DSCP to MPLS EXp bit mapping how ???

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Dec 23rd, 2003
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If Ip precedence is used, then mapping the same to exp bit is one-2-one. If DSCP is used, then how is the mapping done to exp bit which hs only 8 possible values and where as dscp can hv 64 possible vaues..


any ur/doc explaning thi mapping would be apperciated.


thx

hanu

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Harold Ritter Tue, 12/23/2003 - 05:10
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No matter if you you DSCP or IP precedence, only the first 3 bits of the IP header TOS field are used since the exp bits field is 3 bit long.


The mapping from DSCP to MPLS exp bits is:


0-7 to 0

8-15 to 1

16-23 to 2

24-31 to 3

32-39 to 4

40-47 to 5

48-55 to 6

56-63 to 7


Hope this helps,

hjerbandi Tue, 12/23/2003 - 20:57
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hi


thx for the explanation, i see the same mapping done in Ip solution centre also. Got confused with one of the rfc explaining about mpls and Diff serv :)


thx

hanu

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