Dynamic inter-VRF communication explained

How VRF-lite security is maintained

Incidentally, only the original routes can be copied from one VRF to another. Copied routes cannot be subsequently copied to another VRF, to ensure VRF security domains are enforced.

For example:

VRFred----VRFshared----VRFgreen

If VRF red routes are copied into the route table of VRF shared, VRF red routes will not be able to subsequently be copied from VRF shared into the VRF green route table. This ensures that while VRF green, and VRF red can access VRF shared, there is no inter-VRF communication between VRF red and VRF green - unless additional route leakage is configured.

Similarly, routes learnt by the default global VRF domain from a VRF instance via internal BGP peering cannot be subsequently advertised from the default global VRF domain to another VRF instance.

VRFred---default_global_VRF---VRFgreen

Viewing source VRF and attribute information for a prefix

The command show ip bgp < prefix> can be used to display source VRF and extended community attribute information for a route.

For example:

VRF_device#show ip bgp 192.168.120.0

[VRF: green]

BGP routing table entry for 192.168.120.0/24

Paths: (1 available, best #1, table Default-IP-Routing-Table) Not advertised to any peer

192.168.20.1 from 192.168.20.10 (192.168.20.10)

Origin IGP metric 0, localpref 100, valid, external, best

Extended Community: RT:500:2

Last update: Thu Nov 18 03:51:06 2010

[VRF: common]

BGP routing table entry for 192.168.120.0/24

Paths: (1 available, best #1, table Default-IP-Routing-Table) Not advertised to any peer

192.168.20.1 from 192.168.20.10 (192.168.20.10)

Origin IGP metric 0, localpref 100, valid, external, best

Extended Community: RT:500:2

Copied from VRF: green

Last update: Thu Nov 18 03:51:06 2010

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Allied Telesis C613-16164-00 REV E manual How VRF-lite security is maintained

C613-16164-00 REV E specifications

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