From: Marvin Greenlee (marvingreenlee@yahoo.com)
Date: Mon Jul 10 2006 - 08:51:09 ART
From Cisco's website:
http://www.cisco.com/en/US/products/sw/iosswrel/ps1828/products_configuration_guide_chapter09186a00800ca56e.html
"...
Cisco's EIGRP Implementation
EIGRP provides the following features:
Automatic redistributionIGRP routes can be
automatically redistributed into EIGRP, and EIGRP
routes can be automatically redistributed into IGRP.
If desired, you can turn off redistribution. You can
also completely turn off EIGRP and IGRP on the router
or on individual interfaces.
Increased network widthWith IP RIP, the largest
possible width of your network is 15 hops. When EIGRP
is enabled, the largest possible width is 224 hops.
Because the EIGRP metric is large enough to support
thousands of hops, the only barrier to expanding the
network is the transport layer hop counter. Cisco
works around this problem by incrementing the
transport control field only when an IP packet has
traversed 15 routers and the next hop to the
destination was learned by way of EIGRP. When a RIP
route is being used as the next hop to the
destination, the transport control field is
incremented as usual. ..."
Update packets include a field for hop count, as shown
in the packet detail in figures 4-7 and 4-8, from the
O'reilly book "IP Routing"
http://www.oreilly.com/catalog/iprouting/chapter/ch04.html
--- Shanky <shankyz@gmail.com> wrote:
> Hi Michael,
>
> Could you elaborate a lil on how EIGRP uses Hop
> Count ?
> AFAIK EIGRP uses BW (Lowest Along the Path) and
> Delay by default and could
> use Reliability, Load and MTU (Track Only) for
> metric computation. From the
> Distance Vector world, it uses Split horizon too but
> I am not aware of any
> situations where EIGRP uses Hop count too.
>
> Thanks
>
> Shanky
>
>
> On 7/10/06, Michael Stout
> <michaelgstout@hotmail.com> wrote:
> >
> > Hop count is used for loop prevention.
> >
> > It can also be used to limit the scope of eigrp
> reachablilty.
> >
> >
>
--------------------------------------------------------------------
> >
> > From: "sugam agrawal" <netshikhar@gmail.com>
> > Reply-To: "sugam agrawal" <netshikhar@gmail.com>
> > To: "Cisco certification"
> <ccielab@groupstudy.com>
> > Subject: Hop count with EIGRP
> > Date: Sun, 9 Jul 2006 16:52:46 +0530
> > Hi,
> >
> > What is the relation of hop-count and EIGRP.
> Though it is not used as
> > a
> > metric, can it really impact EIGRP operationIt is
> it counted by
> > EIGRP for
> > sure.
> >
> > Thanks,
> >
> > Sugam
> >
> >
>
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