Detecting Nexthop Reachability Through Track - H3C LS-3100-52P-OVS-H3 Operation Manual

protocols and Multiprotocol Label Switching (MPLS). For details about BFD, refer to BFD Configuration
in the IP Routing Volume.
After a static route is configured, you can enable BFD to detect the reachability of the static route's
nexthop.
Network requirements
To detect the reachability of the static route's nexthop through BFD, you need to enable BFD first. For
BFD configuration, refer to BFD Configuration in the IP Routing Volume.
Configuration procedure
Follow these steps to detect reachability of the static route's nexthop through BFD:
To do...
Enter system view
Detect reachability of
the static route's
nexthop through BFD
To implement BFD in the control-packet mode, the remote end must create a BFD session;
otherwise the BFD function cannot work. To implement BFD in the echo-packet mode, the BFD
function can work without the remote end needing to create any BFD session.
If a route flap occurs, enabling BFD may worsen the flapping. Be cautious for use of this feature.

Detecting Nexthop Reachability Through Track

If you specify the nexthop but not outgoing interface when configuring a static route, you can associate
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 takes
effect.
When the track entry is negative, the static route's nexthop is unreachable and the static route is
invalid. For details about track, refer to Track Configuration in the System Volume.
Network requirements
To detect the reachability of a static route's nexthop through a Track entry, you need to create a Track
first. For detailed Track configuration procedure, refer to Track Configuration in the System Volume.
Use the command...
system-view
ip route-static dest-address { mask | mask-length }
interface-type interface-number next-hop-address [ bfd
{ control-packet | echo-packet } ] [ preference
preference-value ] [ tag tag-value ] [ description
description-text ]
ip route-static vpn-instance
s-vpn-instance-name&<1-6> dest-address { mask |
mask-length } interface-type interface-number
next-hop-address [ bfd { control-packet |
echo-packet } ] [ preference preference-value ] [ tag
tag-value ] [ description description-text ]
1-4
Remarks
—
Required
Not
configured by
default