Specifications

rd
MP-403
Cisco IOS Multiprotocol Label Switching Command Reference
January 2010
rd
To specify a route distinguisher (RD) for a VPN routing and forwarding (VRF) instance, use the rd
command in VRF configuration submode.
rd r
oute-distinguisher
Syntax Description
Command Default There is no default. An RD must be configured for a VRF to be functional.
Command Modes VRF configuration submode
Command History
Usage Guidelines An RD creates routing and forwarding tables and specifies the default route distinguisher for a VPN. The
RD
is added to the beginning of the customer’s 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.
You can enter an RD in either of these formats:
16-bit autonomous-system-number:yo
ur 32-bit number
For example, 101:3.
32-bit IP address:yo
ur 16-bit number
For example, 192.168.122.15:1.
route-distinguisher Adds an 8-byte value to an IPv4 prefix to create a VPN IPv4 prefix.
Release Modification
12.0(5)T This command was introduced.
12.0(21)ST This command was integrated into Cisco IOS 12.0(21)ST.
12.0(22)S This command was integrated into Cisco IOS 12.0(22)S.
12.2(13)T This command was integrated into Cisco IOS 12.2(13)T.
12.2(14)S This command was integrated into Cisco IOS 12.2(14)S.
12.2(28)SB This command was integrated into Cisco IOS Release 12.2(28)SB.
12.2(33)SRA This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(33)SRB Support for IPv6 was added.
12.2(33)SXH This command was integrated into Cisco IOS Release 12.2(33)SXH.
12.2(33)SB This command was integrated into Cisco IOS Release 12.2(33)SB.