====IOS-XR Lab 5: iBGP with Three Routers part 1====

This lab will configure a third router to form iBGP with three routers. This lab will fail, but will be fixed in Lab 6.
  - Configure a third BGP router, connected to R2's G0/0/0/1 interface, with the following parameters:
    - Hostname=R3
    - Lo0=3.3.3.3/32
    - G0/0/0/1=10.0.1.3/24
    - BGP ASN=65000
    - BGP router-id=3.3.3.3
    - HSRP not required at this time
    - ++Answer|<code>hostname R3
interface Loopback0
 ipv4 address 3.3.3.3 255.255.255.255
!
interface GigabitEthernet0/0/0/1
 description R2; G 0/0/0/1; 10.0.0.1.2/24
 ipv4 address 10.0.1.3 255.255.255.0
!
router bgp 65000
 bgp router-id 3.3.3.3
 address-family ipv4 unicast
  network 3.3.3.3/32
  network 10.0.1.0/24
 !
 neighbor 10.0.0.2
  remote-as 65000
  address-family ipv4 unicast
  !
 !
 neighbor 10.0.1.2
  remote-as 65000
  address-family ipv4 unicast</code> ++
  - On R2:
    - G0/0/0/1=10.0.1.2/24
    - BGP ASN=65000
      - ++Answer|<code>interface GigabitEthernet0/0/0/1
 description R3; G 0/0/0/1; 10.0.1.3/24
 ipv4 address 10.0.1.2 255.255.255.0
!
router bgp 65000
 address-family ipv4 unicast
  network 10.0.1.0/24
 neighbor 10.0.1.3
  remote-as 65000
  address-family ipv4 unicast</code> ++
  - Verify
    - <code>RP/0/0/CPU0:R3#show bgp summ
BGP router identifier 3.3.3.3, local AS number 65000
Neighbor        Spk    AS MsgRcvd MsgSent   TblVer  InQ OutQ  Up/Down  St/PfxRcd
10.0.0.2          0 65000       0       0        0    0    0 00:00:00 Active
10.0.1.2          0 65000       6       6        6    0    0 00:02:50          3</code>
    - Notice that the 10.0.0.2 neighbor is stuck in Active. This is because iBGP requires a full-mesh topology to prevent routing loops.

[[:cisco:labs:ios_xr:lab6|IOS-XR Lab 6: iBGP with Three Routers part 2]]\\ 
[[:cisco:labs:ios_xr|IOS-XR Lab Index]]