https://puck.nether.net/mailman/listinfo/cisco-voip
> >> >> >>
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