Configuring Split Horizon And Poison Reverse - HP MSR Series Configuration Manual

Step
3. Configure RIP timers.

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
1. Enter system view.
2. Enter interface view.
3. Enable split horizon.
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
1. Enter system view.
Enter interface view.
2.
3. Enable poison reverse.
Command
timers { garbage-collect
garbage-collect-value | suppress
suppress-value | timeout
timeout-value | update
update-value } *
Command
system-view
interface interface-type
interface-number
rip split-horizon
Command
system-view
interface interface-type
interface-number
rip poison-reverse
29
Remarks
Optional.
By default:
•
The update timer is 30 seconds.
•
The timeout timer is 180
seconds.
•
The suppress timer is 120
seconds.
•
The garbage-collect timer is
120 seconds.
Remarks
N/A
N/A
Optional.
By default, split horizon is enabled.
Remarks
N/A
N/A
By default, poison reverse is
disabled.