Came across some doc for DSCP on MPLs which states label can carry class values and mpls EXP bits carry drop value. If thats the case how can i see the class value in label and here are they mentioning 20 bits label? And is there any pre-defined values DSCP to EXP values?
In MPLS we are having only 3 bit which means not more than 8 combinations of offering class of service. If you want to map DSCP to MPLS QOS then you can imagine mappings will like 0-7 DSCP belongs to MPLS EXP bit 1 then 8 to 15 DSCO belongs to 2 and upto 64.
We have specific combination of the 3 bits in EXP, For there combination we have the DSCP range from 0 to 63.We are defining the Class of the label as follows:-
But in actual the Diffserv model uses 6 bits of IP tos value to define the Diffserv code points(DSCP) which distinguishes how packet can be treated by the network. The first 3 bits are of EXP bits and the other 3 bits are provided by the Service Provider named as IP prec Bits, so we have two modes now:-
Default A simple best-effort class, with a DSCP value of 000000. Packets with no defined DSCP are mapped to the default class for best-effort service.
Class Selector Provides for backward compatibility with 3-bit IP PREC classes. Basically, it defines a DCSP of XXX000, where XXX represent the PREC bits.
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