Mode
Router configuration: C2(su)‐>router(Config‐router)#
Usage
By default, RIP version 2 supports automatic route summarization, which summarizes
subprefixes to the classful network boundary when crossing network boundaries. Disabling
automatic route summarization enables CIDR, allowing RIP to advertise all subnets and host
routing information on the SecureStack C2 device. To verify which routes are summarized for an
interface, use the show ip route command as described in "show ip route" on page 16‐13. The
reverse of the command re‐enables automatic route summarization.
Example
This example shows how to disable RIP automatic route summarization:
C2(su)->router(Config)#router rip
C2(su)->router(Config-router)#no auto-summary
split-horizon poison
Use this command to enable or disable split horizon poison‐reverse mode for RIP packets. The no
form of this command disables split horizon poison reverse.
Syntax
split-horizon poison
no split-horizon poison
Parameters
None.
Defaults
None.
Mode
Router configuration: C2(su)‐>router(Config‐router)#
Usage
Split horizon prevents packets from exiting through the same interface on which they were
received. Poison‐reverse explicitly indicates that a network is unreachable, rather than implying it
by not including the network in routing updates. This function is disabled by default.
Example
This example shows how to disable split horizon poison reverse for RIP packets transmitted on
the VLAN 1 interface:
C2(su)->router(Config)#router rip
C2(su)->Router1(Config-router)#no split-horizon poison
Note: This command is necessary for enabling CIDR for RIP on the SecureStack C2 device.
split-horizon poison
SecureStack C2 Configuration Guide 17-7