From: John C Edgmon (chris_edgmon@msn.com)
Date: Sun Dec 31 2006 - 13:06:23 ART
They'll have an AD of 5 on router B, but advertised as 90 to A.
>From: "Thiago Vazquez" <thiago.vazquez@uk.easynet.net>
>Reply-To: "Thiago Vazquez" <thiago.vazquez@uk.easynet.net>
>To: <ccielab@groupstudy.com>
>Subject: EIGRP - Summary Routes' Administrative Distance
>Date: Sun, 31 Dec 2006 05:15:45 -0000
>
>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
>
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