Configuration Procedure; Detecting Reachability Of The Static Route's Nexthop; Detecting Nexthop Reachability Through Track - 3Com 4500G Family Configuration Manual

Configuration Procedure

Follow these steps to configure a static route:
To do...
Enter system view
Configure a static
route
Configure the default
preference for static
routes
When configuring a static route, the static route does not take effect if you specify the next hop
address first and then configure it as the IP address of a local interface.
If you do not specify the preference when configuring a static route, the default preference will be
used. Reconfiguring the default preference applies only to newly created static routes.
You can flexibly control static routes by configuring tag values and using the tag values in the
routing policy.
If the destination IP address and mask are both configured as 0.0.0.0 with the ip route-static
command, the route is the default route.

Detecting Reachability of the Static Route's Nexthop

If a static route fails due to a topology change or a fault, the connection will be interrupted. To improve
network stability, the system needs to detect reachability of the static route's next hop and switch to a
backup 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 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 High Availability Volume.
Use the command...
system-view
ip route-static dest-address { mask | mask-length }
{ next-hop-address | interface-type interface-number
[ next-hop-address ] } [ preference
preference-value ] [ tag tag-value ] [ description
description-text ]
ip route-static default-preference
default-preference-value
1-3
Remarks
—
Required
By default,
preference for
static routes is 60,
tag is 0, and no
description
information is
configured.
Optional
60 by default