The MPLS WG Archive

[Alok Singh <alok@chiplogic.com>]

Hi abhijeet,
           
regarding your question :
How an LSR can know beforehand that it is ingress for a particular FEC? A
particular LSR can be egress for a particular FEC, but whether it is
ingress or not is dependent upon the source from where packet is entering
MPLS domain.                                    
..................
I think we have to do an explicit configuration. It seems that is the only
way.. As far as your doubt that " an LSR acting as router depends upon the
source from where packet is entering the MPLS domain" i can say something.
An ingress router will have some interfaces related to MPLS domain. And
some other interfaces which will talk to the outside world. Whereas a
general LSR will have all interfaces talking to other nodes in the MPLS
domain only. This is one criterion from which we can differentiate b/w the
two. So i think somebody has to decide which interfaces belongs to a
particular MPLS domain and which to the outside world..
 
WOULD ANYBODY OUT THERE LIKE TO PUT MORE LIGHT ON THIS ISSUE ?

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 Alok Singh                    Phone No: Office - 3750251/52(extn. no 20)
 Member Technical Staff                  Residence - (040) 6580331 
 Embedded Systems Grp.         Email id: alok@chiplogic.com            
 Chiplogic India Pvt. Ltd.                aloksin_123@yahoo.com  
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