The MPLS-OPS Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] Re: a question about SE sytle reservation
BUT accordong to RFC2205, "A service-specific calculation of Path_Te, the SUM of all
Tspecs that were supplied in Path messages from different previous hops". NOT THE LUB.
It means in Router1 Ic will reserve min(path_te,Resv_Te),while path_Te=4M and Resv_Te=3M?
It's funny. what's wrong
______________ ____________
S1(REQ 2M)----Ia| | | |
| Router1 |Ic___________Id | Router2 |Ie_____|
S2(REQ 2M)----Ib| | | | |
|______________| |___________| |
|
|ROUTER3
|
______________ |
| | |
S3(REQ 3M)----If| Router1 |Ig________________________________|
| | |
|_____________|
> > |
> > Sends | Reserves Receives
> > |
> > | ________
> > SE( S1{?B} ) <- (a) | (c) |(S1,S2) | (c) <- SE( (S1,S2){2B} )
> >
>Let us call the above node "R" ,
> Let us call the node upstream through interface "a" R1 .
> R forward {2B} to R1 but do not make any reservation over interface "a" .
> R1 recieving a request for {2B} over interface "a" .
> R1 calculate the Path_TE ( the sum of all Tspecs that were supplied in path
>msg's from different previous hob . pls refer to rfc 2205 sec 2.2 page 21) ,
>Since their is only one path msg which is from S1 forwarded to "a" so
>PATh_Te is equal to Tspec of S1 path msg ie: equal to {1B} .
>RSVP process on R1 will issue a "make reservation " call to "Traffic control" process (pls >refer to rfc 2205 sec 3.11.2 page 69) .
>the parametrs of such call :
>Interface which is equal to "a".
>TC_flowspec which is equal to {2B}
>TC_TSPEC which is Path_Te ie: {1B}
>For the traffic control at node R1, will make a reservation over interface "a" which is the >min (TC_flowspec,TC_TSpec ) ie: the reservation over interface "a" will be just {1B} .
> Let us call the above node "R" ,
>Let us call the node upstream through interface "a" R1 .
> R forward {2B} to R1 but do not make any reservation over interface "a" .
> R1 recieving a request for {2B} over interface "a" .
> R1 calculate the Path_TE ( the sum of all Tspecs that were supplied in path
>msg's from different previous hob . pls refer to rfc 2205 sec 2.2 page 21) ,
>Since their is only one path msg which is from S1 forwarded to "a" so
>PATh_Te is equal to Tspec of S1 path msg ie: equal to {1B} .
>RSVP process on R1 will issue a "make reservation " call to "Traffic control" process (pls >refer to rfc 2205 sec 3.11.2 page 69) .
>the parametrs of such call :
>Interface which is equal to "a".
>TC_flowspec which is equal to {2B}
>TC_TSPEC which is Path_Te ie: {1B}
>For the traffic control at node R1, will make a reservation over interface "a" which is the >min (TC_flowspec,TC_TSpec ) ie: the reservation over interface "a" will be just {1B} .
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