Impact of IP Aggregation on LSPs

Jan 9, 2011

IP aggregation/sumerisation breaks an LSP into 2 segments

  • Aggregation should not be used where end-to-end LSP’s are required such as witin;
  • MPLS enabled ATM network
  • Transit BGP where core routers are not running BGP

Label allocatation and distribution in a frame-mode MPLS network follows these steps;

  • IP routing protocol build the IP routing table
  • Each LSR assigns a label to every destination in the IP routing table independently
  • LSRs announce their assigned labels to all other LSRs
  • Every LSR builds its LIB, LFIB and FIB data structures based on received labels

Rob Edwards

Northern (UK) chap focusing on platforms, automation, cloud and cloud native applications. Recovering network engineer, although it turns out networking is as important, if not more, now than before!