Cisco 10000 - Manual (Page 144)

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Cisco 10000 Series Router Software Configuration Guide
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Chapter 4 Configuring Multiprotocol Label Switching
IPv6 VPN over MPLS
• Model 2: Some VPNs may obtain Internet access via an VRF interface.
If a packet is received by a PE over a VRF interface and the packet's destination address does not
match any route in the VRF, the packet can be matched against the PE's default forwarding table. If
the packet matches the PE’s default forwarding table, the packet can be forwarded natively through
the backbone to the Internet instead of being forwarded by MPLS. In this model, the default
forwarding table might have the full set of Internet routes, or it might have just a single default route
leading to another router that does have the full set of Internet routes in its default forwarding table.
• Model 3: Using static routes in VRF that can be resolved using the IPv6 Global Table.
The static routes in VRFs can be resolved in the IPv6 Global Table in the same way they are
currently supported for IPv4 VPN. Therefore, in the IPv6 VRF, the network administrator can add
static routes as a default route, that points to an IPv6 Internet Gateway for outbound traffic from CE
to Internet.
• Model 4: All Internet routes in VRF.
You can obtain Internet access via a VRF interface by having the VRF include the Internet routes.
This model involves redistributing the Internet routes into the VRF.
VRF-Aware Router Applications
The following features are supported on Cisco 10000 series routers by the IPv6VPN over MPLS (6VPE)
feature:
• VRF-aware Ping
The VRF-aware Ping ping vrf [VRF name] [IPv6-address] command is supported.
• VRF-aware Traceroute
The VRF-aware Traceroute traceroute vrf [VRF name] [IPv6-address] command is supported.
• VRF-aware Telnet
The VRF-aware Telnet telnet vrf [VRF name] [IPv6-address] command is supported.
VRF-Lite
VRF-lite, also known as Multi-VRF CE, is an extension of IP routing with multiple routing instances on
a CE router. The VRF-lite feature performs the following functions:
• Enables the creation of a Layer 3 VPN service by keeping separate IP routing and forwarding tables
for each VPN customer.
• Uses input interfaces to distinguish routes for different VPNs.
• Forms virtual packet-forwarding tables by associating one or more interfaces with each VRF. An
interface cannot belong to more than one VRF at any time.
• Supports overlapping unicast IP addresses across different VRFs.
VRF-lite is typically deployed along with Multiprotocol Label Switching (MPLS) VPN at the customer
edge to support multiple customers on a single switch. The 6VPE feature supports the VRF-Lite feature
in the same way as the feature is currently supported by IPv4 VPNs.
QoS Features
The following features are supported on Cisco 10000 series routers by the IPv6VPN over MPLS (6VPE)
feature: