HP 6125XLG R2306-HP 6125XLG Blade Switch MCE Configuration Guide - Page 6
Route target attributes, MCE, VPN-IPv4 address structure
View all HP 6125XLG manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 6 highlights
Figure 2 VPN-IPv4 address structure The MCE device does not support advertising VPN routes through MP-BGP. However, to run BGP VPN instances on the MCE device, you must configure a unique RD for each VPN instance to distinguish between the VPN instances. An RD can be in one of the following formats distinguished by a 2-byte Type field: • When the value of the Type field is 0, the Administrator subfield occupies two bytes, the Assigned number subfield occupies four bytes, and the RD format is 16-bit AS number:32-bit user-defined number. For example, 100:1. • When the value of the Type field is 1, the Administrator subfield occupies four bytes, the Assigned number subfield occupies two bytes, and the RD format is 32-bit IPv4 address:16-bit user-defined number. For example, 172.1.1.1:1. • When the value of the Type field is 2, the Administrator subfield occupies four bytes, the Assigned number subfield occupies two bytes, and the RD format is 32-bit AS number:16-bit user-defined number, where the minimum value of the AS number is 65536. For example, 65536:1. To guarantee global uniqueness for an RD, do not set the Administrator subfield to any private AS number or private IP address. Route target attributes MPLS L3VPN uses the BGP extended community attributes called route target attributes or route target attributes, to control the advertisement of VPN routing information. A VPN instance on a PE supports the following types of route target attributes: • Export target attribute-A PE sets the export attribute for VPN-IPv4 routes learned from directly connected sites before advertising them to other PEs. • Import target attribute-A PE checks the export target attribute of VPN-IPv4 routes received from other PEs. If the export target attribute matches the import target attribute of the VPN instance, the PE adds the routes to the VPN routing table. In other words, route target attributes define which sites can receive a VPN-IPv4 route, and from which sites that a PE can receive routes. Similar to RDs, route target attributes can be one of the following formats: • 16-bit AS number:32-bit user-defined number. For example, 100:1. • 32-bit IPv4 address:16-bit user-defined number. For example, 172.1.1.1:1. • 32-bit AS number:16-bit user-defined number, where the minimum value of the AS number is 65536. For example, 65536:1. MCE BGP/MPLS VPN transmits private network data through MPLS tunnels over the public network. However, the traditional MPLS L3VPN architecture requires each VPN instance use an exclusive CE to connect to a PE, as shown in Figure 1. 3