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split-horizon poison

SecureStack C2 Configuration Guide 17-7

Mode

Routerconfiguration:C2(su)‐>router(Config‐router)#

Usage

Bydefault,RIPversion2supportsautomaticroutesumm arization,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.

Enterasys SecureStack C2 User Manual

Questions and Answers: