cisco vpn/bgp+mpls inter-as option b

README.md

cisco vpn/bgp+mpls inter-as option b

• with next-hop-self
• with loopback
• with ldp
• without bgp labeled-unicast
• without route-reflector
• without multi-hop ebgp

表示バグの罠に注意。 https://quickview.cloudapps.cisco.com/quickview/bug/CSCta83434

r4#show ip cef vrf A 192.168.3.0/24
192.168.3.0/24
  recursive via 192.168.2.1 unusable: no label
r4#show ip cef vrf A 192.168.3.0/24 detail
192.168.3.0/24, epoch 0
  recursive via 100.0.0.2 label 18
    recursive via 192.168.2.1 unusable: no label
r4#ping vrf A 192.168.3.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.3.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 56/88/116 ms

r1.ios

hostname r1

version 12.4
ip cef

ip vrf A
  rd 65000:1
  route-target both 65000:100

interface lo 0
  ip address 100.0.0.1 255.255.255.255

interface f 0/0
  ip address 192.168.0.1 255.255.255.0
  no shutdown

interface e 1/0
  ip address 192.168.1.1 255.255.255.0
  mpls ip
  no shutdown

router bgp 65000
  neighbor 192.168.0.2 remote-as 65001
  neighbor 100.0.0.3 remote-as 65000
  neighbor 100.0.0.3 update-source lo0
  address-family vpnv4
    neighbor 192.168.0.2 activate
    neighbor 100.0.0.3 activate
    neighbor 100.0.0.3 next-hop-self

ip route 100.0.0.3 255.255.255.255 192.168.1.2

end

r2.ios

version 12.4
ip cef

hostname r2

ip vrf A
  rd 65001:1
  route-target both 65000:100

interface lo 0
  ip address 100.0.0.2 255.255.255.255

interface f 0/0
  ip address 192.168.0.2 255.255.255.0
  no shutdown

interface e 1/0
  ip address 192.168.2.1 255.255.255.0
  mpls ip
  no shutdown

router bgp 65001
  neighbor 192.168.0.1 remote-as 65000
  neighbor 100.0.0.4 remote-as 65001
  neighbor 100.0.0.4 update-source lo0
  address-family vpnv4
    neighbor 192.168.0.1 activate
    neighbor 100.0.0.4 activate
    neighbor 100.0.0.4 next-hop-self

ip route 100.0.0.4 255.255.255.255 192.168.2.2

end

r3.ios

version 12.4
ip cef

hostname r3

ip vrf A
  rd 65000:2
  route-target both 65000:100

interface lo 0
  ip address 100.0.0.3 255.255.255.255

interface e 1/0
  ip address 192.168.1.2 255.255.255.0
  mpls ip
  no shutdown

interface e 1/1
  ip vrf forwarding A
  ip address 192.168.3.1 255.255.255.0
  no shutdown

router bgp 65000
  neighbor 100.0.0.1 remote-as 65000
  neighbor 100.0.0.1 update-source lo0
  address-family vpnv4
    neighbor 100.0.0.1 activate
    neighbor 100.0.0.1 next-hop-self
  address-family ipv4 vrf A
    redistribute connected

ip route 100.0.0.1 255.255.255.255 192.168.1.1

end

r4.ios

version 12.4
ip cef

hostname r4

ip vrf A
  rd 65001:2
  route-target both 65000:100

interface lo 0
  ip address 100.0.0.4 255.255.255.255

interface e 1/0
  ip address 192.168.2.2 255.255.255.0
  mpls ip
  no shutdown

interface e 1/1
  ip vrf forwarding A
  ip address 192.168.4.1 255.255.255.0
  no shutdown

router bgp 65001
  neighbor 100.0.0.2 remote-as 65001
  neighbor 100.0.0.2 update-source lo0
  address-family vpnv4
    neighbor 100.0.0.2 activate
    neighbor 100.0.0.2 next-hop-self
  address-family ipv4 vrf A
    redistribute connected

ip route 100.0.0.2 255.255.255.255 192.168.2.1

end