RIP.pdf

RIP

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RIP Implementations

Attributes

RIPv1

Original RIP implementation, limited to classful routing

(obsolete)

RIPv2

Introduced support for classless routing, authentication,

triggered updates, and multicast announcements (RFC 2453)

RIPng (RIP Next Generation)

Extends RIPv2 to support IPv6 routing (RFC 2080); functions

very similarly to RIPv2 and is subsequently as limited

Type

Distance Vector

Algorithm

Bellman-Ford

Admin Distance

120

Metric Hop count (max 15)

Standard

RFCs 2080, 2453

Protocols

IPv4, IPv6

Transport

UDP

Protocols Comparison

Authentication

Plaintext, MD5

RIPv1

RIPv2

RIPng

Multicast IP

224.0.0.9/FF02::9

IPv4

IPv6

Terminology

Admin Distance 120

120

Split Horizon

A rule that states a router may not advertise a route

back to the neighbor from which it was learned

UDP Port 520

520

521

Classless No

Yes

Route Poisoning

When a network becomes unreachable, an

update with an infinite metric is generated to

explicitly advertise the route as unreachable

Adv. Address Broadcast

224.0.0.9

FF02::9

Authentication None

Plain, MD5

None

RIPv2 Configuration

Poison Reverse

A router advertises a network as unreachable

through the interface on which it was learned

! Enable RIPv2 IPv4 routing

router rip

version 2

Timer Defaults

! Disable RIPv2 automatic summarization

no auto-summary

Update

30 sec

Flush

240 sec

Invalid

180 sec

Hold-down

180 sec

! Designate RIPv2 interfaces by network

network network

RIPv2 Interface Configuration

! Identify unicast-only neighbors

neighbor IP-address

! Configure manual route summarization

ip summary-address rip network mask

! Originate a default route

default-information originate

! Enable MD5 authentication (RIPv2 only)

ip rip authentication mode md5

ip rip authentication key-chain key-chain

! Designate passive interfaces

passive-interface {interface | default}

RIPng Interface Configuration

! Modify timers

timers basic update invalid hold flush

! Enable RIPng on the interface

ipv6 rip name enable

RIPng Configuration

! Configure manual route summarization

ipv6 rip name summary-address prefix

! Enable IPv6 routing

ipv6 unicast-routing

Troubleshooting

! Enable RIPng IPv6 routing

ipv6 router rip name

show ip[v6] protocols

show ip[v6] rip database

! Toggle split-horizon and poison-reverse

[no] split-horizon

[no] poison-reverse

show ip[v6] route rip

debug ip rip { database | events }

debug ipv6 rip [interface]

! Modify timers

timers basic update invalid hold flush

by Jeremy Stretch

v1.1

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