06-02-2006 09:54 PM - edited 03-03-2019 03:28 AM
HI
IF I Have 4 dist connected to the coreshould i summurize from one dist or on all the dist.i have this network.
100.1.0.0
100.2.0.0
100.3.0.0
100.4.0.0
100.5.0.0
the routing protocole is EIGRP.
10XS
ALI
06-03-2006 02:52 AM
HI
on dist 1
router eigrp 100
network 10.1.0.0
no auto-summary
!
on the dist 2
router eigrp 100
network 10.2.0.0
no auto-summary
on the dist 3
router eigrp 100
network 10.3.0.0
no auto-summary
i hope u got it now.
Thanks
Mahmood
06-03-2006 03:48 AM
10xs for ur reply!
waht about the ip summary-address EIGRP 100 10.1.0.0 255.255.0.0 under the interfaces.u didn't mentioned it
10xs
06-03-2006 03:52 AM
Hi
u need not mention it beoz u r not summarizing the networks u r just advertising a single network in the core.we could have used the summary address if we had a group of contigious networks in ur dist.here there is no need for summarization.
Hope u got it now.
Thanks
Mahmood
06-03-2006 04:01 AM
HI MAHMOUD
WE SHOULD SUMARIZING THIS NETWORKS TOWARD THE CORE TO STOP EIGRP QUERIES FROM PROPAGATING BEYOND THE CORE NETWORK.WHERAS PREVENT THE CORE FROM CONFUSING.HOW DO I ACIEVE THIS FROM EACH DIST?
10XS MAHMOUD FOR UR TIME
06-03-2006 04:05 AM
HI
As u have said that u want to prevent queries from propogating from core to other networks then why dnot u summarize at the core.why r u summarizing it at dist.as u know already the commands for summarization u can implement it at the core.
Thanks
Mahmood
06-03-2006 04:13 AM
hi mahmoud!
cisco recomnded to summarize at the dist.not in the core be carefull.
10xs
06-03-2006 04:42 AM
HI
I agree with u but i think it depends on scenarios.
u r scenario is different.
Thanks
Mahmood
06-03-2006 04:48 AM
hi
if u have like my scenario,how to achive this?
10xs
06-03-2006 04:55 AM
HI
I think u need a better understanding of functions of eigrp plz dnot mind.
see as u r having different networks in the dist to it is good to advertise them individually then as a summary-route.we use summarozation if we are having a contigious networks.
so at the core u will have seprate routes for u r individual dist networks.now if u r core is connected with other networks then u can summarize the dist networks at the core to the other network.
as u r having
10.1.0.0
10.2.0.0
10.3.0.0
10.4.0.0
the summary address will be
eigrp summary-address 100 10.0.0.0 255.248.0.0
in this command we r summarizing all the above networks.
Thanks
Mahmood
06-03-2006 05:04 AM
06-03-2006 05:21 AM
Hello Ali,
So there're 2 topics for the same subject?
I'd go with:
core:
router eigrp 100
network 10.0.0.0
no auto-summary
DS1
router eigrp 100
network 10.0.0.0
passive-interface default
no passive-interface gi0/1
no auto-summary
int gi0/1
ip address
ip summary-address eigrp 100 10.3.0.0 255.255.0.0
DS2
router eigrp 100
network 10.0.0.0
passive-interface default
no passive-interface gi0/1
no auto-summary
int gi0/1
ip address
ip summary-address eigrp 100 10.2.0.0 255.255.0.0
DS3
router eigrp 100
network 10.0.0.0
passive-interface default
no passive-interface gi0/1
no auto-summary
int gi0/1
ip address
ip summary-address eigrp 100 10.4.0.0 255.255.0.0
DS4
router eigrp 100
network 10.0.0.0
passive-interface default
no passive-interface gi0/1
no auto-summary
int gi0/1
ip address
ip summary-address eigrp 100 10.5.0.0 255.255.0.0
Vlad
06-03-2006 05:25 AM
Hi
Ali
according to u r diagram i would suggest u to advertise u r networks individually.than to use summarization as u r having a discontigiuos network.
if anyone has any better solution plz do post it.
Thanks
Mahmood
06-03-2006 08:30 AM
Hello Mahmood,
Why do you think this network is discontiguous?
10.0.0.0/8 is subneted into /16 networks, but those 5 subnets are all grouped. So no auto-summary and ip summary-address eigrp would be a good option.
Vlad
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