Friday, July 23, 2010

BSCI - Study Pointers - IS-IS

IS-IS:

  • Level 3 routing - routing between separate routing domains
  • All ES's and Level1 IS's must have a unique system ID area wide
  • IS-IS is able to have more routers in an area compared to OSPF and fewer Link-State PDU's are used.
  • In Frame-Relay, the highest local DLCI is used to elect a designated IS (if all priorities are the same)
  • the cmd R1(config-if)#isis password [password] [level] -sets authentication for a specific link, when level is not specified the default is level 1
  • an INIT state can exist is there is a mis-matched authentication config or mis-matched MTU.

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