The MPLS WG Archive

[Yoshihiro Ohba <yoshihiro.ohba@toshiba.co.jp>]

Santosh,

 > Who is supposed to be the "Downstream" peer is decided by the global (or,
 > supra-local) entity which has the knowledge of all the LSPs and the topology
 > of the network.

Okay.  In such an assumption, an opaque FEC can be used, however..., 

 > An Opaque FEC has to be used for CR-LSP(sec 4.10 in
 > draft-ietf-mpls-cr-ldp-03) since this feature is there only in CR-LDP and to
 > setup a CR-LSP it is compulsory.

section 4.10 of the CR-LDP draft does not preclude the use of other
FECs elements (Type=0x01, 0x02, 0x03) in CR-LDP messages.

 > One more issue that crops up at this point is that how is this type of LSP
 > to be setup. The initial scenario that we discussed was


 >                 LER1 ------> LSR2-------->LSR3------>LSR4

LER2--------> LSR5

 > Now suppose the scenario were like

 >                 LER1 ------> LSR2-------->LSR3------>LSR4------>LSR6

LER2--------> LSR5------->LSR7

 > and LSR7 was supposed to connect to LSR4. How is the new LSP to be setup?
 > The  global (or, supra-local) entity will inform only LER2 which will be
 > sending message to LSR5 which would in turn send the request to LSR7. Is
 > there any standard draft on how this is to be handled?

I don't think there is any standard draft proposing to distribute
LSPID information to/from the global entity.  But is there a 
situation where the supposed scenario is useful?

Yoshihiro Ohba


 > Santosh Gupta