[Diffserv-interest] RE: [Diffserv] [OFFLIST] MPLS+Diffserv(mapping DSCP to EXP)
"Jeff Norman" <jnorman@nortelnetworks.com> Wed, 05 February 2003 17:09 UTC
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Date: Wed, 05 Feb 2003 12:06:17 -0500
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From: Jeff Norman <jnorman@nortelnetworks.com>
Reply-To: Jeff Norman <jnorman@nortelnetworks.com>
To: Shahram Davari <Shahram_Davari@pmc-sierra.com>
cc: nerdboy@rediffmail.com, diffserv-interest@ietf.org
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Subject: [Diffserv-interest] RE: [Diffserv] [OFFLIST] MPLS+Diffserv(mapping DSCP to EXP)
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Shahram, You are correct.... i.e. you can use "signalled" E-LSPs --Jeff In message "[Diffserv] [OFFLIST] MPLS+Diffserv(mapping DSCP to EXP)", Shahram Davari writes: >Jeff, > >No, I am actually referring to E-LSPs. Each signaled E-LSP can support >up to 8 PHBs. To support 64 PHBs you need 8 parallel LSPs. > >In case of L-LSP, since each L-LSP can support a max of 3 PHBs, >you would need ~21 parallel LSPs to support the 64 PHBs. > >Yours, >-Shahram > >> -----Original Message----- >> From: Jeff Norman [mailto:jnorman@nortelnetworks.com] >> Sent: Tuesday, February 04, 2003 5:05 PM >> To: Shahram Davari >> Cc: 'Mark Duffy'; nerdboy@rediffmail.com; Diffserv@ietf.org; >> diffserv-interest@ietf.org >> Subject: RE: [Diffserv] [OFFLIST] MPLS+Diffserv(mapping DSCP to EXP) >> >> >> Shahram, >> You are referring to L-LSPs where a one-to-one mapping can >> be done, where as E-LSPs there isn't, which is what I believe >> nerdboy is asking about. >> >> Best Regards, >> --Jeff >> >> In message "[Diffserv] [OFFLIST] MPLS+Diffserv(mapping DSCP >> to EXP)", Shahram Davari writes: >> >> >> -----Original Message----- >> >> From: Mark Duffy [mailto:mduffy@quarrytech.com] >> >> Sent: Tuesday, February 04, 2003 7:29 AM >> >> To: nerdboy@rediffmail.com; Diffserv@ietf.org >> > >> >> >2. Further, since the DSCP ( pow(2,8) = 256 combinations ) >> >> is 8 bits and >> >> >provides 22 different PHB's(or roughly 7 different classes), >> >> > and the EXP is just 3 bits and therefore can provide >> >> only upto 8 >> >> >different classes, wouldnt there be loss of info while >> >> mapping DSCP->EXP ? >> >> > >> > >> >No because in MPLS we do DSCP=> PHB translation and PHB=> >> EXP+Label encoding. The label gives you the context info, so >> each label can support up to 8 PHBs. To support all 64 PHBs >> (which are not defined yet) you need 8 parallel LSPs. >> > >> > >> >-Shahram >> >_______________________________________________ >> >diffserv mailing list >> >diffserv@ietf.org >> >https://www1.ietf.org/mailman/listinfo/diffserv >> >Archive: >> http://www.ietf.org/mail-archive/working-groups/diffserv/curre >nt/maillist.html >> >> > > _______________________________________________ Diffserv-interest mailing list Diffserv-interest@ietf.org https://www1.ietf.org/mailman/listinfo/diffserv-interest
- [Diffserv-interest] [OFFLIST] MPLS+Diffserv(mappi… Aaron Striegel
- [Diffserv-interest] RE: [Diffserv] [OFFLIST] MPLS… Jeff Norman
- Re: [Diffserv-interest] RE: [Diffserv] [OFFLIST] … Brian E Carpenter
- [Diffserv-interest] RE: [Diffserv] [OFFLIST] MPLS… Shahram Davari
- [Diffserv-interest] RE: [Diffserv] [OFFLIST] MPLS… Jeff Norman