From: Brian Hescock (bhescock@xxxxxxxxx)
Date: Wed Jan 24 2001 - 17:35:52 GMT-3
You're running auto-summary on one of the routers.
On Wed, 24 Jan 2001, George Zhang wrote:
> I am reading through the "Advanced IP routing in Cisco Networks" by Terry Sl
attery. I have also been doing the labs in the book along the way. I just did
one of the two 6-router labs in Chapter 7 of the book - example 10 EIGRP and O
SPF redistribution. I used the Mentorlab 3645 to do this lab. Everything work
s as expected with only one exception. When I checked the routing table on Tok
yo and London, I saw the following route is in the routing table:
>
> In tokyo's route table:
> D EX 182.18.0.0/16 [170/2195456] via 182.18.1.2, 00:09:04, Serial0
>
>
> In London's route table:
> D EX 182.18.0.0/16 [170/2195456] via 182.18.2.1, 00:07:35, Serial1
>
> I tried to use distribute-list on router NewYork to filter it out. But it di
d not work. I guess that the first question is, should it be there? If it sho
uld be there, why? If it should not be there, how to get rid of it? It reall
y bothers me.
>
> Could someone please explain it?
>
> The configurations and route tables of the three mentioned routers are attach
ed for your info.
>
> Thanks.
>
> George
>
>
> NewYork#s
> Building configuration...
>
> Current configuration:
> !
> version 11.3
> service timestamps debug uptime
> service timestamps log uptime
> no service password-encryption
> service udp-small-servers
> service tcp-small-servers
> !
> hostname NewYork
> !
> enable password cisco
> !
> ip subnet-zero
> ip tcp synwait-time 5
> no ip domain-lookup
> !
> interface Loopback0
> ip address 172.16.253.5 255.255.255.252
> !
> interface Ethernet0
> ip address 172.16.254.2 255.255.255.0
> no ip route-cache
> no ip mroute-cache
> !
> interface Serial0
> ip address 182.18.2.1 255.255.255.0
> ip summary-address eigrp 200 172.16.0.0 255.255.0.0
> no ip route-cache
> no ip mroute-cache
> !
> interface Serial1
> ip address 182.18.1.2 255.255.255.0
> ip summary-address eigrp 200 172.16.0.0 255.255.0.0
> no ip route-cache
> no ip mroute-cache
> clockrate 1300000
> !
> router eigrp 200
> redistribute ospf 1 metric 100000 100 255 1 1500
> network 182.18.0.0
> distribute-list 2 out ospf 1
> no auto-summary
> !
> router ospf 1
> summary-address 182.18.0.0 255.255.0.0
> redistribute eigrp 200 metric 100 subnets
> network 172.16.254.2 0.0.0.0 area 0
> distribute-list 1 out eigrp 200
> !
> ip classless
> !
> access-list 1 deny 172.16.0.0
> access-list 1 permit any
> access-list 2 permit 172.16.0.0
> !
> line con 0
> exec-timeout 0 0
> privilege level 15
> password cisco
> logging synchronous
> line aux 0
> password cisco
> login
> transport input all
> line vty 0 4
> password cisco
> login
> !
> end
>
> NewYork#r
> 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, * - candidate defau
lt
> U - per-user static route, o - ODR
>
> Gateway of last resort is not set
>
> 172.16.0.0/16 is variably subnetted, 4 subnets, 2 masks
> C 172.16.254.0/24 is directly connected, Ethernet0
> C 172.16.253.4/30 is directly connected, Loopback0
> O IA 172.16.1.0/24 [110/74] via 172.16.254.1, 00:04:09, Ethernet0
> O IA 172.16.2.0/24 [110/138] via 172.16.254.1, 00:05:24, Ethernet0
> 182.18.0.0/16 is variably subnetted, 6 subnets, 2 masks
> D 182.18.4.0/24 [90/2195456] via 182.18.1.1, 00:08:28, Serial1
> D 182.18.5.0/24 [90/2195456] via 182.18.2.2, 00:08:28, Serial0
> O 182.18.0.0/16 is a summary, 00:08:25, Null0
> C 182.18.1.0/24 is directly connected, Serial1
> C 182.18.2.0/24 is directly connected, Serial0
> D 182.18.3.0/24 [90/2681856] via 182.18.1.1, 00:08:29, Serial1
> [90/2681856] via 182.18.2.2, 00:08:29, Serial0
>
> Tokyo#s
> Building configuration...
>
> Current configuration:
> !
> version 11.3
> service timestamps debug uptime
> service timestamps log uptime
> no service password-encryption
> service udp-small-servers
> service tcp-small-servers
> !
> hostname Tokyo
> !
> enable password cisco
> !
> ip subnet-zero
> ip tcp synwait-time 5
> no ip domain-lookup
> !
> !
> !
> !
> interface Ethernet0
> ip address 182.18.4.1 255.255.255.0
> no ip route-cache
> no ip mroute-cache
> !
> interface Serial0
> ip address 182.18.1.1 255.255.255.0
> no ip route-cache
> no ip mroute-cache
> !
> interface Serial1
> ip address 182.18.3.2 255.255.255.0
> no ip route-cache
> no ip mroute-cache
> clockrate 1300000
> !
> router eigrp 200
> network 182.18.0.0
> !
> ip classless
> !
> !
> line con 0
> exec-timeout 0 0
> privilege level 15
> password cisco
> logging synchronous
> line aux 0
> password cisco
> login
> transport input all
> line vty 0 4
> password cisco
> login
> !
> end
>
> Tokyo#r
> 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, * - candidate defau
lt
> U - per-user static route, o - ODR
>
> Gateway of last resort is not set
>
> 182.18.0.0/16 is variably subnetted, 6 subnets, 2 masks
> C 182.18.4.0/24 is directly connected, Ethernet0
> D 182.18.5.0/24 [90/2195456] via 182.18.3.1, 00:09:04, Serial1
> D EX 182.18.0.0/16 [170/2195456] via 182.18.1.2, 00:09:04, Serial0
> C 182.18.1.0/24 is directly connected, Serial0
> D 182.18.2.0/24 [90/2681856] via 182.18.3.1, 00:09:06, Serial1
> [90/2681856] via 182.18.1.2, 00:09:06, Serial0
> C 182.18.3.0/24 is directly connected, Serial1
>
>
> London#s
> Building configuration...
>
> Current configuration:
> !
> version 11.3
> service timestamps debug uptime
> service timestamps log uptime
> no service password-encryption
> service udp-small-servers
> service tcp-small-servers
> !
> hostname London
> !
> enable password cisco
> !
> ip subnet-zero
> ip tcp synwait-time 5
> no ip domain-lookup
> !
> !
> !
> !
> interface Ethernet0
> ip address 182.18.5.1 255.255.255.0
> no ip route-cache
> no ip mroute-cache
> !
> interface Serial0
> ip address 182.18.3.1 255.255.255.0
> no ip route-cache
> no ip mroute-cache
> !
> interface Serial1
> ip address 182.18.2.2 255.255.255.0
> no ip route-cache
> no ip mroute-cache
> clockrate 1300000
> !
> router eigrp 200
> network 182.18.0.0
> !
> ip classless
> !
> !
> line con 0
> exec-timeout 0 0
> privilege level 15
> password cisco
> logging synchronous
> line aux 0
> password cisco
> login
> transport input all
> line vty 0 4
> password cisco
> login
> !
> end
>
> London#r
> 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, * - candidate defau
lt
> U - per-user static route, o - ODR
>
> Gateway of last resort is not set
>
> 182.18.0.0/16 is variably subnetted, 6 subnets, 2 masks
> D 182.18.4.0/24 [90/2195456] via 182.18.3.2, 00:09:36, Serial0
> C 182.18.5.0/24 is directly connected, Ethernet0
> D EX 182.18.0.0/16 [170/2195456] via 182.18.2.1, 00:07:35, Serial1
> D 182.18.1.0/24 [90/2681856] via 182.18.3.2, 00:09:36, Serial0
> [90/2681856] via 182.18.2.1, 00:09:36, Serial1
> C 182.18.2.0/24 is directly connected, Serial1
> C 182.18.3.0/24 is directly connected, Serial0
>
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