Hirschmann GREYHOUND GRS1020, Reference Manual

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Redundancy
12.6 Link Backup
179
UM Config GRS
Release 8.0 09/2019
When port 2/3 returns to the active state, “no shutdown“, with
Fail back
activated, and
Fail back delay
[s]
set to 30 seconds. After the timer expires, port 2/4 first blocks the traffic and then port 2/3 starts
forwarding the traffic.
Figure 42: Link Backup example network
The following tables contain examples of parameters for Switch A set up.

Open the Switching > L2-Redundancy > Link Backup dialog.

Enter a new Link Backup pair in the table:

Click the button.
The dialog displays the Create window.

In the Primary port drop-down list, select port 2/3 .
In the Backup port drop-down list, select port 2/4 .

Click the Ok button.

In the Description textbox, enter Link_Backup_1 as the name for the backup pair.

To activate the Fail back function for the link backup pair, mark the Fail back checkbox.

Set the fail back timer for the link backup pair, enter 30 s in Fail back delay [s] .

To activate the link backup pair, mark the Active checkbox.

To enable the function, select the On radio button in the Operation frame.
enable Change to the Privileged EXEC mode.
configure Change to the Configuration mode.
interface 2/3 Change to the interface configuration mode of
interface
2/3
.
link-backup add 2/4 Creates a Link Backup instance where port
2/3
is
the primary port and port
2/4
is the backup port.
link-backup modify 2/4 description
Link_Backup_1
Specifies the string
Link_Backup_1
as the name of
the backup pair.
link-backup modify 2/4 failback-status
enable
Enable the fail back timer.
link-backup modify 2/4 failback-time 30 Specify the fail back delay time as
30
s.
link-backup modify 2/4 status enable Enable the Link Backup instance.
exit Change to the Configuration mode.
link-backup operation Enable the Link Backup function globally in the
device.
Port 2/3 Port 2/4
Port 1 Port 2
Switch A
Switch B Switch C