Port Backup Configuration

REALIZE INFORMATION

BACKUP INTERFACE  CONFIGRATOIN TASKS LISTING

ENABLED BACKUP AND CHOOSE BACKUP INTERFACE

ENABLED BACKUP INTERFACE  DELAYING

ENABLED FLUX EQUALIZATION BACKUP

EXAMPLES OF BACKUP INTERFACE CONFIGURATIONS

This chapter will discuss how to configure interface backup, and it discusses backup functions on asynchronism serial interface ,  synchronism serial interface or ISDN interface also .

Details about the full descriptions of interface backup instructions , please refer to “ interface backup instructions referring”.  

 

REALIZE INFORMATION

    Interface backup functions can enabled Backup interface or disabled it according to statement or flux information of Primary interface .If primary interface is down because of lines and etc., backup interface will enabled auto and data can

send or receive through it instead of primary interface. It can add reliability from

source router to destination. If flux of primary interface is crowded, it can

activate backup interface also, share the data transportations to speed up data transportations. If primary interface is between “down” and “up” or flux of primary interface and backup interface are both small, backup interface can be activated but not transporting data. This can save cost of lines .The listing interfaces can be primary interface:

l         asynchronism serial port

l         ISDN  

l         synchronism serial port

       Except above types, backup interfaces include Dialer logic interface also.

BACKUP INTERFACE  CONFIGRATOIN TASK LISTING

If you want to configure interface backup in above interfaces ,you should do as follows in interface configure mode.

choose the backup interface of this interface

You can also do these tasks. These tasks are optional, can provide many uses and enforce interface backup functions. 

enabled interface backup delaying

enabled flux equalization backup

ENABLED BACKUP  AND CHOOSE BACKUP INTERFACE

To realize interface backup functions, you should configure backup interface of this interface first. You can use instructions as follows in interface configuration mode.

instructions

purpose

Backup interface slot/port

Choose backup interface of this interface

 

 

ENABLED BACKUP INTERFACE  DELAYING

Set delaying of enabled and disabled backup interface .To realize time gap between primary interface state changing and the result of state of backup interface changing.  

First step:    choose backup interface

Second step:  enabled interface backup delaying in this interface .

choose backup interface, You can use instructions as follows in interface configuration mode.

 

instructions

purpose

Backup interface slot/port

Choose backup interface of this port

 

Enabled interface backup delaying , You can use instructions as follows in interface configuration mode.

 

instructions

purpose

backup delay {enable-delay | never } {disable-delay | never }

Difine backup interface activation and deactivation delaying

 

ENABLED FLUX EQULIZATION BACKUP

FLUX EQULIZATION BACKUP function will work if real flux of primary interface pass the percentage limit, backup interface will be activated to work state. If real flux of primary interface and backup interface is less than percentage limit to primary band width , backup interface will be activated to backup state.

Enabled flux equalization backup, you should execute tasks as follows: 

First         choose backup interface

Second        enabled flux equalization of this interface

 

First   choose backup interface. You can use instructions as follows in interface configuration mode.

instructions

purpose

Backup interface slot/port

Choose backup interface of this interface

 

 

Second   enabled flux equalization of this interface. You can use instructions as follows in interface configuration mode.

instructions

purpose

Backup load (enable-threshold/never)(disable-threshold/never)

Configure interface backup flux to activate or deactivate backup interface limit.

 

 

EXAMPLES OF PORT BACKUP CONFIGURATIONS

For example:

Enabled interface backup on serial 1/0,and choose serial 1/1 as his backup interface. The time of backup interface activation and deactivation is both 5 seconds. Flux equalization setting is when true flux of primary interface pass 60% of band width , activate backup interface, while flux through both interfaces is less than 30% of band width of primary interface, activate backup interface.  

configure routers

interface s1/0

backup interface int s1/1

backup delay 5 5

backup load 70 30

 

Enabled when primary interface is down, dialing backup interface is always on connecting.

If backup interface of primary interface is normal dialing interface, when primary interface is down and backup interface does not need to send data, backup interface will not dial initiative , only dial when sending data .After enabled this ,regardless of transporting data, when primary interface is “down”, backup interface will dial at once to connect.(if you take slow dial interface as backup interface ,it is fit). 

ENABLED FLUX EQULIZATION BACKUP, you must execute tasks as follows:

First choose backup interface

Second enabled backup interface dial at once when primary interface is down.

First  choose backup interface. You can use instructions as follows in interface configuration mode.

 

 

Instructions

purpose

Backup interface slot/port

Choose backup interface of this interface

 

Second enabled backup interface dial at once when primary interface is down.

You can use instructions as follows in interface configuration mode.  

Instructions

purpose

Backup always

When primary interface is down, backup

Interface is always connecting

 

 

For an example(a0/0 as a dial interface)

configure router

interface s1/0

backup interface a0/0

backup always