Port Backup Configuration
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”.
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