• Intra-AS exists, sort of QOSPF
• Its quite hard – (NP hard for more than
additive + 1 non additive parameter
•  throughput and jitter are all non-additive
metrics and loss and delay may be
• Inter-AS we have zilch (except hacks based
on multi-homing)
• In theory could do shortest widest or widest
shortest, but user still needs to see ful MESH
of BGP path data!