Ipv6 Over MPLS: 6PE and 6VPE

IPv6 over MPLS: 6PE and 6VPE

This feature module describes how to implement IPv6 VPN Provider Edge Transport over MPLS (IPv6 on Provider Edge Routers [6PE] and IPv6 on VPN Provider Edge Routers [6VPE]) on the Cisco ASR 901 Series Aggregation Services Routers. • Finding Feature Information, on page 1 • Prerequisites, on page 1 • Restrictions, on page 2 • Feature Overview, on page 2 • Supported Features, on page 4 • Scalability Numbers, on page 4 • How to Configure IPv6 over MPLS: 6PE and 6VPE, on page 5 • Configuration Examples, on page 16 • Additional References, on page 18 • Feature Information for IPv6 over MPLS: 6PE and 6VPE, on page 19 Finding Feature Information Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module. Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn . An account on Cisco.com is not required.

Prerequisites • Cisco IOS Release 15.2(2)SNI or a later release that supports the IPv6 over MPLS: 6PE and 6VPE feature must be installed previously on the Cisco ASR 901 Series Aggregation Services Router. • Multiprotocol Label Switching (MPLS) in provider backbone devices. • MPLS with Virtual Private Network (VPN) code in provider devices with VPN provider edge (PE) devices. • Border Gateway Protocol (BGP) in all devices providing a VPN service.

IPv6 over MPLS: 6PE and 6VPE 1 IPv6 over MPLS: 6PE and 6VPE Restrictions

• Cisco Express Forwarding switching in every MPLS-enabled device.

Restrictions The following restrictions are applicable for the IPv6 over MPLS: 6PE and 6VPE feature on the Cisco IOS Release 15.2(2)SNI. • All the existing MPLS and IPv6 restrictions are applicable, as the base infrastructure of IPv6 and IPv4 MPLS remains the same. • 6PE and 6VPE is supported only on the SVI interfaces. • The number of global VRFs supported is the same as that of IPv4, as both the IPv4 and IPv6 VPN Routing and Forwarding (VRF) share the resources from the global VRF pool. • The number of IPv6 VRFs supported is restricted to 113, though the maximum number of configurable VRFs are 127. • For the single label per prefix mode allocation, the 6PE and 6VPE scale is limited by the number of labels available in the box (4000 labels). • Supports only static routes and BGP for IPv6 in VRF context.

Feature Overview The IPv6 over MPLS: 6PE and 6VPE feature enables the service providers running an MPLS/IPv4 infrastructure to offer IPv6 services without any major changes in the infrastructure. This feature offers the following options to the service providers: • Connect to other IPv6 networks accessible across the MPLS core • Provide access to IPv6 services and resources that service provider provides • Provide IPv6 VPN services without going for complete overhaul of existing MPLS/IPv4 core 6PE and 6VPE uses the existing MPLS/IPv4 core infrastructure for IPv6 transport. It enables IPv6 sites to communicate with each other over an MPLS/IPv4 core network using MPLS label switched paths (LSPs). This feature relies heavily on multiprotocol Border Gateway Protocol (BGP) extensions in the IPv4 network configuration on the provider edge (PE) router to exchange IPv6 reachability information (in addition to an MPLS label) for each IPv6 address prefix. Edge routers are configured as dual-stack, running both IPv4 and IPv6, and use the IPv4 mapped IPv6 address for IPv6 prefix reachability exchange.

Benefits of 6PE and 6VPE 6PE and 6VPE offers the following benefits to service providers: • Minimal operational cost and risk—No impact on existing IPv4 and MPLS services. • Only provider edge routers require upgrade—A 6PE and 6VPE router can be an existing PE router or a new one dedicated to IPv6 traffic. • No impact on IPv6 customer edge (CE) routers—The ISP can connect to any CE router running Static, IGP or EGP. • Production services ready—An ISP can delegate IPv6 prefixes. • IPv6 introduction into an existing MPLS service—6PE and 6VPE routers can be added at any time.

IPv6 over MPLS: 6PE and 6VPE 2 IPv6 over MPLS: 6PE and 6VPE IPv6 on Provider Edge Routers

IPv6 on Provider Edge Routers 6PE is a technique that provides global IPv6 reachability over IPv4 MPLS. It allows one shared routing table for all other devices. 6PE allows IPv6 domains to communicate with one another over the IPv4 without an explicit tunnel setup, requiring only one IPv4 address per IPv6 domain. While implementing 6PE, the provider edge routers are upgraded to support 6PE, while the rest of the core network is not touched (IPv6 unaware). This implementation requires no reconfiguration of core routers because forwarding is based on labels rather than on the IP header itself. This provides a cost-effective strategy for deploying IPv6.The IPv6 reachability information is exchanged by PE routers using multiprotocol Border Gateway Protocol (mp-iBGP) extensions. 6PE relies on mp-iBGP extensions in the IPv4 network configuration on the PE router to exchange IPv6 reachability information in addition to an MPLS label for each IPv6 address prefix to be advertised. PE routers are configured as dual stacks, running both IPv4 and IPv6, and use the IPv4 mapped IPv6 address for IPv6 prefix reachability exchange. The next hop advertised by the PE router for 6PE and 6VPE prefixes is still the IPv4 address that is used for IPv4 L3 VPN routes. A value of ::FFFF: is prepended to the IPv4 next hop, which is an IPv4-mapped IPv6 address. The following figure illustrates the 6PE topology.

V6 IPv6 router on the customer 6PE PE equipment, connected to CEs and entry points to the premises MPLS clouds, running a dual stack IPv6/IPv4 (IPv6 to communicate with CEs)

V4 IPv4 router on the customer P Provider routers, core of the MPLS backbone running MPLS premises and IPv4 stack

IPv6 on VPN Provider Edge Routers 6VPE is a mechanism to use the IPv4 backbone to provide VPN IPv6 services. It takes advantage of operational IPv4 MPLS backbones, eliminating the need for dual-stacking within the MPLS core. This translates to savings in operational costs and addresses the security limitations of the 6PE approach. 6VPE is more like a regular IPv4 MPLS-VPN provider edge, with an addition of IPv6 support within VRF. It provides logically separate routing table entries for VPN member devices.

IPv6 over MPLS: 6PE and 6VPE 3 IPv6 over MPLS: 6PE and 6VPE Components of MPLS-based 6VPE Network

Components of MPLS-based 6VPE Network • VPN route target communities – A list of all other members of a VPN community. • Multiprotocol BGP (MP-BGP) peering of VPN community PE routers – Propagates VRF reachability information to all members of a VPN community. • MPLS forwarding – Transports all traffic between all VPN community members across a VPN service-provider network. In the MPLS-VPN model a VPN is defined as a collection of sites sharing a common routing table. A customer site is connected to the service provider network by one or more interfaces, where the service provider associates each interface with a VPN routing table–known as the VRF table. For more conceptual information on 6PE and 6VPE, see the IPv6 VPN over MPLS guide in the MPLS: Layer 3 VPNs Configuration Guide.

Supported Features The following 6PE and 6VPE features are supported on the Cisco ASR 901 router effective with Cisco IOS Release 15.2(2) SNI: • IPv6 VRF support – Enabled for supporting 6VPE • MPLS VPN 6VPE and 6PE – Provides IPV6 reachability for IPv6 edge routers across an MPLS network backbone running an IPv4 control plane, without making changes to the software on the MPLS P routers. • 6VPE and 6PE with QoS – Supports QoS provisioning in 6PE and 6VPE networks by using existing QoS infrastructure and configuration. • MPLS VPN - VRF command for IPv4 and IPv6 VPN – Supports commands that allows users to enable IPv4 and IPv6 in the same VRF.

Note All the above features are built upon existing IPv4, IPv6, MPLS and BGP infrastructure in the IOS and Cisco ASR 901 data plane support.

Scalability Numbers Table 1: Scalability Numbers for 6PE and 6VPE , on page 4 shows the scalability numbers for the 6PE and 6VPE feature.

Table 1: Scalability Numbers for 6PE and 6VPE

Interface Numbers

Number of VRFs 113

Number of VPNv6 prefixes per VRF About 4000 1

Number of VPNv6 prefixes About 4000 Table 1: Scalability Numbers for 6PE and 6VPE , on page 4

IPv6 over MPLS: 6PE and 6VPE 4 IPv6 over MPLS: 6PE and 6VPE How to Configure IPv6 over MPLS: 6PE and 6VPE

Interface Numbers

Number of global IPv6 prefixes About 4000 Table 1: Scalability Numbers for 6PE and 6VPE , on page 4

1 This number is limited by the MPLS label usage on the PE router. The maximum number of label space shared between IPv4 and IPv6 is 4000.

How to Configure IPv6 over MPLS: 6PE and 6VPE This section describes how to configure IPv6 over MPLS: 6PE and 6VPE feature:

Configuring 6PE Ensure that you configure 6PE on PE routers participating in both the IPv4 cloud and IPv6 clouds. To learn routes from both clouds, you can use any routing protocol supported on IOS (BGP, OSPF, IS-IS, EIGRP, Static). BGP running on a PE router should establish (IPv4) neighborhood with BGP running on other PEs. Subsequently, it should advertise the IPv6 prefixes learnt from the IPv6 table to the neighbors. The IPv6 prefixes advertised by BGP would automatically have IPv4-encoded-IPv6 addresses as the nexthop-address in the advertisement. To configure 6PE, complete the following steps:

SUMMARY STEPS 1. enable 2. configure terminal 3. ip cef 4. ipv6 cef 5. ipv6 unicast-routing 6. router bgp as-number 7. no synchronization 8. no bgp default ipv4-unicast 9. neighbor {ip-address | ipv6-address | peer-group-name} remote-as as-number 10. neighbor {ip-address | ipv6-address | peer-group-name} update-source interface-type interface-number 11. address-family ipv6 12. neighbor {ip-address | ipv6-address | peer-group-name} activate 13. neighbor {ip-address | ipv6-address | peer-group-name} send-label 14. exit-address-family

DETAILED STEPS

Command or Action Purpose Step 1 enable Enables privileged EXEC mode. Example: • Enter your password if prompted.

IPv6 over MPLS: 6PE and 6VPE 5 IPv6 over MPLS: 6PE and 6VPE Configuring 6PE

Command or Action Purpose

Router> enable

Step 2 configure terminal Enters global configuration mode. Example:

Router# configure terminal

Step 3 ip cef Enables Cisco Express Forwarding on the router. Example:

Router(config)# ip cef

Step 4 ipv6 cef Enables Cisco Express Forwarding for IPv6. Example:

Router(config)# ipv6 cef

Step 5 ipv6 unicast-routing Enables the forwarding of IPv6 unicast datagrams. Example:

Router(config)# ipv6 unicast-routing

Step 6 router bgp as-number Enters the number that identifies the autonomous system (AS) in which the router resides. Example: • as-number—Autonomous system number. Range for Router(config)# router bgp 100 2-byte numbers is 1 to 65535. Range for 4-byte numbers is 1.0 to 65535.65535.

Step 7 no synchronization Advertises a network route without waiting for IGP. Example:

Router(config-router)# no synchronization

Step 8 no bgp default ipv4-unicast Disables the default IPv4 unicast address family for peering session establishment. Example:

Router(config-router)# no bgp default ipv4-unicast

Step 9 neighbor {ip-address | ipv6-address | peer-group-name} Adds an entry to the BGP or multiprotocol BGP neighbor remote-as as-number table. Example: • ip-address—IP address of a peer router with which routing information will be exchanged. Router(config-router)# neighbor 10.108.1.2 • ipv6-address—IPv6 address of a peer router with remote-as 65200 which routing information will be exchanged. • peer-group-name—Name of the BGP peer group. • remote-as—Specifies a remote autonomous system.

IPv6 over MPLS: 6PE and 6VPE 6 IPv6 over MPLS: 6PE and 6VPE Configuring 6VPE

Command or Action Purpose • as-number—Number of an autonomous system to which the neighbor belongs, ranging from 1 to 65535.

Step 10 neighbor {ip-address | ipv6-address | peer-group-name} Configures BGP sessions to use any operational interface update-source interface-type interface-number for TCP connections. Example:

Router(config-router)# neighbor 172.16.2.3 update-source Loopback0

Step 11 address-family ipv6 Enters address family configuration mode for configuring routing sessions, such as BGP, that use standard IPv6 Example: address prefixes.

Router(config-router)# address-family ipv6

Step 12 neighbor {ip-address | ipv6-address | peer-group-name} Enables the exchange of information with a BGP neighbor. activate Example:

Router(config-router-af)# neighbor 10.0.0.44 activate

Step 13 neighbor {ip-address | ipv6-address | peer-group-name} Sends MPLS labels with BGP routes to a neighboring BGP send-label router. Example:

Router(config-router-af)# neighbor 10.0.0.44 send-label

Step 14 exit-address-family Exits BGP address-family submode. Example:

Router(config-router-af)# exit-address-family

Configuring 6VPE 6VPE requires setting up of IPv6 connectivity from PE to CE routers, MP-BGP peering to the neighboring PE and MPLS/IPv4 connectivity to the core network using supported routing protocols (like OSPF, IS-IS, EIGRP, Static) as done in 6PE. In addition, IPv6 VRFs have to be created on the PE routers and attached to the interfaces connecting to CE routers. IPv6-only or dual-stack(multi-protocol) VRFs support IPv6 VRF definitions. To configure 6VPE, perform the tasks given below:

Setting up IPv6 Connectivity from PE to CE Routers To configure IPv6 connectivity from PE to CE routers, complete the following steps:

IPv6 over MPLS: 6PE and 6VPE 7 IPv6 over MPLS: 6PE and 6VPE Setting up IPv6 Connectivity from PE to CE Routers

SUMMARY STEPS 1. enable 2. configure terminal 3. router bgp 4. address-family ipv6 [vrf vrf-name] 5. neighbor{ip-address | ipv6-address | peer-group-name} remote-as as-number 6. neighbor{ip-address | ipv6-address | peer-group-name} activate 7. exit-address-family

DETAILED STEPS

Command or Action Purpose Step 1 enable Enables the privileged EXEC mode. Example: • Enter your password if prompted.

Router> enable

Step 2 configure terminal Enters the global configuration mode. Example:

Router# configure terminal

Step 3 router bgp Enters the number that identifies the autonomous system (AS) in which the router resides. Autonomous system Example: number: Range for 2-byte numbers is 1 to 65535. Range for 4-byte numbers is 1.0 to 65535.65535. Router(config)# router bgp 100

Step 4 address-family ipv6 [vrf vrf-name] Enters address family configuration mode for configuring routing sessions, such as BGP, that use standard IPv6 Example: address prefixes.

Router(config-router)# address-family ipv6 • vrf—(Optional) Specifies all VRF instance tables or labeled-unicast a specific VRF table for an IPv6 address. • vrf-name—(Optional) A specific VRF table for an IPv6 address.

Step 5 neighbor{ip-address | ipv6-address | peer-group-name} Adds an entry to the BGP or multiprotocol BGP neighbor remote-as as-number table. Example: • ip-address —IP address of a peer router with which routing information will be exchanged. Router(config-router-af)# neighbor 10.108.1.2 • ipv6-address —IPv6 address of a peer router with remote-as 65200 which routing information will be exchanged. • peer-group-name —Name of the BGP peer group. • remote-as —Specifies a remote autonomous system. • as-number—Number of an autonomous system to which the neighbor belongs, ranging from 1 to 65535.

IPv6 over MPLS: 6PE and 6VPE 8 IPv6 over MPLS: 6PE and 6VPE Setting up MP-BGP Peering to the Neighboring PE

Command or Action Purpose Step 6 neighbor{ip-address | ipv6-address | peer-group-name} Enables the exchange of information with a BGP neighbor. activate Example:

Router(config-router-af)# neighbor 10.0.0.44 activate

Step 7 exit-address-family Exits the BGP address-family submode. Example:

Router(config-router-af)# exit-address-family

Setting up MP-BGP Peering to the Neighboring PE To configure MP-BGP peering to the neighboring PE routers, complete the following steps:

SUMMARY STEPS 1. enable 2. configure terminal 3. router bgp as-number 4. address-family vpnv6 5. neighbor {ip-address | ipv6-address | peer-group-name} activate 6. neighbor {ip-address | ipv6-address | peer-group-name} send-community extended 7. exit-address-family

DETAILED STEPS

Command or Action Purpose Step 1 enable Enables the privileged EXEC mode. Example: • Enter your password if prompted.

Router> enable

Step 2 configure terminal Enters the global configuration mode. Example:

Router# configure terminal

Step 3 router bgp as-number Enters the number that identifies the autonomous system (AS) in which the router resides. Autonomous system Example: number. Range for 2-byte numbers is 1 to 65535. Range for 4-byte numbers is 1.0 to 65535.65535. Router(config)# router bgp 100

IPv6 over MPLS: 6PE and 6VPE 9 IPv6 over MPLS: 6PE and 6VPE Setting up MPLS/IPv4 Connectivity with LDP

Command or Action Purpose Step 4 address-family vpnv6 Places the router in address family configuration mode for configuring routing sessions, such as BGP, that use standard Example: VPNv6 address prefixes.

Router(config-router)# address-family vpnv6

Step 5 neighbor {ip-address | ipv6-address | peer-group-name} Enable the exchange of information with a BGP neighbor. activate Example:

Router(config-router-af)# neighbor 10.0.0.44 activate

Step 6 neighbor {ip-address | ipv6-address | peer-group-name} Adds an entry to the BGP or multiprotocol BGP neighbor send-community extended table. Example:

Router(config-router-af)# neighbor 10.108.1.2 send-community extended

Step 7 exit-address-family Exits the BGP address-family submode. Example:

Router(config-router-af)# exit-address-family

Setting up MPLS/IPv4 Connectivity with LDP To configure MPLS and IPv4 connectivity with LDP, complete the following steps:

SUMMARY STEPS 1. enable 2. configure terminal 3. interface ip-address 4. ip addressip-address 5. mpls ip 6. exit

DETAILED STEPS

Command or Action Purpose Step 1 enable Enables the privileged EXEC mode. Example: • Enter your password if prompted.

Router> enable

IPv6 over MPLS: 6PE and 6VPE 10 IPv6 over MPLS: 6PE and 6VPE Creating IPv6 VRFs on PE Routers

Command or Action Purpose Step 2 configure terminal Enters the global configuration mode. Example:

Router# configure terminal

Step 3 interface ip-address Configures an interface type and to enter interface configuration mode. Example: • interface-name—Interface name. Router(config)# interface vlan 100

Step 4 ip addressip-address Sets a primary or secondary IP address for an interface. Example:

Router(config-if)# ip address 1.1.1.1 255.255.255.0

Step 5 mpls ip Enables MPLS forwarding of IP packets along normally routed paths for a particular interface. Example:

Router(config-if)# mpls ip

Step 6 exit Exits the interface configuration mode. Example:

Router(config-if)# exit

Creating IPv6 VRFs on PE Routers To configure IPv6 VRFs on the PE routers, complete the following tasks:

Configuring IPv6-only VRF To configure IPv6-only VRF, complete the following steps:

SUMMARY STEPS 1. enable 2. configure terminal 3. vrf definition vrf-name 4. address-family ipv6 5. exit-address-family

DETAILED STEPS

Command or Action Purpose Step 1 enable Enables privileged EXEC mode. Example: • Enter your password if prompted.

IPv6 over MPLS: 6PE and 6VPE 11 IPv6 over MPLS: 6PE and 6VPE Configuring Dual-stack VRF

Command or Action Purpose

Router> enable

Step 2 configure terminal Enters global configuration mode. Example:

Router# configure terminal

Step 3 vrf definition vrf-name Configures a VRF routing table instance and enters VRF configuration mode. Example: • vrf-name—Name assigned to a VRF. Router(config)# vrf definition red

Step 4 address-family ipv6 Enters address family configuration mode for configuring routing sessions that use standard IPv6 address prefixes. Example:

Router(config-vrf)# address-family ipv6

Step 5 exit-address-family Exits address-family submode. Example:

Router(config-vrf-af)# exit-address-family

Configuring Dual-stack VRF To configure dual-stack VRF, complete the following steps:

SUMMARY STEPS 1. enable 2. configure terminal 3. vrf definition vrf-name 4. address-family ipv4 5. exit-address-family 6. address-family ipv6 7. exit-address-family

DETAILED STEPS

Command or Action Purpose Step 1 enable Enables privileged EXEC mode. Example: • Enter your password if prompted.

Router> enable

Step 2 configure terminal Enters global configuration mode. Example:

IPv6 over MPLS: 6PE and 6VPE 12 IPv6 over MPLS: 6PE and 6VPE Verifying IPv6 over MPLS: 6PE and 6VPE Configuration

Command or Action Purpose

Router# configure terminal

Step 3 vrf definition vrf-name Configures a VRF routing table instance and enters VRF configuration mode. Example: • vrf-name—Name assigned to a VRF. Router(config)# vrf definition red

Step 4 address-family ipv4 Enters address family configuration mode for configuring routing sessions that use standard IPv4 address prefixes. Example:

Router(config-vrf)# address-family ipv4

Step 5 exit-address-family Exits address-family submode. Example:

Router(config-vrf-af)# exit-address-family

Step 6 address-family ipv6 Enters address family configuration mode for configuring routing sessions that use standard IPv6 address prefixes. Example:

Router(config-vrf)# address-family ipv6

Step 7 exit-address-family Exits address-family submode. Example:

Router(config-vrf-af)# exit-address-family

Verifying IPv6 over MPLS: 6PE and 6VPE Configuration To verify the IPv6 over MPLS: 6PE and 6VPE configuration, use the show commands shown in the following examples. To display BGP entries from all of the customer-specific IPv6 routing tables, use the following show command.

Router# show bgp vpnv6 unicast all

Network Next Hop Metric LocPrf Weight Path Route Distinguisher: 100:1 * 2001:100:1:1000::/56 2001:100:1:1000::72a 0 0 200 ? * :: 0 32768 ? * i2001:100:1:2000::/56 ::FFFF:200.10.10.1 Route Distinguisher: 200:1 * 2001:100:2:1000::/56 :: 0 32768 ? * 2001:100:2:2000::/56 ::FFFF:200.10.10.1 0 32768 ? To display the parameters and the current state of the active IPv6 routing protocol processes, use the following show command:

Router# show ipv6 protocols vrf vpe_1

IPv6 over MPLS: 6PE and 6VPE 13 IPv6 over MPLS: 6PE and 6VPE Verifying IPv6 over MPLS: 6PE and 6VPE Configuration

IPv6 Routing Protocol is "connected" IPv6 Routing Protocol is "bgp 100" IGP synchronization is disabled Redistribution: None Neighbor(s): Address FiltIn FiltOut Weight RoutemapIn RoutemapOut 100::2 To display IPv6 router advertisement (RA) information received from on-link devices, use the following show command:

Router# show ipv6 route vrf vpe_1

IPv6 Routing Table - vpe_1 - 29 entries Codes: C - Connected, L - Local, S - Static, U - Per-user Static route B - BGP, R - RIP, H - NHRP, I1 - ISIS L1 I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary, D - EIGRP EX - EIGRP external, ND - ND Default, NDp - ND Prefix, DCE - Destination NDr - Redirect O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2 ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2 B 72::/64 [20/0] via 100::2 B 72:0:0:1::/64 [20/0] via 100::2 B 72:0:0:2::/64 [20/0] via 100::2 B 72:0:0:4::/64 [20/0] via 100::2 B 72:0:0:5::/64 [20/0] via 100::2 B 72:0:0:6::/64 [20/0] via 100::2 B 72:0:0:7::/64 [20/0] via 100::2 B 72:0:0:8::/64 [20/0] via 100::2 B 72:0:0:9::/64 [20/0] via 100::2 B 72:0:0:A::/64 [20/0] via 100::2 B 72:0:0:B::/64 [20/0] via 100::2 B 72:0:0:C::/64 [20/0] via 100::2 B 72:0:0:D::/64 [20/0] via 100::2 B 72:0:0:E::/64 [20/0] via 100::2 B 72:0:0:F::/64 [20/0] via 100::2 B 72:0:0:10::/64 [20/0] via 100::2 B 72:0:0:11::/64 [20/0] via 100::2 B 72:0:0:12::/64 [20/0] via 100::2 To display the Cisco Express Forwarding Forwarding Information Base (FIB) associated with an IPv6 Virtual Private Network (VPN) routing and forwarding (VRF) instance, use the following show command.

Router# show ipv6 cef vrf cisco1

IPv6 over MPLS: 6PE and 6VPE 14 IPv6 over MPLS: 6PE and 6VPE Verifying IPv6 over MPLS: 6PE and 6VPE Configuration

2001:8::/64 attached to GigabitEthernet0/0/1 2001:8::3/128 receive 2002:8::/64 nexthop 10.1.1.2 GigabitEthernet0/1/0 label 22 19 2010::/64 nexthop 2001:8::1 GigabitEthernet0/0/1 2012::/64 attached to Loopback1 2012::1/128 receive To display IPv6 routing table information associated with a VPN routing and forwarding (VRF) instance, use the following show command.

Router# show ipv6 route vrf

IPv6 Routing Table cisco1 - 6 entries Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP U - Per-user Static route I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2 C 2001:8::/64 [0/0] via ::, GigabitEthernet0/0/1 L 2001:8::3/128 [0/0] via ::, GigabitEthernet0/0/1 B 2002:8::/64 [200/0] via ::FFFF:192.168.1.4, B 2010::/64 [20/1] via 2001:8::1, C 2012::/64 [0/0] via ::, Loopback1 L 2012::1/128 [0/0] via ::, Loopback1 To display label forwarding information for advertised Virtual Private Network (VPN) routing and forwarding (VRF) instance routes, use the following show command.

Router# show mpls forwarding-table vrf vpe_1

Local Outgoing Prefix Bytes Label Outgoing Next Hop Label Label or Tunnel Id Switched interface 1760 No Label 72::/64[V] 0 Vl100 100::2 1761 No Label 72:0:0:1::/64[V] 0 Vl100 100::2 1762 No Label 72:0:0:2::/64[V] 0 Vl100 100::2 1764 No Label 72:0:0:3::/64[V] 0 Vl100 100::2 1765 No Label 72:0:0:4::/64[V] 0 Vl100 100::2 1768 No Label 72:0:0:7::/64[V] 0 Vl100 100::2 1769 No Label 72:0:0:8::/64[V] 0 Vl100 100::2 1770 No Label 72:0:0:9::/64[V] 0 Vl100 100::2 1771 No Label 72:0:0:A::/64[V] 0 Vl100 100::2 1772 No Label 72:0:0:B::/64[V] 0 Vl100 100::2 1773 No Label 72:0:0:C::/64[V] 0 Vl100 100::2 1774 No Label 72:0:0:D::/64[V] 0 Vl100 100::2 1775 No Label 72:0:0:E::/64[V] 0 Vl100 100::2 1776 No Label 72:0:0:F::/64[V] 0 Vl100 100::2 1777 No Label 72:0:0:10::/64[V] \ 0 Vl100 100::2 1778 No Label 72:0:0:11::/64[V] \ 0 Vl100 100::2 Local Outgoing Prefix Bytes Label Outgoing Next Hop

IPv6 over MPLS: 6PE and 6VPE 15 IPv6 over MPLS: 6PE and 6VPE Configuration Examples

Label Label or Tunnel Id Switched interface 1779 No Label 72:0:0:12::/64[V] \ 0 Vl100 100::2 1780 No Label 72:0:0:13::/64[V] \ 0 Vl100 100::2 1781 No Label 72:0:0:14::/64[V] \ 0 Vl100 100::2 1782 No Label 72:0:0:15::/64[V] \ 0 Vl100 100::2 1783 No Label 72:0:0:16::/64[V] \ 0 Vl100 100::2 1784 No Label 72:0:0:17::/64[V] \ 0 Vl100 100::2 1785 No Label 72:0:0:18::/64[V] \ 0 Vl100 100::2 To display output information linking the MPLS label with prefixes, use the following show command.

Router# show mpls forwarding-table

Local Outgoing Prefix Bytes tag Outgoing Next Hop tag tag or VC or Tunnel Id switched interface 16 Aggregate IPv6 0 17 Aggregate IPv6 0 18 Aggregate IPv6 0 19 Pop tag 192.168.99.64/30 0 GE0/0 point2point 20 Pop tag 192.168.99.70/32 0 GE0/0 point2point 21 Pop tag 192.168.99.200/32 0 GE0/0 point2point 22 Aggregate IPv6 5424 23 Aggregate IPv6 3576 24 Aggregate IPv6 2600 To display entries in the IPv6 BGP routing table, use the following show command:

Router# show bgp ipv6 2001:33::/64

BGP routing table entry for 2001:33::/64, version 3 Paths: (1 available, best #1, table Global-IPv6-Table) Not advertised to any peer Local ::FFFF:192.168.0.2 (metric 30) from 192.168.0.2 (192.168.0.2) Origin IGP, localpref 100, valid, internal, best

Configuration Examples This section provides sample configuration examples for IPv6 over MPLS: 6PE and 6VPE feature on the router.

Example: Configuring 6PE The following is a sample configuration of 6PE.

interface GigabitEthernet0/3/0/0 ipv6 address 2001::1/64 ! router isis ipv6-cloud net 49.0000.0000.0001.00 address-family ipv6 unicast

IPv6 over MPLS: 6PE and 6VPE 16 IPv6 over MPLS: 6PE and 6VPE Example: Configuring 6VPE

single-topology interface GigabitEthernet0/3/0/0 address-family ipv6 unicast ! ! router bgp 55400 bgp router-id 54.6.1.1 address-family ipv4 unicast ! address-family ipv6 unicast network 55:5::/64 redistribute connected redistribute isis ipv6-cloud allocate-label all ! neighbor 34.4.3.3 remote-as 55400 address-family ipv4 unicast ! address-family ipv6 labeled-unicast

Example: Configuring 6VPE The following is a sample configuration of 6VPE.

vrf vpn1 address-family ipv6 unicast import route-target 200:2 ! export route-target 200:2 interface Loopback0 ipv4 address 10.0.0.1 255.255.255.255 interface GigabitEthernet0/0/0/1 vrf vpn1 ipv6 address 2001:c003:a::2/64 router bgp 1 bgp router-id 10.0.0.1 bgp redistribute-internal bgp graceful-restart address-family ipv4 unicast ! address-family vpnv6 unicast ! neighbor 10.0.0.2 >>>> Remote peer loopback address. remote-as 1 update-source Loopback0 address-family ipv4 unicast ! address-family vpnv6 unicast route-policy pass-all in route-policy pass-all out ! vrf vpn1 rd 100:2 bgp router-id 140.140.140.140 address-family ipv6 unicast redistribute connected ! neighbor 2001:c003:a::1 remote-as 6502

IPv6 over MPLS: 6PE and 6VPE 17 IPv6 over MPLS: 6PE and 6VPE Additional References

address-family ipv6 unicast route-policy pass-all in route-policy pass-all out

Additional References The following sections provide references related to IPv6 over MPLS: 6PE and 6VPE feature.