Configuring VRF-lite

Information About VRF-lite

VRF-lite is a feature that enables a service provider to support two or more VPNs, where IP addresses can be overlapped among the VPNs. VRF-lite uses input interfaces to distinguish routes for different VPNs and forms virtual packet-forwarding tables by associating one or more Layer 3 interfaces with each VRF. Interfaces in a VRF can be either physical, such as Ethernet ports, or logical, such as VLAN SVIs, but a Layer 3 interface cannot belong to more than one VRF at any time.


Note

VRF-lite interfaces must be Layer 3 interfaces.

VRF-lite includes these devices:

  • Customer edge (CE) devices provide customer access to the service provider network over a data link to one or more provider edge routers. The CE device advertises the site’s local routes to the provider edge router and learns the remote VPN routes from it. A Cisco Catalyst Switch can be a CE.

  • Provider edge (PE) routers exchange routing information with CE devices by using static routing or a routing protocol such as BGP, RIPv1, or RIPv2.

    The PE is only required to maintain VPN routes for those VPNs to which it is directly attached, eliminating the need for the PE to maintain all of the service provider VPN routes. Each PE router maintains a VRF for each of its directly connected sites. Multiple interfaces on a PE router can be associated with a single VRF if all of these sites participate in the same VPN. Each VPN is mapped to a specified VRF. After learning local VPN routes from CEs, a PE router exchanges VPN routing information with other PE routers by using internal BGP (iBPG).

  • Provider routers (or core routers) are any routers in the service provider network that do not attach to CE devices.

With VRF-lite, multiple customers can share one CE, and only one physical link is used between the CE and the PE. The shared CE maintains separate VRF tables for each customer and switches or routes packets for each customer based on its own routing table. VRF-lite extends limited PE functionality to a CE device, giving it the ability to maintain separate VRF tables to extend the privacy and security of a VPN to the branch office.

The following figure displays a configuration where each Cisco Catalyst switch acts as multiple virtual CEs. Because VRF-lite is a Layer 3 feature, each interface in a VRF must be a Layer 3 interface.

Figure 1. Cisco Catalyst Switches Acting as Multiple Virtual CEs



This figure illustrates the packet-forwarding process in a VRF-lite CE-enabled network.

  • When the CE receives a packet from a VPN, it looks up the routing table based on the input interface. When a route is found, the CE forwards the packet to the PE.

  • When the ingress PE receives a packet from the CE, it performs a VRF lookup. When a route is found, the router adds a corresponding MPLS label to the packet and sends it to the MPLS network.

  • When an egress PE receives a packet from the network, it strips the label and uses the label to identify the correct VPN routing table. The egress PE then performs the normal route lookup. When a route is found, it forwards the packet to the correct adjacency.

  • When a CE receives a packet from an egress PE, it uses the input interface to look up the correct VPN routing table. If a route is found, the CE forwards the packet within the VPN.

To configure VRF, create a VRF table and specify the Layer 3 interface associated with the VRF. You then configure the routing protocols in the VPN and between the CE and the PE. BGP is the preferred routing protocol used to distribute VPN routing information across the providers’ backbone. The VRF-lite network has three major components:

  • VPN route target communities—Lists all other members of a VPN community. You need to configure VPN route targets for each VPN community member.

  • Multiprotocol BGP peering of VPN community PE routers—Propagates VRF reachability information to all members of a VPN community. You need to configure BGP peering in all PE routers within a VPN community.

  • VPN forwarding—Transports all traffic between all VPN community members across a VPN service-provider network.

Guidelines for Configuring VRF-lite

IPv4 and IPv6

  • A switch with VRF-lite is shared by multiple customers, and all customers have their own routing tables.

  • Because customers use different VRF tables, you can reuse the same IP addresses. Overlapped IP addresses are allowed in different VPNs.

  • VRF-lite lets multiple customers share the same physical link between the PE and the CE. Trunk ports with multiple VLANs separate packets among customers. All customers have their own VLANs.

  • For the PE router, there is no difference between using VRF-lite or using multiple CEs. In , multiple virtual Layer 3 interfaces are connected to the VRF-lite device.

  • The Cisco Catalyst switch supports configuring VRF by using physical ports, VLAN SVIs, or a combination of both. You can connect SVIs through an access port or a trunk port.

  • A customer can use multiple VLANs as long because they do not overlap with those of other customers. A customer’s VLANs are mapped to a specific routing table ID that is used to identify the appropriate routing tables stored on the switch.

  • The Layer 3 TCAM resource is shared between all VRFs. To ensure that any one VRF has sufficient CAM space, use the maximum routes command.

  • A Cisco Catalyst switch using VRF can support one global network and multiple VRFs. The total number of routes supported is limited by the size of the TCAM.

  • A single VRF can be configured for both IPv4 and IPv6.

  • If an incoming packet's destination address is not found in the vrf table, the packet is dropped. Also, if insufficient TCAM space exists for a VRF route, hardware switching for that VRF is disabled and the corresponding data packets are sent to software for processing.

IPv4 Specific

  • You can use most routing protocols (BGP, OSPF, EIGRP, RIP and static routing) between the CE and the PE. However, we recommend using external BGP (EBGP) for these reasons:

    • BGP does not require multiple algorithms to communicate with multiple CEs.

    • BGP is designed for passing routing information between systems run by different administrations.

    • BGP makes simplifies passing attributes of the routes to the CE.

  • The Cisco Catalyst switch supports PIM-SM and PIM-SSM protocols.

  • The capability vrf-lite subcommand under router ospf should be used when configuring OSPF as the routing protocol between the PE and the CE.

IPv6 specific

  • VRF-aware OSPFv3, BGPv6, EIGRPv6, and IPv6 static routing are supported.

  • VRF-aware IPv6 route applications include: ping, telnet, ssh, tftp, ftp and traceroute. (This list does not include the Mgt interface, which is handled differently even though you can configure both IPv4 or IPv6 VRF under it.)

Topic 2.1

How to Configure VRF-lite

Configuring VRF-lite for IPv4

Configuring VRF-Aware Services

IP services can be configured on global interfaces and within the global routing instance. IP services are enhanced to run on multiple routing instances; they are VRF-aware. Any configured VRF in the system can be specified for a VRF-aware service.

VRF-aware services are implemented in platform-independent modules. VRF provides multiple routing instances in Cisco IOS. Each platform has its own limit on the number of VRFs it supports.

VRF-aware services have the following characteristics:

  • The user can ping a host in a user-specified VRF.

  • ARP entries are learned in separate VRFs. The user can display Address Resolution Protocol (ARP) entries for specific VRFs.

Configuring the User Interface for ARP

Procedure
     Command or ActionPurpose
    Step 1 show ip arp vrf vrf-name


    Example: 
    Switch# show ip arp vrf vrf-name
     

    Displays the ARP table (static and dynamic entries) in the specified VRF.

     
    Step 2arp vrf vrf-name ip-address mac-address ARPA


    Example: 
    Switch(config)# arp vrf vrf-name ip-address mac-address ARPA
     

    Creates a static ARP entry in the specified VRF.

     

    Configuring Per-VRF for TACACS+ Servers

    The per-VRF for TACACS+ servers feature enables you to configure per-virtual route forwarding (per-VRF) authentication, authorization, and accounting (AAA) on TACACS+ servers.

    You can create the VRF routing table (shown in Steps 3 and 4) and configure the interface (Steps 6, 7, and 8). The actual configuration of per-VRF on a TACACS+ server is done in Steps 10 through 13.

    Before You Begin

    Before configuring per-VRF on a TACACS+ server, you must have configured AAA and a server group.

    Procedure
       Command or ActionPurpose
      Step 1 enable


      Example: 
      Switch> enable
       

      Enables privileged EXEC mode. Enter your password if prompted.

       
      Step 2 configure terminal


      Example: 
      Switch# configure terminal
       

      Enters global configuration mode.

       
      Step 3 ip vrf vrf-name


      Example: 
      Switch(config)# ip vrf vrf-name
       

      Configures a VRF table and enters VRF configuration mode.

       
      Step 4 rd route-distinguisher


      Example: 
      Switch (config-vrf)# rd route-distinguisher
       

      Creates routing and forwarding tables for a VRF instance.

       
      Step 5 exit


      Example: 
      Switch (config-vrf)# exit
       

      Exits VRF configuration mode.

       
      Step 6 interface interface-name


      Example: 
      Switch (config)# interface interface-name
       

      Configures an interface and enters interface configuration mode.

       
      Step 7 vrf forwarding vrf-name


      Example: 
      Switch (config-if)# vrf forwarding vrf-name
       

      Configures a VRF for the interface.

       
      Step 8 ip address ip-address mask [secondary]


      Example: 
      Switch (config-if)# ip address ip-address mask [secondary]
       

      Sets a primary or secondary IP address for an interface.

       
      Step 9 exit


      Example: 
      Switch (config-vrf)# exit
       

      Exits interface configuration mode.

       
      Step 10 aaa group server tacacs+ group-name


      Example: 
      Switch (config)# aaa group server tacacs+ tacacs1
       

      Groups different TACACS+ server hosts into distinct lists and distinct methods and enters server-group configuration mode.

       
      Step 11 server-private {ip-address | name} [nat] [single-connection] [port port-number] [timeout seconds] [key [0 | 7] string]


      Example: 
      Switch (config-sg-tacacs+)# server-private 10.1.1.1 port 19 key cisco
       

      Configures the IP address of the private TACACS+ server for the group server.

       
      Step 12 vrf forwarding vrf-name


      Example: 
      Switch (config-sg-tacacs+)# vrf forwarding vrf-name
       

      Configures the VRF reference of a AAA TACACS+ server group.

       
      Step 13 ip tacacs source-interface subinterface-name


      Example: 
      Switch (config-sg-tacacs+)# ip tacacs source-interface subinterface-name
       

      Uses the IP address of a specified interface for all outgoing TACACS+ packets.

       
      Step 14 exit


      Example: 
      Switch (config-sg-tacacs)# exit
       

      Exits server-group configuration mode.

       
      The following example lists all the steps to configure per-VRF TACACS+:
      Switch> enable
Switch# configure terminal
Switch (config)# ip vrf cisco
Switch (config-vrf)# rd 100:1
Switch (config-vrf)# exit
Switch (config)# interface Loopback0
Switch (config-if)# vrf forwarding cisco
Switch (config-if)# ip address 10.0.0.2 255.0.0.0
Switch (config-if)# exit
Switch (config-sg-tacacs+)# vrf forwarding cisco
Switch (config-sg-tacacs+)# ip tacacs source-interface Loopback0
Switch (config-sg-tacacs)# exit

      Configuring Multicast VRFs

      Procedure
         Command or ActionPurpose
        Step 1 configure terminal


        Example: 
        Switch# configure terminal
         

        Enters global configuration mode.

         
        Step 2 ip routing


        Example: 
        Switch(config)# ip routing
         

        Enables IP routing.

         
        Step 3 ip vrf vrf-name


        Example: 
        Switch(config)# ip vrf vrf-name
         

        Configures a VRF table and enters VRF configuration mode.

         
        Step 4ip multicast-routing vrf vrf-name


        Example: 
        Switch(config-vrf)# ip multicast-routing vrf vrf-name
         

        (Optional) Enables global multicast routing for VRF table.

         
        Step 5 rd route-distinguisher


        Example: 
        Switch (config-vrf)# rd route-distinguisher
         

        Creates a VRF table by specifying a route distinguisher. Enter either an AS number and an arbitrary number (xxx:y) or an IP address and arbitrary number (A.B.C.D:y).

         
        Step 6route-target {export | import | both} route-target-ext-community


        Example: 
        Switch(config-vrf)# route-target {export | import | both} route-target-ext-community
         

        Creates a list of import, export, or import and export route target communities for the specified VRF. Enter either an AS system number and an arbitrary number (xxx:y) or an IP address and an arbitrary number (A.B.C.D:y).

        The route-target-ext-community value should be the same as the route-distinguisher value entered in Step 4.

         
        Step 7import map route-map


        Example: 
        Switch(config-vrf)# import map route-map
         

        (Optional) Associates a route map with the VRF.

         
        Step 8 interface interface-id


        Example: 
        Switch (config)# interface interface-id
         

        Enters interface configuration mode and specifies the Layer 3 interface to be associated with the VRF. The interface can be a routed port or a SVI.

         
        Step 9 vrf forwarding vrf-name


        Example: 
        Switch (config-sg-tacacs+)# vrf forwarding vrf-name
         

        Associates the VRF with the Layer 3 interface.

         
        Step 10 ip address ip-address mask


        Example: 
        Switch (config-if)# ip address ip-address mask
         

        Configures IP address for the Layer 3 interface.

         
        Step 11ip pim sparse-mode


        Example: 
        Switch(config-if)# ip pim sparse-mode
         

        Enables PIM on the VRF-associated Layer 3 interface.

         
        Step 12end


        Example: 
        Switch(config-if)# end
         

        Returns to privileged EXEC mode.

         
        Step 13show ip vrf [brief | detail | interfaces] [vrf-name]

        Example: 
        show ip vrf [brief | detail | interfaces] [vrf-name]
         

        Verifies the configuration. Display information about the configured VRFs.

         
        Step 14copy running-config startup-config


        Example: 
        Switch# copy running-config startup-config
         

        (Optional) Saves your entries in the configuration file.

         

        The following example shows how to configure multicast within a VRF table:

        Switch(config)# ip routing
Switch(config)# ip vrf multiVrfA
Switch(config-vrf)# ip multicast-routing vrf multiVrfA
Switch(config-vrf)# interface GigabitEthernet3/1/0
Switch(config-if)# vrf forwarding multiVrfA
Switch(config-if)# ip address 172.21.200.203 255.255.255.0
Switch(config-if)# ip pim sparse-mode

        Configuring a VPN Routing Session

        Procedure

           Command or ActionPurpose
          Step 1 configure terminal


          Example: 
          Switch# configure terminal
           

          Enters global configuration mode.

           
          Step 2 router ospf process-id vrf vrf-name


          Example: 
          Switch(config)# router ospf process-id vrf vrf-name
           

          Enables OSPF routing, specifies a VPN forwarding table, and enters router configuration mode.

           
          Step 3 log-adjacency-changes


          Example: 
          Switch(config-router)# log-adjacency-changes
           

          (Optional) Logs changes in the adjacency state (the default state).

           
          Step 4 redistribute bgp autonomous-system-number subnets


          Example: 
          Switch(config-router)# redistribute bgp autonomous-system-number subnets
           

          Sets the switch to redistribute information from the BGP network to the OSPF network.

           
          Step 5network network-number area area-id


          Example: 
          Switch(config-router)# network network-number area area-id
           

          Defines a network address and mask on which OSPF runs and the area ID for that network address.

           
          Step 6end


          Example: 
          Switch(config-router)# end
           

          Returns to privileged EXEC mode.

           
          Step 7show ip ospf process-id


          Example: 
          Switch# show ip ospf process-id
           

          Verifies the configuration of the OSPF network.

           
          Step 8copy running-config startup-config


          Example: 
          Switch# copy running-config startup-config
           

          (Optional) Saves your entries in the configuration file.

          Use the no router ospf process-id vrf vrf-name global configuration command to disassociate the VPN forwarding table from the OSPF routing process.

            
          Switch(config)# ip vrf VRF-RED 
Switch(config-vrf)# rd 1:1 
Switch(config-vrf)# exit 
Switch(config)# router eigrp virtual-name
Switch(config-router)# address-family ipv4 vrf VRF-RED autonomous-system 1
Switch(config-router-af)# network 10.0.0.0 0.0.0.255
Switch(config-router-af)# topology base
Switch(config-router-topology)# default-metric 10000 100 255 1 1500 
Switch(config-router-topology)# exit-af-topology
Switch(config-router-af)# exit-address-family

          Configuring BGP PE to CE Routing Sessions

          Procedure
             Command or ActionPurpose
            Step 1 configure terminal


            Example: 
            Switch# configure terminal
             

            Enters global configuration mode.

             
            Step 2 router bgp autonomous-system-number


            Example: 
            Switch(config)# router bgp autonomous-system-number
             

            Configures the BGP routing process with the AS number passed to other BGP routers and enters router configuration mode.

             
            Step 3 network network-number mask network-mask


            Example: 
            Switch(config-router)# network network-number mask network-mask
             

            Specifies a network and mask to announce using BGP.

             
            Step 4redistribute ospf process-id match internal


            Example: 
            Switch(config-router)# redistribute ospf process-id match internal
             

            Sets the switch to redistribute OSPF internal routes.

             
            Step 5network network-number area area-id


            Example: 
            Switch(config-router)# network network-number area area-id
             

            Defines a network address and mask on which OSPF runs and the area ID for that network address.

             
            Step 6address-family ipv4 vrf vrf-name


            Example: 
            Switch(config-router-af)# address-family ipv4 vrf vrf-name
             

            Defines BGP parameters for PE to CE routing sessions and enters VRF address-family mode.

             
            Step 7neighbor address remote-as as-number


            Example: 
            Switch(config-router-af)# neighbor address remote-as as-number
             

            Defines a BGP session between PE and CE routers.

             
            Step 8neighbor address activate


            Example: 
            Switch(config-router-af)# neighbor address activate
             

            Activates the advertisement of the IPv4 address family.

             
            Step 9end


            Example: 
            Switch(config-router-af)# end
             

            Returns to privileged EXEC mode.

             
            Step 10show ip bgp [ipv4] [neighbors]


            Example: 
            Switch# show ip bgp [ipv4] [neighbors]
             

            Verifies BGP configuration.

            Use the no router bgp autonomous-system-number global configuration command to delete the BGP routing process. Use the command with keywords to delete routing characteristics.

             

            Configuring IPv4 VRFs

            Procedure
               Command or ActionPurpose
              Step 1configure terminal


              Example: 
              Switch# configure terminal
               

              Enters global configuration mode.

               
              Step 2ip routing


              Example: 
              Switch# configure terminal
               

              Enters global configuration mode.

               
              Step 3ip vrf vrf-name


              Example: 
              Switch(config)# ip vrf vrf-name
               

              Names the VRF and enters VRF configuration mode.

               
              Step 4rd route-distinguisher


              Example: 
              Switch(config-vrf)# rd route-distinguisher
               

              Creates a VRF table by specifying a route distinguisher. Enter either an Autonomous System number number and an arbitrary number (xxx:y) or an IP address and arbitrary number (A.B.C.D:y).

               
              Step 5route-target {export | import | both} route-target-ext-community


              Example: 
              Switch(config-vrf)# route-target {export | import | both} route-target-ext-community
               

              Creates a list of import, export, or import and export route target communities for the specified VRF. Enter either an AS system number and an arbitrary number (xxx:y) or an IP address and an arbitrary number (A.B.C.D:y).

              Note   

              This command is effective only if BGP is running.

               
              Step 6import map route-map


              Example: 
              Switch(config-vrf)# import map route-map
               

              (Optional) Associates a route map with the VRF.

               
              Step 7interface interface-id


              Example: 
              Switch(config-vrf)# interface interface-id
               

              Enters interface configuration mode and specify the Layer 3 interface to be associated with the VRF. The interface can be a routed port or SVI.

               
              Step 8vrf forwarding vrf-name


              Example: 
              Switch(config-if)# vrf forwarding vrf-name
               

              Associates the VRF with the Layer 3 interface.

               
              Step 9end


              Example: 
              Switch(config-if)# end
               

              Returns to privileged EXEC mode.

               
              Step 10show ip vrf [brief | detail | interfaces] [vrf-name]


              Example: 
              Switch# show ip vrf [brief | detail | interfaces] [vrf-name]
               

              Verifies the configuration. Displays information about the configured VRFs.

               
              Step 11copy running-config startup-config


              Example: 
              Switch# copy running-config startup-config
               

              (Optional) Saves your entries in the configuration file.

              Note   

              For complete syntax and usage information for the following commands, see the switch command reference for this release and see the Cisco IOS Switching Services Command Reference.

              Use the no ip vrf vrf-name global configuration command to delete a VRF and to remove all interfaces from it. Use the no vrf forwarding interface configuration command to remove an interface from the VRF.

               

              Configuring VRF-lite for IPv6

              Configuring VRF-Aware Services

              IPv6 services can be configured on global interfaces and within the global routing instance. IPv6 services are enhanced to run on multiple routing instances; they are VRF-aware. Any configured VRF in the system can be specified for a VRF-aware service.

              VRF-aware services are implemented in platform-independent modules. VRF provides multiple routing instances in Cisco IOS. Each platform has its own limit on the number of VRFs it supports.

              VRF-aware services have the following characteristics:

              • The user can ping a host in a user-specified VRF.

              • Neighbor Discovery entries are learned in separate VRFs. The user can display Neighbor Discovery (ND) entries for specific VRFs.

              The following services are VRF-aware:

              • Ping

              • Unicast Reverse Path Forwarding (uRPF)

              • Traceroute

              • FTP and TFTP

              • Telnet and SSH

              • NTP

              Configuring the User Interface for PING

              Perform the following task to configure a VRF-aware ping:
              Procedure
                 Command or ActionPurpose
                Step 1 ping vrf vrf-name ipv6-host


                Example: 
                Switch# ping vrf vrf-name ipv6-host
                 

                Pings an IPv6 host or address in the specified VRF.

                 

                Configuring the User Interface for uRPF

                You can configure uRPF on an interface assigned to a VRF. Source lookup is performed in the VRF table

                Procedure
                   Command or ActionPurpose
                  Step 1 configure terminal


                  Example: 
                  Switch# configure terminal
                   

                  Enters global configuration mode.

                   
                  Step 2 interface interface-id


                  Example: 
                  Switch (config)# interface interface-id
                   

                  Enters interface configuration mode and specifies the Layer 3 interface to configure.

                   
                  Step 3 no switchport


                  Example: 
                  Switch (config-if)# no switchport
                   

                  Removes the interface from Layer 2 configuration mode if it is a physical interface.

                   
                  Step 4 vrf forwarding vrf-name


                  Example: 
                  Switch (config-if)# vrf forwarding vrf-name
                   

                  Configures VRF on the interface.

                   
                  Step 5 ipv6 address ip-address subnet-mask


                  Example: 
                  Switch (config-if)# ip address ip-address mask
                   

                  Enters the IPv6 address for the interface.

                   
                  Step 6ipv6 verify unicast source reachable-via rx allow-default


                  Example: 
                  Switch(config-if)# ipv6 verify unicast source reachable-via 
rx allow-default
                   

                  Enables uRPF on the interface.

                   
                  Step 7end


                  Example: 
                  Switch(config-if)# end
                   

                  Returns to privileged EXEC mode.

                   

                  Configuring the User Interface for Traceroute

                  Procedure
                     Command or ActionPurpose
                    Step 1traceroute vrf vrf-name ipv6address


                    Example: 
                    Switch# traceroute vrf vrf-name ipv6address
                     

                    Specifies the name of a VPN VRF in which to find the destination address.

                     

                    Configuring the User Interface for Telnet and SSH

                    Procedure
                       Command or ActionPurpose
                      Step 1 telnet ipv6-address/vrf vrf-name


                      Example: 
                      Switch# telnet ipv6-address/vrf vrf-name
                       

                      Connects through Telnet to an IPv6 host or address in the specified VRF.

                       
                      Step 2 ssh -l username -vrf vrf-name ipv6-host


                      Example: 
                      Switch# ssh -l username -vrf  vrf-name ipv6-host
                       

                      Connects through SSH to an IPv6 host or address in the specified VRF.

                       

                      Configuring the User Interface for NTP

                      Procedure
                         Command or ActionPurpose
                        Step 1configure terminal


                        Example: 
                        
Device# configure terminal
                         

                        Enters the global configuration mode.

                         
                        Step 2 ntp server vrf vrf-name ipv6-host


                        Example: 
                        Device(config)# ntp server vrf vrf-name ipv6-host
                         

                        Configure the NTP server in the specified VRF.

                         
                        Step 3ntp peer vrf vrf-name ipv6-host


                        Example: 
                        Device(config)# ntp peer vrf vrf-name ipv6-host
                         

                        Configure the NTP peer in the specified VRF.

                         

                        Configuring IPv6 VRFs

                        Procedure
                           Command or ActionPurpose
                          Step 1configure terminal


                          Example: 
                          Switch# configure terminal
                           

                          Enters global configuration mode.

                           
                          Step 2vrf definition vrf-name


                          Example: 
                          Switch(config)# vrf definition vrf-name
                           

                          Names the VRF and enters VRF configuration mode.

                           
                          Step 3rd route-distinguisher


                          Example: 
                          Switch(config-vrf)# rd route-distinguisher
                           

                          (Optional) Creates a VRF table by specifying a route distinguisher. Enter either an Autonomous System number and an arbitrary number (xxx:y) or an IP address and arbitrary number (A.B.C.D:y).

                           
                          Step 4 address-family ipv4 | ipv6


                          Example: 
                          Switch(config-vrf)# address-family ipv4 | ipv6
                           

                          (Optional) IPv4 by default. Configuration MUST for IPv6.

                           
                          Step 5route-target {export | import | both} route-target-ext-community


                          Example: 
                          Switch(config-vrf)# route-target {export | import | both} route-target-ext-community
                           

                          Creates a list of import, export, or import and export route target communities for the specified VRF. Enter either an AS system number and an arbitrary number (xxx:y) or an IP address and an arbitrary number (A.B.C.D:y).

                          Note   

                          This command is effective only if BGP is running.

                           
                          Step 6exit-address-family


                          Example: 
                          Switch(config-vrf)# exit-address-family
                           

                          Exits VRF address-family configuration mode and return to VRF configuration mode.

                           
                          Step 7vrf definition vrf-name


                          Example: 
                          Switch(config)# vrf definition vrf-name
                           

                          Enters VRF configuration mode.

                           
                          Step 8ipv6 multicast multitopology


                          Example: 
                          Switch(config-vrf-af)# ipv6 multicast multitopology
                           

                          Enables multicast specific RPF topology.

                           
                          Step 9address-family ipv6 multicast


                          Example: 
                          Switch(config-vrf)# address-family ipv6 multicast
                           

                          Enter multicast IPv6 address-family.

                           
                          Step 10end


                          Example: 
                          Switch(config-vrf-af)# end
                           

                          Returns to privileged EXEC mode.

                           

                          This example shows how to configure VRFs:

                          Switch(config)#  vrf definition red
Switch(config-vrf)# rd 100:1 
Switch(config-vrf)# address family ipv6
Switch(config-vrf-af)# route-target both 200:1
Switch(config-vrf)# exit-address-family
Switch(config-vrf)# vrf definition red
Switch(config-if)# ipv6 multicast multitopology
Switch(config-if)# address-family ipv6 multicast
Switch(config-vrf-af)# end
Switch#

                          Associating Interfaces to the Defined VRFs

                          Procedure
                             Command or ActionPurpose
                            Step 1interface interface-id


                            Example: 
                            Switch(config-vrf)# interface interface-id
                             

                            Enters interface configuration mode and specify the Layer 3 interface to be associated with the VRF. The interface can be a routed port or SVI.

                             
                            Step 2no switchport


                            Example: 
                            Switch(config-if)# no switchport
                             

                            Removes the interface from configuration mode if it is a physical interface.

                             
                            Step 3vrf forwarding vrf-name


                            Example: 
                            Switch(config-if)# vrf forwarding vrf-name
                             

                            Associates the VRF with the Layer 3 interface.

                             
                            Step 4ipv6 enable


                            Example: 
                            Switch(config-if)# ipv6 enable
                             

                            Enable IPv6 on the interface.

                             
                            Step 5ipv6 address ip-address subnet-mask


                            Example: 
                            Switch(config-if)# ipv6 address ip-address subnet-mask
                             

                            Enters the IPv6 address for the interface.

                             
                            Step 6show ipv6 vrf [brief | detail | interfaces] [vrf-name]


                            Example: 
                            Switch# show ipv6 vrf [brief | detail | interfaces] [vrf-name]
                             

                            Verifies the configuration. Displays information about the configured VRFs.

                             
                            Step 7copy running-config startup-config


                            Example: 
                            Switch# copy running-config startup-config
                             

                            (Optional) Saves your entries in the configuration file.

                             
                            This example shows how to associate an interface to VRFs:
                            Switch(config-vrf)# interface ethernet0/1
Switch(config-if)# vrf forwarding red
Switch(config-if)# ipv6 enable
Switch(config-if)# ipv6 address 5000::72B/64

                            Populate VRF with Routes via Routing Protocols

                            Configuring VRF Static Routes

                            Procedure
                               Command or ActionPurpose
                              Step 1configure terminal


                              Example: 
                              Switch# configure terminal
                               

                              Enters global configuration mode.

                               
                              Step 2ipv6 route [vrf vrf-name] ipv6-prefix/prefix-length {ipv6-address | interface-type interface-number [ipv6-address]}


                              Example: 
                              Switch(config)# ipv6 route [vrf vrf-name] ipv6-prefix/prefix-length {ipv6-address | interface-type interface-number [ipv6-address]}
                               

                              To configure static routes specific to VRF.

                                
                              Switch(config)# ipv6 route vrf v6a 7000::/64 TenGigabitEthernet32 4000::2

                              Configuring OSPFv3 Router Process

                              Procedure
                                 Command or ActionPurpose
                                Step 1configure terminal


                                Example: 
                                Switch# configure terminal
                                 

                                Enters global configuration mode.

                                 
                                Step 2 router ospfv3 process-id


                                Example: 
                                Switch(config)# router ospfv3 process-id
                                 

                                Enables OSPFv3 router configuration mode for the IPv6 address family.

                                 
                                Step 3 area area-ID [default-cot | nssa | stub]


                                Example: 
                                Switch(config-router)# area area-ID [default-cot | nssa | stub]
                                 

                                Configures the OSPFv3 area.

                                 
                                Step 4 router-id router-id


                                Example: 
                                Switch(config-router)# router-id router-id
                                 

                                Use a fixed router ID.

                                 
                                Step 5 address-family ipv6 unicast vrf vrf-name


                                Example: 
                                Switch(config-router)# address-family ipv6 unicast vrf vrf-name
                                 

                                Enters IPv6 address family configuration mode for OSPFv3 in VRF vrf-name

                                 
                                Step 6redistribute source-protocol [process-id] options


                                Example: 
                                Switch(config-router)# redistribute source-protocol [process-id] options
                                 

                                Redistributes IPv6 routes from one routing domain into another routing domain.

                                 
                                Step 7end


                                Example: 
                                Switch(config-router)# end
                                 

                                Returns to privileged EXEC mode.

                                 
                                This example shows how configure the OSPFv3 router process:
                                Switch(config-router)# router ospfv3 1
Switch(config-router)# router-id 1.1.1.1
Switch(config-router)# address-family ipv6 unicast
Switch(config-router-af)# exit-address-family

                                Enabling OSPFv3 on an Interface

                                Procedure
                                   Command or ActionPurpose
                                  Step 1configure terminal


                                  Example: 
                                  Switch# configure terminal
                                   

                                  Enters global configuration mode.

                                   
                                  Step 2interface type-number


                                  Example: 
                                  Switch(config-vrf)# interface type-number
                                   

                                  Specifies an interface type and number, and places the switch in interface configuration mode.

                                   
                                  Step 3 ospfv3 process-id area area-ID ipv6 [instance instance-id]


                                  Example: 
                                  Switch(config-if)# ospfv3 process-id area area-ID ipv6 [instance instance-id]
                                   

                                  Enables OSPFv3 on an interface with IPv6 AF.

                                   
                                  Step 4end


                                  Example: 
                                  Switch(config-if)# end
                                   

                                  Returns to privileged EXEC mode.

                                   
                                  This example show how to enable OSPFv3 on an interface:
                                  Switch(config)# interface GigabitEthernet2/1
Switch(config-if)# no switchport
Switch(config-if)# ipv6 address 4000::2/64
Switch(config-if)# ipv6 enable
Switch(config-if)# ipv6 ospf 1 area 0
Switch(config-if)# end

                                  Configuring EIGRPv6 Routing Process

                                  Procedure
                                     Command or ActionPurpose
                                    Step 1configure terminal


                                    Example: 
                                    Switch# configure terminal
                                     

                                    Enters global configuration mode.

                                     
                                    Step 2 router eigrp virtual-instance-name


                                    Example: 
                                    Switch(config)# router eigrp virtual-instance-name
                                     

                                    Configures the EIGRP routing process and enters router configuration mode.

                                     
                                    Step 3 address-family ipv6 vrf vrf-name autonomous-system autonomous-system-number


                                    Example: 
                                    Switch(config-router)# address-family ipv6 vrf vrf-name autonomous-system autonomous-system-number
                                     

                                    Enables EIGRP IPv6 VRF-Lite and enters address family configuration mode.

                                     
                                    Step 4 topology {base | topology-name tid number


                                    Example: 
                                    Switch(config-router-af)# topology {base | topology-name tid number
                                     

                                    Configures an EIGRP process to route IP traffic under the specified topology instance and enters address family topology configuration mode.

                                     
                                    Step 5exit-aftopology


                                    Example: 
                                    Switch(config-router-af-topology)# exit-aftopology
                                     

                                    Exits address family topology configuration mode.

                                     
                                    Step 6eigrp router-id ip-address


                                    Example: 
                                    Switch(config-router)# eigrp router-id ip-address
                                     

                                    Enables the use of a fixed router-id.

                                     
                                    Step 7end


                                    Example: 
                                    Switch(config-router)# end
                                     

                                    Exits router configuration mode.

                                     
                                    This example shows how to configure an EIGRP routing process:
                                    Switch(config)# router eigrp test
Switch(config-router)# address-family ipv6 unicast vrf b1 autonomous-system 10
Switch(config-router-af)# topology base
Switch(config-router-af-topology)# exit-af-topology
Switch(config-router)# eigrp router-id 2.3.4.5
Switch(config-router)# exit-address-family

                                    Configuring EBGPv6 Routing Process

                                    Procedure
                                       Command or ActionPurpose
                                      Step 1configure terminal


                                      Example: 
                                      Switch# configure terminal
                                       

                                      Enters global configuration mode.

                                       
                                      Step 2router bgp as-number


                                      Example: 
                                      Switch(config)# router bgp as-number
                                       

                                      Enters router configuration mode for the specified routing process.

                                       
                                      Step 3neighbor peer-group-name peer-group


                                      Example: 
                                      Switch(config-router)# neighbor peer-group-name peer-group
                                       

                                      Creates a multiprotocol BGP peer group.

                                       
                                      Step 4neighbor {ip-address | ipv6-address[%] | peer-group-name}remote-as autonomous-system-number [alternate-as autonomous-system-number ...]


                                      Example: 
                                      Switch(config-router)# neighbor {ip-address | ipv6-address[%] | peer-group-name}remote-as autonomous-system-number [alternate-as autonomous-system-number ...]
                                       

                                      Adds the IPv6 address of the neighbor in the specified autonomous system to the IPv6 multiprotocol BGP neighbor table of the local router.

                                       
                                      Step 5address-family ipv6 [vrf vrf-name] [unicast | multicast | vpnv6]


                                      Example: 
                                      Switch(config-router)# address-family ipv6 [vrf vrf-name] [unicast | multicast | vpnv6]
                                       

                                      Specifies the IPv6 address family, and enters address family configuration mode.

                                      • The unicast keyword specifies the IPv6 unicast address family. By default, the switch is placed in configuration mode for the IPv6 unicast address family if the unicast keyword is not specified with the address-family ipv6command.

                                      • The multicast keyword specifies IPv6 multicast address prefixes.

                                       
                                      Step 6neighbor ipv6-address peer-group peer-group-name


                                      Example: 
                                      Switch(config-router-af)# neighbor ipv6-address peer-group peer-group-name
                                       

                                      Assigns the IPv6 address of a BGP neighbor to a peer group.

                                       
                                      Step 7neighbor {ip-address | peer-group-name | ipv6-address[%]}route-map map-name {in | out}


                                      Example: 
                                      Switch(config-router-af)# neighbor {ip-address | peer-group-name | ipv6-address[%]}route-map map-name {in | out}
                                       

                                      Applies a route map to incoming or outgoing routes. Changes to the route map will not take effect for existing peers until the peering is reset or a soft reset is performed. Using the clear bgp ipv6 command with the soft and in keywords will perform a soft reset.

                                       
                                      Step 8exit


                                      Example: 
                                      Switch(config-router-af)# exit
                                       

                                      Exits address family configuration mode, and returns the router to router configuration mode.

                                       
                                      This example shows how to configure EBRPv6:
                                      Switch(config)# router bgp 2
Switch(config-router)# bgp router-id 2.2.2.2
Switch(config-router)# bgp log-neighbor-changes
Switch(config-router)# no bgp default ipv4-unicast
Switch(config-router)# neighbor 2500::1 remote-as 1
Switch(config-router)# neighbor 4000::2 remote-as 3
Switch(config-router)# address-family ipv6 vrf b1
Switch(config-router-af)# network 2500::/64
Switch(config-router-af)# network 4000::/64
Switch(config-router-af)# neighbor 2500::1 remote-as 1
Switch(config-router-af)# neighbor 2500::1 activate
Switch(config-router-af)# neighbor 4000::2 remote-as 3
Switch(config-router-af)# neighbor 4000::2 activate
Switch(config-router-af)# exit-address-family

                                      Additional Information for VRF-lite

                                      VPN Co-existence Between IPv4 and IPv6

                                      Backward compatibility between the “older” CLI for configuring IPv4 and the “new” CLI for IPv6 exists. This means that a configuration might contain both CLI. The IPv4 CLI retains the ability to have on the same interface, an IP address defined within a VRF as well as an IPv6 address defined in the global routing table.

                                      For example:
                                      vrf definition red
 rd 100:1 
 address family ipv6
 route-target both 200:1 
 exit-address-family
!
ip vrf blue
 rd 200:1 
 route-target both 200:1
!
interface Ethernet0/0
 vrf forwarding red
 ip address 50.1.1.2 255.255.255.0
 ipv6 address 4000::72B/64
!
interface Ethernet0/1
 vrf forwarding blue
 ip address 60.1.1.2 255.255.255.0
 ipv6 address 5000::72B/64

                                      In this example, all addresses (v4 and v6) defined for Ethernet0/0 refer to VRF red whereas for Ethernet0/1, the IP address refers to VRF blue but the ipv6 address refers to the global IPv6 routing table.

                                      Verifying VRF-lite Configuration

                                      Displaying IPv4 VRF-lite Status

                                      To display information about VRF-lite configuration and status, perform one of the following tasks:

                                      Command

                                      Purpose

                                      		 
                                      Switch# show ip protocols vrf vrf-name

                                      Displays routing protocol information associated with a VRF.

                                      		 
                                      Switch# show ip route vrf vrf-name [connected] [protocol
[as-number]] [list] [mobile] [odr] [profile] [static] [summary][supernets-only]

                                      Displays IP routing table information associated with a VRF.

                                      		 
                                      Switch# show ip vrf [brief | detail | interfaces] [vrf-name]

                                      Displays information about the defined VRF instances.

                                      		 
                                      Switch# bidir vrf instance-name a.b.c.d | active | bidriectional| count | interface | proxy | pruned | sparse | ssm | static | summary

                                      Displays information about the defined VRF instances.
                                      This example shows how to display multicast route table information within a VRF instance:
                                      Switch# show ip mroute 226.0.0.2
IP Multicast Routing Table
Flags: S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
       L - Local, P - Pruned, R - RP-bit set, F - Register flag,
       T - SPT-bit set, J - Join SPT, M - MSDP created entry, E - Extranet,
       X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
       U - URD, I - Received Source Specific Host Report,
       Z - Multicast Tunnel, z - MDT-data group sender,
       Y - Joined MDT-data group, y - Sending to MDT-data group,
       G - Received BGP C-Mroute, g - Sent BGP C-Mroute,
       N - Received BGP Shared-Tree Prune, n - BGP C-Mroute suppressed,
       Q - Received BGP S-A Route, q - Sent BGP S-A Route,
       V - RD & Vector, v - Vector, p - PIM Joins on route,
       x - VxLAN group, c - PFP-SA cache created entry
Outgoing interface flags: H - Hardware switched, A - Assert winner, p - PIM Join
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
 
(*, 226.0.0.2), 00:01:17/stopped, RP 1.11.1.1, flags: SJCF
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    Vlan100, Forward/Sparse, 00:01:17/00:02:36
 
(5.0.0.11, 226.0.0.2), 00:01:17/00:01:42, flags: FT
  Incoming interface: Vlan5, RPF nbr 0.0.0.0
  Outgoing interface list:
    Vlan100, Forward/Sparse, 00:01:17/00:02:36

                                      Displaying IPv6 VRF-lite Status

                                      To display information about VRF-lite configuration and status, perform one of the following tasks:

                                      Command

                                      Purpose

                                      		 
                                      Switch# show ipv6 mroute vrf instance-name [X:X:X:X::X/<0-128>] [bgp] [connected] [eigrp] [interface] [isis] [local] [nd] [nsf] [ospf ] [repair] [rip] [shortcut] [static] [summary] [tag] [updated] [watch]

                                      Displays routing protocol information associated with a VRF.

                                      		 
                                      Switch# show ipv6 mfib vrf instance-name a.b.c.d | active | all | count | linkscope| route | summary | update-sets | verbose

                                      Displays information about the defined VRF instances.
                                      This example shows how to display multicast route table information within a VRF instance:
                                      show ipv6 mroute vrf vrf1 FF05:ABCD:0:0:0:0:0:1
Multicast Routing Table
Flags: S - Sparse, B - Bidir Group, s - SSM Group,
C - Connected, L - Local, I - Received Source Specific Host Report,
P - Pruned, R - RP-bit set, F - Register flag, T - SPT-bit set,
J - Join SPT, Y - Joined MDT-data group,
y - Sending to MDT-data group

g - BGP signal originated, G - BGP Signal received,
N - BGP Shared-Tree Prune received, n - BGP C-Mroute suppressed,
q - BGP Src-Active originated, Q - BGP Src-Active received
E - Extranet
Timers: Uptime/Expires
Interface state: Interface, State

(*, FF05:ABCD::1), 00:06:22/never, RP 1010:ABCD::10, flags: SCJ
Incoming interface: Port-channel33
RPF nbr: FE80::2E31:24FF:FE06:134A
Immediate Outgoing interface list:
TenGigabitEthernet4/0/18, Forward, 00:06:22/never

(3232:ABCD::2, FF05:ABCD::1), 00:04:54/00:02:16, flags: SJT
Incoming interface: Port-channel33
RPF nbr: FE80::2E31:24FF:FE06:134A
Inherited Outgoing interface list:
TenGigabitEthernet4/0/18, Forward, 00:06:22/never
                                      The following example displays the output of show ipv6 mfib command.
                                      Switch# show ipv6 mfib vrf vrf1 FF05:ABCD:0:0:0:0:0:1
Entry Flags:    C - Directly Connected, S - Signal, IA - Inherit A flag,
                ET - Data Rate Exceeds Threshold, K - Keepalive
                DDE - Data Driven Event, HW - Hardware Installed
                ME - MoFRR ECMP entry, MNE - MoFRR Non-ECMP entry, MP - MFIB 
                MoFRR Primary, RP - MRIB MoFRR Primary, P - MoFRR Primary
                MS  - MoFRR  Entry in Sync, MC - MoFRR entry in MoFRR Client.
I/O Item Flags: IC - Internal Copy, NP - Not platform switched,
                NS - Negate Signalling, SP - Signal Present,
                A - Accept, F - Forward, RA - MRIB Accept, RF - MRIB Forward,
                MA - MFIB Accept, A2 - Accept backup,
                RA2 - MRIB Accept backup, MA2 - MFIB Accept backup

Forwarding Counts: Pkt Count/Pkts per second/Avg Pkt Size/Kbits per second
Other counts:      Total/RPF failed/Other drops
I/O Item Counts:   FS Pkt Count/PS Pkt Count
VRF testvrf1
 (*,FF05:ABCD::1) Flags: C HW
   SW Forwarding: 0/0/0/0, Other: 0/0/0
   HW Forwarding:   295/0/512/0, Other: 0/0/0
   Port-channel33 Flags: A NS
   TenGigabitEthernet4/0/18 Flags: F NS
     Pkts: 0/0
 (3232:ABCD::2,FF05:ABCD::1) Flags: HW
   SW Forwarding: 50/0/512/0, Other: 111/0/111
   HW Forwarding:   4387686/14849/512/59398, Other: 0/0/0
   Port-channel33 Flags: A
   TenGigabitEthernet4/0/18 Flags: F NS
     Pkts: 0/50

Switch#

                                      Configuration Examples for VRF-lite

                                      Configuration Example for IPv4 VRF-lite

                                      OSPF is the protocol used in VPN1, VPN2, and the global network. BGP is used in the CE to PE connections. The example commands show how to configure the CE switch S8 and include the VRF configuration for switches S20 and S11 and the PE router commands related to traffic with switch S8. Commands for configuring the other switches are not included but would be similar.

                                      Figure 2. VRF-lite Configuration Example



                                      Configuring Switch S8

                                      On switch S8, enable routing and configure VRF.
                                      Switch# configure terminal 
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)# ip routing 
Switch(config)# ip vrf v11
Switch(config-vrf)# rd 800:1
Switch(config-vrf)# route-target export 800:1
Switch(config-vrf)# route-target import 800:1
Switch(config-vrf)# exit
Switch(config)# ip vrf v12
Switch(config-vrf)# rd 800:2
Switch(config-vrf)# route-target export 800:2
Switch(config-vrf)# route-target import 800:2
Switch(config-vrf)# exit
                                      Configure the loopback and physical interfaces on switch S8. Fast Ethernet interface 3/5 is a trunk connection to the PE. Interfaces 3/7 and 3/11 connect to VPNs:
                                      Switch(config)# interface loopback1
Switch(config-if)# vrf forwarding v11
Switch(config-if)# ip address 8.8.1.8 255.255.255.0
Switch(config-if)# exit

Switch(config)# interface loopback2
Switch(config-if)# vrf forwarding v12
Switch(config-if)# ip address 8.8.2.8 255.255.255.0
Switch(config-if)# exit

Switch(config)# interface FastEthernet3/5
Switch(config-if)# switchport trunk encapsulation dot1q
Switch(config-if)# switchport mode trunk
Switch(config-if)# no ip address
Switch(config-if)# exit

Switch(config)# interface FastEthernet3/8
Switch(config-if)# switchport access vlan 208
Switch(config-if)# no ip address
Switch(config-if)# exit

Switch(config)# interface FastEthernet3/11
Switch(config-if)# switchport trunk encapsulation dot1q
Switch(config-if)# switchport mode trunk
Switch(config-if)# no ip address
Switch(config-if)# exit
                                      Configure the VLANs used on switch S8. VLAN 10 is used by VRF 11 between the CE and the PE. VLAN 20 is used by VRF 12 between the CE and the PE. VLANs 118 and 208 are used for VRF for the VPNs that include switch S11 and switch S20, respectively:
                                      Switch(config)# interface Vlan10
Switch(config-if)# vrf forwarding v11
Switch(config-if)# ip address 38.0.0.8 255.255.255.0
Switch(config-if)# exit

Switch(config)# interface Vlan20
Switch(config-if)# vrf forwarding v12
Switch(config-if)# ip address 83.0.0.8 255.255.255.0
Switch(config-if)# exit

Switch(config)# interface Vlan118
Switch(config-if)# vrf forwarding v12
Switch(config-if)# ip address 118.0.0.8 255.255.255.0
Switch(config-if)# exit

Switch(config)# interface Vlan208
Switch(config-if)# vrf forwarding v11
Switch(config-if)# ip address 208.0.0.8 255.255.255.0
Switch(config-if)# exit
                                      Configure OSPF routing in VPN1 and VPN2:
                                      Switch(config)# router ospf 1 vrf vl1
Switch(config-router)# redistribute bgp 800 subnets
Switch(config-router)# network 208.0.0.0 0.0.0.255 area 0
Switch(config-router)# exit 
Switch(config)# router ospf 2 vrf vl2
Switch(config-router)# redistribute bgp 800 subnets
Switch(config-router)# network 118.0.0.0 0.0.0.255 area 0
Switch(config-router)# exit
                                      Configure BGP for CE to PE routing:
                                      Switch(config)# router bgp 800
Switch(config-router)# address-family ipv4 vrf vl2
Switch(config-router-af)# redistribute ospf 2 match internal
Switch(config-router-af)# neighbor 83.0.0.3 remote-as 100
Switch(config-router-af)# neighbor 83.0.0.3 activate
Switch(config-router-af)# network 8.8.2.0 mask 255.255.255.0
Switch(config-router-af)# exit 

Switch(config-router)# address-family ipv4 vrf vl1
Switch(config-router-af)# redistribute ospf 1 match internal
Switch(config-router-af)# neighbor 38.0.0.3 remote-as 100
Switch(config-router-af)# neighbor 38.0.0.3 activate
Switch(config-router-af)# network 8.8.1.0 mask 255.255.255.0
Switch(config-router-af)# end

                                      Configuring Switch S20

                                      Configure S20 to connect to CE:
                                      Switch# configure terminal 
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)# ip routing 
Switch(config)# interface Fast Ethernet 0/7
Switch(config-if)# no switchport
Switch(config-if)# ip address 208.0.0.20 255.255.255.0
Switch(config-if)# exit

Switch(config)# router ospf 101
Switch(config-router)# network 208.0.0.0 0.0.0.255 area 0
Switch(config-router)# end

                                      Configuring Switch S11

                                      Configure S11 to connect to CE:
                                      Switch# configure terminal 
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)# ip routing 
Switch(config)# interface Gigabit Ethernet 0/3
Switch(config-if)# switchport trunk encapsulation dot1q
Switch(config-if)# switchport mode trunk 
Switch(config-if)# no ip address
Switch(config-if)# exit

Switch(config)# interface Vlan118
Switch(config-if)# ip address 118.0.0.11 255.255.255.0
Switch(config-if)# exit

Switch(config)# router ospf 101
Switch(config-router)# network 118.0.0.0 0.0.0.255 area 0
Switch(config-router)# end

                                      Configuring the PE Switch S3

                                      On switch S3 (the router), these commands configure only the connections to switch S8:
                                      Router# configure terminal 
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)# ip vrf v1
Router(config-vrf)# rd 100:1
Router(config-vrf)# route-target export 100:1
Router(config-vrf)# route-target import 100:1
Router(config-vrf)# exit

Router(config)# ip vrf v2
Router(config-vrf)# rd 100:2
Router(config-vrf)# route-target export 100:2
Router(config-vrf)# route-target import 100:2
Router(config-vrf)# exit

Router(config)# ip cef
Router(config)# interface Loopback1
Router(config-if)# vrf forwarding v1
Router(config-if)# ip address 3.3.1.3 255.255.255.0
Router(config-if)# exit

Router(config)# interface Loopback2
Router(config-if)# vrf forwarding v2
Router(config-if)# ip address 3.3.2.3 255.255.255.0
Router(config-if)# exit

Router(config)# interface Fast Ethernet3/0.10
Router(config-if)# encapsulation dot1q 10
Router(config-if)# vrf forwarding v1
Router(config-if)# ip address 38.0.0.3 255.255.255.0
Router(config-if)# exit

Router(config)# interface Fast Ethernet3/0.20
Router(config-if)# encapsulation dot1q 20
Router(config-if)# vrf forwarding v2
Router(config-if)# ip address 83.0.0.3 255.255.255.0
Router(config-if)# exit

Router(config)# router bgp 100
Router(config-router)# address-family ipv4 vrf v2
Router(config-router-af)# neighbor 83.0.0.8 remote-as 800
Router(config-router-af)# neighbor 83.0.0.8 activate
Router(config-router-af)# network 3.3.2.0 mask 255.255.255.0
Router(config-router-af)# exit 
Router(config-router)# address-family ipv4 vrf vl
Router(config-router-af)# neighbor 83.0.0.8 remote-as 800
Router(config-router-af)# neighbor 83.0.0.8 activate
Router(config-router-af)# network 3.3.1.0 mask 255.255.255.0
Router(config-router-af)# end

                                      Configuration Example for IPv6 VRF-lite

                                      The following topology illustrates how to use OSPFv3 for CE-PE routing.

                                      Figure 3. VRF-lite Configuration Example



                                      Configuring CE1 Switch

                                      ipv6 unicast-routing 
vrf definition v1
 rd 100:1
 !
address-family ipv6
 exit-address-family
!

vrf definition v2
 rd 200:1
 !
address-family ipv6
 exit-address-family
!

interface Vlan100
 vrf forwarding v1
 ipv6 address 1000:1::1/64
 ospfv3 100 ipv6 area 0
! 

interface Vlan200
 vrf forwarding v2
 ipv6 address 2000:1::1/64
 ospfv3 200 ipv6 area 0
!         

interface GigabitEthernet 1/0/1
switchport access vlan 100
end

interface GigabitEthernet 1/0/2
switchport access vlan 200
end

interface GigabitEthernet 1/0/24
 switchport trunk encapsulation dot1q

switchport mode trunk
end

router ospfv3 100
 router-id 10.10.10.10
 !
 address-family ipv6 unicast vrf v1
  redistribute connected
  area 0 normal
 exit-address-family
!

router ospfv3 200
 router-id 20.20.20.20
 !
 address-family ipv6 unicast vrf v2
  redistribute connected
  area 0 normal
 exit-address-family
!

                                      Configuring PE Switch

                                      ipv6 unicast-routing 

vrf definition v1
 rd 100:1
 !
address-family ipv6
 exit-address-family
!

vrf definition v2
 rd 200:1
 !
address-family ipv6
 exit-address-family
!
interface Vlan600
 vrf forwarding v1
 no ipv6 address
 ipv6 address 1000:1::2/64
 ospfv3 100 ipv6 area 0
!

interface Vlan700
 vrf forwarding v2
 no ipv6 address
 ipv6 address 2000:1::2/64
 ospfv3 200 ipv6 area 0
!

interface Vlan800
 vrf forwarding v1
 ipv6 address 3000:1::7/64
 ospfv3 100 ipv6 area 0
!
interface Vlan900
 vrf forwarding v2
 ipv6 address 4000:1::7/64
 ospfv3 200 ipv6 area 0
!

interface GigabitEthernet 1/0/1
 switchport trunk encapsulation dot1q
 switchport mode trunk
 exit

interface GigabitEthernet 1/0/2
 switchport trunk encapsulation dot1q

switchport mode trunk
	exit

router ospfv3 100
 router-id 30.30.30.30
 !
 address-family ipv6 unicast vrf v1
  redistribute connected
  area 0 normal
 exit-address-family
	!
address-family ipv6 unicast vrf v2
  redistribute connected
  area 0 normal
 exit-address-family
	!

                                      Configuring CE2 Switch

                                      ipv6 unicast-routing 

vrf definition v1
 rd 100:1
 !
address-family ipv6
 exit-address-family
!

vrf definition v2
 rd 200:1
 !
address-family ipv6
 exit-address-family
!

interface Vlan100
 vrf forwarding v1

ipv6 address 1000:1::3/64
 ospfv3 100 ipv6 area 0
!

interface Vlan200
 vrf forwarding v2
 ipv6 address 2000:1::3/64
 ospfv3 200 ipv6 area 0
!

interface GigabitEthernet 1/0/1
switchport access vlan 100
end

interface GigabitEthernet 1/0/2
switchport access vlan 200
end

interface GigabitEthernet 1/0/24
 switchport trunk encapsulation dot1q
 switchport mode trunk
 end

router ospfv3 100
 router-id 40.40.40.40
 !
 address-family ipv6 unicast vrf v1
  redistribute connected
  area 0 normal
 exit-address-family
!

router ospfv3 200
 router-id 50.50.50.50
 !
 address-family ipv6 unicast vrf v2
  redistribute connected

area 0 normal
 exit-address-family
!

                                      Feature History and Information for Multicast VRF-lite

                                      Feature Name

                                      Release

                                      Feature Information

                                      IPv6 Multicast support with VRF-Lite

                                      IPv6 VRF-Lite allows a service provider to support two or more VPNs with overlapping IP addresses using one interface.

                                      This feature was introduced.