From: James Bone (cciehead@yahoo.com)
Date: Mon Sep 08 2003 - 16:20:53 GMT-3
Ok Group.
Sorry I should have posted this before but I was not near the routers
:-). Here's the complete configurations of the routers.I was looking for
another way to prevent the flap without using a static route on routerc.
Thanks
James
********************************************
routerf#sh run
Building configuration...
Current configuration : 780 bytes
!
version 12.1
no service single-slot-reload-enable
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname routerf
!
!
!
!
!
!
ip subnet-zero
no ip domain-lookup
!
!
!
!
!
!
interface Ethernet0
ip address 172.16.1.2 255.255.255.0
!
interface Serial0
ip address 192.68.5.1 255.255.255.0
shutdown
no fair-queue
clockrate 64000
!
interface Serial1
no ip address
shutdown
!
interface BRI0
no ip address
shutdown
!
router ospf 10
log-adjacency-changes
network 172.16.1.0 0.0.0.255 area 0
!
router bgp 3
bgp log-neighbor-changes
network 172.16.1.0 mask 255.255.255.0
neighbor 172.16.20.1 remote-as 1
neighbor 172.16.20.1 ebgp-multihop 2
!
ip classless
ip http server
!
!
!
line con 0
line aux 0
line vty 0 4
login
!
end
routerf#
********************************************************
routera#sh run
Building configuration...
Current configuration : 789 bytes
!
version 12.1
no service single-slot-reload-enable
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname routera
!
logging rate-limit console 10 except errors
!
ip subnet-zero
no ip finger
no ip domain-lookup
!
cns event-service server
!
!
!
!
!
interface Ethernet0
ip address 172.16.1.1 255.255.255.0
!
interface Serial0
no ip address
shutdown
no fair-queue
!
interface Serial1
ip address 172.16.20.2 255.255.255.0
clockrate 64000
!
interface BRI0
no ip address
shutdown
!
router ospf 10
log-adjacency-changes
network 172.16.1.0 0.0.0.255 area 0
network 172.16.20.0 0.0.0.255 area 0
!
ip kerberos source-interface any
ip classless
no ip http server
!
!
!
line con 0
transport input none
line aux 0
line vty 0 4
login
!
end
***********************************************************
routerc#sh run
Building configuration...
Current configuration : 709 bytes
!
version 12.1
no service single-slot-reload-enable
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname routerc
!
!
!
!
!
!
ip subnet-zero
no ip domain-lookup
!
!
!
!
!
!
interface Serial0
ip address 172.16.20.1 255.255.255.0
no fair-queue
!
interface Serial1
no ip address
shutdown
!
interface TokenRing0
no ip address
shutdown
!
router ospf 10
log-adjacency-changes
network 172.16.20.0 0.0.0.255 area 0
!
router bgp 1
bgp log-neighbor-changes
neighbor 172.16.1.2 remote-as 3
neighbor 172.16.1.2 ebgp-multihop 2
!
ip classless
ip route 172.16.1.2 255.255.255.255 172.16.20.2
ip http server
!
!
!
line con 0
line aux 0
line vty 0 4
login
!
end
*******************************************************
Routerc table with the static route on routerc
routerc#
routerc#sh 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
172.16.0.0/16 is variably subnetted, 3 subnets, 2 masks
C 172.16.20.0/24 is directly connected, Serial0
B 172.16.1.0/24 [20/0] via 172.16.1.2, 00:10:20
S 172.16.1.2/32 [1/0] via 172.16.20.2
routerc#
*********************************************************
Router c table without the static route. As can be seen
routerc#sh 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
172.16.0.0/24 is subnetted, 2 subnets
C 172.16.20.0 is directly connected, Serial0
B 172.16.1.0 [20/0] via 172.16.1.2, 00:00:56 ***************Here
it just about to flap to OSPFas can be seen below
routerc#sh 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
172.16.0.0/24 is subnetted, 2 subnets
C 172.16.20.0 is directly connected, Serial0
O 172.16.1.0 [110/74] via 172.16.20.2, 00:00:00, Serial0
*********** BGP disappears
routerc#
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