Administrator Guide

Layer 3 Routing Commands 1334
Example
console(config-router)#redistribute rip
rd
Use the rd command to configure a BGP routing session to advertise VPN-
IPv4 prefixes. Use the no form of this command to delete the VPN-IPv4
configuration.
Syntax
rd route-distinguisher
no rd
route-distinguisher— A 2-byte or an 8-byte value to be prepended to an IPv4
prefix to create a VPN IPv4 prefix. The RD value can be specified in either of
the following formats:
• 16-bit AS number: a 32-bit value (Ex : 100:11)
• 32-bit IPv4 address: a 16-bit value (Ex : 10.1.1.1:22)
Default Configuration
VRG configuration mode
Command Mode
Privileged Exec mode
User Guidelines
An RD creates routing and forwarding table instance and specifies the default
route distinguisher for a VPN. The RD is prepended to IPv4 prefixes to
change them into globally unique VPN-IPv4 prefixes.
An RD is either:
• ASN related – Composed of an autonomous system number and an
arbitrary number.
• IP address related – Composed of an IP address and an arbitrary number.
Once an RD has been configured, it may not be reconfigured. Use the no
form of the command to remove the RD before configuring a new RD value.