HP ProCurve Secure Router 7203 dl Advanced Management And Configuration Manual page 148

Configuring Backup WAN Connections
Configuring a Persistent Backup Connection
N o t e
3-68
You can specify the local backup interface as the forwarding interface to
ensure that the route will be accurate even if the peer changes its backup IP
address. If you do enter a next hop address, remember that this address should
be that of the peer's backup interface, which like the local backup interface,
is on a different network from the primary connection. (See Figure 3-19.)
PPP 2 10.10.10.1
Router A
PPP 1 10.1.1.1
LAN
192.168.0.0/18
Figure 3-19. Floating Static Route
The floating static route is a different path to a destination for which you have
already entered a static route. You should configure the administrative dis-
tance to 2 (as opposed to the default 1 for static routes). The route will then
not be added to the route table unless the primary route becomes invalid (the
primary connection fails).
You may have configured a default route to your ISP through a forwarding
interface. If you are backing up your Internet connection, remember to add a
floating default route through the backup interface.
If your router uses routing protocols to learn routes to the remote destination,
you must enter an administrative distance for the floating static route that is
higher than the administrative distance for the routing protocol. For example,
the administrative distance for OSPF routes is 110, so you could enter this
command:
ProCurve(config)# ip route 192.168.64.0 /18 ppp 2 120
ISDN
PPP 2 10.10.10.2
T1
PPP 1 10.1.1.2
Static routes
Remote network Next hop
192.168.64.0/18 10.1.1.2
192.168.64.0/18 10.10.10.2
Router B
LAN
192.168.64.0/18
Administrative distance
1
2