Specifications

ip vrf forwarding (interface configuration)
MP-119
Cisco IOS Multiprotocol Label Switching Command Reference
January 2010
ip vrf forwarding (interface configuration)
To associate a Virtual Private Network (VPN) routing and forwarding (VRF) instance with an interface
or subinterface, use the ip vrf forwarding command in interface configuration mode. To disassociate a
VRF, use the no form of this command.
ip vrf forwarding vr
f-name [downstream vrf-name2]
no ip vrf forwarding vr
f-name [downstream vrf-name2]
Syntax Description
Defaults The default for an interface is the global routing table.
Command Modes Interface configuration
Command History
Usage Guidelines Use this command to associate an interface with a VRF. Executing this command on an interface
re
moves the IP address. The IP address should be reconfigured. The downstream keyword is available
on supported platforms with virtual interfaces. The downstream keyword associates the interfaces with
a downstream VRF, which enables half duplex VRF functionality on the interface. Some functions
operate in the upstream VRFs, and others operate in the downstream VRFs. The following functions
operate in the downstream VRFs:
– PPP peer routes are installed in the downstream VRFs.
– Authentication, authorization, and accounting (AAA) per-user routes are installed in the
downstream VRFs.
vrf-name Associates the interface with the specified VRF.
downstream (Optional) Enables Half Duplex VRF (HDVRF) functionality on the
i
nterface and associates the interface with the downstream VRF.
vrf-name2 (Optional) Associates the interface with the specified downstream
VR
F.
Release Modification
12.0(5)T This command was introduced.
12.3(6) The do
wnstream keyword was added to support MPLS VPN Half-Duplex
VRFs.
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.
12.2SX This command is supported in the Cisco IOS Release 12.2SX train. Support in
a
specific 12.2SX release of this train depends on your feature set, platform,
and platform hardware.
Cisco IOS XE
R
elease 2.5
This command was modified. This command was implemented on the
Cisco ASR 1000 Series Aggregation Services Routers.