There’ve got to be some downsides
•Two
virtual circuit requirement is biggest.
We couldn’t have done it if we had lots of statics to small
customers. Ethernet easy, yet carriers
like Yipes don’t support trunking and multiple vlans. Sonet & DSXs need frame
relay encap for dlcis.
•Also
have get used to tracing & pinging within other routing
tables, & oddities about source ints
•And
what MPLS is doing can be fuzzy with core and edge routers same, like
nat net in 4 boxes.
•Plus your bgp becomes
unusual, eg Arbor mons