The MPLS WG Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] doubt on diff-serv
Murali,
Section 5.3 of <draft-ietf-mpls-diff-ext-09> indicates the expected behavior in the situation described in your mail:
"If a DIFFSERV object is not present in the Path message, the LSR
SHOULD interpret this as a request for an E-LSP using the
Preconfigured EXP<-->PHB Mapping. However, for backward
compatibility purposes with other non-Diff-Serv Quality of Service
options allowed by [RSVP_MPLS_TE] such as Integrated Services
Controlled Load or Guaranteed Services, the LSR MAY support a
configurable "override option". When this "override option" is
configured, the LSR interprets a path message without a Diff-Serv
object as a request for an LSP with such non-Diff-Serv Quality of
Service."
Francis.
Sasha Vainshtein <Sasha@AXERRA.com> on 25/06/2001 13:59:36
To: "'murali tallapudi'" <tallapudi@mail.com>
cc: "'mpls@uu.net'" <mpls@UU.NET>(bcc: Francis
ARTS/BE/ALCATEL)
Subject: RE: doubt on diff-serv
Murali,
This is a good and valid question. IMHO the answer is like following:
1. Router B operates in accordance with preconfigured EXP-->PHB mappings
2. Preconfigured mappings in any DiffServ-aware LSR MUST include
mapping of 000 (EXP) --> Default Forwarding PHB. May be this should
be explicitly added to the draft
3. Router A (which is not Diff-Serv-aware) MUST set EXP bits to 000.
This would result in consistent LSP behavior.
------------------------------------------
With best regards,
Sasha Vainshtein
email: sasha@axerra.com <mailto:sasha@axerra.com>
tel: +972-3-7659993 (office)
+972-8-9254948 (res.)
+972-58-674833 (cell.)
> -----Original Message-----
> From: murali tallapudi [mailto:tallapudi@mail.com]
> Sent: Monday, June 25, 2001 7:10 AM
> To: Sasha@AXERRA.com
> Subject: doubt on diff-serv
>
>
> hi,
>
> i got one doubt on diff-serv. can u see the attachment
> and clear my doubt?..
>
>
> regards
>
> murali
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