Establishing E / L- LSPs with Bandwidth Reservation

Hello,

I have some questions in the RFC 3270 - MPLS Support of 
Differentiated Services.

What does establishing an E or L LSP with bandwidth(BW) 
reservation mean? Does it mean that the BW that has been 
'reserved', for say an L-LSP should be subtracted from the 
corresponding PSC's BW pool before performing the admission 
control for another L LSP with BW reservation request for the same 
PSC?

For example, assume a link with 10 Mbps BW reserved for a certain 
PSC. Now a request comes for a L LSP with required BW reservation 
of 5 Mbps and is admitted. Now if another L LSP request comes with 
the same PSC, and BW requirement of 7 Mbps, should I reject the 
request or accept it? (considering that I cannot adjust the queue 
weights dynamically)?

Also, what does reserving BW for an E LSP request (with multiple 
PSCs) mean? Should I then subtract the LSP's required BW from the 
total BW of the related PSCs, if I accept this LSP request? If 
yes, then how should one decide from which of the corresponding 
PSCs' BW one should subtract the BW required for that E LSP?

Please help me understand.

Regards,
Sumit


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