From: Richard Dumoulin (Richard.Dumoulin@vanco.fr)
Date: Wed Sep 29 2004 - 13:50:27 GMT-3
I would say it is your first option. Look from the source to the
destination,
--Richard
-----Message d'origine-----
De : mani poopal [mailto:mani_ccie@yahoo.com]
Envoyi : Wednesday, September 29, 2004 2:41 PM
@ : Geert Nijs; Erick Bergquist; Jonathan R. Charles; ccielab@groupstudy.com
Objet : RE: EIGRP METRIC
R1so----------------s0,R2,s1---------------------s0,R3,s1---------HostA
Hi Guys,
According to aboeve exibit what is the sum of delays for R1 to Host
A(routing table of R1), is it (R1s0 delay+R2 s1 delay+ R3 s1 delay) or (R2
s0 delay+R3 s0 delay).
thanks
Mani
Geert Nijs <geert.nijs@simac.be> wrote:
I find this strange. The bandwidth used to calculate the metric in EIGRP is
the MINIMUM bandwidth
along the PATH. So if there is a slow link in between , EIGRP should take
notice of that.
The DELAY btw is the AGGREGATE delay of all links in the path...
Also see this link:
http://www.cisco.com/en/US/partner/tech/tk365/tk207/technologies_white_paper
09186a0080094cb7.shtml#theoryofoperation
Regards,
Geert
Building the Topology Table
Now that these routers are talking to each other, what are they talking
about? Their topology tables, of course! EIGRP, unlike RIP and IGRP, does
not rely on the routing (or forwarding) table in the router to hold all of
the information it needs to operate. Instead, it builds a second table, the
topology table, from which it installs routes in the routing table.
Note: As of Cisco IOS versions 12.0T and 12.1, RIP maintains its own
database from which it installs routes into the routing table.
To see the basic format of the topology table on a router running EIGRP,
issue the show ip eigrp topology command. The topology table contains the
information needed to build a set of distances and vectors to each reachable
network, including:
* lowest bandwidth on the path to this destination as reported by the
upstream neighbor
* total delay
* path reliability
* path loading
* minimum path maximum transmission unit (MTU)
* feasible distance
* reported distance
* route source (external routes are marked)
________________________________
From: nobody@groupstudy.com on behalf of Erick Bergquist
Sent: Wed 9/29/2004 7:23
To: Jonathan R. Charles; ccielab@groupstudy.com
Subject: RE: EIGRP METRIC
Couldn't you have adjusted the delay on the interface
to influence the routing?
Erick
--- "Jonathan R. Charles"
wrote:
> I ran into an interesting problem, I had a customer
> who had a looped
> topology (with multiple paths to destinations). We
> needed to influence the
> path selection criteria...
>
> What we ended up doing is fudging the bandwidth
> statements, labeling a T1 as
> having 500MB of speed to offset paths on fast
> Ethernet that would have to
> use a slower WAN link (768k).
>
> I found it interesting that EIGRP is too stupid to
> realize that a link to a
> destination may be MUCH slower than its immediately
> connected link:
>
> For example:
>
> 100mb - 768k - 768k - 10mb is preferred over:
>
> 1.5MB ptp...
>
> The only fix (without using PBR which would have
> been far too complex to set
> up over the phone) was to manipulate BW...
>
>
>
>
> Jonathan
>
> -----Original Message-----
> From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com] On Behalf Of
> Ozgur Ocal
> Sent: Monday, September 27, 2004 23:59
> To: mani_ccie@yahoo.com; Matt.Seppeler@InetX.com;
> ccielab@groupstudy.com
> Subject: RE: EIGRP METRIC
>
> You may change the BW(intf command) as well to
> change metric of eigrp, but
> this may effect other routing protocols. Preferred
> parameter to adjust for
> eigrp is delay.
>
>
>
> cheers,
>
> Oscar
>
>
> >From: mani poopal
> >Reply-To: mani poopal
> >To: Matthew Seppeler ,
> ccielab@groupstudy.com
> >Subject: RE: EIGRP METRIC
> >Date: Mon, 27 Sep 2004 12:49:51 -0700 (PDT)
> >
> >Thanks Matt,
> >
> >I thought we could use offset list to change the
> metric of eigrp too.
> >
> >Mani
> >
> >Matthew Seppeler wrote:
> >Mani,
> >
> >One way I know of changing the metric in EIGRP is
> via the delay command
> >in interface configuration mode. To see the default
> delay, use the show
> >interfaces command.
> >
> >Matt Seppeler
> >InterNetwork Experts
> >Email: mseppeler@inetx.com
> >
> >
> >-----Original Message-----
> >From: mani poopal [mailto:mani_ccie@yahoo.com]
> >Sent: Sunday, September 26, 2004 9:23 PM
> >To: ccielab@groupstudy.com
> >Subject: EIGRP METRIC
> >
> >Hi Group,
> >
> >I tried to change eigrp metric from a neighbor
> using following two
> >commands, but I couldn't achieve the desired
> result, I would like to
> >know the mistake I am making. Any feed back is
> appreciated(I know I
> >could adjust bandwidth and delay to modify metrics
> of eigrp)
> >
> >R1 s0 -----------------eigrp 100--------------- s0
> R2
> >
> >R2
> >int s 0
> >offset-list 0 in 5555 interface serial 0
> >PS: I thought R2 should change the metric of all
> learned
> >routes(offset-list 0) to 5555. I even applied
> following command on R1,
> >offset-list 0 out 5555 serial 0. I know that I
> could have chaged delay
> >at R1, S0 or link bandwidth, but I wanted to see
> the result by using
> >offset list command. In RIP this command modifies
> the metric, hop
> >count. In EIGRP this command must change the
> composite metric.
> >
> >thanks in advance
> >
> >Mani
> >
> >
> >B.ENG,A+,CCNA,CCNP,CCNP-VOICE, CSS1,CNA,MCSE
> >(416)431 9929
> >MANI_CCIE@YAHOO.COM
> >
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