From: Danny Muizebelt (Danny.Muizebelt@osiatis.at)
Date: Mon Oct 17 2005 - 04:55:08 GMT-3
Hmm.... I believe static routing is a routing protocol too. Though not so dynamic as dynamic routing protocols. Cisco believes this to be also.
From: http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/routing.htm
"Static Versus Dynamic
Static routing algorithms are hardly algorithms at all, but are table mappings established by the network administrator before the beginning of routing. These mappings do not change unless the network administrator alters them. Algorithms that use static routes are simple to design and work well in environments where network traffic is relatively predictable and where network design is relatively simple."
I guess you could say the network administrator is the dynamic part with static routing. Horrible network convergence times those guys have compared to a dynamic routing protocol. ;)
-Danny
> -----Urspr|ngliche Nachricht-----
> Von: nobody@groupstudy.com [mailto:nobody@groupstudy.com] Im Auftrag
> von istong@stong.org
> Gesendet: Samstag, 15. Oktober 2005 02:14
> An: Howard C. Berkowitz; Cisco certification
> Betreff: Re: Router with out any routing Protocol
>
> Howard,
>
> Great points. Just the other day a coworker asked how a
> router can "route" packets without a routing protocol or
> without specifying ip routing in the config. The answer was
> as you mentioned - the router can forward packets based on
> statics (and I added also via connected interfaces)
>
> Ian
> www.ccie4u.com
>
>
>
>
> > May I pause/digress slightly to review some terminology
> > that may be confusing things? Cisco terminology for
> > things that routers do sometimes are obsolescent by
> > current IETF definitions, but have come to be accepted
> > within the Cisco world, especially when they have been in
> > older training or products.
> >
> > The core functionality of devices called "routers" (e.g.,
> > see RFC 1812), is forwarding packets based on IP header
> > information. The first routers from the early vendors did
> > all related processing in a single CPU. This processor
> > both "drew the map" (i.e., built the routing table from
> > hardware, static and dynamic information) and then
> > "directed traffic", forwarding packets based on the
> > routing table.
> >
> > In current IETF terminology, "routing" always involves a
> > "control" plane that builds the routing table (i.e.,
> > routing information base) and possibly separate
> > forwarding information base(s), and a "forwarding"
> > (sometimes "data") plane that actually moves packets from
> > ingress to egress. In the never-ending search for higher
> > performance, Cisco first split the control and forwarding
> > planes into different processors of the AGS+.
> >
> > This first dual-path implementation was called autonomous
> > switching, and continued into the 7000, where hardware
> > upgrades resulted in a functionally equivalent mode
> > called silicon switching. On the 7500, optimum switching
> > still used two processors, one for control and one for
> > forwarding, but the introduction of VIPs allowed one (plus
> > hot standby) control processor and multiple forwarding
> > processors.
> >
> > Where am I going with this? I am going to the observation
> > that the command "no ip routing" really should be "no ip
> > forwarding". The presence or absence of a routing
> > protocol is independent of whether or not the router will
> > forward based on IP header information. An entire routing
> > table could be built from static routes, and the router
> > would happily forward.
> >
> > __________________________________________________________
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>
> Ian Stong
> http://www.ccie4u.com
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>
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