Port Backup Configuration Command Directory
The backup interface configured for
deciding whether to dial immediately when the main port protocol is down.
backup always
no backup always
parameter:
none
default:
This function is
not started.
command mode:
Interface
configuration status
Explanation:
This command is applicable only when back port is dial port. Under general condition, when the main port protocol is down, router will be noted that message can be sent from backup port. But it will not dial automatically and send message until the upper layer sends the data through this backup port. If the command is configured, the backup port will dial immediately and keeps a connective state all the time when the main port is down.
example:
The example below is configuring port backup delay on serial port
s1/0
Router_config_s1/0#backup
int a0/0
Router_config_s1/0#backup always
Choosing backup
interface and starting the function of backup. The command “no” is used for
canceling the function of backup.
backup interface slot/port
no backup interface
parameter:
Slot/port |
The type and port number of backup
interface. The backup interface can be physical interface and logic interface
of the dialer. |
default:
none
command mode:
Interface
configuration mode
Explanation:
The backup interface should be chosen by this command. When the main
port works normally, the backup port is usually under backup state and is not
under normal function. An interface can only choose another interface as its backup
interface. Repeating the execution of the above commands, the port designated
by the last command will be effective. The backup interface can only be used as
a backup port of some interface and cannot be used as a backup port of multiple
interfaces simultaneously. At the same time, the backup interface cannot be
used as the main port for setting backup interface for the purpose of avoiding
the setup of backup interface for each other or the formation of the circular
chain of backup interface. When the command “shutdown” is executed on the main
port of from the port automatically, the backup function of the port will be
forbidden.
example:
The following
example configures s1/1 port as standby port of s1/0
Router_config_s1/0#no backup interface
Configuring activation and deactivation time delay of backup
interface. The command “no” is used for setting the parameter as default value.
backup delay {enable-delay | never }
{disable-delay | never }
no backup delay
parameter:
Enable-delay |
When the main interface is down, the
backup interface is activated after the enable-delay seconds. |
Disable-delay |
When the main port is up, the backup interface
is deactivated after disable-delay seconds. |
Never |
Preventing activation or deactivation. |
default:
The delay of activation and deactivation is 0 seconds.
command mode:
Interface
configuration status
Explanation:
The backup interface shall be configured before configuring delay,
namely starting the backup function first. Inactivation and deactivation delay
always never do. So the backup function bears no practical significance.
example:
The example below configures
port backup delay on the serial port s1/0
Router_config_s1/0#backup
int s1/1
Router_config_s1/0#backup
delay 5 5
Configuring the balancing backup
function of backup interface flow. The command “no” is used for setting the
parameter as default value.
backup load {enable-threshold | never }
{disable-threshold | never}
no backup load
parameter:
enable-threshold |
The backup interface will be activated
when the ratio of the speed of the data sent or received by the main port
occupying the bandwidth of the interface exceeds the value of the
enable-threshold. |
disable-threshold |
The backup interface will be deactivated
when the proportion of the load occupying the bandwidth is less than the
value of disable-threshold. |
Never |
Preventing activation or
deactivation. |
default:
The parameter value is never, namely the balancing function of flow
is not started.
command mode:
Interface
configuration status
Explanation:
The backup
interface shall be configured first before configuring backup flow balance,
namely the backup function shall be started first. The threshold value of
setting activation backup interface shall not be smaller than that of
deactivation backup interface.
example:
The example below configures flow balance on the serial port s1/0
Router_config_s1/0#backup
int s1/1
Router_config_s1/0#backup
load 70 30
The debug information switch of port backup is used for observing
the time received in the interface of port backup function and transition
information. The command “no” is used for closing Debug information.
deubug backup
no debug backup
parameter:
none
default:
none
command mode:
supervisor mode
Explanation:
example:
The
example below opens debug information and shows the information related to port
backup function.
outer#debug backup
Router#conf
Router_config#int s1/0
Router_config_s1/0#backup int d1
Router_config_s1/0#2001-11-28 11:13:30 BACKUP Serial1/0
secondary interface Seri
al0/1 unconfigured
2001-11-28 11:13:30 BACKUP Serial0/0 changed state to
initializing
2001-11-28 11:13:30 BACKUP Serial0/0 second interface Dialer1
configured
2001-11-28 11:13:30 BACKUP Serial0/0 changed state to
NORMAL
2001-11-28 11:13:30 BACKUP Serial0/0 second interface move
to standby
show
backup
parameter:
none
default:
none
command mode:
Explanation:
Showing all the
interfaces of the configured port backup function and relevant status
information.
example:
Router_config_s1/1#show
ba
Primary Interface Secondary Interface Status
Serial1/0
Dialer1
NORMAL
Serial1/1
Dialer2
BACKUPMODE