Specifications

split-horizon poison
SecureStack C3 Configuration Guide 16-9
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:C3(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.
Example
ThisexampleshowshowtodisablesplithorizonpoisonreverseforRIPpacketstransmittedon
theVLAN1interface:
C3(su)->router(Config)#router rip
C3(su)->Router1(Config-router)#no split-horizon poison
passive-interface
UsethiscommandtopreventRIPfromtransmittingupdatepacketsonaninterface.Thenoform
ofthiscommanddisablespassiveinterface.
Syntax
passive-interface vlan vlan-id
no passive-interface vlan vlan-id
Parameters
Defaults
None.
Mode
Routerconfiguration:C3(su)‐>router(Config‐router)#
vlanvlan‐id Specifies thenum berofthe VLANtomakeapassiveinterface.ThisVLAN
mustbeconfiguredforIProutingasdescribedin“Pre‐Routing
ConfigurationTasks”onpage14‐1.