Tim's Technology Journey Wiki

This lab has the following parameters:

• iBGP between the three routers.
• The loopback addresses are used as the peering between the iBGP neighbors.

r1

en
conf t
!
hostname r1
interface Loopback0
 ip address 1.1.1.1 255.0.0.0
!
interface GigabitEthernet0/0
 ip address 12.1.1.1 255.255.255.0
 no shut
!
interface GigabitEthernet0/1
 ip address 13.1.1.1 255.255.255.0
 no shut
!
line con 0
logg syn
exec-timeout 0 0
!
end
wr

r2

en
conf t
!
hostname r2
interface Loopback0
 ip address 2.2.2.2 255.0.0.0
!
interface GigabitEthernet0/0
 ip address 12.1.1.2 255.255.255.0
 no shut
!
line con 0
logg syn
exec-timeout 0 0
!
end
wr

r3

en
conf t
!
hostname r3
interface Loopback0
 ip address 3.3.3.3 255.0.0.0
!
interface GigabitEthernet0/1
 ip address 13.1.1.3 255.255.255.0
 no shut
!
line con 0
logg syn
exec-timeout 0 0
!
end
wr

r1

router bgp 100
 bgp router-id 1.1.1.1
 network 1.0.0.0
 neighbor 12.1.1.2 remote-as 100
 neighbor 13.1.1.3 remote-as 100

r2

router bgp 100
 bgp router-id 2.2.2.2
 network 2.0.0.0
 neighbor 12.1.1.1 remote-as 100

r3

router bgp 100
 bgp router-id 3.3.3.3
 network 3.0.0.0
 neighbor 13.1.1.1 remote-as 100

r1#show ip bgp summ
BGP router identifier 1.1.1.1, local AS number 100
BGP table version is 4, main routing table version 4
3 network entries using 432 bytes of memory
3 path entries using 252 bytes of memory
2/2 BGP path/bestpath attribute entries using 320 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 1004 total bytes of memory
BGP activity 3/0 prefixes, 3/0 paths, scan interval 60 secs

Neighbor        V           AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
12.1.1.2        4          100       6      10        4    0    0 00:01:14        1
13.1.1.3        4          100       6       6        4    0    0 00:01:27        1

r1#show ip bgp | b Network
     Network          Next Hop            Metric LocPrf Weight Path
 *>   1.0.0.0          0.0.0.0                  0         32768 i
 *>i  2.0.0.0          12.1.1.2                 0    100      0 i
 *>i  3.0.0.0          13.1.1.3                 0    100      0 i

Cisco
Cisco Books
CCIE Bridging the Gap
CCIE Bridging the Gap - Chapter 10