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Rip (Routing information protocol)

RIP belongs to IGP and is a distance vector protocol.

Rip is based on UDP and the port number is 520 (UDP protocol number 17)

Periodically send routing updates to neighbors in the form of broadcast

It passes the information of the entire routing table to the neighbors.

Metric is only related to hop count (hops)

Only equivalent load balancers are supported

Set the maximum hop count to 16hops

Split horizontally, routes received from an interface are not sent out that interface

Directly set unreachable routes to 16 hops

The update action is performed only when the network topology changes, in order to reduce the consumption of bandwidth.

Rip V1

The update is sent by broadcasting 255.255.255.255. When it crosses the boundary of the main class network, it will be automatically summarized into the main class network. It does not support VLSM, updates without mask information, and only advertises the routing information in the form of the main class network.

Rip V2

Send updates to the multicast address 224.0.0.9, which is automatically summarized by default, but you can also turn off automatic summarization for manual summarization.

R (config-router) # no auto-summary turns off automatic summarization

VLSM is supported, with mask information when updated, and routing information can only be advertised in the form of a primary network.

R (config-if) # ip rip send version 1

Set the interface to send only V1 updates

R (config-if) # ip rip receive version 2

Set the interface to receive only V2 updates

R (config-if) # ip rip send version 1 2

Set the interface to send updates to V1 V2 at the same time

This routing information will be deleted only if no routing update information has been received after the 240s.

Passive interface

R (config-router) # passive-interface loopback 0

Configure this interface as a passive interface, only receive but not send

R (config-router) # passive-interface default

Configure all interfaces on the router as passive interfaces

Unicast update

R (config) # router rip

R (config-router) # neighbor 10.1.1.1

Route summarization (configured on the egress of the route direction)

R (config-if) # ip summary-address rip 12.1.0.0 255.255.252.0

Offset list

Used to increase the metricvalue of the route

R (config) # access-list 1 permit 1.1.1.0 0.0.0.255

R (config-router) # offset-list 1 out 3 e0Uniplet0

Add 3 to the original metricvalue

Authentication configuration

R (config) # key chain R1

R (config-keychain) # key 1

R (config-keychain) # key-string cisco

R (config) # interface s0swap 0

R (config-if) # ip rip authentication key-chain R1

R (config-if) # ip rip authentication mode md5

You can use show key chain to view

Load balancing

RIP only supports equal cost load balancer. Default is 4.

R (config) # router rip

R (config-router) # maximum-paths 6

Default-information originate

R (config) # router rip

R (config-router) # default-informationoriginate

Default-network

R (config) # ip default-network 12.0.0.0 is written as main class, but not as 12.1.1.0

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