Cisco Systems 3560 사용자 설명서

To configure VRF, you create a VRF table and specify the Layer 3 interface associated with the VRF. 
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 provider’s backbone. The 
multi-VRF CE network has three major components:

VPN route target communities—lists of 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.

 shows the default VRF configuration.

To use multi-VRF CE, you must have the IP services image installed on your switch.

These are considerations when configuring VRF in your network:

A switch with multi-VRF CE is shared by multiple customers, and each customer has its own routing 
table.

Because customers use different VRF tables, the same IP addresses can be re-used. Overlapped IP 
addresses are allowed in different VPNs.

Multi-VRF CE lets multiple customers share the same physical link between the provider edge (PE) 
and the customer edge (CE). Trunk ports with multiple VLANs separate packets among customers. 
Each customer has its own VLAN.

Multi-VRF CE does not support all MPLS-VRF functionality. It does not support label exchange, 
LDP adjacency, or labeled packets.

For the PE router, there is no difference between using multi-VRF CE or using multiple CEs. In 

, multiple virtual Layer 3 interfaces are connected to the multi-VRF CE device.

The switch supports configuring VRF by using physical ports, VLAN SVIs, or a combination of 
both. The SVIs can be connected through an access port or a trunk port.

VRF

Disabled. No VRFs are defined.

Maps

No import maps, export maps, or route maps are defined.

VRF maximum routes

Fast Ethernet switches: 8000.

 

Gigabit Ethernet switches: 12000.

Forwarding table

The default for an interface is the global routing table.