From: Hobbs (deadheadblues@gmail.com)
Date: Mon Aug 04 2008 - 23:59:28 ART
Yes, lab it and see :-)
http://www.cisco.com/en/US/docs/ios/12_3/iproute/command/reference/ip2_s2g.html#wp1042641
On Mon, Aug 4, 2008 at 8:55 PM, Mark Stephanus Chandra <
mark.chandra@gmail.com> wrote:
> Even for the unselected Route ? (Not selected as successor and not
> selected as feasibles successor).
>
>
>
> I guess the route for unselected route, not shown with show ip eigrp
> topology.
>
>
>
> Regards
>
>
>
> *Mark Stephanus Chandra
> *IT Consultant
>
>
>
>
>
> *From:* Hobbs [mailto:deadheadblues@gmail.com]
> *Sent:* Tuesday, August 05, 2008 9:52 AM
>
> *To:* Mark Stephanus Chandra
> *Cc:* ccielab@groupstudy.com
> *Subject:* Re: EIGRP Concept
>
>
>
> Yes, "show ip eigrp topology all-links" will show you it.
>
> On Mon, Aug 4, 2008 at 8:47 PM, Mark Stephanus Chandra <
> mark.chandra@gmail.com> wrote:
>
> But Anyway, can I clarify for unselected route of feasible successor
> selection process.
>
>
>
> But typing show ip eigrp topology, we only can clarify the successor and
> feasible successor right ?
>
>
>
>
>
> /-----250-----R1-----100-----\
> / \
> Router A------300-----R2-----200--------|--------Network B
> \ /
> \-----100-----R3-----400-----/
>
>
>
>
>
> Any command to verify unselected route ? (R3 to Router A) Just to make
> sure R3 advertised that route to Router A.
>
>
>
> Regards
>
>
>
> *Mark Stephanus Chandra
> *IT Consultant
>
>
>
>
>
> *From:* Hobbs [mailto:deadheadblues@gmail.com]
> *Sent:* Tuesday, August 05, 2008 9:31 AM
>
>
> *To:* Mark Stephanus Chandra
> *Cc:* ccielab@groupstudy.com
> *Subject:* Re: EIGRP Concept
>
>
>
> Sorry. I should have said 200 < 350. 200 is from R2 to Network B. Wish this
> was a blog, I could edit it...
>
> On Mon, Aug 4, 2008 at 8:27 PM, Mark Stephanus Chandra <
> mark.chandra@gmail.com> wrote:
>
> Dear Hobbs,
>
>
>
> Many Thanks Hobbs, Still have one question :
>
>
>
> /-----250-----R1-----100-----\
> / \
> Router A------300-----R2-----200--------|--------Network B
> \ /
> \-----100-----R3-----400-----/
>
> You said :
>
>
>
> In order to be a feasible successor R2 or R3 must advertise a distance less
> than 350. Router 2 is the only one left that does this (*300*<350). So
> even though R2 and R3 are equal cost, only R2 is feasible successor.
>
>
>
> From your statement "(*300*<350)", You get metric 300 from link between R2
> and Router A, anyway, R3 ro Router A have metric 100, Why Router A doesn'r
> pick R3 to be the feasible successor the ? It has better metric.
>
>
>
> Or Maybe you mean the metric From Network B to R2 which is 200 and R3 is
> 400. Router A will choose R2 to be feasible successor.
>
>
>
> Please correct me if I'm wrong Hobbs :)
>
>
>
> Thanks a lot anyway, reallt appreciate your time doing this :)
>
>
>
>
>
>
>
>
>
> Regards
>
>
>
> *Mark Stephanus Chandra
> *IT Consultant
>
>
>
>
>
> *From:* Hobbs [mailto:deadheadblues@gmail.com]
> *Sent:* Tuesday, August 05, 2008 9:01 AM
>
>
> *To:* Mark Stephanus Chandra
> *Cc:* ccielab@groupstudy.com
> *Subject:* Re: EIGRP Concept
>
>
>
> Well I'll try, If I screw up somewhere please let me know guys:-)
>
> Suppose Router A has 3 routes to destination Network B. These routes go
> through Router1, Router2, and Router3.
>
> /-----250-----R1-----100-----\
> / \
> Router A------300-----R2-----200--------|--------Network B
> \ /
> \-----100-----R3-----400-----/
>
> These are the reported ("advertised") distances from each neighbor
>
> Router1 reports a metric of 100 to Network B
> Router2 reports a metric of 200 to Network B
> Router3 reports a metric of 400 to Network B
>
> Router A must also add its distance to each of the routers. So the total
> distance are:
>
> Router1: 100+250 = 350
> Router2: 200+300 = 500
> Router3: 400+100 = 500
>
> Router A will pick the lowest metric as it's successor, this will be the
> path through Router1. It will set the feasible distance to 350. Then for a
> feasible successor, Router A will compare the reported ("advertised")
> distance of the remaining routers to the feasible distance 350.
>
> In order to be a feasible successor R2 or R3 must advertise a distance less
> than 350. Router 2 is the only one left that does this (300<350). So even
> though R2 and R3 are equal cost, only R2 is feasible successor.
>
> The reason EIGRP does this is because it has no way of knowing if the path
> through R3 somehow goes back through itself on to network A. R3's advertised
> distance for 400 could very well include Router A's already calculated
> feasible distance of 350. EIGRP has no way of knowing this...it would be
> nice if it could!
>
> hope that explains it :-)
>
> On Mon, Aug 4, 2008 at 7:32 PM, Mark Stephanus Chandra <
> mark.chandra@gmail.com> wrote:
>
> Hi Hobbs,
>
>
>
> Thanks a lot for the explanation, buta sorry, I still don't get it.
>
>
>
> Sorry if I ask too much, but maybe it is better with a example of simple
> drawing of topology. It can help much.
>
>
>
> Regards
>
>
>
> *Mark Stephanus Chandra
> *IT Consultant
>
>
>
> *From:* Hobbs [mailto:deadheadblues@gmail.com]
> *Sent:* Tuesday, August 05, 2008 7:28 AM
> *To:* Mark Stephanus Chandra
> *Cc:* ccielab@groupstudy.com
> *Subject:* Re: EIGRP Concept
>
>
>
> Feasible successor is not better than the successor :-)
>
> It is better than the successor's reported distance (the distance as
> reported from the neighbor of the successor route).
>
> On Mon, Aug 4, 2008 at 6:14 PM, Mark Stephanus Chandra <
> mark.chandra@gmail.com> wrote:
>
> dEAR Expert,
>
>
>
> I'm kinda confuse with eigrp concept recently. Just come up in my mind.
>
>
>
> It is about a successor and feasible successor.
>
>
>
> So, In my Understanding of EIGRP concept right now :
>
>
>
> EIGRP will choose the best metric, and become Feasible Distance , right ?
>
>
>
> So If a ROUTE wants to be a feasible successor, It must have better metric
> than feasible distance, right ?
>
>
>
> So, it comes a question, so feasible successor is always better than a
> successor but a successor the one who become the primary route, Why ?
>
>
>
> Because feasible successor have better metric than successor right ?
>
>
>
> Please get me out of my confusion of EIGRP concept right here hehhee.
>
>
>
> Thanks in advance for you all
>
>
>
> Regards
>
>
>
> Mark Stephanus Chandra
> IT Consultant
> EX Computindo
>
>
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