From: Jason Gardiner (gardiner@xxxxxxxxxx)
Date: Sat Dec 22 2001 - 14:12:11 GMT-3
Okay,
I haven't gone through the rest of the messages to check for responses,
but I thought I'd throw in my two cents anyways.
I know of hundreds of customers who only use static routes. A small
office that has a /24 or /25 for their workstations and a router with a
single default route to their ISP.
AFAIK, if you enter two static routes exactly the same, it equates to only
1 route. There has to be a different next hop or network in order for
both to be placed in the table.
Static routes can be used to load balance/share without the use of routing
protocols. CEF will manage this.
Sarcasm is all too prevalent and does little good. There are many
statements that I have seen in this group that on the surface seem simple
or stupid that, upon reflection, actually have a great deal of merit.
This is one of the real killers in the lab. Dismissing something as
simple or treating it too lightly is a sure way to fail.
Thanks,
Jason Gardiner
Supervisor, Engineering Services
Sprint <Insert Division Name>
"You can swim all day in the Sea of Knowledge and
still come out completely dry. Most people do."
- Norton Juster
On Thu, 20 Dec 2001 jonatale@earthlink.net wrote:
> "An IP routing protocol on R1 is required to get both static routes in the IP
> routing table." -- ya, "static routing" is they protocol (its tranport layer
is
> the keyboard)
>
> "If you enter two static routes for the same network and you
> are not using a routing protocol, then the first static route goes in the
> routing table. The second will replace the first in the routing table, if th
e
> first goes away." -- ya, maybe on [old]FreeBSD, not Cisco
>
> "All routes are static routes." -- nope, some are dynamic
>
> "Many Cisco routers are used to route traffic without using routing protocols
.
> All routes are static routes." -- doubt it, name 2
>
> are you a ccie? you must be a fast typist!
>
>
> Don Rogers wrote:
>
> > Many Cisco routers are used to route traffic without using routing protocol
s.
> > All routes are static routes. Routes are not learned or advertised. Howev
er,
> > a routing protocol is required for load balancing.
> >
> > An IP routing protocol on R1 is required to get both static routes in the I
P
> > routing table. If you enter two static routes for the same network and you
> > are not using a routing protocol, then the first static route goes in the
> > routing table. The second will replace the first in the routing table, if
the
> > first goes away.
> >
> > The IP routing protocol performs the load balancing. No routing protocol,
> > then no load balancing. When the routing protocol discovers that it no lon
ger
> > has a route to the next hop, it removes the route from the routing table.
> >
> > The default timeout on a Cisco router for an arp table is four hours.
> >
> > If you are not running a routing protocol between R1, R2, and R3, then it
may
> > take a while for R1 to discover that R2 or R3 has gone away.
> >
> > a"vr4drvr ." wrote:
> >
> > > Here's a static routing question that I need answered. I do have
> > > theories,
> > > but I need a proof positive answer. Simple scenario.
> > >
> > > R2---10.1.1.0/24
> > > R1----|
> > > R3---10.1.1.0/24
> > >
> > > 3 routers are connected to an ethernet segment. R1 has 2 static routes
> > > to
> > > the 10.1.1.0/24 network pointing to the IP address of the next hop
> > > ethernets
> > > on R2 and R3, thereby providing load balancing and fault tolerance. My
> > > question is... if an ethernet interface on R2 was to go down, how does
> > > that
> > > affect the routing from R1 to the 10.1.1.0 network? For instance, will
> > > R1
> > > drop half the traffic? How does the ARP cache on R1 impact routing, or
> > > rather, how is routing impacted by the ARP cache? Will the static route
> > >
> > > through R2 get dropped so to speak?
> > >
> > > TIA.
> > >
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