Cisco Networking Academy Program Semester 5 : Routing

1
Cisco Networking Academy Program Semester 5
Routing

• Chapter 3
• Routing Overview
• Routing
• Default Routing
• Floating Static Routes
• Convergence
• Route Calculation

2
Routing Overview

• Routing
• Default Routing
• Floating Static Routes
• Convergence
• Route Calculation

3
The Routing Process

• Path determination
• Route advertisement

4
Static Routing
5
Configuring Static Route

• Useful on stub networks
• Static routes are not advertised, unless properly
  redistributed.
• Should always point to the next hop address (in
  the case of shared media)

6
Dynamic Routing
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Distance Vector Protocols

• Broadcasts the whole content of the routing table
  to its neighbor at regular intervals
• Each router adds the distance to its destination
  before sending the updates
• Slow to converge
• Inefficient use of bandwidth

8
Link-State Protocols

• Multicast only the changes to the routing table
  to specific targets (Link-State Advertisements)
• Updates triggered by network changes
• Fast to converge
• Requires a lot of memory and CPU cycles
• More difficult to manage

9
Dynamic Routing
10
Hybrid Routing EIGRP

• Enhanced Interior Gateway Routing Protocol

11
The Routing Table
12
Default Routing

• Keeps routing table small

ip route 0.0.0.0 0.0.0.0 and ip default-network
(IGRP)
13
Configuring Static Default Route

• RIP Automatically redistributes default routes
  (except for IOS 12.1)
• Other protocol need redistribution
• (config-router) redistribute static
• (config-router) default-information originate
  always

14
IGRP And Default Route
(config-router) ip default-network 207.21.20.0

• Transmitted by routing updates
• Can be used on several routers
• Only for classful address
• Also works with RIP but advertised as 0.0.0.0

15
Configuring Floating Static Routes