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

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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

Page 24 Configure VRF-lite

Image 24
Contents How To Configure VRF-lite Introduction What is VRF-lite?Software feature licenses Command summaryWho should read this document? Which products and software version does it apply to?Contents Glossary VRFUnderstanding VRF-lite VRF-lite security domains Route table and interface management with VRF-liteInterface management with VRF Vlan5Route management with VRF Adding a VRF-aware static ARPInter-VRF communication Static and dynamic inter-VRF routing VRF-lite features in AW+ For exampleVRF aware services include Route limiting per VRF instanceVRF-aware utilities within AW+  Ping Telnet client  SSH client TCP dump Configuring VRF-lite Awplusconfig# access-list standardAwplusconfig-if#switchportaccess vlanx Family Awplusconfig-route-map#match ip Static inter-VRF routing Ip route 192.168.50.0/24 Ip route vrf green 192.168.1.0/24Dynamic inter-VRF communication explained Forwarding Information Base FIB and routing protocolsBGP Inter-VRF communication via BGP Using the route-target command Route-target import ASNVRFinstance For exampleRoute-target both ASNVRFinstance For example Can be replaced withAlso, if VRF shared configuration includes If VRF red initially includesIf VRF shared initially includes Via BGP IVR, VRF shared will end up with the routesIf VRF shared configuration includes Then via BGP IVR, VRF red will end up with the routesHow VRF-lite security is maintained Viewing source VRF and attribute information for a prefixSimple VRF-lite configuration examples Multiple VRFs without inter-VRF communication26 Configure VRF-lite Vlan 28 Configure VRF-lite Configure VRF-lite 30 Configure VRF-lite Configure VRF-lite 32 Configure VRF-lite Inter-VRF configuration examples with Internet access Configuration Configure VRF-lite Example B Configuration 38 Configure VRF-lite Configure VRF-lite Example C Configuration 42 Configure VRF-lite Configure VRF-lite Configuring a complex inter-VRF solution Network description Each VLANs is associated with a VRF instance VRF communication plan Configuration breakdown Configure VRF-lite Configure Vrfs Configure the hardware ACLs This example, three access groups are attached to port Within the same IP subnet that the switch port is a member192.168.43.0/24 via the shared VRF Configure Vlan Database Configure IP Addresses Configure VRF-lite Configure Dynamic Routing Configure VRF-lite 56 Configure VRF-lite Configure Static Routing Complete show run output from VRF device is below Configure VRF-lite 60 Configure VRF-lite Configure VRF-lite IP route table from VRF device is below VRF blue Hostname Internetrouter Hostname sharedrouter Hostname redospfpeer N1 Ospf NssaHostname greeniBGPpeer Hostname bluerippeer Hostname orangerouter Hostname orangeospfpeer Other features used in this configuration VCStack and VRF-liteStack provisioning GreyX610 VCStack configuration Virtual Chassis IDX900 configuration 74 Configure VRF-lite Sharing VRF routing and double tagging on the same port Communication planGreen PortConfigurations X610 aX610 B Configure VRF-lite Additional notes BGP configuration tips 80 Configure VRF-lite VRF device Red router vlan database Red router Configuring static route limits Route LimitsConfiguring Dynamic route limits Allowed number of fib routes excluding Connect and Static100 No max-fib-routes SyntaxVRF-lite usage guidelines Useful VRF-related diagnostics command list GeneralRouting general Routing protocols IP prefix network, e.g HW platform table commands TCPdump

C613-16164-00 REV E specifications

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