Definition

Router Information Protocol A Distance Vector Router Protocol (see below) V1 is classful (messages sent to 255.255.255.255) V2 is classless (messages sent to 224.0.0.9)

Dynamic Routing

Is the process when 2 routers share:

• networks
• remote networks
• remote routes
• routes to remote destinations

automatically.

There are 2 types of dynamic routing protocols.

RIP Versions

• Version 1
  • is only classful
  • subnet mask information is not carryed within the update process

Lab

Exchange routing information between R201, R1 and R2.

r201

Previously erased static routes (because AD = 1).

Network statement

Defines a list/range of address If an IP address is within that address, then the interface to which the IP belongs is included into RIP

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r201(config)# router rip

# Do a network statement
r201(config-router)# network 200.200.200.0

# Since Serial0/1/0 has 200.200.200.2 it will start sending
# RIP information on that interface.
r201(config-router)# write memory

Show routes:

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r201# show ip route
...

or

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r201# show ip route rip

[120/2]:

• 120: Administrative Distance (AD)
• 2: Metric (only 2 hops away from R1

Show protocols:

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r201# show ip protocols

r1

Has 2 interfaces:

• serial link
• fast ethernet

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r1 (config)# router rip

# 200.200.200.0 is a class C IP address
r1 (config-router)# network 200.200.200.0

# Since 150 is a class B (meaning /16) and RIP is classful
# we should type 150.101.0.0
r1 (config-router)# network 150.101.0.0

Debug RIP:

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r1# debug ip rip
r1# debug ip rip events

r2

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r2 (config)# router rip
r2 (config-router)# network 150.101.0.0

# 10.x and 20.x are class A (/8)
r2 (config-router)# network 10.0.0.0
r2 (config-router)# network 20.0.0.0
r2 (config-router)# write memory

Switch to RIP v2

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r201(config)# router rip
r201(config-router)# version 2

Now you should not be able to see any classes of IP address but the right classes (/24 etc.)

Eventhough v2 has been enabled, v2 shows the bigger network class (auto-summary by default).

Turn of auto-summary

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r201(config-router)# no auto-summary
r201(config-router)#do wr

Remove RIP

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r1(config)# no router rip