FD 100/320Gbps NT and FX NT IHub Services Guide Virtual Private Routed Network ServiceIssue: 13 3HH-11985-AAAA-TQZZA 5457.10.11.4 check-zeroTable 581 check-zero command7.10.11.5 split-horizonTable 582 split-horizon commandItem DescriptionSyntax check-zero {enable | disable}no check-zeroContext configure>service>vprn>ripconfigure>service>vprn>rip>groupconfigure>service>vprn>rip>group>neighborDescription This command enables checking for zero values in fields specified to be zero by the RIPv1and RIPv2 specifications.The no form of the command disables this check and allows the receipt of RIP messages evenif the mandatory zero fields are non-zero.Default no check-zeroParameters enable — Enables checking of the mandatory zero fields in the RIPv1 and RIPv2specifications and rejecting non-compliant RIP messages.disable — Disables the checking and allows the receipt of RIP messages even if themandatory zero fields are non-zero.Item DescriptionSyntax split-horizon {enable | disable}no split-horizonContext configure>service>vprn>ripconfigure>service>vprn>rip>groupconfigure>service>vprn>rip>group>neighborDescription This command enables the use of split-horizon. RIP uses split-horizon with poison-reverse toprotect from such problems as “counting to infinity”. Split-horizon with poison reverse meansthat routes learned from a neighbor through a given interface are advertised in updates out ofthe same interface but with a metric of 16 (infinity).The split-horizon disable command enables split horizon without poison reverse. This allowsthe routes to be re-advertised on interfaces other than the interface that learned the route, withthe advertised metric equaling an increment of the metric-in value.This configuration parameter can be set at three levels: global level (applies to all groups andneighbor interfaces), group level (applies to all neighbor interfaces in the group) or neighborlevel (only applies to the specified neighbor interface). The most specific value is used. Inparticular if no value is set (no split-horizon), the setting from the less specific level is inheritedby the lower level.The no form of the command disables split-horizon command which allows the lower level toinherit the setting from an upper level.(1 of 2)
