The MPLS WG Archive

[Curtis Villamizar <curtis@avici.com>]

In message <005801c01240$f6682080$0300000a@pacbell.net>, "Bora Akyol" writes:
> Of course overbooking is a poor man's substitute for calculating the
> equivalent capacity of the traffic that is passing through the tunnel.

wrt equivalent capacity:

How do you propose calculating the equivalent capacity of best effort
Internet traffic?  What happens to your calculation when a peer
network (ie: some other AS not under your control) loses a link and
prefers a different inter-provider interconnect?  What happens to your
equivalent capacity predictions when a hot web site or other event
appears (sports events, major news events, etc)?

There is a great deal of unpredictability in Internet traffic
patterns.

wrt overbooking:

In addition to the MPLS usage that is analogous to equivalent capacity
in ATM, overbooking is there to handle the transient traffic layout
when a fault occurs.  The layout is then gradually optimized.

Curtis