chapter 12 hsrp v2.0.pdf

7/27/2019 Chapter 12 HSRP V2.0.PDF

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Training Objective

Understand basic principle of HSRP

HSRP Configuration


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HSRP Concept

Such as Ethernet, Toking Ring, FDDI

Hot Standby Routing Protocol

Hosts Should use the default gateway

Suitable for LANs supporting multicasting or

broadcasting

Realize fault-tolerant backup function


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Problems that HSRP Solves

When a fault happens to Route A, how can Host Aaccess Host B?

RouterA

RouterB

RouterC

HostA

HostB


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The Introducing of HSRP

Host A only knows the existence of Virtual Routerand it cannot see Router A or Router B

Host A

Router A

Active Router

Router B

Standby Router

Virtual Router

Network 192.1.1.0

E0

192.1.1.1

E0192.1.1.2

Vir tual MAC add00-E0-FC-00-5F-01

Virtual IP add 192.1.1.3


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Usage of HSRP

HostA

Host

B

IP

Router A

Active Router

Router B

Standby Router

Network1.0.0.0

E01.0.0.1

E01.0.0.2

Network3.0.0.0

Network2.0.0.0

E13.0.0.1

E12.0.0.2

Configuration of staticrouting

Such as, the static routingset by host used defaultgateway

Suitable forbroadcasting network


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HostA

Router A

ActiveRouter

Router B

StandbyRouter

VirtualRouter

Network192.1.1.0

E0192.1.1.1

E0192.1.1.2

Vi r tual MAC add0000.0007.0000.0001

Virtual IP add 192.1.1.3

HSRP Protocol

Virtual IP address and MACaddress

Active router and standby router

Periodical Hello datagram


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HSRP Status

Every s tandby group conf igured on in ter face m aybe under the fo l lowing status:

INIT - Initial status

LEARN - Virtual IP address not set

LISTEN - Monitoring activity / standby router

SPEAK - Electing Active / standby router

STANDBY- Status of standby router (only one)

ACTIVE - Status of active router (only one)


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S P E A K

H a v e n o t

r e c e i v e dH e l l od a t a g r a mf r o m t h es t a n d b y

r o u t e r a f t e r t h e s e t t i m e

l im i t

IN IT

L E A R N

L I S T E N

S T A N D B Y

A C T I V E

H S R Ps t a n d b y

g r o u p h a sn o t

c o n f i g u r e da n y v i r t u a l I P

a d d r e s s

C o n f i g u r eH S R P

s t a n d b yg r o u p o ni n t e r f a c e

H S R Ps t a n d b y

g r o u pc o n f i g u r e sv i r t u a l I Pa d d r e s s

L e a r nf r o m

d a t a g r a mo f

a u t h o r i z e da c t i v er o u t e r a b o u t

v i r t u a l I Pa d d r e s s

Have notreceived Hello

datagrams fromthe active or

standby routersafter the settimeout time

limit

S e t p r e e m p t i o nm o d e a n d h a s

a p r i o r i t y h i g h e r t h a n t h e c u r r e n t

a c t i v e r o u t e r

H a v e n o tr e c e i v e d H e l l od a t a g r a m f r o m

t h e a c t i v er o u t e r a f t e r

t h e s e t t i m o u tt i m e l i m i t

HSRP Status Transmission


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HSRP Datagram

Version Oper Code State Hello Time

Hold Time Priority Group Reserved

Authentication Data

Virtual IP Address

Datagram type Hello, Coup, Resign


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MHSRP

Several standby groups can be

configured in a same network segment

One router can participate in several

standby groups

Different interfaces can configure several

standby groups


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on gura on asList

HSRP configuration should be done under Ethernetinterface mode

HSRP configuration task list is as below:Start HSRP

Configure the router's priority in a HSRP standby groupConfigure the router to work under preemption mode in the HSRP standby group

Configure HSRP authentication

Configure HSRP timer

Configure monitoring designated interface

Configure to use the actual interface MAC addressModify virtual MAC address


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HSRP Configuration Commands

Start HSRPfunction

standby [ group-number ] ip [ virtual-ip-address ]

Set a router's priority in a standby group

standby [group-number] priority [priority-value]

Set a router to work under preemptive mode in a standby group

standby [group-number] preempt

Set the authentication of a standby group

standby [group-number] authentication [string]


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HSRP Configuration Commands

Set HSRPHello time and Hold time

standby [group-number] timers [hello-time] [hold-time]

Set the router to monitor a designated interface

standby [group-number] track interface-type interface-number [priority-reduced]

Set to use actual interface MACaddress

standby use-bia

Modify a virtual MACaddress

standby use-ovmac xx-xx-xx-xx-xx


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HSRP Monitoring and Maintenance

Show current HSRP information

show standby

Open HSRP data debugging information switch

debug standby


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Single Standby Group Configuration

C fi HSRPM it i


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Configure HSRP MonitoringDesignated Interface

M lti l St db G


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Multiple Standby GroupsConfiguration

Conf igurat ion requirements:

Realize load sharing:For instance: router A is the active router of standby group 1 and at the same time it is the

standby router of standby group 2

Router B acts exactly the opposite, it is the active router of standby group 2 and at the sametime it is the standby router of standby group 1

Some hosts use standby group 1 as their gateway, other hosts use standby group 2 as theirgateway.

In this way, the purposes of data flow load sharing and inter-standby are achieved at the sametime.


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Summary

Understand HSRP concept and i ts

appl icat ion.

Understand HSRP work ing pr inc ip le.

HSRP conf igurat ion.

chapter 12 hsrp v2.0.pdf

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