Configuring Split Horizon And Poison Reverse; Configuring The Maximum Number Of Ecmp Routes - HPE FlexNetwork HSR6800 Configuration Manual

Configuring split horizon and poison reverse

The split horizon and poison reverse functions can prevent routing loops. If both split horizon and
poison reverse are configured, only the poison reverse function takes effect.
Enabling split horizon
Split horizon disables RIP from sending routes through the interface where the routes were learned
to prevent routing loops between adjacent routers.
On NBMA networks such as FR and X.25 where multiple VCs are configured on the primary and
secondary interfaces, disable split horizon to ensure correct route advertisement. For more
information, see Layer 2—WAN Configuration Guide.
Disabling split horizon on point-to-point links does not take effect.
To enable split horizon:
Step
Enter system view.
1.
Enter interface view.
2.
Enable split horizon.
3.
Enabling poison reverse
Poison reverse allows RIP to send routes through the interface where the routes were learned, but
the metric of these routes is always set to 16 (unreachable) to avoid routing loops between
neighbors.
To enable poison reverse:
Step
Enter system view.
1.
Enter interface view.
2.
Enable poison reverse.
3.

Configuring the maximum number of ECMP routes

Perform this task to implement load sharing over ECMP routes.
To configure the maximum number of ECMP routes:
Step
Enter system view.
1.
Enter RIP view.
2.
Configure the maximum
3.
number of ECMP routes.
Command
system-view
interface interface-type
interface-number
rip split-horizon
Command
system-view
interface interface-type
interface-number
rip poison-reverse
Command
system-view
rip [ process-id ] [ vpn-instance
vpn-instance-name ]
maximum load-balancing
number
29
Remarks
N/A
N/A
Optional.
By default, split horizon is
enabled.
Remarks
N/A
N/A
By default, poison reverse is
disabled.
Remarks
N/A
N/A
Optional.
By default, the maximum number
of ECMP routes is 8.