The independent routing instances allow users to deploy IP internet protocol addresses that overlap or are the same without conflict. Because users may segment network paths without multiple routers, network functionality improves—one of the key benefits of virtual routing and forwarding. Virtual routing and forwarding VRF IP technology allows users to configure multiple routing table instances to simultaneously co-exist within the same router. Overlapping IP addresses can be used without conflicting because the multiple routing instances are independent, and can select different outgoing interfaces.
Typically, users implement VRFs primarily to segregate network traffic and more efficiently use network routers. Virtual routing and forwarding can also create VPN tunnels to be solely dedicated to a single network or client. Here are the basic differences. VRF lite is generally used in the office LAN or data center environment to virtualize various security zones and network elements. There are several key terms to define in the context of virtual routing and forwarding, and a few comparisons to make, because they answer common questions.
Here they are:. A virtual private network referred to as VPN is a network that provides private services over a public infrastructure. Sets of sites that privately communicate together over other private or public networks over the internet are virtual private networks VPNs. Virtual routing and forwarding or VRF configurations enable multiple VPN environments to simultaneously co-exist in a router on the same physical network or infrastructure. This allows an organization to have segregated network services that reside in the same physical infrastructure invisible to each other—such as wireless, voice VoIP , data, and video.
Identifies the name of the VRF instance that will be associated with the next two commands, and opens VRF address-family mode. Router config-router-af neighbor Informs this router's BGP neighbor table of the neighbor's address or peer group name and the neighbor's autonomous system number. Because you are using BGP, continue on with the next section's procedure. Had you used another routing protocol, you would not need to implement the next section— nor of course the current section either.
Doing so consists of two operations:. Opens interface configuration mode for the interface to be used for the BGP session. You can save the configuration by entering the copy running-config startup-config command. If you need to delete the BGP routing process, use the no router bgp autonomous-system-number global configuration command.
However, if you want to delete only particular routing characteristics, enter the router bgp global configuration command, followed by the no form of the particular router configuration command which governs that characteristic. The Cisco Technical Support website contains thousands of pages of searchable technical content, including links to products, technologies, solutions, technical tips, and tools.
Registered Cisco. Command or Action. Enter configuration commands, one per line. Router config-router-af redistribute ospf 2 match internal. Router config-router-af redistribute ospf 1 match internal. Related Topic. The feature was integrated into the No import maps, export maps, or route maps are defined.
The default for an interface is the global routing table. Enables privileged EXEC mode. Note: This command is effective only if BGP is running. Optional Associates a route map with the VRF. Associates the VRF with the Layer 3 interface. Optional Logs changes in the adjacency state. This is the default state.
0コメント