Shulou(Shulou.com)06/02 Report--

RIP:routing information protocol (inside the enterprise)

Public standard agreement

Located at OSI layer 7, socket: UDP 520

Divided into version 1 and 2

For small networks only, because RIP delivery can only pass through up to 15 active routers (up to 16)

R1:

Router rip / / enable RIP protocol

Version 2 / / configure that the currently running RIP is version 2

No auto-summary / / turn off automatic summarization

Network 10.10.1.0

Network 192.168.12.0

# the first three must be written on each router; # network is followed by the directly connected network on each router; verify:

Show ip protocols / / View all routing protocols currently running on the device

Show ip route rip / / View RIP routes in the routing table on each router

R1

Ping 10.10.4.4 source 10.10.1.1

Any type of route has two basic properties:

Administrative distance-AD,admin distance

Indicates the stability of the route. The value range is 0-255.

The smaller the better.

Measure-Metric

Indicates the distance from the router to a route entry, with unlimited range of values

The smaller the better.

RIP-hop/ hop count

EIGRP-hybrid metric

ISIS-cost

Note:

What exists in the routing table of a router is always the "most stable" going to a destination network.

The shortest path

When a router goes to a destination network and has multiple route entries, it will select

One of the best:

# first compare AD values, the smaller the better; if the same

# secondly, compare Metric, the smaller the better; if the same

# it is all put into the routing table to form "load balancing"

By default, for RIP, for any route entry

A maximum of 4 entries are allowed to appear at the same time.

On Cisco devices, AD Metric directly connected route administrative distance, 0 static route administrative distance, 10 RIP route administrative distance 120 hop-represents the "hop count", that is, the number of routers through which the route passes during delivery

RIPv1 competes for RIPv2

1. Different transmission methods, 1 is broadcast, 2 is multicast

RIPv2 Multicast is more secure, because only 224.0.0.9 is joined.

Before you can receive RIPv2 information

Because when RIPv1 broadcasts, all devices that join this network segment can receive

RIP information, which can easily lead to the disclosure of routing entries

2. Different subnet masks, 1 does not support, 2 supports

It can be said that RIPv2 supports VLSM; but V1 does not.

3. Authentication support is different, 1 does not support, 2 supports (plaintext + ciphertext)

RIPv2 is more secure because it supports authentication

RIPv1 does not support any authentication features.

4. Tag support is different, 1 does not support, 2 supports

RIPv2 supports tagging (tag), which facilitates batch management of a large number of routes

But RIPv1 does not support it.

R1:

Router rip

Version 2

No auto-summary

Network x.x.x.x

X.x.x.x must be in the form of a primary network; # x.x.x.x represents a network scope @ this command focuses on the directly connected port on the local device @ the port where the IP address is covered by the network range represented by x.x.x.x, and enables the RIP protocol process:% this port can send RIP messages;% this port can receive RIP messages % the network part of the IP address of the port can be put into the RIP message and transmitted; for example:

Router rip

Network 10.0.0.0

Network 192.168.12.0

Interface loopback 0-> 10.10.1.1 255.255.255.0

Interface fas0/0-- > 192.168.12.1 255.255.255.0

RIP:

1. Enable the protocol

2. Configuration version 2

3. Turn off automatic summarization

4. Declare the route and send / receive

-Proclamation mode

Network

# only for direct connections

# essential commands

# this command ensures whether a physical interface can send and receive messages

This command determines whether a port can enable RIP protocol processes.

Redistribute (redistribute / republish)

# it can be used for any type of route (as long as it is in the routing table)

# but this command is only responsible for loading routes from the routing table into RIP

In the respone message

R1:

Router rip

Version 2

No auto-summary

Network 192.168.12.0

Network 10.0.0.0

!

R2:

Router rip

Version 2

No auto-summary

Network 192.168.12.0

Redistribute static / pull the static routes in the local routing table of R2 into

Into the RIP message to pass it to R1

Ip route 100.1.1.0 255.255.255.0 192.168.23.2

!

Verify the command:

Show ip protocols

Show ip rotue

Show ip route rip

Note:

In any routing protocol in the future

All routes declared by network are called internal routes.

All routes declared by redistribute are called external routes.

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