BGP Basics
Assignment
Goal: Configure BGP between autonomous systems and ensure connectivity between the Moscow and St. Petersburg offices.
- Configure eBGP between the Moscow office and two providers — Kitorn and Lamas
- Configure eBGP between providers Kitorn and Lamas
- Configure eBGP between Lamas and Triada
- Configure eBGP between the St. Petersburg office and provider Triada
- Enable IP connectivity between the Moscow and St. Petersburg offices
- Document the plan and changes
A link between R14 and R15 was added — to simplify connecting them in area 0 and to provide redundancy for internet-bound traffic.
eBGP — Moscow ↔ Kitorn and Lamas
R14 (AS 1001) — config
enable
configure terminal
router bgp 1001
bgp router-id 14.14.14.14
bgp log-neighbor-changes
neighbor 10.10.10.26 remote-as 1001
neighbor 100.100.100.2 remote-as 101
end
copy running-config startup-config
R14 — show bgp summary
BGP router identifier 14.14.14.14, local AS number 1001
BGP table version is 84, main routing table version 84
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
10.10.10.26 4 1001 379 383 84 0 0 05:34:13 9
100.100.100.2 4 101 381 378 84 0 0 05:33:33 10
R15 (AS 1001) — config
enable
configure terminal
router bgp 1001
bgp router-id 15.15.15.15
bgp log-neighbor-changes
neighbor 10.10.10.25 remote-as 1001
neighbor 111.111.111.2 remote-as 301
end
copy running-config startup-config
R15 — show bgp summary
BGP router identifier 15.15.15.15, local AS number 1001
BGP table version is 50, main routing table version 50
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
10.10.10.25 4 1001 385 380 50 0 0 05:35:41 9
111.111.111.2 4 301 378 373 50 0 0 05:34:10 10
R21 — Lamas (AS 301) — config
enable
configure terminal
router bgp 301
bgp router-id 21.21.21.21
bgp log-neighbor-changes
network 110.110.110.0 mask 255.255.255.252
network 111.111.111.0 mask 255.255.255.252
network 111.111.111.4 mask 255.255.255.252
neighbor 110.110.110.1 remote-as 101
neighbor 111.111.111.1 remote-as 1001
neighbor 111.111.111.6 remote-as 520
end
copy running-config startup-config
R21 — show bgp summary
BGP router identifier 21.21.21.21, local AS number 301
BGP table version is 30, main routing table version 30
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
110.110.110.1 4 101 385 380 30 0 0 05:35:38 7
111.111.111.1 4 1001 375 379 30 0 0 05:35:38 1
111.111.111.6 4 520 361 364 30 0 0 05:20:03 6
R22 — Kitorn (AS 101) — config
enable
configure terminal
router bgp 101
bgp router-id 22.22.22.22
bgp log-neighbor-changes
network 100.100.100.0 mask 255.255.255.252
network 100.100.100.4 mask 255.255.255.252
neighbor 100.100.100.1 remote-as 1001
neighbor 100.100.100.6 remote-as 520
neighbor 110.110.110.2 remote-as 301
end
copy running-config startup-config
R22 — show bgp summary
BGP router identifier 22.22.22.22, local AS number 101
BGP table version is 41, main routing table version 41
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
100.100.100.1 4 1001 383 386 41 0 0 05:37:31 1
100.100.100.6 4 520 363 369 41 0 0 05:23:07 6
110.110.110.2 4 301 382 386 41 0 0 05:36:40 8
eBGP — Kitorn/Lamas ↔ Triada
R23 — Triada (AS 520) — config
enable
configure terminal
router bgp 520
bgp router-id 23.23.23.23
bgp log-neighbor-changes
neighbor 50.0.24.1 remote-as 520
neighbor 50.0.24.1 update-source Loopback0
neighbor 50.0.25.1 remote-as 520
neighbor 50.0.25.1 update-source Loopback0
neighbor 50.0.26.1 remote-as 520
neighbor 50.0.26.1 update-source Loopback0
neighbor 100.100.100.5 remote-as 101
end
copy running-config startup-config
R23 — show bgp summary
BGP router identifier 23.23.23.23, local AS number 520
BGP table version is 32, main routing table version 32
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
50.0.24.1 4 520 364 364 32 0 0 05:23:00 5
50.0.25.1 4 520 358 363 32 0 0 05:22:01 2
50.0.26.1 4 520 357 362 32 0 0 05:20:51 2
100.100.100.5 4 101 371 366 32 0 0 05:25:02 5
R24 — Triada (AS 520) — config
enable
configure terminal
router bgp 520
bgp router-id 24.24.24.24
bgp log-neighbor-changes
network 77.77.77.8 mask 255.255.255.252
neighbor 50.0.23.1 remote-as 520
neighbor 50.0.23.1 update-source Loopback0
neighbor 50.0.25.1 remote-as 520
neighbor 50.0.25.1 update-source Loopback0
neighbor 50.0.26.1 remote-as 520
neighbor 50.0.26.1 update-source Loopback0
neighbor 77.77.77.10 remote-as 2042
neighbor 111.111.111.5 remote-as 301
end
copy running-config startup-config
R24 — show bgp summary
BGP router identifier 24.24.24.24, local AS number 520
BGP table version is 22, main routing table version 22
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
50.0.23.1 4 520 367 367 22 0 0 05:25:27 4
50.0.25.1 4 520 359 365 22 0 0 05:24:28 2
50.0.26.1 4 520 361 362 22 0 0 05:23:18 2
77.77.77.10 4 2042 370 368 22 0 0 05:25:27 0
111.111.111.5 4 301 371 367 22 0 0 05:25:27 5
eBGP — St. Petersburg ↔ Triada
R26 — Triada (AS 520) — config
enable
configure terminal
router bgp 520
bgp router-id 26.26.26.26
bgp log-neighbor-changes
network 77.77.77.12 mask 255.255.255.252
network 111.110.35.12 mask 255.255.255.252
neighbor 50.0.23.1 remote-as 520
neighbor 50.0.23.1 update-source Loopback0
neighbor 50.0.24.1 remote-as 520
neighbor 50.0.24.1 update-source Loopback0
neighbor 50.0.25.1 remote-as 520
neighbor 50.0.25.1 update-source Loopback0
neighbor 77.77.77.14 remote-as 2042
end
copy running-config startup-config
R26 — show bgp summary
BGP router identifier 26.26.26.26, local AS number 520
BGP table version is 16, main routing table version 16
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
50.0.23.1 4 520 366 361 16 0 0 05:24:08 4
50.0.24.1 4 520 363 362 16 0 0 05:24:08 5
50.0.25.1 4 520 363 359 16 0 0 05:24:08 2
77.77.77.14 4 2042 370 363 16 0 0 05:24:08 0
R18 — St. Petersburg (AS 2042) — config
enable
configure terminal
router bgp 2042
bgp router-id 18.18.18.18
bgp log-neighbor-changes
neighbor 77.77.77.9 remote-as 520
neighbor 77.77.77.13 remote-as 520
end
copy running-config startup-config
R18 — show bgp summary
BGP router identifier 18.18.18.18, local AS number 2042
BGP table version is 1, main routing table version 1
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
77.77.77.9 4 520 10 2 1 0 0 00:00:24 10
77.77.77.13 4 520 6 2 1 0 0 00:00:24 5
Verify connectivity — Moscow ↔ St. Petersburg
R15 ping R18
R15#ping 77.77.77.10
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 77.77.77.10, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms
R15#ping 77.77.77.14
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 77.77.77.14, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms
R14 ping R18
R14#ping 77.77.77.10
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 77.77.77.10, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/2 ms
R14#ping 77.77.77.14
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 77.77.77.14, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/2 ms
Provider networks
| Triada | Lamas | Kitorn |
|---|---|---|
| 77.77.77.8/30 | 111.111.111.0/30 | 100.100.100.0/30 |
| 77.77.77.12/30 | 110.110.110.0/30 | 100.100.100.4/30 |
| 111.110.35.8/30 | 111.111.111.4/30 | |
| 111.110.35.12/30 | ||
| 210.110.35.0/30 |
Full router configs
R14 (AS 1001)
enable
configure terminal
hostname R14
ipv6 unicast-routing
no ip domain-lookup
!
interface Ethernet0/0
ip address 10.10.10.17 255.255.255.252
ipv6 enable
ipv6 address FE80:4::14 link-local
ipv6 address 2002:ACAD:DB8:4::14/64
ipv6 ospf 1 area 0
no shutdown
!
interface Ethernet0/1
ip address 10.10.10.21 255.255.255.252
ipv6 enable
ipv6 address FE80:5::14 link-local
ipv6 address 2002:ACAD:DB8:5::14/64
ipv6 ospf 1 area 0
no shutdown
!
interface Ethernet0/2
ip address 100.100.100.1 255.255.255.252
ipv6 enable
ipv6 address 2002:ACAD:DB8:6::14/64
no shutdown
!
interface Ethernet0/3
ip address 10.10.10.13 255.255.255.252
ipv6 enable
ipv6 address FE80:6::14 link-local
ipv6 address 2002:ACAD:DB8:7::14/64
ipv6 ospf 1 area 101
no shutdown
!
interface Ethernet1/0
ip address 10.10.10.25 255.255.255.252
ipv6 enable
ipv6 address FE80:A::14 link-local
ipv6 address 2002:ACAD:DB8:A::14/64
no shutdown
!
router ospf 1
router-id 14.14.14.14
area 101 stub no-summary
network 10.10.10.12 0.0.0.3 area 101
network 10.10.10.16 0.0.0.3 area 0
network 10.10.10.20 0.0.0.3 area 0
default-information originate
!
ipv6 router ospf 1
router-id 14.14.14.14
area 101 stub no-summary
!
router bgp 1001
bgp router-id 14.14.14.14
bgp log-neighbor-changes
neighbor 10.10.10.26 remote-as 1001
neighbor 100.100.100.2 remote-as 101
!
ip route 0.0.0.0 0.0.0.0 100.100.100.2
end
copy running-config startup-config
R15 (AS 1001)
enable
configure terminal
hostname R15
ipv6 unicast-routing
no ip domain-lookup
!
interface Ethernet0/0
ip address 10.10.10.5 255.255.255.252
ipv6 enable
ipv6 address FE80:1::15 link-local
ipv6 address 2002:ACAD:DB8:0::15/64
ipv6 ospf 1 area 0
no shutdown
!
interface Ethernet0/1
ip address 10.10.10.9 255.255.255.252
ipv6 enable
ipv6 address FE80:2::15 link-local
ipv6 address 2002:ACAD:DB8:1::15/64
ipv6 ospf 1 area 0
no shutdown
!
interface Ethernet0/2
ip address 111.111.111.1 255.255.255.252
ipv6 enable
ipv6 address 2002:ACAD:DB8:2::15/64
no shutdown
!
interface Ethernet0/3
ip address 10.10.10.1 255.255.255.252
ipv6 enable
ipv6 address FE80:3::15 link-local
ipv6 address 2002:ACAD:DB8:3::15/64
ipv6 ospf 1 area 102
no shutdown
!
interface Ethernet1/0
ip address 10.10.10.26 255.255.255.252
ipv6 enable
ipv6 address FE80:A::15 link-local
ipv6 address 2002:ACAD:DB8:A::15/64
no shutdown
!
router ospf 1
router-id 15.15.15.15
network 10.10.10.0 0.0.0.3 area 102
network 10.10.10.4 0.0.0.3 area 0
network 10.10.10.8 0.0.0.3 area 0
distribute-list prefix PL1 in
default-information originate
!
ipv6 router ospf 1
router-id 15.15.15.15
distribute-list prefix-list PL6 in
!
ip prefix-list PL1 seq 5 deny 10.10.10.12/30
ip prefix-list PL1 seq 10 permit 0.0.0.0/0 le 32
!
ipv6 prefix-list PL6 seq 5 deny 2002:ACAD:DB8:7::/64 le 128
ipv6 prefix-list PL6 seq 10 permit ::/0 le 128
!
router bgp 1001
bgp router-id 15.15.15.15
bgp log-neighbor-changes
neighbor 10.10.10.25 remote-as 1001
neighbor 111.111.111.2 remote-as 301
!
ip route 0.0.0.0 0.0.0.0 111.111.111.2
end
copy running-config startup-config
R21 — Lamas (AS 301)
enable
configure terminal
hostname R21
!
interface Ethernet0/0
ip address 111.111.111.2 255.255.255.252
no shutdown
!
interface Ethernet0/1
ip address 110.110.110.2 255.255.255.252
no shutdown
!
interface Ethernet0/2
ip address 111.111.111.5 255.255.255.252
no shutdown
!
router bgp 301
bgp router-id 21.21.21.21
bgp log-neighbor-changes
network 110.110.110.0 mask 255.255.255.252
network 111.111.111.0 mask 255.255.255.252
network 111.111.111.4 mask 255.255.255.252
neighbor 110.110.110.1 remote-as 101
neighbor 111.111.111.1 remote-as 1001
neighbor 111.111.111.6 remote-as 520
end
copy running-config startup-config
R22 — Kitorn (AS 101)
enable
configure terminal
hostname R22
!
interface Ethernet0/0
ip address 100.100.100.2 255.255.255.252
no shutdown
!
interface Ethernet0/1
ip address 110.110.110.1 255.255.255.252
no shutdown
!
interface Ethernet0/2
ip address 100.100.100.5 255.255.255.252
no shutdown
!
router bgp 101
bgp router-id 22.22.22.22
bgp log-neighbor-changes
network 100.100.100.0 mask 255.255.255.252
network 100.100.100.4 mask 255.255.255.252
neighbor 100.100.100.1 remote-as 1001
neighbor 100.100.100.6 remote-as 520
neighbor 110.110.110.2 remote-as 301
end
copy running-config startup-config
R23 — Triada (AS 520)
enable
configure terminal
hostname R23
!
interface Loopback0
ip address 50.0.23.1 255.255.255.255
!
interface Ethernet0/0
ip address 100.100.100.6 255.255.255.252
no shutdown
!
interface Ethernet0/1
ip address 10.10.30.5 255.255.255.252
no shutdown
!
interface Ethernet0/2
ip address 10.10.30.1 255.255.255.252
no shutdown
!
router bgp 520
bgp router-id 23.23.23.23
bgp log-neighbor-changes
neighbor 50.0.24.1 remote-as 520
neighbor 50.0.24.1 update-source Loopback0
neighbor 50.0.25.1 remote-as 520
neighbor 50.0.25.1 update-source Loopback0
neighbor 50.0.26.1 remote-as 520
neighbor 50.0.26.1 update-source Loopback0
neighbor 100.100.100.5 remote-as 101
end
copy running-config startup-config
R24 — Triada (AS 520)
enable
configure terminal
hostname R24
!
interface Loopback0
ip address 50.0.24.1 255.255.255.255
!
interface Ethernet0/0
ip address 111.111.111.6 255.255.255.252
no shutdown
!
interface Ethernet0/1
ip address 10.10.30.13 255.255.255.252
no shutdown
!
interface Ethernet0/2
ip address 10.10.30.2 255.255.255.252
no shutdown
!
interface Ethernet0/3
ip address 77.77.77.9 255.255.255.252
no shutdown
!
router bgp 520
bgp router-id 24.24.24.24
bgp log-neighbor-changes
network 77.77.77.8 mask 255.255.255.252
neighbor 50.0.23.1 remote-as 520
neighbor 50.0.23.1 update-source Loopback0
neighbor 50.0.25.1 remote-as 520
neighbor 50.0.25.1 update-source Loopback0
neighbor 50.0.26.1 remote-as 520
neighbor 50.0.26.1 update-source Loopback0
neighbor 77.77.77.10 remote-as 2042
neighbor 111.111.111.5 remote-as 301
end
copy running-config startup-config
R25 — Triada (AS 520)
enable
configure terminal
hostname R25
!
interface Loopback0
ip address 50.0.25.1 255.255.255.255
!
interface Ethernet0/0
ip address 10.10.30.6 255.255.255.252
no shutdown
!
interface Ethernet0/1
ip address 210.110.35.1 255.255.255.252
no shutdown
!
interface Ethernet0/2
ip address 10.10.30.9 255.255.255.252
no shutdown
!
interface Ethernet0/3
ip address 111.110.35.9 255.255.255.252
no shutdown
!
router bgp 520
bgp router-id 25.25.25.25
bgp log-neighbor-changes
network 111.110.35.8 mask 255.255.255.252
network 210.110.35.0 mask 255.255.255.252
neighbor 50.0.23.1 remote-as 520
neighbor 50.0.23.1 update-source Loopback0
neighbor 50.0.24.1 remote-as 520
neighbor 50.0.24.1 update-source Loopback0
neighbor 50.0.26.1 remote-as 520
neighbor 50.0.26.1 update-source Loopback0
end
copy running-config startup-config
R26 — Triada (AS 520)
enable
configure terminal
hostname R26
!
interface Loopback0
ip address 50.0.26.1 255.255.255.255
!
interface Ethernet0/0
ip address 10.10.30.14 255.255.255.252
no shutdown
!
interface Ethernet0/1
ip address 111.110.35.13 255.255.255.252
no shutdown
!
interface Ethernet0/2
ip address 10.10.30.10 255.255.255.252
no shutdown
!
interface Ethernet0/3
ip address 77.77.77.13 255.255.255.252
no shutdown
!
router bgp 520
bgp router-id 26.26.26.26
bgp log-neighbor-changes
network 77.77.77.12 mask 255.255.255.252
network 111.110.35.12 mask 255.255.255.252
neighbor 50.0.23.1 remote-as 520
neighbor 50.0.23.1 update-source Loopback0
neighbor 50.0.24.1 remote-as 520
neighbor 50.0.24.1 update-source Loopback0
neighbor 50.0.25.1 remote-as 520
neighbor 50.0.25.1 update-source Loopback0
neighbor 77.77.77.14 remote-as 2042
end
copy running-config startup-config
R18 — St. Petersburg (AS 2042)
enable
configure terminal
hostname R18
!
interface Ethernet0/0
ip address 10.10.20.5 255.255.255.252
ipv6 enable
ipv6 address 2CAD:1995:B0DA:0::18/64
ipv6 address FE80:10::18 link-local
no shutdown
!
interface Ethernet0/1
ip address 10.10.20.1 255.255.255.252
ipv6 enable
ipv6 address 2CAD:1995:B0DA:1::18/64
ipv6 address FE80:11::18 link-local
no shutdown
!
interface Ethernet0/2
ip address 77.77.77.10 255.255.255.252
ipv6 enable
ipv6 address 2CAD:1995:B0DA:2::18/64
no shutdown
!
interface Ethernet0/3
ip address 77.77.77.14 255.255.255.252
ipv6 enable
ipv6 address 2CAD:1995:B0DA:3::18/64
no shutdown
!
router bgp 2042
bgp router-id 18.18.18.18
bgp log-neighbor-changes
neighbor 77.77.77.9 remote-as 520
neighbor 77.77.77.13 remote-as 520
end
copy running-config startup-config
Network Engineer Course | Lab 11