Floating Static route

A floating static route is a static route with an administrative distance higher than that of the routing protocol in use. In this way, the floating static route will only appear in the routing table if the dynamically learned route is lost.

Actually it is a backup for the Dynamic routing protocol route.

To change the Administrative Distance of a static route to 250:

RouterA(config)# ip route 172.18.0.0 255.255.0.0 172.17.1.2 250

Static routes will only remain in the routing table as long as the interface connecting to the next-hop router is up. To ensure a static route remains permantly in the routing table, even if the next-hop interface is down:

RouterA(config)# ip route 172.18.0.0 255.255.0.0 172.17.1.2 permanent

Static routes can additionally be used to discard traffic to specific networks, by directing that traffic to a virtual null interface:

RouterA(config)# ip route 10.0.0.0 255.0.0.0 null0

For Further Studies please check the following Links:-

Basic Video to understand the Floating Static route further, Please visit the Following Youtube Link
http://www.youtube.com/watch?v=jNN4Xt59pJ8

Showing Floating Static route in a Design
http://mp3king.froggypwns.com/Tcm%20266%20Hassan%20Marzouk/Lab%20manual/Pdf/Lab%203%5B1%5D.6.4.pdf

Sample Configuration PDF's
http://www.cisco.com/image/gif/paws/10212/5.pdf


Please let me know if there is any other query regarding the Floating static route we will have a discussion on the same.
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Static Route

What is Static route and how it is configured ??

Hello Everybody, We are discussing about the Staic route and routing and here is the topic called "What is Static route and how it is Configured?"

Let's start with the Static route

Static route
Manually Configured route from Source to destination is called Static routing.

Uses of Static route

Static routing can be used to define an exit point from a router when no other routes are avaliable or necessary. This is called a default route

Static routing can be used for small networks that require only one or two routes. This is often more efficient since a link is not being wasted by exchanging dynamic routing information.

Static routing is often used in complementary with dynamic routing to provide a failsafe backup in the event that a dynamic route is unavaliable.

Static routing is often used to help transfer routing information from one routing protocol to another (routing redistribution).

 

Configuring Static route with Example

To configure a static route to network 10.10.20.0/24, pointing to a next-hop router with the IP address of 192.168.100.1, type: (Note that this example is written in the Cisco IOS command line syntax and will only work on certain Cisco routers)

WAY-1

Destination network	10.10.20.0
subnet	255.255.255.0
next-hop	192.168.100.1

Router(config)# ip route 10.10.20.0 255.255.255.0 192.168.100.1

WAY-2
The other option is to define a static route with reference to the outgoing interface which is connected to the next hop towards the destination network.

Destination network	10.10.20.0
subnet	255.255.255.0
next-hop	Serial interface 0/0 (local exit)

Router(config)# ip route 10.10.20.0 255.255.255.0 Serial 0/0

Hope it clears a little bit about static routing. We will further discuss on the same.


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Static Routing ( with Exit Interface or with Next Hop IP Address)

Hello Everybody,

This is one of the Intersting topic and need to understand the Concept of Static routing with Exit Interface and with Next hop IP address.

Let's Start with the two cases we are taking as below:-

1) If you configured static route pointed to next hop IP address, for every destination forwarding router requires only L2 address of next hop IP address to rewrite the L2 frame.
Example: ip route 2.2.2.0 255.255.255.0 10.1.1.2
For routing packet to destination address 2.2.2.2, router requires L2 mac address of 10.1.1.2.

2) If you configured static route point to outgoing interface, forwarding router assume destination address is directly connected to that interface and router will try to find the L2 address of the destination by sending ARP request out of the interface to the destination address in case of Ethernet or looking for a static/dynamic map entry in the mapping table in case of frame-relay.
Example: ip route 2.2.2.0 255.255.255.0 fa0/0
For routing packet to the destination address 2.2.2.2, router assumes host 2.2.2.2 is directly connected to the interface fa0/0 and it requires L2 mac address for 2.2.2.2.

In general, interfaces can be point to point or multi-point. The above mentioned conditions work differently in scenarios of Point to point and multipoint interface.

In point to point interface, by definition two devices are directly connected, so in case if you configure static route pointing to outgoing interface or next hop IP address does not make a difference, router uses L2 address of next hop IP address of interface for routing packet to every destination address.

In multipoint interface, by definition interface can have multiple devices connected to it. So as mention above in point number two, if you configure static route point to next-hop, router need L3 to L2 resolution for each destination prefixes. Ethernet is an example of multi-point interfaces whereas Frame-relay and ATM can be multi-point interface or point to point depending on the configuration.

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