An Interesting description can be found at:
http://www.routergod.com/charlesmanson/
-----Original Message-----
From: Rauch, Mike [mailto:[EMAIL PROTECTED]]
Sent: Thursday, April 12, 2001 2:35 PM
To: [EMAIL PROTECTED]
Subject: RE: Static route [7:377]
I believe when you add the 255 you are changing the administrative distance
to create a floating static route. If you had a route learned by EIGRP for
instance with an administrative distance of 90 and the floating static route
with a distance of 255, the route learned by EIGRP would be used until the
link goes down. When the EIGRP route is down, the floating static route
will take over.
Please correct me if I'm wrong.
CISCO says: http://www.cisco.com/warp/public/123/backup-main.html
Floating Static Routes
Floating static routes are static routes that have an administrative
distance greater than the administrative distance of dynamic routes.
Administrative distances can be configured on a static route so that the
static route is less desirable than a dynamic route. In this manner, the
static route is not used when the dynamic route is available. However, if
the dynamic route is lost, the static route can take over, and traffic can
be sent through this alternate route. If this alternate route is provided
using a DDR interface, then that interface can be used as a backup
mechanism.
Sequence
The primary interface learns a primary route to a remote network (using a
static route or a dynamic routing protocol). The administrative distance of
this learned route is less than the floating static, thus the learned route
is used.
The primary interface becomes inoperable, although line protocol may remain
up. Loss of routing updates eventually removes the learned primary route
from the routing table.
The floating static route is used since it is now the route with the lowest
administrative distance.
Pros
This is independent of line protocol status.
It is encapsulation independent.
It can backup multliple interfaces/networks on a router.
Cons
This requires a routing protocol.
It is dependent upon the routing protocol convergence times.
It is more difficult to configure.
It can typically only provide backup for a single router.
It is dependent upon interesting traffic to trigger the DDR backup call
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=390&t=377
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