Dynamic Routing Protocols

Dynamic routing is the most flexible and effective approach to provide redundancy for alternative paths and the only way to detect network node, port, or link failures reliably. Routing and standby protocols rely on the simple principle that if a speaker hasn't heard from a neighbor in a certain time, something must be wrong. Load balancing over multiple links can be accomplished in several ways: BGP "pseudo" load balancing can be achieved in dual-homed Internet service provider (ISP) architectures, Multilink PPP, and link-state Equal-Cost Multi-Path (ECMP) for interior gateway protocol (IGP) paths. It is a good idea to fine-tune protocol parameters for fast-converging resilient architectures or deploy incremental SPF (iSPF). Routing provides the signaling protocols to detect and route around failures within highly meshed nondeterministic IP networks.