Url Helper 3 45 Serial Port Serial Port 20

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Tracing the route to 10.100.1.1 VRF info: (vrf in nameid, vrf out nameid) 1 172.31.10.2 1 msec 1 msec 1 msec 2 3 4 5 6 7 8 9 10 11.

A problem scenario is used in order to demonstrate the circumstances in which it becomes desirable to specify the interface through which the next hop IP address can be reached when you configure a static route.

Failure to do so can lead to unwanted behavior and a broken network state.

When you increase the administrative distance to a value greater than that of a dynamic routing protocol, the static route can be a safety net in the event that dynamic routing fails.

For example, Enhanced Interior Gateway Routing Protocol (EIGRP)-derived routes have a default administrative distance of 90 for internal routes and 170 for external routes.

In order to configure a static route that is overridden by an EIGRP route, specify an administrative distance that is greater than 170 for the static route.

An example of a floating static route is ip route 172.31.10.0 255.255.255.0 10.10.10.2 101.

This configuration is not recommended because when the static route points to an interface and has no next hop information, the router considers each of the hosts within the range of the route to be directly connected through that interface.

An example of such a static route is ip route 0.0.0.0 0.0.0.0 Ethernet0.

An example is ip route 0.0.0.0 0.0.0.0 Ethernet0 192.168.1.1.

You can specify the directly connected next hop address only, but this is not recommended for reasons that are described in this document.

You do not need to specify the directly connected next hop address.

You can specify the remote next hop address and the interface to which the remote next hop recurses.

For example, ip route 10.0.0.1 255.255.255.255 Serial 33 192.168.20.1.

The addition of the alternate interface enables the static route installation to become more deterministic.

In this example, the host makes a connection to the remote Internet host 10.100.1.1.

Url Helper 3 45 Serial Port Serial Port 20

The link between serial port 20 on R1 to serial port 20 on R2 is the backup link.

The backup link should only be used if the primary link fails.

This is deployed with the use of static routes that point to the primary link and the use of floating static routes that point to the backup link.

The problem in this scenario is that the floating static route is never installed in the routing table when the primary link is down.

Sending 5, 100-byte ICMP Echos to 10.100.1.1, timeout is 2 seconds: Success rate is 100 percent (55), round-trip minavgmax 737880 ms.

Tracing the route to 10.100.1.1 VRF info: (vrf in nameid, vrf out nameid) 1 172.31.10.2 1 msec 1 msec 1 msec 2 10.10.10.1 31 msec 39 msec 39 msec 3 192.168.10.2 80 msec 80 msec.

End with CNTLZ. R1(config) interface serial10 R1(config-if) shutdown R1(config-if) end R1.

Sending 5, 100-byte ICMP Echos to 10.100.1.1, timeout is 2 seconds.

Success rate is 0 percent (05) host traceroute 10.100.1.1 Type escape sequence to abort.