From: Zealist Hamamd (zealist@gmail.com)
Date: Wed Aug 13 2008 - 15:10:48 ART
FYI on same topic
http://www.groupstudy.com/archives/ccielab/200708/msg01165.html
On 8/13/08, Mark Stephanus Chandra <mark.chandra@gmail.com> wrote:
>
> Hi Fahad,
>
>
>
> I have tried what you told me to do, but summary address from R1 still
> installed on R3 and it's not defeated by discard route with AD 5.
>
>
>
> Somehow the discard route AD5 doesn't appear in the routing table.
>
>
>
> R3 route :
>
>
>
> D 212.18.0.0/16 [90/8234010] via 162.1.13.1, 00:46:06, Serial1/1
>
> C 212.18.5.0/24 is directly connected, Loopback2
>
> C 212.18.4.0/24 is directly connected, Loopback1
>
>
>
> interface FastEthernet0/0
>
> ip address 162.1.38.3 255.255.255.0
>
> ip summary-address eigrp 200 212.18.0.0 255.255.0.0 91
>
> duplex half
>
> end
>
>
>
>
>
> and r3 still be able to ping loopback on R1 since Summary address not
> defeated and stil in the routing table.
>
>
>
> Sw2 also can ping all the loopback since R3 loopback have specific route
> and
> route to R1 is a summary
>
>
>
> Regards
>
>
>
> Mark Stephanus Chandra
> IT Consultant
>
>
>
>
>
> From: Fahad Khan [mailto:fahad.khan@gmail.com]
> Sent: Wednesday, August 13, 2008 8:00 PM
> To: Mark Stephanus Chandra
> Cc: Hong Chan; Hobbs; ccielab@groupstudy.com
> Subject: Re: Eigrp SUmmarization
>
>
>
> OK e.g,R1 is having loopbacks as 212.18.0.1/24,
> 212.18.1.1/24....212.18.10.1/24 and u created the summary address as
> 212.18.0.0/16 and R3 is having loopbacks as
> 212.18.11.1/24,212.18.12.1/24....212.18.20.1/24 and u send the summary as
> 212.18.0.0/16 towards SW2 , now you wont ping 212.18.0.1 or any of the
> loopbacks configured on R1 since a discard route (having AD of 5) would be
> there on R3 suppressing the summary(AD 90) got from R1. I hope you are
> getting me now. Now inorder to prevent this situation you need to increase
> the AD of discard route from 90 so that R3 can have summary form R1. that
> why u have the keyword in this "ip summary-add" command.SW2 would be able
> to
> ping all the loopbacks on R3 and R1.
>
>
>
> HTH
>
>
>
>
>
> what i am saying , the summary which R3 is getting from R1 is actually a
> simple EIGRP update for SW2 which R3 is sending to SW2. But if R3 will
> generate its own summary (of specific routes that are on R3 other then that
> on R1 but having the same major net i.e 212.18) to SW2 but "ip-summary
> add"
> command on R3, then R3 will create a discard route Ok i will try
> to
> make an exmaple for you later.
>
>
>
> On 8/13/08, Mark Stephanus Chandra <mark.chandra@gmail.com> wrote:
>
> Yes Fahad
>
>
>
> The SW 2 getting the summary address from R3 which R3 getting this from R1.
>
>
>
> I still don't understand what this distance going to effect.
>
>
>
> COuld you give me live example ?
>
>
>
> Sorry to bother you like this.
>
>
>
> Regards
>
>
>
> Mark Stephanus Chandra
> IT Consultant
>
>
>
>
>
> From: Fahad Khan [mailto:fahad.khan@gmail.com]
> Sent: Wednesday, August 13, 2008 6:56 PM
>
>
> To: Mark Stephanus Chandra
> Cc: Hong Chan; Hobbs; ccielab@groupstudy.com
> Subject: Re: Eigrp SUmmarization
>
>
>
> Remeber! this route is not due to the "ip-summary address eigrp" command
> used on R3. just do one thing, delete the "ip summary-add" commnad on R3
> for
> SW2, then check whether are u getting the same route in SW2?
>
> On 8/13/08, Mark Stephanus Chandra <mark.chandra@gmail.com> wrote:
>
> I'm Getting summary route with internal AD
>
>
>
> D 212.18.0.0/16 [90/8236570] via 162.1.38.3 <http://162.1.38.3/> ,
> 00:00:33, FastEthernet0/0
>
>
>
> Regards
>
>
>
> Mark Stephanus Chandra
> IT Consultant
>
>
>
> From: Fahad Khan [mailto:fahad.khan@gmail.com]
> Sent: Wednesday, August 13, 2008 6:23 PM
>
>
> To: Mark Stephanus Chandra
> Cc: Hong Chan; Hobbs; ccielab@groupstudy.com
> Subject: Re: Eigrp SUmmarization
>
>
>
> 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 <http://212.18.0.0/> 255.255.0.0
> <http://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 <http://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 <http://212.18.0.0/> 255.255.0.0
> <http://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 <http://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 <http://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 <http://1.1.2.1/> and 1.1.1.1
> <http://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 <http://192.168.10.0/>
> 255.255.255.0 <http://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
> >>
> >>
> >> Blogs and organic groups at http://www.ccie.net <http://www.ccie.net/>
> >>
> >> _______________________________________________________________________
> >> Subscription information may be found at:
> >> http://www.groupstudy.com/list/CCIELab.html
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
>
>
> --
> Mark Stephanus Chandra
> IT Consultant
>
>
> Blogs and organic groups at http://www.ccie.net <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.
>
>
>
>
> --
> 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
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
>
>
>
-- zealist@gmail.comBlogs and organic groups at http://www.ccie.net
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