From: Fahad Khan (fahad.khan@gmail.com)
Date: Sat Jul 19 2008 - 05:22:29 ART
Yeah I got every point clear after digging into different scenarios.
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 generates summary route(1.0.0.0/8) towards R3 through "ip summ-add"
command, then here comes a conflit, R3 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 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 1.0.0.0/8 and will be able to ping 1.1.2.1and
1.1.1.1.
-This is how we can play with discard route through modifing AD
My next query was about leak-map, I got the idea for that as well.
leak-map is only available on physical and virtual-template interfaces. for
configuring leak-map on sub-intefaces, use the concept of PPPoFR and bind
virtual-templates interfaces with the DLCIs in sub-interfaces.
Thanks and regards,
On 7/18/08, Anand 1871 <an1871@gmail.com> wrote:
>
> Fahad,
>
> When we summarize in EIGRP.. we automatically install a NULL route on our
> routing table. This distance refers to the AD for the NULL route installed.
> In your case, if you check the routing table of R1, you will null route
> installed for 2.2.0.0 with AD of 5.
>
> This AD is present only on the local router (R1 in your case). Others wont
> see this null route.
>
>
> It is given an AD 5.. cause you would want it to be higher than static and
> lower than other protocols.
>
> Hope the info helped.
>
> Anand
>
>
> On Sat, Jul 19, 2008 at 2:41 AM, Fahad Khan <fahad.khan@gmail.com> wrote:
>
>> Dear Experts,
>>
>> while going through eigrp summarization, i saw,
>>
>> R1(config-if)#ip summary-address eigrp 100 2.2.0.0 255.255.0.0 ?
>> *<1-255> Administrative distance*
>> leak-map Allow dynamic prefixes based on the leak-map
>> <cr>
>> In cisco command reference guide, i read that , we cant configure AD of
>> eigrp summary route and it is "5" by default. then why we have this option
>> under this command?. Although , if we change AD through this command, we
>> wont find any change any where.
>>
>>
>> further more, I saw,
>>
>> R1(config-subif)#ip summary-address eigrp 100 2.2.0.0 255.255.0.0 ?
>> <1-255> Administrative distance
>> <cr>
>>
>> In sub-interface, we do not have *leak-map* option, why?
>>
>> Can any body plz shed light over these points?
>>
>> Thanks and regards,
>> --
>> 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.
>>
>>
>> _______________________________________________________________________
>> Subscription information may be found at:
>> http://www.groupstudy.com/list/CCIELab.html
>>
>>
>>
>>
>>
>
>
-- *FAHAD KHANBE 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.*
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