From: Thiago Vazquez (thiago.vazquez@uk.easynet.net)
Date: Sun Dec 31 2006 - 02:15:45 ART
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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