Ospf router types

OSPF COST R2 10 Ethernet

10

PC1

20 R1

10

20 30

10

Ethernet

R3

20

PC2

SERVER-A

30

R5 PC4

40

R4

Ethernet

PC3

SERVER-B

curcinb:\hcs\ndi\ospf-cost.vsd R.Curci 01-Oct-2002

Load Sharing (pages 109-112) • • • • •

Can be equal cost or unequal-cost Load sharing can be: per destination (fast switching), or per packet (process switch) ASIC vs CPU

OSPF Router Types • Internal Router - all interfaces in single area • Backbone Router – at least 1 interface in area 0

• Area Border Router – has interfaces in multiple areas

• Autonomous System Border Router – act as gateways between OSPF and other routing protocols

192.168.2.0 /30 192.168.2.4 /30 192.168.2.8 /30 192.168.2.12 /30 192.168.2.16 /30 192.168.2.20 /30

Quito

192.168.64.1 / 24

Lima

192.168.65.1 / 24

La Paz

192.168.66.1 / 24

LAN

192.168.0.1 /24 M1

M1 192.168.1.1 /24 LAN

192.168.1.2 /24 M2

London

192.168.128.1 /24

Paris

192.168.129.1 /24

Madrid

192.168.130.1 /24

In Quito, Lima, etc. no need to run OSPF Example for Quito router ip route 0.0.0.0 0.0.0.0 192.168.2.1 In M1, for Quito LAN, add a static route ip route 192.168.64.0 255.255.255.0 192.168.2.2 In M1 (and M2) add to OSPF routing statements Router OSPF 50 redistribute static subnets redistribute connected subnets

OSPF Redistribute • • • • • •

Lots of options Protocol type (static, RIP, EIGRP, etc.)

Metric Metric-type Route-map Subnets (do this almost always)

OSPF Virtual Link • • • •

Connect 2 areas without using area 0 Must be configured between ABRs Transit area must have full routes You must know the Router ID of end points

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