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Routing

Routing Order of Operations

The original information was taken from Cisco article on NAT Order of Operations. However, this order helps understand other features, like WCCP. 1. Routing Order of Operations If IPSec then check input access list decryption – for CET (Cisco Encryption Technology) or IPSec check input access list check URPF (Unicast …

Route Redistribution

1. Route Redistribution You can redistribute routes from one routing process to another using the redistribute command inside the destination routing process: When a routing protocol starts, it automatically redistributes connected routes that are matched by the network command. This also happens for static routes that point to an interface …

Routing over Frame Relay

1. Topologies 1.1 Full Mesh The simplest Frame Relay topology is the Full Mesh topology, where each router has a dedicated virtual circuit to another router. Unfortunately this design is rarely found in real life because each additional circuit costs. Of course, having so many circuits available makes it easy …

How the routing table is built

1. The Routing Process The routing mechanism involves three different processes: the routing protocols that build the routing table, the routing process that looks up the routing table and the forwarding process that inquires the routing process what to do with a packet. Several routing protocols can run on one …

Policy based Routing

1. In Theory Policy Routing is a feature on Cisco routers that offers greater control over paths in a network. Normal routing is done based on the routing table. The router looks up the destination address of a packet and finds out the next hop or the outgoing interface. With …