Configuring Vrf-Lite For Ipv4 - Cisco Catalyst 4500 Series Software Configuration Manual

Configuring VRF-lite for IPv4

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IPv4 Specific
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IPv6 specific
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Configuring VRF-lite for IPv4
Configuring VRFs
To configure one or more VRFs, perform this task:
Command
Switch# configure terminal
Step 1
Switch(config)# ip routing
Step 2
Switch(config)# ip vrf vrf-name
Step 3
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
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A Catalyst 4500 series switch using VRF can support one global network and up to 64 VRFs. The
total number of routes supported is limited by the size of the TCAM.
A single VRF can be configured for both IPv4 and IPv6.
PBR and VRF cannot be configured on the same interface. Similarly, WCCP, Etherchannel and MEC
cannot be configured on the same interface with VRF.
If an incoming packet's destination address is not found in the vrf table, the packet is dropped. Also,
if insufficient TCAM space exists for a VRF route, hardware switching for that VRF is disabled and
the corresponding data packets are sent to software for processing.
You can use most routing protocols (BGP, OSPF, EIGRP, RIP and static routing) between the CE
and the PE. However, we recommend using external BGP (EBGP) for these reasons:
– BGP does not require multiple algorithms to communicate with multiple CEs.
– BGP is designed for passing routing information between systems run by different
administrations.
– BGP makes simplifies passing attributes of the routes to the CE.
VRF-lite does not support IGRP and ISIS.
Beginning with Cisco IOS Release 12.2(50)SG, Multicast and VRF can be configured together on a
Layer 3 interface.
The Catalyst 4500 series switch supports all the PIM protocols (PIM-SM, PIM-DM, PIM-SSM, PIM
BiDIR).
The capability vrf-lite subcommand under router ospf should be used when configuring OSPF as
the routing protocol between the PE and the CE.
VRF-aware OSPFv3, BGPv6, EIGRPv6, and IPv6 static routing are supported.
VRF aware ISISv6, RIPng, IPv6 Multicast Routing(MVRF), and PIMv6 are not supported.
VRF-aware IPv6 route applications include: ping, telnet, ssh, tftp, ftp and traceroute. (This list does
not include the Mgt interface, which is handled differently even though you can configure both IPv4
or IPv6 VRF under it.)
Purpose
Enters global configuration mode.
Enables IP routing.
Names the VRF and enters VRF configuration mode.
Chapter 43 Configuring VRF-lite