Topologie
Config routerelor CPE
CPE 1!Loopback0 - LAN interface Loopback0 ip address 7.7.7.7 255.255.255.255 !Ethernet0/1 - WAN interface Ethernet0/1 ip address 192.168.78.7 255.255.255.0 !ruta implicita - next hop router-ul PE1 ip route 0.0.0.0 0.0.0.0 192.168.78.8 |
CPE 2!Loopback0 - LAN interface Loopback0 ip address 1.1.1.1 255.255.255.255 !Ethernet0/1 - WAN interface Ethernet0/1 ip address 192.168.211.1 255.255.255.0 !ruta implicita - next hop router-ul PE2 ip route 0.0.0.0 0.0.0.0 192.168.211.21 |
Config routerelor P
P1interface Loopback0 ip address 23.23.23.23 255.255.255.255 !Ethernet0/0.423 - leg cu ASBR 1 interface Ethernet0/0.423 encapsulation dot1Q 423 ip address 10.4.23.23 255.255.255.0 mpls ip !Ethernet0/0.823 - leg cu PE 1 interface Ethernet0/0.823 encapsulation dot1Q 823 ip address 10.8.23.23 255.255.255.0 mpls ip !Ethernet0/0.236 - leg cu RR 1 interface Ethernet0/0.236 encapsulation dot1Q 236 ip address 10.23.6.23 255.255.255.0 mpls ip router ospf 1 network 10.4.23.23 0.0.0.0 area 0 network 10.8.23.23 0.0.0.0 area 0 network 23.23.23.23 0.0.0.0 area 0 network 10.23.6.23 0.0.0.0 area 0 |
P2interface Loopback0 ip address 22.22.22.22 255.255.255.255 !Ethernet0/0.322 - leg cu ASBR 2 interface Ethernet0/0.322 encapsulation dot1Q 322 ip address 10.3.22.22 255.255.255.0 mpls ip !Ethernet0/0.212 - leg cu PE 2 interface Ethernet0/0.212 encapsulation dot1Q 212 ip address 10.21.22.22 255.255.255.0 mpls ip !Ethernet0/0.222 - leg cu RR 2 interface Ethernet0/0.222 encapsulation dot1Q 222 ip address 10.0.222.22 255.255.255.0 mpls ip router ospf 1 network 10.3.22.22 0.0.0.0 area 0 network 10.21.22.22 0.0.0.0 area 0 network 22.22.22.22 0.0.0.0 area 0 network 10.0.222.22 0.0.0.0 area 0 |
Config routerelor ASBR
Aici am folosit filtrari pentru a anunta numai interfetele de mgmt ale routerelor PE si RR. Am folosit acelasi prefix-list, dar se mai poate rafina astfel incat sa aibe un numar mai mic de linii. Comanda 'neighbor send-label' este folosita pentru ca pe langa prefixe, BGP sa anunte si etictehele MPLS asociate.Routerele ASBR nu au nevoie nici macar de sesiune iBGP cu RR-ul AS-ului din care face parte, el fac doar label-swapping ca si routerele P.
ASBR 1interface Loopback0 ip address 4.4.4.4 255.255.255.255 interface Ethernet0/0 no shutdown !Ethernet0/0.43 - leg cu ASBR2 interface Ethernet0/0.43 encapsulation dot1Q 43 ip address 10.0.43.4 255.255.255.0 mpls bgp forwarding !Ethernet0/0.423 - leg cu P1 interface Ethernet0/0.423 encapsulation dot1Q 423 ip address 10.4.23.4 255.255.255.0 mpls ip router ospf 1 redistribute bgp 100 subnets route-map bgp-ospf network 4.4.4.4 0.0.0.0 area 0 network 10.4.23.4 0.0.0.0 area 0 router bgp 100 !sesiune eBGP cu ASBR1 neighbor 10.0.43.3 remote-as 200 address-family ipv4 redistribute ospf 1 neighbor 10.0.43.3 activate neighbor 10.0.43.3 send-label exit-address-family ip prefix-list Loopback seq 5 permit 2.2.2.2/32 ip prefix-list Loopback seq 10 permit 3.3.3.3/32 ip prefix-list Loopback seq 15 permit 4.4.4.4/32 ip prefix-list Loopback seq 20 permit 6.6.6.6/32 ip prefix-list Loopback seq 25 permit 8.8.8.8/32 ip prefix-list Loopback seq 30 permit 22.22.22.22/32 ip prefix-list Loopback seq 35 permit 21.21.21.21/32 route-map bgp-ospf permit 10 match ip address prefix-list Loopback |
ASBR 2interface Loopback0 ip address 3.3.3.3 255.255.255.255 interface Ethernet0/0 no shutdown !Ethernet0/0.43 - leg cu ASBR1 interface Ethernet0/0.43 encapsulation dot1Q 43 ip address 10.0.43.3 255.255.255.0 mpls bgp forwarding !Ethernet0/0.322 - leg cu P2 interface Ethernet0/0.322 encapsulation dot1Q 322 ip address 10.3.22.3 255.255.255.0 mpls ip router ospf 1 redistribute bgp 200 subnets route-map bgp-ospf network 3.3.3.3 0.0.0.0 area 0 network 10.3.22.3 0.0.0.0 area 0 router bgp 200 ! sesiune eBGP cu ASBR2 neighbor 10.0.43.4 remote-as 100 address-family ipv4 redistribute ospf 1 neighbor 10.0.43.4 activate neighbor 10.0.43.4 send-label exit-address-family ip prefix-list Loopback seq 5 permit 2.2.2.2/32 ip prefix-list Loopback seq 10 permit 3.3.3.3/32 ip prefix-list Loopback seq 15 permit 4.4.4.4/32 ip prefix-list Loopback seq 20 permit 6.6.6.6/32 ip prefix-list Loopback seq 25 permit 8.8.8.8/32 ip prefix-list Loopback seq 30 permit 22.22.22.22/32 ip prefix-list Loopback seq 35 permit 21.21.21.21/32 route-map bgp-ospf permit 10 match ip address prefix-list Loopback |
Config routerelor RR
Aici, pe langa sesiunea eBGP VPNv4 multihop, este importanta si optiunea neighbor next-hop-unchanged, altfel prefixele din celalalt AS au next-hop RR-ul din celalalt AS si mesajele il vor tranzita in mod inutil.RR 1interface Loopback0 ip address 6.6.6.6 255.255.255.255 !Ethernet0/0 - leg cu P1 interface Ethernet0/0 ip address 10.23.6.6 255.255.255.0 mpls ip router ospf 1 network 6.6.6.6 0.0.0.0 area 0 network 10.23.6.6 0.0.0.0 area 0 router bgp 100 no bgp default ipv4-unicast !sesiune eBGP multihop cu RR2 neighbor 2.2.2.2 remote-as 200 neighbor 2.2.2.2 ebgp-multihop 255 neighbor 2.2.2.2 update-source Loopback0 !sesiune iBGP cu PE1 neighbor 8.8.8.8 remote-as 100 neighbor 8.8.8.8 update-source Loopback0 address-family vpnv4 neighbor 2.2.2.2 activate neighbor 2.2.2.2 send-community both neighbor 2.2.2.2 next-hop-unchanged neighbor 8.8.8.8 activate neighbor 8.8.8.8 send-community both neighbor 8.8.8.8 route-reflector-client exit-address-family |
RR 2interface Loopback0 ip address 2.2.2.2 255.255.255.255 !Ethernet0/1 - leg cu P2 interface Ethernet0/1 ip address 10.0.222.2 255.255.255.0 mpls ip router ospf 1 network 2.2.2.2 0.0.0.0 area 0 network 10.0.222.2 0.0.0.0 area 0 router bgp 200 no bgp default ipv4-unicast !sesiune eBGP multihop cu RR1 neighbor 6.6.6.6 remote-as 100 neighbor 6.6.6.6 ebgp-multihop 255 neighbor 6.6.6.6 update-source Loopback0 !sesiune iBGP cu PE2 neighbor 21.21.21.21 remote-as 200 neighbor 21.21.21.21 update-source Loopback0 address-family vpnv4 neighbor 6.6.6.6 activate neighbor 6.6.6.6 send-community both neighbor 6.6.6.6 next-hop-unchanged neighbor 21.21.21.21 activate neighbor 21.21.21.21 send-community both neighbor 21.21.21.21 route-reflector-client exit-address-family |
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