Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide
Chapter 2 BGP/MPLS VPN Configuration
Commands
3Com Corporation
2-19
BGP-VPNv4 subaddress family view
Parameter
None
Description
Use the policy vpn-target command to filter the received routing information
according to the VPN-target extended community attributes.
Use the undo policy vpn-target command to remove the filtering.
By default, the received routing information is filtered according to the VPN-target
extended community attributes.
Example
# Filter the received routing information according to the VPN-target extended
community attributes.
[3Com -bgp-af-vpn] policy vpn-target
2.1.23 route-distinguisher
Syntax
route-distinguisher route-distinguisher
View
MBGP VPN-instance view
Parameter
route-distinguisher: Configures a VPN IPv4 prefix by adding an 8-byte value to an IPv4
prefix.
Description
Use the route-distinguisher command to configure RD for an MPLS VPN instance. A
vpn-instance cannot run until it is configured with an RD.
A route distinguisher (RD) creates route and forwarding list for a VPN and specifies the
default route identifier. Add an RD to the beginning of a specific IPv4 prefix to make it
the globally unique VPN IPv4 prefix.
If an RD is associated with an autonomous system number (ASN), it is composed of the
ASN and an arbitrary number; if the RD is associated with an IP address, it is a
combination of the IP address and an arbitrary number.
RD has the following formats:
16-bit ASN (can be 0 here): a 32-bit number defined by user, for example, 101:3.