HP MSR2000/3000/4000 Router Series Layer 2 - WAN Configuration Guide
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• If no route exists, the primary link is considered to be shut down and unavailable, and the backup
link will be activated.
• After the backup link is activated successfully, the data is transferred across it. During this process,
the system periodically checks the primary link status.
• When the primary link recovers, the backup link can be brought down either immediately or when
the timer expires, depending on the related configuration.
Creating a dynamic route backup group
You can create a dynamic route backup group by using one of the following methods:
• Creating multiple dynamic route backup groups, each of which monitors a network segment.
The backup link will be activated when the route to a network segment being monitored becomes
invalid. Each dynamic route backup group can establish or tear down a link through a dialup
interface.
• Creating a dynamic route backup group to monitor multiple network segments.
The backup link will be activated when the routes to all the network segments being monitored
become invalid. When establishing the backup link, the dynamic route backup group checks for
dialup interfaces configured with the dialer route command and tries to establish the backup link
on the first matching interface. Only one backup link is established.
To create a dynamic route backup group:
Ste
p
Command
Remarks
1. Enter system view.
system-view N/A
2. Create a dynamic route
backup group, and add a
network segment to be
monitored to the group.
standby routing-group
group-number rule ip ip-address
{ mask | mask-length }
[ vpn-instance vpn-instance-name ]
By default, no dynamic route
backup group is created.
The IP address and VPN instance
specified in the standby
routing-group rule command must
be the same as those specified in
the dialer route command.
Enabling dynamic route backup on a backup interface
Before enabling dynamic route backup on a backup interface, make sure that DDR is enabled on the
interface.
To enable dynamic route backup on a backup interface:
Ste
p
Command
Remarks
1. Enter system view.
system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Enable dynamic route
backup.
standby routing-group
group-number
By default, dynamic route backup
is disabled.