IP Type of Service

Christian Groves Christian.Groves at ERICSSON.COM
Wed May 9 01:40:55 EDT 2001


I think that any work on QoS parameters should be aligned with the work
occuring in ETSI Tiphon, ITU SG16, ITU SG11 etc. There's been a
considerable amount of effort in trying to come up with common
parameters for QoS. Any solution should tap into this.

Cheers, Christian

"Petros N. Mouchtaris" wrote:
>
> Brian,
>
> Actually there was a long discussion on this topic last year on the mailing
> list i.e. whether MGC should be able to signal an MG which TOS bit to use.
> The whole topic ended up being dropped. Check the archive for e-mails with
> title "MG and DiffServ".
>
> By the way, Flemming had volunteered to do some work but I assume it didn't
> have high enough priority.
>
> Excerpt from e-mail:
>
> "Tom-PT Taylor wrote:
>
>                     > You are correct that packages should be drawn up (and/or SDP defined) to
>                     > allow QOS parameter setting.  Volunteers?
>
>                     Sure - I can put a package proposal together.
>
>                     -- Flemming
>
> Petros
>
> "Rosen, Brian" <Brian.Rosen at marconi.com> on 05/08/2001 03:29:44 PM
>
> To:   "'Tom-PT Taylor'" <taylor at nortelnetworks.com>, "'Madhu Babu
>       Brahmanapally'" <madhubabu at kenetec.com>, "Rosen, Brian"
>       <Brian.Rosen at marconi.com>, "'Chuong Nguyen'"
>       <Chuong.Nguyen at usa.alcatel.com>, megaco <megaco at fore.com>
> cc:    (bcc: Petros N. Mouchtaris/Telcordia)
> Subject:  RE: IP Type of Service
>
> I'll look into this.  I agree.
>
> Brian
>
> -----Original Message-----
> From: Tom-PT Taylor [mailto:taylor at nortelnetworks.com]
> Sent: Tuesday, May 08, 2001 10:07 AM
> To: 'Madhu Babu Brahmanapally'; 'Rosen, Brian'; 'Chuong Nguyen'; megaco
> Subject: RE: IP Type of Service
>
> That makes sense.
>
> -----Original Message-----
> From: Madhu Babu Brahmanapally [mailto:madhubabu at kenetec.com]
> Sent: Tuesday, May 08, 2001 10:08 AM
> To: 'Rosen, Brian'; Taylor, Tom-PT [NORSE:B881:EXCH]; 'Chuong Nguyen';
> megaco
> Subject: RE: IP Type of Service
>
> Hi All,
> Another suggestion. Why cant the SDP be extended to incorporate a TOS
> parameter/attribute so that all the protocols(SIP,Megaco,MGCP) that use SDP
> need not define extra properties/parameter for supporting this.
>
> Regards
> Madhubabu
>
> -----Original Message-----
> From: owner-megaco at pit.comms.marconi.com
> [mailto:owner-megaco at pit.comms.marconi.com]On Behalf Of Rosen, Brian
> Sent: Tuesday, May 08, 2001 9:24 AM
> To: 'Madhu Babu Brahmanapally'; 'Tom-PT Taylor'; 'Chuong Nguyen';
> megaco at fore.com
> Subject: RE: IP Type of Service
>
> I don't agree.  The TOS for a particular stream should be set on that
> stream, not
> on the MG as a whole.  For example, if I have a multimedia MG, I will want
> to set
> the priority of voice higher than video, and video higher than normal.  If
> I
> implement a
> Multilevel Pre-emption and Priority scheme, some calls will have higher
> priority than
> others.  The TOS/frame priority has to be per stream.
>
> Brian
>
> -----Original Message-----
> From: Madhu Babu Brahmanapally [mailto:madhubabu at kenetec.com]
> Sent: Tuesday, May 08, 2001 9:24 AM
> To: 'Rosen, Brian'; 'Tom-PT Taylor'; 'Chuong Nguyen'; megaco at fore.com
> Subject: RE: IP Type of Service
>
> Hi All,
>
> The default TOS type should be defined on the ROOT termination for the
> default TOS used for all media packets generated from the MG. There should
> be a method (might be through some property) of specifying stream level TOS
> bits.
>
> I'm interested to work on RSVP.
>
> Regards
> Madhubabu
>
> -----Original Message-----
> From: owner-megaco at pit.comms.marconi.com
> [mailto:owner-megaco at pit.comms.marconi.com]On Behalf Of Rosen, Brian
> Sent: Tuesday, May 08, 2001 8:10 AM
> To: 'Tom-PT Taylor'; 'Chuong Nguyen'; 'megaco at fore.com'
> Subject: RE: IP Type of Service
>
> TOS should not be ignored at the edge router if the router is configured to
> enable DiffServ.
>
> It would be pretty simple to create one package that had the appropriate
> controls for
> DiffServ and 802.1p.  RSVP needs it's own package because there is
> messaging,
> and you at least an event or two
>
> The former could be an enumeration: QosMarking, that had values None, TOS
> and
> FramePriority, plus another integer, Value.  That would suffice I think,
> although you
> could conceivably get more clever with DiffServ.
>
> Shall I write something up along those lines?
>
> RSVP takes some more work.  Any volunteers?
>
> Brian
>
> -----Original Message-----
> From: Tom-PT Taylor [mailto:taylor at nortelnetworks.com]
> Sent: Monday, May 07, 2001 9:15 PM
> To: 'Chuong Nguyen'; 'megaco at fore.com'
> Subject: RE: IP Type of Service
>
> No such package has yet been defined.
>
> Various QOS architectures can be imagined.  Each would give rise to its own
> package, since the MGC-MG information flow would differ from one
> architecture to the next.  One question: unless the MG is itself the edge
> router, won't the ToS be ignored when the media packets reach the latter?
>
> -----Original Message-----
> From: Chuong Nguyen [mailto:Chuong.Nguyen at usa.alcatel.com]
> Sent: Monday, May 07, 2001 5:14 PM
> To: 'megaco at fore.com'
> Subject: IP Type of Service
>
> All
>
> In MGCP, MGC can specify IP Type of Service to the MG.
> Do we have an equivalent in Megaco?
>
> Is there or has anyone defined a package for IP Type of Service?
>
> Thanks
> Chuong
>
> --
>
>   Alcatel USA, Inc             Internet: Chuong.Nguyen at usa.alcatel.com
>
>   1000 Coit Road Plano, Texas 75075           Phone:    (972) 519-4613
>
>   **** The opinions expressed are not those of Alcatel USA, Inc ****
>
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