The MPLS-OPS Archive

[Terry Lee <terrylee@huawei.com>]

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} .