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Configure VRF-lite | Page 3
Introduction
Contents
Introduction .............................................................................................................................................................................1
What is VRF-lite? .........................................................................................................................................................1
Who should read this document? .....................................................................................................................2
Which products and software version does it apply to?......................................................................2
Software feature licenses........................................................................................................................................2
Command summary .................................................................................................................................................2
Glossary.....................................................................................................................................................................................3
Understanding VRF-lite .....................................................................................................................................................4
VRF-lite security domains.......................................................................................................................................5
Route table and interface management with VRF-lite...........................................................................5
Inter-VRF communication.......................................................................................................................................7
Static and dynamic inter-VRF routing...............................................................................................................8
VRF-lite features in AW+.......................................................................................................................................9
Route limiting per VRF instance.......................................................................................................................10
VRF-aware utilities within AW+......................................................................................................................10
Configuring VRF-lite.........................................................................................................................................................12
Static inter-VRF routing.........................................................................................................................................16
Dynamic inter-VRF communication explained..................................................................................................17
The Forwarding Information Base (FIB) and routing protocols.....................................................17
Inter-VRF communication via BGP.................................................................................................................19
How VRF-lite security is maintained .............................................................................................................23
Simple VRF-lite configuration examples...............................................................................................................24
Multiple VRFs without inter-VRF communication.................................................................................. 24
Dynamic inter-VRF communication with RIP routing to external peers..................................27
Dynamic inter-VRF communication with BGP routing to external peers ...............................28
Dynamic inter-VRF communication with OSPF routing to external peers ............................29
Inter-VRF configuration examples with Internet access ..............................................................................32
Configuring a complex inter-VRF solution ..........................................................................................................43
Network description..............................................................................................................................................43
Configuration breakdown ...................................................................................................................................45
VCStack and VRF-lite ......................................................................................................................................................70
Sharing VRF routing and double tagging on the same port ............................................................74
Dynamic inter-VRF routing between the global VRF domain and a VRF instance......................77
BGP configuration tips...........................................................................................................................................78
Dynamic inter-VRF communication with i-BGP routing to external peer...............................80
Dynamic inter-VRF communication with e-BGP routing to external peer.............................81
Route Limits..........................................................................................................................................................................83
Configuring static route limits ...........................................................................................................................83
Configuring Dynamic route limits...................................................................................................................84
VRF-lite usage guidelines ...............................................................................................................................................86
Useful VRF-related diagnostics command list ...................................................................................................87