H3C Technologies H3C SR8800 - Manual (Page 24)

8
Step Command Remarks
2. Configure the
default preference
for static routes.
ip route-static default-preference default-preference-value
Optional.
60 by default.
NOTE:
•
When you configure 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, such as Ethernet interface and VLAN
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.
• For detailed information about track, see High Availability Configuration Guide.
Detecting reachability of the static route’s next hop
If a static route fails due to a topology change or a fault, traffic over the route is interrupted. To improve
reliability, the system must detect the reachability of the static route’s next hop and switch to a backup
route once the next hop is unreachable.
There are two methods for this purpose. Only one of the two methods can be used at a time.
Detecting next hop reachability through BFD
Bidirectional forwarding detection (BFD) provides a general-purpose, standard, medium- and
protocol-independent fast failure detection mechanism. It can uniformly and quickly detect the failures of
the bidirectional forwarding paths between two routers for upper-layer protocols, such as routing
protocols and Multiprotocol Label Switching (MPLS). For more information about BFD, see High
Availability Configuration Guide.
After a static route is configured, you can enable BFD to detect the reachability of the static route's next
hop.
Network requirements
To detect the reachability of the static route's next hop through BFD, you must enable BFD first. For BFD
configuration, see High Availability Configuration Guide.
Configuration procedure
To detect reachability of the static route’s next hop through BFD:
Step Command Remarks
1. Enter system view. system-view N/A