Re: Eigrp SUmmarization

From: Fahad Khan (fahad.khan@gmail.com)
Date: Wed Aug 13 2008 - 08:23:20 ART

Dear Mark,

First tell me quickly, are u getting summary route installed in SW2's
routing table? and what is that route?

On 8/13/08, Mark Stephanus Chandra <mark.chandra@gmail.com> wrote:
>
> HI Fahad,
>
>
>
> Thanks for your Input,
>
>
>
> I immediately test on my lab environment, but the result is not what We
> Expect, please correct me if I'm Wrong.
>
>
>
> The topology is like this :
>
>
>
> R1 ------ R3 ----- SW2
>
>
>
> 1. R1 summary Route 212.18.0.0 255.255.0.0 distance 5
>
> and get this route : D 212.18.0.0/16 is a summary, 00:11:41, Null0 (As
> we agree that this route AD should be 5 right ? How to verify this ?)
>
> 2. R3 get the summary route with AD 90
>
> D 212.18.0.0/16 [90/8234010] via 162.1.13.1, 00:17:40, Serial1/1
>
> 3. And I summary this route to SW2 with this command :
>
> ip summary-address eigrp 200 212.18.0.0 255.255.0.0 5
>
> IF I get you right, this command will over rule the summary address D
> 212.18.0.0/16 [90/8234010] via 162.1.13.1, 00:17:40, Serial1/1
>
> as this summary will install in the routing table with AD 5 right ? The
> route in R3 should be D 212.18.0.0/16 is a summary, 00:11:41, Null0
>
>
>
> but As I see, the route is not change :
>
>
>
> D 212.18.0.0/16 [90/8234010] via 162.1.13.1, 00:17:40, Serial1/1
>
>
>
> DO I Miss something here ?
>
>
>
>
>
> Thanks a lot for looking into this.
>
>
>
>
>
> Regards
>
>
>
> *Mark Stephanus Chandra
> *IT Consultant
>
>
>
>
>
> *From:* Fahad Khan [mailto:fahad.khan@gmail.com]
> *Sent:* Wednesday, August 13, 2008 3:16 PM
> *To:* Mark Stephanus Chandra
> *Cc:* Hong Chan; Hobbs; ccielab@groupstudy.com
> *Subject:* Re: Eigrp SUmmarization
>
>
>
>
> Dear Mark,
>
>
>
> I posted regarding this query on19th july,08. This "distance" keyword in
> "ip summary-address eigrp" command is used to modify the AD of the discard
> route populated in the routing table when a router sends a summary route to
> its neighbour and absolutely not for modifying the AD of the routes in
> neighbour's routing table. consider this scenario,
>
>
>
> 1.1.1.1/24----(lo0)R1(s1/0)10.0.0.1-------10.0.0.2(s1/0)R2(s1/1)11.0.0.1-----11.0.0.2(s1/0)R3
>
> |
>
>
> (lo0)
> 1.1.2.1/24
>
>
>
> -R1 is sending summary (1.0.0.0/8) to R2 through "ip summ-add" command
>
>
>
> -R1 will have discard route to null0 in its routing table
>
>
>
> -R2 gets this summary with AD of 90 from R1 ( as its normal eigrp update
> for R2's perception)
>
>
>
> -if R2 needs to generate summary route(1.0.0.0/8) towards R3 through "ip
> summ-add" command, then here comes a conflit, R2 will create discard route
> entry in its routing table for 1.0.0.0/8 since it has deafilt AD of 5 and
> that will suppress the summary update got from R1. In order to prevent this
> behaivour , increase the AD of summary route more than 90 when configuring
> on R2 for R3. Then , R2 wont be having any discard route in its routing
> table and R3 will be having a summary in its routing table as 1.0.0.0/8and will be able to ping
> 1.1.2.1 and 1.1.1.1.
>
> -This is how we can play with discard route through modifing AD.
>
>
>
> HTH
>
>
>
>
> On 8/13/08, *Mark Stephanus Chandra* <mark.chandra@gmail.com> wrote:
>
> Hi Hong,
>
> The problem is, The Distance is not propagated to the neighbor router.
>
> Just like I said, whatever your distance is, the AD on your neighbor would
> still the same, which is 90
>
> On Wed, Aug 13, 2008 at 12:54 PM, Hong Chan <howard.chan34@gmail.com>
> wrote:
>
> > For my understanding, the distance is used if you 2 router doing
> > summarization and you don't want to load balance them. you can adjust 1
> of
> > the summary route to be larger than 90 on 1 of the routers which perform
> the
> > summarization. Then the router should only have 1 summary route, which is
> > learned from another summary router.
> > Please correct me if I am wrong
> > 2008/8/13 Mark Stephanus Chandra <mark.chandra@gmail.com>
> >
> >> Hi expert,
> >>
> >>
> >>
> >> I'm wondering about EIGRP summarization,
> >>
> >>
> >>
> >> IP summary address eigrp 200 192.168.10.0 255.255.255.0 160
> >>
> >>
> >>
> >> The distance value seems don't do anything.
> >>
> >>
> >>
> >> I check in my neighboring router, I have the eigrp summarization route
> >> with
> >> AD 90 (Internal).
> >>
> >>
> >>
> >> So what the distance is for in eigrp summarization
> >>
> >>
> >>
> >> Thanks
> >>
> >>
> >>
> >> Regards
> >>
> >>
> >>
> >> Mark Stephanus Chandra
> >> IT Consultant
> >>
> >>
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>
>
> --
> Mark Stephanus Chandra
> IT Consultant
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
>
>
>
>
> --
> *FAHAD KHAN**
>
> BE Computer Systems NED,
>
> CCNA,CCDA,CCNP,FOUNDFE,CLSE,QOS,JNCIA,JNCIS,MCP,CCIE (Written)
>
> Systems Support Engineer, Premier Systems (Pvt) limited,
>
> Karachi, Pakistan
>
> 92-321-2370510.*
> 

-- 
*FAHAD KHAN

BE Computer Systems NED,

CCNA,CCDA,CCNP,FOUNDFE,CLSE,QOS,JNCIA,JNCIS,MCP,CCIE  (Written)

Systems Support Engineer, Premier Systems (Pvt) limited,

Karachi, Pakistan

92-321-2370510.*

Blogs and organic groups at http://www.ccie.net

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