The MPLS WG Archive

[Neetu Gupta <neetug@daewoo.dti.daewoo.co.kr>]

Snigdho,
    When the LSPs are created using Integrated Signalling protocol, the entry
is made in the Forwarding Engine, that contains a label for the information:
Source Address, Source Port, Destination Address, DestPort, Protocol, Class of
Service. This Class of Service can be the value specified for the Class of
Service in the Service Level Agreement with the Customer.
So, when the data packet comes, all these above mentioned fields are matched
with the fields in the IP Header of the Packet including  Class of Service
that is matched to TOS byte.
So, can't we map Class of Service to any of the DSCP values, and specify the
corresponding DSCP value for COS in the agreement with the Customer?

Snigdho Bardalai wrote:

> If you expect to have a DiffServ compliant application the IP header TOS
> bits should contain the DiffServ DSCP values like expedited, assured
> services etc.
>
> But if you expect to support Integrated Services the TOS bits in the IP
> header may not have any significance.
>
> Snigdho
>