11-11
IP Routing—Configuring Static Routes
Overview
On the other hand, routing protocols consume bandwidth and CPU processes;
routers must exchange updates and calculate the best routes. A router that
has been carelessly configured may send updates to unauthorized devices,
opening a security vulnerability. However, a well-designed network eliminates
many of these problems.
You should not implement a dynamic routing protocol on a demand interface
that is used with a dial-up connection because the routing updates may keep
the line up longer than is necessary, costing your organization money. Instead,
configure a static route that uses the demand interface as the forwarding
interface. If you are using the dial-up connection for backup, you can configure
a floating static route. (See “Configuring a Floating Static Route” on page 11-16.)
You can use static routing in conjunction with one or more dynamic routing
protocols. A static route will always supersede a discovered route because
static routes have low administrative distance. Table 11-1 shows the default
administrative distance for the various types of routes that the ProCurve
Secure Router can learn. As you can see, besides routes to directly connected
networks, static routes are considered to be the most reliable.
Table 11-1. Hierarchy of Routes (Most Trusted to Least Trusted)
Load Sharing
Typically, a routing table can only include one best route for each destination.
If you enter more than one route to the same destination, the router will only
add this route to its routing table if the first route that you entered is removed
or if the forwarding interface for this route goes down. However, the ProCurve
Secure Router can also implement load sharing, which enables it to activate
up to routes to the same destination. This option enables the router to use
redundant connections to the same remote site.
Route Type Default Administrative Distance
directly connected 0
static 1
BGP • 20 for external routes
• 200 for internal and local routes
OSPF 110
RIP v1 and v2 120
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