Cisco 2521LF - 2521LF Router Uživatelský manuál stáhnout pdf (Strana 17)

6-33CSE: Networking Fundamentals — WAN Basics

www.cisco.com

Routing Decisions

– Routing protocols maintain a loop-free, single

path to each destination network

– Routes are advertised with a reachability

factor referred as a metric

– The path to the destination network is

represented by the sum of the metrics

associated with all intermediate links

– The routing process uses the metric value to

select a preferred path to each destination

• Multiple paths can be used if metric values

are equal

6-34CSE: Networking Fundamentals — WAN Basics

www.cisco.com

RIP Routing Metrics

– Routing metric used by RIP is hop count

• Using a neighboring router interface is a hop

– Routing process arbitrarily selects a path from

several possible equal metric paths

• IP load balancing is enabled by default

10.0

5.1

5.2

5.3

5.4

C 4.0 dir conn Ser0

C 5.0 dir conn Eth0

R 10.0 [120/4] via 5.2, Eth0

R 10.0 [120/4] via 5.3, Eth0

R 10.0 [120/4] via 5.4, Eth0

4.0

FDDI

These Addresses Are All Part

of the 192.168.0.0 Network

These Addresses Are All Part

of the 192.168.0.0 Network

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 51 52

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Cisco 2521LF - 2521LF Router Uživatelský manuál Strana 17