Configuring A Floating Static Route - HP ProCurve Secure 7000dl Series Basic Management And Configuration Manual

IP Routing—Configuring Static Routes
Configuring Static Routes
11-16
ProCurve# show ip route
C 10.2.2.0/30 is directly connected, ppp 1
C 10.3.3.0/30 is directly connected, ppp 2
C 192.168.20.0/24 is directly connected, eth 0/1
S 192.168.30.0/24 [1/0] via 10.2.2.2, ppp 1
S 0.0.0.0/0 [1/0] via 0.0.0.0, ppp 2
Administrative
distance
Figure 11-5. Static Route with a Forwarding Interface

Configuring a Floating Static Route

When the router has a redundant connection to a network, it needs two routes
to that network, one of which uses the primary interface as the forwarding
interface and one of which uses the redundant interface. However, the routing
table can only include a single active route to a particular network. (See
"Configuring Load Sharing" on page 11-20 for an exception to this rule.)
You can configure a floating static route that uses the redundant, or backup
interface, and that will only appear if the forwarding interface for the primary
route goes down. You configure the floating static route by assigning it a higher
administrative distance than that for the primary route.
For example, your router can reach remote site 192.168.115.0 /24 through the
PPP 1 interface. If this connection goes down, it can reach the remote site
through the backup PPP 2 interface. Configure the routes as follows:
ProCurve(config)# ip route 192.168.115.0 /24 ppp 1
ProCurve(config)# ip route 192.168.115.0 /24 ppp 2 2
You can also configure a floating static route that only appears when a route
discovered using a routing protocol becomes invalid and is removed from the
routing table. Simply, specify an administrative distance in the floating static
route that is higher than that for the protocol.
For example, your router has learned a route to network 192.168.115.0 /24 by
running OSPF on the PPP 1 interface. The router uses an ISDN module for
backup. Configure a floating static route through the demand interface that
will only appear if the PPP 1 interface fails:
ProCurve(config)# ip route 192.168.115.0 /24 demand 1 120
Metric Next-hop address
not specified
Forwarding interface