H3C S5120-EI Series Configuration Manual

Also see for S5120-EI Series: Installation manual Configuration guide Configuration guide Operation manual Configuration guide

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H3C S5120-EI Series Configuration Manual Manual pdf 16 page image

16Detecting reachability of the static route’s nexthopIf a static route fails due to a topology change or a fault, the connection will be interrupted. To improvenetwork stability, the system needs to detect reachability of the static route’s next hop and switch to abackup route once the next hop is unreachable.Following method can be used to detect reachability of the static route’s next hop.Detecting nexthop reachability through trackIf you specify the nexthop, but not the outgoing interface when configuring a static route, you canassociate the static route with a track entry to check the static route validity:• When the track entry is positive, the static route's nexthop is reachable and the static route takeseffect.• When the track entry is negative, the static route's nexthop is unreachable and the static route isinvalid. For details about track, refer to Track Configuration in the High Availability ConfigurationGuide.Network requirementsTo detect the reachability of a static route's nexthop through a Track entry, you need to create a Trackfirst. For detailed Track configuration procedure, refer to Track Configuration in the High AvailabilityConfiguration Guide.Configuration procedureFollow these steps to detect the reachability of a static route's nexthop through Track:To do… Use the command… Remarks1. Enter system view system-view —2. Associate the staticroute with a track entryip route-static dest-address { mask | mask-length } next-hop-address track track-entry-number [ preferencepreference-value ] [ description description-text ]RequiredNot configuredby default• To configure this feature for an existing static route, associate the static route with a track entry. For a non-existentstatic route, configure it and associate it with a Track entry.• If a static route needs route recursion, the associated track entry must monitor the nexthop of the recursive routeinstead of that of the static route; otherwise, a valid route may be mistakenly considered invalid.Displaying and maintaining static routesTo do… Use the command… RemarksDisplay the current configuration information display current-configurationAvailable inany viewDisplay the brief information of the IP routingtable display ip routing-tableDisplay the detailed information of the IProuting table display ip routing-table verbose