Implementation; Dynamic Route Backup Configuration; Creating Dynamic Route Backup Groups - 3Com MSR 50 Series Configuration Manual

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HAPTER YNAMIC

Implementation

Dynamic Route
Backup Configuration
Creating Dynamic Route
Backup Groups
R B C
OUTE ACKUP ONFIGURATION
Allow a route to be learned by multiple links through configuring load
■
balancing
Through configuring the network segment to be monitored, a backup link can be
enabled when the primary link fails. The dynamic route backup function monitors
routes and activates a backup link in the following sequence:
1 The system monitors whether routes to the monitored network segment need to
be updated, and checks whether there is at least one valid route to the monitored
network segment.
2 If there is at least one valid route to the monitored network segment, and the
route is originated from another interface with the dynamic route backup function
disabled, the primary link is considered to be connective.
3 Otherwise, the primary link is considered to be disabled and unavailable, and the
backup link will be activated for dialup.
4 After the backup link is activated, the dialup link will transfer communication data.
When the primary link restores, the backup link can be either disconnected
immediately or disconnected after the timer expires as configured.
You can create dynamic route backup groups in one of the following two ways:
1 Create multiple dynamic route backup groups, which each monitors different
network segment. The logical relationship among these network segments is
"OR", that is, the backup link will be activated when there is no valid route to one
of these network segments. For each dynamic route backup group, a link is dialed
or hanged on a dialup interface.
2 Create a multiple dynamic route backup group to monitor multiple network
segments. The logical relationship among these network segments is "AND", that
is, the backup link will be activated when there is no valid route to any of these
network segments. When the backup link is to be activated, check whether the
dialer route command is enabled on the dialup interfaces of these monitored
network segments in sequence. The backup link is enabled on the first-checked
interface with the dialer route command enabled. Note that only one link can be
activated.
Table 18 Create dynamic route backup groups
Operation
Enter system view
Create a dynamic route
backup group and add the
network segment to be
monitored to this group
n
The IP address specified in the standby routing-rule command must be the
■
same as that specified in the dialer route command.
Command
system-view
standby routing-rule
group-number ip ip-address
{ mask | mask-length }
Description
-
Required
By default, no dynamic route
backup group is created.