D-Link DI-1750 Reference Manual page 450

(02)load Load thresholds for line up or down transitions
(03)always Second interface always Up when primary interface down(dialer)
Please Input the code of command to be excute(0-3):1
Input 1，select interface：
Key Word:
Q(quit)
(00)Serial Serial interface
(01)Async Asynchronous interface
Please Input the code of command to be excute(0-1): 0
Note：Input backup interface here,for example Serial.
Please input a interface name:S2/0
Note：Input interface name here, for example s2/0.
Will you excuse it? (Y/N):y
Second step, once the primary interface protocol is down, the backup interface will dial immediately on
this interface. execute the command under interface configuration.
backup always
Key Word:
Q(quit)
(00)arp set arp timeout
(01)backup Modify backup parameters
(02)bandwidth Set the interface bandwidth
......
Please Input the code of command to be excute(0-35): 1 (select backup)
Key Word:
U(undo) D(default) Q(quit)
(00)delay Delays before backup line up or down transitions
(01)interface Configure an interface as a backup
(02)load Load thresholds for line up or down transitions
(03)always Second interface always Up when primary interface down(dialer)
Please Input the code of command to be excute(0-3): 3
Input 3，select always:
Will you excute it? (Y/N):y
This section provide configuration example as below(choosing a0/0 as a dialer interface):
Configure router
interface s1/0
backup interface a0/0
backup always
11.2 HSRP Configuration
11.2.1 HSRP Summarization
HSRP is a standard method of providing high-availability by providing first-hop redundancy for IP hosts
on IEEE 802's LANs. HSRP routes IP traffic without relying on the availability of any single router. It
enables a set of router interfaces to work together to present the appearance of a single virtual router or
default gateway to the hosts on a LAN.
When HSRP is configured on a network or segment, it provides a virtual Media Access Control (MAC)
address and an IP address that is shared among a group of configured routers. HSRP allows two or
more HSRP-configured routers to use the MAC address and IP network address of a virtual router. The
virtual router does not exist; it represents the common target for routers that are configured to provide
Model Name
Command
- 448 -
Function
Backup interface always setup connection to primary
interface protocol down.