From: Ronnie Angello (ronnie.angello@gmail.com)
Date: Sun Dec 31 2006 - 13:11:53 ART
The summaries will be assigned an AD of 5 on Router B because the route is
used for advertisement purposes only. Router A is not aware of any
summarization but will accept the routes and assign them an AD of 90
since they are internal routes.
On 12/31/06, Thiago Vazquez <thiago.vazquez@uk.easynet.net> wrote:
>
> All,
>
> why sometimes EIGRP's summary routes show with AD of 5 and sometimes they
> show as an internal routes with AD 90 ?
>
> See the following scenario:
>
> Router A has a single link to Router B.
> The six addresses that Router B must advertise to Router A can be
> summarized with two aggregate addresses. See Router B's config:
>
> interface Ethernet2
> ip address 10.15.15.254 255.255.255.252
> ip summary-address eigrp 15 172.0.0.0 255.0.0.0
> ip summary-address eigrp 15 192.168.16.0 255.255.240.0
>
> See Router A's route table:
>
> Router A#show ip route
> Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
> D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
> N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
> E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
> i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
> * - candidate default, U - per-user static route, o - ODR
> P - periodic downloaded static route
> Gateway of last resort is not set
> 10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
> C 10.10.1.0/24 is directly connected, Ethernet1
> C 10.15.15.252/30 is directly connected, Ethernet0
> D 172.0.0.0/8 [90/307200] via 10.15.15.254, 00:00:57,
> Ethernet0 <<<<
> D 192.168.16.0/20 [90/2198016] via 10.15.15.254, 00:00:57,
> Ethernet0 <<<<
>
> Routes show with AD of 90.
>
> I've also Lab'ed with the summary routes being generated because the
> auto-summary command and still see the AD as 90 but all documents I found
> say that EIGRP's summary routes should have an AD of 5.
>
> Thanks, Thiago
>
> ----------------------------------------------------------------------
> Network Operations Center
> Easynet
> email: thiago.vazquez@uk.easynet.net
> team email: networks.support@uk.easynet.net
> tel.: +44 (0) 207 032 8006
> ----------------------------------------------------------------------
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Tue Jan 02 2007 - 07:50:40 ART