Route Distinguisher. Represents a route distinguisher scoped to a route distinguisher group. A route distinguisher is added to the beginning of the customer's IP prefixes to change them into globally unique VPN-IP prefixes. A route distinguisher is made up of two values, the administrative value and the assigned value, which compiled make up
Nov 15, 2016 · A VPN-IPv4 address is a 12-byte quantity, which consists of an 8-byte Route Distinguisher (RD), and a 4-byte IPv4 address. Basically, an IPv4 address can be converted into an VPN-IPv4 address by appending a RD. The RD field indicates that the Route Distinguisher is configured under the BGP/MPLS VPN and is set to this value when the PE announces a Type 1 route. The field “Originating Router IP Address” is always set to the IPv4 loopback address of the originating PE router. Sep 12, 2019 · The VPN distinguisher for the route is retained so that the network administrator can configure the correct inbound policy to translate the VPN distinguisher to the RTs that the VPN route should carry. If the route is sent to eBGP peers, the VPN distinguisher is carried as is. Sep 12, 2019 · The VPN distinguisher for the route is retained so that the network administrator can configure the correct inbound policy to translate the VPN distinguisher to the RTs that the VPN route should carry. If the route is sent to eBGP peers, the VPN distinguisher is carried as is. Understanding IPv4 Route Distribution in a Layer 3 VPN, Understanding VPN-IPv4 Addresses and Route Distinguishers Apr 20, 2019 · To allow a PE to determine to which VPN instance a route belongs, run the route-distinguisher command to configure an RD for an address family of a VPN instance on the PE. After the configuration, the PE will add an RD to the route received from the VPN instance, and then the route prefix becomes a globally unique VPN IPv4 or IPv6 route RD (Route Distinguisher) To fix this issue, we will use a RD (Route Distinguisher). We will add something to the prefix of the customer so that it will become unique: The RD is a 8 byte (64 bit) field.
Apr 20, 2019
As its name implies, a route distinguisher (RD) distinguishes one set of routes (one VRF) from another. It is a unique number prepended to each route within a VRF to identify it as belonging to that particular VRF or customer. An RD is carried along with a route via MP-BGP when exchanging VPN routes with other PE routers. Route Target Let’s see what routes we have in our vpn-R2 VRF. root@j40> show route table vpn-R2.inet.0 vpn-R2.inet.0: 5 destinations, 5 routes (5 active, 0 holddown, 0 hidden) + = Active Route, - = Last Active, * = Both 22.214.171.124/24 *[BGP/170] 01:32:17, localpref 100, from 10.1.1.7 AS path: I > to 126.96.36.199 via ge-0/0/1.0, label-switched-path j40-to-j35 to route-distinguisher 13:13 ip vpn-instance 24 route-distinguisher 24:24
IP Routing: BGP Configuration Guide - BGP-VPN
Sep 12, 2019 Solved: Real Purpose of Route-Distinguishers - Cisco Community Creates new BGP paths with a route-distinguisher that is equal to the route-distinguisher configured from the VRF that is being processed. All the routes are now compared and at this point, the BGP route selection process is executed. CCIE Blog » Blog Archive » Difference between the RD and RT The Route-Distinguisher (RD) & Route-Target (RT) are two different concepts that are both used in an MPLS VPN. The RD is used to keep all prefixes in the BGP table unique, and the RT is used to transfer routes between VRF’s/VPNS. Let’s take a look at an example. In the diagram below, the orange = customer A, and the red = customer B. IP Routing: BGP Configuration Guide, Cisco IOS Release 15M Sep 12, 2019