Routing

Part 4 of the BGP series for CCNP ENCOR 350-401 v1.2: the complete 13-step best path selection algorithm with a worked tie-break at every level, the two validity gates that run before step 1, the MED comparison rule that catches everyone, hot potato routing, multipath, and four hands-on labs.

Part 3 of the BGP series for CCNP ENCOR 350-401 v1.2: the four ways to originate a prefix, why the network statement needs an exact mask match, the iBGP next-hop problem and next-hop-self, the four path attribute categories, and how weight, local preference, AS_PATH, origin, MED and communities differ in scope — with four hands-on labs.

Part 2 of the BGP series for CCNP ENCOR 350-401 v1.2: TCP 179, the six-state finite state machine, the five message types, timer negotiation, eBGP multihop versus TTL security, MD5 authentication, and a four-layer troubleshooting method with four hands-on labs.

Part 1 of a four-part BGP series for CCNP ENCOR 350-401 v1.2: why BGP is a policy protocol rather than a metric protocol, autonomous systems and ASN ranges, the rules that separate eBGP from iBGP, the iBGP full-mesh and next-hop problems, BGP's three tables, and four hands-on labs with answers.