Hi Group,
Has anyone successfully test the Jeff Doyle's BGP backdoor case study? Routing TCP/IP IIPage 234
I set up the lab and tested his configuration, it doesn't work.
After discussion with my study mate, I used Eigrp instead of rip between Meribel and Lillehammer. Guess what, it workes.
Then I turned on bgp auto summary, the backdoor command only work on Lillehammer router not Meribel. I tried different things, turned off bgp auto summary,used network command instead of redistriburion, reload the router, couldn't get work any more.
Did I missed something,
here is my config
Daniel
==============================================================================
Meribel#sh run
!
interface Loopback0
ip address 10.50.250.1 255.255.255.255
!
interface Loopback1
ip address 172.17.0.1 255.255.0.0 secondary
ip address 10.20.0.1 255.255.0.0
!
interface Loopback3
ip address 172.29.2.1 255.255.255.0
!
interface Loopback4
ip address 192.168.50.1 255.255.255.0
!
interface FastEthernet0/0
ip address 192.168.0.1 255.255.255.0
duplex auto
speed auto
!
!
interface Serial0/1
bandwidth 64
ip address 192.168.1.1 255.255.255.0
!
router eigrp 100
network 10.20.0.0 0.0.255.255
network 172.17.0.0
network 172.29.2.0 0.0.0.255
network 192.168.1.0
network 192.168.50.0
auto-summary
no eigrp log-neighbor-changes
!
router bgp 50
bgp log-neighbor-changes
network 172.18.0.0 backdoor
redistribute eigrp 100
neighbor 10.75.100.1 remote-as 75
neighbor 10.75.100.1 ebgp-multihop 2
neighbor 10.75.100.1 update-source Loopback0
neighbor 10.100.83.1 remote-as 100
neighbor 10.100.83.1 ebgp-multihop 2
neighbor 10.100.83.1 update-source Loopback0
neighbor 10.200.60.1 remote-as 200
neighbor 10.200.60.1 ebgp-multihop 2
neighbor 10.200.60.1 update-source Loopback0
no auto-summary
!
ip kerberos source-interface any
ip classless
ip route 10.75.100.1 255.255.255.255 FastEthernet0/0
ip route 10.100.83.1 255.255.255.255 FastEthernet0/0
ip route 10.200.60.1 255.255.255.255 FastEthernet0/0
no ip http server
!
end
Meribel#
Meribel#sh ip rout
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
B 192.168.75.0/24 [20/0] via 10.75.100.1, 00:06:24
C 172.17.0.0/16 is directly connected, Loopback1
D 172.18.0.0/16 [90/40640000] via 192.168.1.2, 00:01:49, Serial0/1
172.29.0.0/16 is variably subnetted, 2 subnets, 2 masks
D 172.29.0.0/16 is a summary, 00:09:28, Null0
C 172.29.2.0/24 is directly connected, Loopback3
10.0.0.0/8 is variably subnetted, 6 subnets, 3 masks
D 10.0.0.0/8 is a summary, 00:09:28, Null0
C 10.20.0.0/16 is directly connected, Loopback1
S 10.75.100.1/32 is directly connected, FastEthernet0/0
S 10.100.83.1/32 is directly connected, FastEthernet0/0
C 10.50.250.1/32 is directly connected, Loopback0
S 10.200.60.1/32 is directly connected, FastEthernet0/0
C 192.168.0.0/24 is directly connected, FastEthernet0/0
C 192.168.50.0/24 is directly connected, Loopback4
C 192.168.1.0/24 is directly connected, Serial0/1
Meribel#
==============================================================================
Lillehammer#sh run
!
!
interface Loopback0
ip address 10.75.100.1 255.255.255.255
!
interface Loopback1
ip address 172.18.0.1 255.255.0.0
!
interface Loopback2
ip address 192.168.75.1 255.255.255.0
!
interface FastEthernet0/0
ip address 192.168.0.2 255.255.255.0
duplex auto
speed auto
!
interface Serial0/0
no ip address
shutdown
no fair-queue
!
interface Serial0/1
bandwidth 64
ip address 192.168.1.2 255.255.255.0
clockrate 64000
!
router eigrp 100
network 172.18.0.0
network 192.168.1.0
network 192.168.75.0
auto-summary
no eigrp log-neighbor-changes
!
router bgp 75
bgp log-neighbor-changes
network 172.17.0.0 backdoor
network 172.18.0.0
network 192.168.75.0
neighbor 10.50.250.1 remote-as 50
neighbor 10.50.250.1 ebgp-multihop 2
neighbor 10.50.250.1 update-source Loopback0
neighbor 10.100.83.1 remote-as 100
neighbor 10.100.83.1 ebgp-multihop 2
neighbor 10.100.83.1 update-source Loopback0
neighbor 10.200.60.1 remote-as 200
neighbor 10.200.60.1 ebgp-multihop 2
neighbor 10.200.60.1 update-source Loopback0
no auto-summary
!
ip classless
ip route 10.50.250.1 255.255.255.255 FastEthernet0/0
ip route 10.100.83.1 255.255.255.255 FastEthernet0/0
ip route 10.200.60.1 255.255.255.255 FastEthernet0/0
ip http server
!
!
end
Lillehammer#
Lillehammer#sh ip rout
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
C 192.168.75.0/24 is directly connected, Loopback2
B 172.17.0.0/16 [20/0] via 10.50.250.1, 00:06:15
C 172.18.0.0/16 is directly connected, Loopback1
B 172.29.0.0/16 [20/0] via 10.50.250.1, 00:05:47
10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks
B 10.0.0.0/8 [20/0] via 10.50.250.1, 00:05:47
C 10.75.100.1/32 is directly connected, Loopback0
S 10.100.83.1/32 is directly connected, FastEthernet0/0
S 10.50.250.1/32 is directly connected, FastEthernet0/0
S 10.200.60.1/32 is directly connected, FastEthernet0/0
C 192.168.0.0/24 is directly connected, FastEthernet0/0
B 192.168.50.0/24 [20/0] via 10.50.250.1, 00:05:18
C 192.168.1.0/24 is directly connected, Serial0/1
Lillehammer#
=============================================================================
stoped working -- turned on auto summary
tried --- without any luck
turned off auto summary again
used network command instead of eigrp redistribution
relaod the router
=============================================================================
Meribel#sh run
Building configuration...
Current configuration : 2212 bytes
!
version 12.1
no service single-slot-reload-enable
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname Meribel
!
logging rate-limit console 10 except errors
enable password cisco
!
memory-size iomem 10
ip subnet-zero
!
!
no ip finger
no ip domain-lookup
!
call rsvp-sync
cns event-service server
!
!
!
!
!
!
!
!
interface Loopback0
ip address 10.50.250.1 255.255.255.255
!
interface Loopback1
ip address 172.17.0.1 255.255.0.0 secondary
ip address 10.20.0.1 255.255.0.0
!
interface Loopback3
ip address 172.29.2.1 255.255.255.0
!
interface Loopback4
ip address 192.168.50.1 255.255.255.0
!
interface FastEthernet0/0
ip address 192.168.0.1 255.255.255.0
duplex auto
speed auto
!
interface Serial0/0
no ip address
shutdown
no fair-queue
!
interface BRI0/0
no ip address
shutdown
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/1
bandwidth 64
ip address 192.168.1.1 255.255.255.0
!
router eigrp 100
network 10.20.0.0 0.0.255.255
network 172.17.0.0
network 172.29.2.0 0.0.0.255
network 192.168.1.0
network 192.168.50.0
no auto-summary
no eigrp log-neighbor-changes
!
router bgp 50
bgp log-neighbor-changes
network 10.20.0.0 mask 255.255.0.0
network 172.17.0.0
network 172.18.0.0 backdoor
network 172.29.2.0 mask 255.255.255.0
network 192.168.50.0
neighbor 10.75.100.1 remote-as 75
neighbor 10.75.100.1 ebgp-multihop 2
neighbor 10.75.100.1 update-source Loopback0
neighbor 10.100.83.1 remote-as 100
neighbor 10.100.83.1 ebgp-multihop 2
neighbor 10.100.83.1 update-source Loopback0
neighbor 10.200.60.1 remote-as 200
neighbor 10.200.60.1 ebgp-multihop 2
neighbor 10.200.60.1 update-source Loopback0
no auto-summary
!
ip kerberos source-interface any
ip classless
ip route 10.75.100.1 255.255.255.255 FastEthernet0/0
ip route 10.100.83.1 255.255.255.255 FastEthernet0/0
ip route 10.200.60.1 255.255.255.255 FastEthernet0/0
no ip http server
!
!
!
voice-port 3/0/0
!
voice-port 3/0/1
!
voice-port 3/1/0
!
voice-port 3/1/1
!
dial-peer cor custom
!
!
!
!
line con 0
exec-timeout 0 0
logging synchronous
transport input none
line aux 0
line vty 0 4
password cisco
login
!
end
Meribel# sh ip bgp
BGP table version is 7, local router ID is 192.168.50.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 10.20.0.0/16 0.0.0.0 0 32768 i
*> 172.17.0.0 0.0.0.0 0 32768 i
* 172.18.0.0 10.200.60.1 0 200 75 i
* 10.100.83.1 0 100 75 i
*> 10.75.100.1 0 0 75 i
*> 172.29.2.0/24 0.0.0.0 0 32768 i
*> 192.168.50.0 0.0.0.0 0 32768 i
* 192.168.75.0 10.100.83.1 0 100 75 i
* 10.200.60.1 0 200 75 i
*> 10.75.100.1 0 0 75 i
Meribel#sh ip rout
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
B 192.168.75.0/24 [20/0] via 10.75.100.1, 00:10:32
C 172.17.0.0/16 is directly connected, Loopback1
B 172.18.0.0/16 [20/0] via 10.75.100.1, 00:02:27
172.29.0.0/24 is subnetted, 1 subnets
C 172.29.2.0 is directly connected, Loopback3
10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks
C 10.20.0.0/16 is directly connected, Loopback1
S 10.75.100.1/32 is directly connected, FastEthernet0/0
S 10.100.83.1/32 is directly connected, FastEthernet0/0
C 10.50.250.1/32 is directly connected, Loopback0
S 10.200.60.1/32 is directly connected, FastEthernet0/0
C 192.168.0.0/24 is directly connected, FastEthernet0/0
C 192.168.50.0/24 is directly connected, Loopback4
C 192.168.1.0/24 is directly connected, Serial0/1
Meribel#
Meribel#sh ip eig to
IP-EIGRP Topology Table for AS(100)/ID(192.168.50.1)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 10.20.0.0/16, 1 successors, FD is 128256
via Connected, Loopback1
P 192.168.75.0/24, 0 successors, FD is Inaccessible
via 192.168.1.2 (40640000/128256), Serial0/1
P 192.168.50.0/24, 1 successors, FD is 128256
via Connected, Loopback4
P 192.168.1.0/24, 1 successors, FD is 40512000
via Connected, Serial0/1
P 172.29.2.0/24, 1 successors, FD is 128256
via Connected, Loopback3
P 172.17.0.0/16, 1 successors, FD is 128256
via Connected, Loopback1
P 172.18.0.0/16, 0 successors, FD is Inaccessible
via 192.168.1.2 (40640000/128256), Serial0/1
Meribel#
======================================================================================
Lillehammer#sh run
Building configuration...
Current configuration : 1573 bytes
!
version 12.1
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname Lillehammer
!
enable password cisco
!
!
!
!
!
memory-size iomem 15
ip subnet-zero
no ip domain-lookup
!
!
!
!
!
!
interface Loopback0
ip address 10.75.100.1 255.255.255.255
!
interface Loopback1
ip address 172.18.0.1 255.255.0.0
!
interface Loopback2
ip address 192.168.75.1 255.255.255.0
!
interface FastEthernet0/0
ip address 192.168.0.2 255.255.255.0
duplex auto
speed auto
!
interface Serial0/0
no ip address
shutdown
no fair-queue
!
interface Serial0/1
bandwidth 64
ip address 192.168.1.2 255.255.255.0
clockrate 64000
!
router eigrp 100
network 172.18.0.0
network 192.168.1.0
network 192.168.75.0
no auto-summary
no eigrp log-neighbor-changes
!
router bgp 75
bgp log-neighbor-changes
network 172.17.0.0 backdoor
network 172.18.0.0
network 192.168.75.0
neighbor 10.50.250.1 remote-as 50
neighbor 10.50.250.1 ebgp-multihop 2
neighbor 10.50.250.1 update-source Loopback0
neighbor 10.100.83.1 remote-as 100
neighbor 10.100.83.1 ebgp-multihop 2
neighbor 10.100.83.1 update-source Loopback0
neighbor 10.200.60.1 remote-as 200
neighbor 10.200.60.1 ebgp-multihop 2
neighbor 10.200.60.1 update-source Loopback0
no auto-summary
!
ip classless
ip route 10.50.250.1 255.255.255.255 FastEthernet0/0
ip route 10.100.83.1 255.255.255.255 FastEthernet0/0
ip route 10.200.60.1 255.255.255.255 FastEthernet0/0
ip http server
!
!
!
line con 0
exec-timeout 0 0
logging synchronous
line aux 0
line vty 0 4
password cisco
login
!
end
Lillehammer# sh ip bgp
BGP table version is 85, local router ID is 192.168.75.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
* 10.20.0.0/16 10.200.60.1 0 200 50 i
* 10.100.83.1 0 100 50 i
*> 10.50.250.1 0 0 50 i
* 172.17.0.0 10.200.60.1 0 200 50 i
* 10.100.83.1 0 100 50 i
*> 10.50.250.1 0 0 50 i
*> 172.18.0.0 0.0.0.0 0 32768 i
* 172.29.2.0/24 10.200.60.1 0 200 50 i
* 10.100.83.1 0 100 50 i
*> 10.50.250.1 0 0 50 i
* 192.168.50.0 10.200.60.1 0 200 50 i
* 10.100.83.1 0 100 50 i
*> 10.50.250.1 0 0 50 i
*> 192.168.75.0 0.0.0.0 0 32768 i
Lillehammer#sh ip eigr to
IP-EIGRP Topology Table for AS(100)/ID(192.168.75.1)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 10.20.0.0/16, 0 successors, FD is Inaccessible
via 192.168.1.1 (40640000/128256), Serial0/1
P 192.168.75.0/24, 1 successors, FD is 128256
via Connected, Loopback2
P 192.168.50.0/24, 0 successors, FD is Inaccessible
via 192.168.1.1 (40640000/128256), Serial0/1
P 192.168.1.0/24, 1 successors, FD is 40512000
via Connected, Serial0/1
P 172.29.2.0/24, 0 successors, FD is Inaccessible
via 192.168.1.1 (40640000/128256), Serial0/1
P 172.17.0.0/16, 1 successors, FD is 40640000
via 192.168.1.1 (40640000/128256), Serial0/1
P 172.18.0.0/16, 1 successors, FD is 128256
via Connected, Loopback1
Lillehammer#sh ip rout
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
C 192.168.75.0/24 is directly connected, Loopback2
D 172.17.0.0/16 [90/40640000] via 192.168.1.1, 00:16:51, Serial0/1
C 172.18.0.0/16 is directly connected, Loopback1
172.29.0.0/24 is subnetted, 1 subnets
B 172.29.2.0 [20/0] via 10.50.250.1, 00:11:54
10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks
B 10.20.0.0/16 [20/0] via 10.50.250.1, 00:11:54
C 10.75.100.1/32 is directly connected, Loopback0
S 10.100.83.1/32 is directly connected, FastEthernet0/0
S 10.50.250.1/32 is directly connected, FastEthernet0/0
S 10.200.60.1/32 is directly connected, FastEthernet0/0
C 192.168.0.0/24 is directly connected, FastEthernet0/0
B 192.168.50.0/24 [20/0] via 10.50.250.1, 00:07:10
C 192.168.1.0/24 is directly connected, Serial0/1
Lillehammer#
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