netquirks
Exploring the quirks of Network Engineering
6PE
Scenario
6PE is used to transport IPv6 packets over an IPv4 based MPLS core. This scenario shows the configuration of a PE (R1 in the below diagram). It has an IPv6 eBGP session to a CE and IPv6 iBGP sessions to route reflectors with label-sending turned on for the exchange of 6PE labels. IS-IS is used as the IGP. A standard IPv4 MPLS VRF setup is also configured to show how the two setups can work side by side.
IOS Config
hostname R1!ip vrf CUST_1 description Customer_1_VRF rd 500:1 vpn id 500:1 route-target export 500:1 route-target import 500:1!ipv6 unicast-routingipv6 cef!interface Loopback0 ip address 5.5.5.5 255.255.255.255!interface GigabitEthernet0/0 description Link to CE1 no ip address!interface GigabitEthernet0/0.4 encapsulation dot1Q 4 ip vrf forwarding CUST_1 ip address 172.16.1.13 255.255.255.252!interface GigabitEthernet0/0.6 encapsulation dot1Q 6 ipv6 address 2001:DB8:5012::1/64!interface GigabitEthernet0/1 description link to P1 ip address 10.10.45.5 255.255.255.0 ip router isis LAB mpls ip isis circuit-type level-2-only!router isis LAB net 49.0500.5555.5555.5555.00 is-type level-2-only passive-interface Loopback0!router bgp 500 no bgp default ipv4-unicast bgp log-neighbor-changes neighbor 2.2.2.2 remote-as 500 neighbor 2.2.2.2 update-source Loopback0 neighbor 3.3.3.3 remote-as 500 neighbor 3.3.3.3 update-source Loopback0 neighbor 2001:DB8:5012::2 remote-as 200 neighbor 2001:DB8:5012::2 description BGP to CE1 ! address-family ipv4 redistribute connected redistribute static neighbor 2.2.2.2 activate neighbor 2.2.2.2 next-hop-self neighbor 3.3.3.3 activate neighbor 3.3.3.3 next-hop-self no auto-summary no synchronization exit-address-family ! address-family vpnv4 neighbor 2.2.2.2 activate neighbor 2.2.2.2 send-community extended neighbor 2.2.2.2 next-hop-self neighbor 3.3.3.3 activate neighbor 3.3.3.3 send-community extended neighbor 3.3.3.3 next-hop-self exit-address-family ! address-family ipv6 redistribute connected neighbor 2.2.2.2 activate neighbor 2.2.2.2 send-community both neighbor 2.2.2.2 send-label neighbor 3.3.3.3 activate neighbor 3.3.3.3 send-community both neighbor 3.3.3.3 send-label neighbor 2001:DB8:5012::2 activate exit-address-family ! address-family ipv4 vrf CUST_1 redistribute connected redistribute static neighbor 172.16.1.14 remote-as 200 neighbor 172.16.1.14 description CE1 neighbor 172.16.1.14 activate neighbor 172.16.1.14 default-originate neighbor 172.16.1.14 as-override no synchronization exit-address-family!XR Config
hostname R1!vrf CUST_1 vpn id 500:1 address-family ipv4 unicast import route-target 500:1 ! export route-target 500:1 ! !!interface Loopback0 ipv4 address 5.5.5.5 255.255.255.255!!interface GigabitEthernet0/0/0/0 description link to CE1!interface GigabitEthernet0/0/0/0.4 vrf CUST_1 ipv4 address 172.16.1.13 255.255.255.252 encapsulation dot1q 4!interface GigabitEthernet0/0/0/0.6 ipv6 address 2001:db8:5012::1/64 encapsulation dot1q 6!interface GigabitEthernet0/0/0/1 description link to P1 ipv4 address 10.10.45.5 255.255.255.0!!route-policy ALLOW_ALL passend-policy!router isis LAB is-type level-2-only net 49.0500.5555.5555.5555.00 address-family ipv4 unicast ! interface Loopback0 passive address-family ipv4 unicast ! ! interface GigabitEthernet0/0/0/1 circuit-type level-2-only point-to-point address-family ipv4 unicast ! !!router bgp 500 address-family ipv4 unicast redistribute connected redistribute static ! address-family vpnv4 unicast ! address-family ipv6 unicast redistribute connected allocate-label all ! neighbor 2.2.2.2 remote-as 500 update-source Loopback0 address-family ipv4 unicast next-hop-self ! address-family vpnv4 unicast next-hop-self ! address-family ipv6 labeled-unicast next-hop-self ! ! neighbor 3.3.3.3 remote-as 500 update-source Loopback0 address-family ipv4 unicast next-hop-self ! address-family vpnv4 unicast next-hop-self ! address-family ipv6 labeled-unicast next-hop-self ! ! neighbor 2001:db8:5012::2 remote-as 200 description IPv6 BGP to CE1 address-family ipv6 unicast route-policy ALLOW_ALL in route-policy ALLOW_ALL out as-override ! ! vrf CUST_1 rd 500:1 address-family ipv4 unicast redistribute connected redistribute static ! neighbor 172.16.1.14 remote-as 200 description IPv4 BGP to CE1 address-family ipv4 unicast route-policy ALLOW_ALL in route-policy ALLOW_ALL out as-override ! ! !!mpls ldp address-family ipv4 ! interface GigabitEthernet0/0/0/1 address-family ipv4 ! !!
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