Después de que hemos configurado el intercambio de etiquetas de MPLS, sigue activar mBGP a fin de poder intercambiar información de ruteo entre diferentes sistemas autónomos, dándonos la funcionalidad de poder comunicar dichos sistemas con cierta privacidad y aislando el tráfico en diferentes instancias, comenzando así con el servicio de una red privada virtual o VPN.
Lo primero es activar BGP en los routers 1 y 5, establecer su vecindad y configurar el tipo de instancia que queremos utilizar, en este caso VPNv4:
R1
router bgp 99
bgp log-neighbor-changes
neighbor 5.5.5.5 remote-as 99
neighbor 5.5.5.5 update-source Loopback1
!
address-family vpnv4
neighbor 5.5.5.5 activate
neighbor 5.5.5.5 send-community extended
exit-address-family
R5
router bgp 99
bgp log-neighbor-changes
neighbor 1.1.1.1 remote-as 99
neighbor 1.1.1.1 update-source Loopback1
!
address-family vpnv4
neighbor 1.1.1.1 activate
neighbor 1.1.1.1 send-community extended
exit-address-family
R1#sh bgp neig
BGP neighbor is 5.5.5.5, remote AS 99, internal link
BGP version 4, remote router ID 5.5.5.5
BGP state = Established, up for 00:14:57
Last read 00:00:33, last write 00:00:17, hold time is 180, keepalive interval is 60 seconds
Neighbor sessions:
1 active, is not multisession capable (disabled)
Neighbor capabilities:
Route refresh: advertised and received(new)
Four-octets ASN Capability: advertised and received
Address family IPv4 Unicast: advertised and received
Address family VPNv4 Unicast: advertised and received
Enhanced Refresh Capability: advertised and received
Multisession Capability:
Stateful switchover support enabled: NO for session 1
Message statistics:
InQ depth is 0
OutQ depth is 0
Sent Rcvd
Opens: 1 1
Notifications: 0 0
Updates: 2 2
Keepalives: 18 18
Route Refresh: 0 0
Total: 21 21
Default minimum time between advertisement runs is 0 seconds
For address family: IPv4 Unicast
Session: 5.5.5.5
BGP table version 1, neighbor version 1/0
Output queue size : 0
Index 3, Advertise bit 0
3 update-group member
Slow-peer detection is disabled
Slow-peer split-update-group dynamic is disabled
Sent Rcvd
Prefix activity: ---- ----
Prefixes Current: 0 0
Prefixes Total: 0 0
Implicit Withdraw: 0 0
Explicit Withdraw: 0 0
Used as bestpath: n/a 0
Used as multipath: n/a 0
Outbound Inbound
Local Policy Denied Prefixes: -------- -------
Total: 0 0
Number of NLRIs in the update sent: max 0, min 0
Last detected as dynamic slow peer: never
Dynamic slow peer recovered: never
Refresh Epoch: 1
Last Sent Refresh Start-of-rib: never
Last Sent Refresh End-of-rib: never
Last Received Refresh Start-of-rib: never
Last Received Refresh End-of-rib: never
Sent Rcvd
Refresh activity: ---- ----
Refresh Start-of-RIB 0 0
Refresh End-of-RIB 0 0
For address family: VPNv4 Unicast
Session: 5.5.5.5
BGP table version 1, neighbor version 1/0
Output queue size : 0
Index 1, Advertise bit 0
1 update-group member
Slow-peer detection is disabled
Slow-peer split-update-group dynamic is disabled
Y con esto tenemos una sesión multiprotocolo de BGP capaz de intercambiar información de rutas entre distintas instancias de ruteo o VRFs a través de una red en común, como sería un proveedor de servicios o ISP.
En el siguiente post veremos como configurar las vrf y hacer la comunicación entre ellas.
Descarga aquí las configuraciones completas de este laboratorio.
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