Scenario-2 (HSRP)

Core1#conf t

Core1(config)#int f0/0

Core1(config-if)#no switchport

Core1(config-if)# ip address 10.1.12.1 255.255.255.0

Core1(config-if)#duplex full

Core1(config-if)#speed 100

Core1(config-if)#no shut

Core1(config-if)#end

Core1#conf t

Core1(config)#int f0/1

Core1(config-if)#no switchport

Core1(config-if)# ip address 10.1.111.1 255.255.255.0

Core1(config-if)#duplex full

Core1(config-if)#speed 100

Core1(config-if)#no shut

Core1(config-if)#end

Core1#conf t

Core1(config)#int f0/2

Core1(config-if)#no switchport

Core1(config-if)# ip address 10.1.112.1 255.255.255.0

Core1(config-if)#duplex full

Core1(config-if)#speed 100

Core1(config-if)#no shut

Core1(config-if)#end

Core1#conf t

Core1(config)#int lo0

Core1(config-if)# ip address 1.1.1.1 255.255.255.255

Core1(config-if)#no shut

Core1(config-if)#end

Core2#conf t

Core2(config)#int f0/0

Core2(config)#no switchport

Core2(config)#ip address 10.1.12.2 255.255.255.0

Core2(config)#duplex full

Core2(config)#speed 100

Core2(config)#no sh

Core2#conf t

Core2(config)#int f0/1

Core2(config)#no switchport

Core2(config)#ip address 10.1.212.2 255.255.255.0

Core2(config)#duplex full

Core2(config)#speed 100

Core2(config)#no sh

Core2#conf t

Core2(config)#int f0/2

Core2(config)#no switchport

Core2(config)#ip address 10.1.211.2 255.255.255.0

Core2(config)#duplex full

Core2(config)#speed 100

Core2(config)#no sh

Core2#conf t

Core2(config)#int lo0

Core2(config-if)# ip address 2.2.2.2 255.255.255.255

Core2(config-if)#no sh

Core2(config-if)#end

Dist1#conf t

Dist1(config)#int f0/1

Dist1(config-if)#ip add 10.1.111.11 255.255.255.0

Dist1(config-if)#duplex full

Dist1(config-if)#speed 100

Dist1(config-if)#no sh

Dist1(config-if)#end

Dist1#conf t

Dist1(config)#int f0/2

Dist1(config-if)#ip add 10.1.211.11 255.255.255.0

Dist1(config-if)#duplex full

Dist1(config-if)#speed 100

Dist1(config-if)#no sh

Dist1(config-if)#end

Dist1#conf t

Dist1(config)#int range f0/0 , f0/4

Dist1(config-if-range)#switchport mode trunk

Dist1(config-if-range)#switchport trunk encapsulation dot1q

Dist1(config)#int range f0/0 , f0/4

Dist1(config-if-range)#channel-group 1 mode on

Dist1(config-if-range)#end

Dist1#conf t

Dist1(config)#int range f0/3 , f0/5

Dist1(config-if-range)#switchport mode trunk

Dist1(config-if-range)#switchport trunk encapsulation dot1q

Dist1(config)#int range f0/3 , f0/5

Dist1(config-if-range)#channel-group 2 mode on

Dist1(config-if-range)#end

Dist1#sh int trunk

Port      Mode         Encapsulation  Status        Native vlan

Po1       on           802.1q         trunking      1

Po2       on           802.1q         trunking      1

Port      Vlans allowed on trunk

Po1       1-1005

Po2       1-1005

Port      Vlans allowed and active in management domain

Po1       1,10,20

Po2       1,10,20

Port      Vlans in spanning tree forwarding state and not pruned

Po1       1,10,20

Po2       1,10,20

Dist2(config)#int f0/1

Dist2(comfig-if)#no sw

Dist2(comfig-if)# ip address 10.1.212.12 255.255.255.0

Dist2(comfig-if)#speed 100

Dist2(config)#int f0/2

Dist2(comfig-if)#no sw

Dist2(comfig-if)# ip address 10.1.112.12 255.255.255.0

Dist2(comfig-if)#speed 100

Dist2#conf t

Dist2(config)#int range f0/0 , f0/4

Dist2(config-if-range)#switchport mode trunk

Dist2(config-if-range)#switchport trunk encapsulation dot1q

Dist2(config)#int range f0/0 , f0/4

Dist2(config-if-range)#channel-group 1 mode on

Dist2(config-if-range)#end

Dist2#conf t

Dist2(config)#int range f0/6 , f0/7

Dist2(config-if-range)#switchport mode trunk

Dist2(config-if-range)#switchport trunk encapsulation dot1q

Dist2(config)#int range f0/6 , f0/7

Dist2(config-if-range)#channel-group 3 mode on

Dist2(config-if-range)#end

Dist2#sh int trunk

Port      Mode         Encapsulation  Status        Native vlan

Po1       on           802.1q         trunking      1

Po3       on           802.1q         trunking      1

Port      Vlans allowed on trunk

Po1       1-1005

Po3       1-1005

Port      Vlans allowed and active in management domain

Po1       1,10,20

Po3       1,10,20

Port      Vlans in spanning tree forwarding state and not pruned

Po1       1,10,20

Po3       1,10,20

Core1#conf t

Core1(config)#router ospf 1

Core1(config-router)#net 10.1.12.0 0.0.0.255 a 0 (ospf 1 area 0 =backbone)

Core1(config-router)#net 10.1.112.0 0.0.0.255 a 0

Core1(config-router)#net 10.1.111.0 0.0.0.255 a 0

Core1(config-router)#net 1.1.1.1 0.0.0.0 a 0

Core1(config-router)#end

Core2#conf t

Core2(config)#router ospf 1

Core2(config-router)#net 10.1.212.0 0.0.0.255 a 0

Core2(config-router)#net 10.1.211.0 0.0.0.255 a 0

Core2(config-router)#net 10.1.112.0 0.0.0.255 a 0

Core2(config-router)#net 10.1.12.0 0.0.0.255 a 0

Core2(config-router)#net 2.2.2.2 0.0.0.0 a 0

Core2(config-router)#end

Dist1#conf t

Dist1(config)#router ospf 1

Dist1(config-router)#network 10.1.111.0 0.0.0.255 a 0

Dist1(config-router)#network 10.1.211.0 0.0.0.255 a 0

Dist1(config-router)#network 11.11.11.11 0.0.0.0 a 0

Dist1(config-router)#end

Dist2(config)#router ospf 1

Dist2(config-router)#network 10.1.212.0 0.0.0.255 area 0

Dist2(config-router)#network 10.1.211.0 0.0.0.255 area 0

Dist2(config-router)#network 12.12.12.12 0.0.0.0 area 0

Dist2(config-router)#end

Dist2#vlan database

Dist2(vlan)#vlan 10 name HR

VLAN 10 added:

    Name: HR

Dist2(vlan)#exit

APPLY completed.

Exiting....

Dist2#vlan database

Dist2(vlan)#vlan 20 name IT

VLAN 20 added:

    Name: IT

Dist2(vlan)#exit

APPLY completed.

Exiting....

Dist2#sh vlan-sw

VLAN Name                             Status    Ports

---- -------------------------------- --------- -------------------------------

1    default                          active    Fa0/3, Fa0/5, Fa0/8, Fa0/9

                                                Fa0/10, Fa0/11, Fa0/12, Fa0/13

                                                Fa0/14, Fa0/15

10   HR                               active   

20   IT                               active   

1002 fddi-default                     active   

1003 token-ring-default               active   

1004 fddinet-default                  active   

1005 trnet-default                    active   

VLAN Type  SAID       MTU   Parent RingNo BridgeNo Stp  BrdgMode Trans1 Trans2

---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------

1    enet  100001     1500  -      -      -        -    -        1002   1003

10   enet  100010     1500  -      -      -        -    -        0      0  

20   enet  100020     1500  -      -      -        -    -        0      0  

1002 fddi  101002     1500  -      -      -        -    -        1      1003

1003 tr    101003     1500  1005   0      -        -    srb      1      1002

1004 fdnet 101004     1500  -      -      1        ibm  -        0      0  

1005 trnet 101005     1500  -      -      1        ibm  -        0      0 

Dist2#sh vtp status

VTP Version                     : 2

Configuration Revision          : 0

Maximum VLANs supported locally : 256

Number of existing VLANs        : 5

VTP Operating Mode              : Server

VTP Domain Name                 :

VTP Pruning Mode                : Disabled

VTP V2 Mode                     : Disabled

VTP Traps Generation            : Disabled

MD5 digest                      : 0xBF 0x86 0x94 0x45 0xFC 0xDF 0xB5 0x70

Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00

Local updater ID is 10.1.212.12 on interface Fa0/1 (first interface found)

Dist2#vlan database

Dist2(vlan)#vtp domain RHC

Changing VTP domain name from NULL to RHC

Dist2(vlan)#exit

APPLY completed.

Exiting....

Dist2#sh vtp status

VTP Version                     : 2

Configuration Revision          : 0

Maximum VLANs supported locally : 256

Number of existing VLANs        : 5

VTP Operating Mode              : Server

VTP Domain Name                 : RHC

VTP Pruning Mode                : Disabled

VTP V2 Mode                     : Disabled

VTP Traps Generation            : Disabled

MD5 digest                      : 0x35 0xB4 0x21 0xC3 0x58 0x37 0x58 0x17

Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00

Local updater ID is 10.1.212.12 on interface Fa0/1 (first interface found)

Acc1#vlan database

Acc1(vlan)#vtp client

Setting device to VTP CLIENT mode.

Acc1(vlan)#exit

In CLIENT state, no apply attempted.

Exiting....

Acc1#sh vtp status

VTP Version                     : 2

Configuration Revision          : 0

Maximum VLANs supported locally : 256

Number of existing VLANs        : 5

VTP Operating Mode              : Client

VTP Domain Name                 : RHC

VTP Pruning Mode                : Disabled

VTP V2 Mode                     : Disabled

VTP Traps Generation            : Disabled

MD5 digest                      : 0x35 0xB4 0x21 0xC3 0x58 0x37 0x58 0x17

Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00

Dist1#vlan database

Dist1 (vlan)#vtp client

Setting device to VTP CLIENT mode.

Dist1 (vlan)#exit

In CLIENT state, no apply attempted.

Exiting....

Acc1#conf t

Acc1(config)#int f0/0

Acc1(config-if)#switchport mode access

Acc1(config-if)#switchport access vlan 10

Acc1#conf t

Acc1(config)#int f0/1

Acc1(config-if)#switchport mode access

Acc1(config-if)#switchport access vlan 20

Acc1(config)#end

PC-A(config)#int f0/0

PC-A(config-if)#ip add 192.168.10.100 255.255.255.0

PC-A(config-if)#duplex full

PC-A(config-if)#speed 100

PC-A(config-if)#no sh

PC-B(config)#int f0/0

PC-B(config-if)#ip add 192.168.20.100 255.255.255.0

PC-B(config-if)#duplex full

PC-B(config-if)#speed 100

PC-B(config-if)#end

PC-A#conf t 

 PC-A(config)#router ospf 1

PC-A(comfig-router)#network 192.168.10.0 255.255.255.0 a 1 (ospf 1 area 1)

PC-A(comfig-router)#network 192.168.20.0 255.255.255.0 a 1

PC-A(config)#end

PC-B#conf t

PC-B# router ospf 1

PC-B(comfig-router)#net 192.168.10.0 255.255.255.0  a 1

PC-B(comfig-router)#net 192.168.20.0 255.255.255.0  a 1

PC-B(config)#end

Dist1#conf t

Dist1(config)#int vlan10

Dist1(config-if)#ip add 192.168.10.2 255.255.255.0

Dist1(config-if)#standby 1 ip 192.168.10.1

Dist1(config-if)#standby 1 priority 100

Dist1(config-if)#standby 1 preempt

Dist1(config-if)#end

Dist1#conf t

Dist1(config)#int vlan20

Dist1(config-if)#ip add 192.168.20.2 255.255.255.0

Dist1(config-if)#standby 2 ip 192.168.20.1

Dist1(config-if)#standby 2 priority 100

Dist1(config-if)#standby 2 preempt

Dist1(config-if)#end

Dist2#conf t

Dist2(config)#int vlan 10

Dist2(config-if)#ip add 192.168.10.3 255.255.255.0

Dist2(config-if)#standby 1 ip 192.168.10.1

Dist2(config-if)#standby 1 priority 101

Dist2(config-if)#standby 1 preempt

Dist2(config-if)#end

Dist2(config)#int vlan 20

Dist2(config-if)#ip add 192.168.20.3 255.255.255.0

Dist2(config-if)#standby 2 ip 192.168.20.1

Dist2(config-if)#standby 2 priority 101

Dist2(config-if)#standby 2 preempt

Dist2(config-if)# end

Dist2#sh standby

Vlan10 - Group 1

  State is Active

    1 state change, last state change 00:14:33

  Virtual IP address is 192.168.10.1

  Active virtual MAC address is 0000.0c07.ac01

    Local virtual MAC address is 0000.0c07.ac01 (v1 default)

  Hello time 3 sec, hold time 10 sec

    Next hello sent in 2.944 secs

  Preemption enabled

  Active router is local

  Standby router is 192.168.10.2, priority 100 (expires in 1.844 sec)

  Priority 101 (configured 101)

  IP redundancy name is "hsrp-Vl10-1" (default)

Vlan20 - Group 2

  State is Active

    2 state changes, last state change 00:04:12

  Virtual IP address is 192.168.20.1

  Active virtual MAC address is 0000.0c07.ac02

    Local virtual MAC address is 0000.0c07.ac02 (v1 default)

  Hello time 3 sec, hold time 10 sec

    Next hello sent in 2.944 secs

  Preemption enabled

  Active router is local

  Standby router is 192.168.20.2, priority 100 (expires in 8.736 sec)

  Priority 101 (configured 101)

  IP redundancy name is "hsrp-Vl20-2" (default)

Dist1#sh standby

Vlan10 - Group 1

  State is Standby

    4 state changes, last state change 00:14:09

  Virtual IP address is 192.168.10.1

  Active virtual MAC address is 0000.0c07.ac01

    Local virtual MAC address is 0000.0c07.ac01 (v1 default)

  Hello time 3 sec, hold time 10 sec

    Next hello sent in 2.624 secs

  Preemption enabled

  Active router is 192.168.10.3, priority 101 (expires in 8.744 sec)

  Standby router is local

  Priority 100 (default 100)

  IP redundancy name is "hsrp-Vl10-1" (default)

Vlan20 - Group 2

  State is Standby

    1 state change, last state change 00:02:04

  Virtual IP address is 192.168.20.1

  Active virtual MAC address is 0000.0c07.ac02

    Local virtual MAC address is 0000.0c07.ac02 (v1 default)

  Hello time 3 sec, hold time 10 sec

    Next hello sent in 2.616 secs

  Preemption enabled

  Active router is 192.168.20.3, priority 101 (expires in 8.756 sec)

  Standby router is local

  Priority 100 (default 100)

  IP redundancy name is "hsrp-Vl20-2" (default)

Dist1#conf t

Dist1(config)#router ospf 1

Dist1(config-router)# network 192.168.10.0 0.0.0.255 area 1

Dist1(config-router)#network 192.168.20.0 0.0.0.255 area 1

Dist1(config-router)#end

Dist2#conf t

Dist2(config)#router ospf 1

Dist2(config-router)# network 192.168.10.0 0.0.0.255 area 1

Dist2(config-router)#network 192.168.20.0 0.0.0.255 area 1

Dist2(config-router)#end

PC-A#ping 192.168.20.100                (PC-B)

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 192.168.20.100, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms

HOW TO: MIGRATE ACTIVE DIRECTORY FROM WINDOWS SERVER 2003 TO 2008

IBGP

 

R1(config)#int f0/0

R1(config-if)#ip add 10.1.12.1 255.255.255.0

R1(config-if)#no sh

R1(config)#int lo0

R1(config-if)#ip add 1.1.1.1 255.255.255.255

R1(config-if)#exit

R1(config)#router bgp 1

R1(config-router)#nei 10.1.12.2 remote-as 1

R1(config-router)#nei 10.1.23.3 remote-as 1

R1(config-router)#nei 10.1.34.4 remote-as 1

R1(config-router)#network 1.1.1.1 mask 255.255.255.255

R1(config-router)#end

R1#conf t

R1(config)#ip route 10.1.23.0 255.255.255.0 10.1.12.2

R1(config)#ip route 10.1.34.0 255.255.255.0 10.1.12.2

R1(config)#end

R2(config)#int f0/0

R2(config-if)#ip add 10.1.12.2 255.255.255.0

R2(config-if)#no sh

R2(config)#int f1/0

R2(config-if)#ip add 10.1.23.2 255.255.255.0

R2(config-if)#no sh

R2(config)#int lo0

R2(config-if)#ip add 2.2.2.2 255.255.255.255

R2(config-if)#exit

R2(config)#router bgp 1

R2(config-router)#nei 10.1.12.1 remote-as 1

R2(config-router)#nei 10.1.23.3 remote-as 1

R2(config-router)#net 2.2.2.2 mask 255.255.255.255

R2(config-router)#end

R2#conf t

R2(config)#ip route 10.1.34.0 255.255.255.0 10.1.23.3

R2(config)#end

R3(config)#int f0/0

R3(config-if)#ip add 10.1.23.3 255.255.255.0

R3(config-if)#no sh

R3(config)#int f1/0

R3(config-if)#ip add 10.1.34.3 255.255.255.0

R3(config-if)#no sh

R3(config)#int lo0

R3(config-if)#ip add 3.3.3.3 255.255.255.255

R3(config-if)#exit

R3(config)#router bgp 1

R3(config-router)#nei 10.1.23.2 remote-as 1

R3(config-router)#nei 10.1.34.4 remote-as 1

R3(config-router)#net 3.3.3.3 mask 255.255.255.255

R3(config-router)#end

R3(config)#ip route

R3(config)#ip route 10.1.12.0 255.255.255.0 10.1.23.2

R3(config)#end

                     

R4(config)#int f0/0

R4(config-if)#ip add 10.1.34.4 255.255.255.0

R4(config-if)#no sh

R4(config)#int lo0

R4(config-if)#ip add 4.4.4.4 255.255.255.255

R4(config-if)#exit           

R4(config)#router bgp 1

R4(config-router)#nei 10.1.34.3 remote-as 1

R4(config-router)#net 4.4.4.4 mask 255.255.255.255

R4(config-router)#end

R4#conf t

R4(config)#ip route 10.1.23.0 255.255.255.0 10.1.34.3

R4(config)#ip route 10.1.12.0 255.255.255.0 10.1.34.3

R4(config)#end

R1#sh ip bgp

BGP table version is 5, local router ID is 1.1.1.1

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

              r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop           Metric  LocPrf  Weight Path

*> 1.1.1.1/32       0.0.0.0                      0                    32768 i

*>i2.2.2.2/32       10.1.12.2                0    100                   0 i

*>i3.3.3.3/32       10.1.23.3                0    100                   0 i

*>i4.4.4.4/32       10.1.34.4                0    100                   0 i

R1#sh ip bgp summ

BGP router identifier 1.1.1.1, local AS number 1

BGP table version is 5, main routing table version 5

4 network entries using 468 bytes of memory

4 path entries using 208 bytes of memory

3/2 BGP path/bestpath attribute entries using 372 bytes of memory

0 BGP route-map cache entries using 0 bytes of memory

0 BGP filter-list cache entries using 0 bytes of memory

BGP using 1048 total bytes of memory

BGP activity 4/0 prefixes, 6/2 paths, scan interval 60 secs

Neighbor        V    AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd

10.1.12.2       4     1      39      39        5    0    0 00:32:36        1

10.1.23.3       4     1      18      18        5    0    0 00:13:14        1

10.1.34.4       4     1      16      16        5    0    0 00:11:30        1

R1#sh ip route

Codes: C - connected, S - static, 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

       i - IS-IS, su - IS-IS summary, 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

     1.0.0.0/32 is subnetted, 1 subnets

C       1.1.1.1 is directly connected, Loopback0

     2.0.0.0/32 is subnetted, 1 subnets

B       2.2.2.2 [200/0] via 10.1.12.2, 00:33:43

     3.0.0.0/32 is subnetted, 1 subnets

B       3.3.3.3 [200/0] via 10.1.23.3, 00:15:21

     4.0.0.0/32 is subnetted, 1 subnets

B       4.4.4.4 [200/0] via 10.1.34.4, 00:13:36

     10.0.0.0/24 is subnetted, 3 subnets

C       10.1.12.0 is directly connected, FastEthernet0/0

S       10.1.23.0 [1/0] via 10.1.12.2

S       10.1.34.0 [1/0] via 10.1.12.2

R1#sh tcp bri

TCB       Local Address           Foreign Address        (state)

64FBD584  10.1.12.1.40937         10.1.12.2.179          ESTAB

64FBCF34  10.1.12.1.179           10.1.34.4.29315        ESTAB

64FC1788  10.1.12.1.179           10.1.23.3.59782        ESTAB

R1#ping 10.1.34.4

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.1.34.4, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 56/64/68 ms

R1#ping 4.4.4.4 

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 4.4.4.4, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 56/64/68 ms

R2#sh ip bgp

BGP table version is 5, local router ID is 2.2.2.2

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

              r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path

*>i1.1.1.1/32       10.1.12.1                0         100             0 i

*> 2.2.2.2/32       0.0.0.0                     0                    32768 i

*>i3.3.3.3/32       10.1.23.3                0         100             0 i

*>i4.4.4.4/32       10.1.34.4                0         100             0 i

R3#sh ip bgp

BGP table version is 5, local router ID is 3.3.3.3

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

              r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric  LocPrf  Weight  Path

*>i1.1.1.1/32       10.1.12.1                0       100                0   i

*>i2.2.2.2/32       10.1.23.2                0       100                0   i

*> 3.3.3.3/32       0.0.0.0                     0                    32768    i

*>i4.4.4.4/32       10.1.34.4                0        100               0   i

R4#sh ip bgp

BGP table version is 5, local router ID is 4.4.4.4

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

              r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path

*>i1.1.1.1/32       10.1.12.1                0       100               0 i

*>i2.2.2.2/32       10.1.23.2                0       100               0 i

*>i3.3.3.3/32       10.1.34.3                0       100               0 i

*> 4.4.4.4/32       0.0.0.0                     0                    32768 i

EBGP

R1(config)#int f0/0

R1(config-if)#ip add 10.1.12.1 255.255.255.0

R1(config-if)#no sh

R1(config)#int lo0

R1(config-if)#ip add 1.1.1.1 255.255.255.255

R1(config-if)#exit

R1(config)#router bgp 1

R1(config-router)#neighbor 10.1.12.2 remote-as 2

R1(config-router)#neighbor 10.1.12.2 ebgp-multihop 3

R1(config-router)#neighbor 10.1.12.2 update-source loopback 0

R1(config-router)#network 1.1.1.1 mask 255.255.255.255

R1(config-router)#end

R2(config)#int f0/0

R2(config-if)#ip add 10.1.12.2 255.255.255.0

R2(config-if)#no sh

R2(config)#int f1/0

R2(config-if)#ip add 10.1.23.2 255.255.255.0

R2(config-if)#no sh

R2(config)#int lo0

R2(config-if)#ip add 2.2.2.2 255.255.255.255

R2(config-if)#exit

R2(config)#router bgp 2

R2(config-router)#nei 10.1.12.1 remote-as 1

R2(config-router)#nei 10.1.23.3 remote-as 3

R2(config-router)#net 2.2.2.2 mask 255.255.255.255

R2(config-router)#end

R3(config)#int f0/0

R3(config-if)#ip add 10.1.23.3 255.255.255.0

R3(config-if)#no sh

R3(config)#int f1/0

R3(config-if)#ip add 10.1.34.3 255.255.255.0

R3(config-if)#no sh

R3(config)#int lo0

R3(config-if)#ip add 3.3.3.3 255.255.255.255

R3(config-if)#exit

R3(config)#router bgp 3

R3(config-router)#nei 10.1.23.2 remote-as 2

R3(config-router)#nei 10.1.34.4 remote-as 4

R3(config-router)#net 3.3.3.3 mask 255.255.255.255

R3(config-router)#end

                  

R4(config)#int f0/0

R4(config-if)#ip add 10.1.34.4 255.255.255.0

R4(config-if)#no sh

R4(config)#int lo0

R4(config-if)#ip add 4.4.4.4 255.255.255.255

R4(config-if)#exit       

R4(config)#router bgp 4

R4(config-router)#nei 10.1.34.3 remote-as 3

R4(config-router)#net 4.4.4.4 mask 255.255.255.255

R4(config-router)#end

R2#sh ip bgp

BGP table version is 5, local router ID is 2.2.2.2

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

              r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path

*> 1.1.1.1/32       10.1.12.1                0                   0   1 i

*> 2.2.2.2/32       0.0.0.0                   0              2768   i

*> 3.3.3.3/32       10.1.23.3                0                   0   3 i

*> 4.4.4.4/32       10.1.23.3                                     0   3 4 i

R2#sh run | s bgp

router bgp 2

 no synchronization

 bgp log-neighbor-changes

 network 2.2.2.2 mask 255.255.255.255

 neighbor 10.1.12.1 remote-as 1

 neighbor 10.1.23.3 remote-as 3

 no auto-summary

R2#sh ip bgp summ

BGP router identifier 2.2.2.2, local AS number 2

BGP table version is 5, main routing table version 5

4 network entries using 468 bytes of memory

4 path entries using 208 bytes of memory

5/4 BGP path/bestpath attribute entries using 620 bytes of memory

3 BGP AS-PATH entries using 72 bytes of memory

0 BGP route-map cache entries using 0 bytes of memory

0 BGP filter-list cache entries using 0 bytes of memory

BGP using 1368 total bytes of memory

BGP activity 4/0 prefixes, 4/0 paths, scan interval 60 secs

Neighbor        V    AS  MsgRcvd  MsgSent   TblVer  InQ  OutQ  Up/Down   State/PfxRcd

10.1.12.1        4      1                17            19              5    0          0     00:13:23                  1

10.1.23.3        4      3                16            19              5    0          0     00:09:33                  2

R2#sh ip route

Codes: C - connected, S - static, 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

       i - IS-IS, su - IS-IS summary, 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

     1.0.0.0/32 is subnetted, 1 subnets

B       1.1.1.1 [20/0] via 10.1.12.1, 00:13:51

     2.0.0.0/32 is subnetted, 1 subnets

C       2.2.2.2 is directly connected, Loopback0

     3.0.0.0/32 is subnetted, 1 subnets

B       3.3.3.3 [20/0] via 10.1.23.3, 00:08:01

     4.0.0.0/32 is subnetted, 1 subnets

B       4.4.4.4 [20/0] via 10.1.23.3, 00:07:00

     10.0.0.0/24 is subnetted, 2 subnets

C       10.1.12.0 is directly connected, FastEthernet0/0

C       10.1.23.0 is directly connected, FastEthernet1/0

R2#sh tcp bri

TCB               Local Address           Foreign Address        (state)

64EDDC80  10.1.23.2.42087         10.1.23.3.179          ESTAB

64EDED04  10.1.12.2.179           10.1.12.1.45753        ESTAB

R1#sh ip bgp

BGP table version is 5, local router ID is 1.1.1.1

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

              r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf   Weight   Path

*> 1.1.1.1/32       0.0.0.0                     0                      32768    i

*> 2.2.2.2/32       10.1.12.2                0                                0    2 i

*> 3.3.3.3/32       10.1.12.2                                                   0    2 3 i

*> 4.4.4.4/32       10.1.12.2                                                   0    2 3 4 i

R3#sh ip bgp

BGP table version is 5, local router ID is 3.3.3.3

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

              r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf   Weight   Path

*> 1.1.1.1/32       10.1.23.2                                                0     2 1 i

*> 2.2.2.2/32       10.1.23.2                0                             0      2 i

*> 3.3.3.3/32       0.0.0.0                     0                   32768      i

*> 4.4.4.4/32       10.1.34.4                0                             0      4 i

R4#sh ip bgp

BGP table version is 5, local router ID is 4.4.4.4

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

              r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf  Weight   Path

*> 1.1.1.1/32       10.1.34.3                                                0     3 2 1 i

*> 2.2.2.2/32       10.1.34.3                                                0     3 2 i

*> 3.3.3.3/32       10.1.34.3                0                              0     3 i

*> 4.4.4.4/32       0.0.0.0                     0                   32768      i