How many route-target supported.

Unanswered Question
Sep 10th, 2012

                  when i config route-target import or export , is there any limitation on maximum numbers of route-target.

                  i heard it is 64 on cisco ios, when i config more than 64 route target ,is there any problem?

I have this problem too.
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Giuseppe Larosa Mon, 09/10/2012 - 02:55

Hello Fly,

in real world there is no reasons to have so many route-targets configured for import or export in a single VRF.

MPLS command reference does not report a limit in the number of statements see

http://www.cisco.com/en/US/docs/ios-xml/ios/mpls/command/mp-m4.html#GUID-C8F33D6B-F2A4-4D94-84E0-E8DF4A54DB32

For example instead of importing 50 route-targets is more appropriate to have those other 50 VRFs to export with an additional route-target and then to have a single VRF import in the VRF that should receive the routes using that specific additional route-target.

There is also the capability to use export-map and import-map to invoke route-maps in order to perform more granular import or export.

export map see

http://www.cisco.com/en/US/docs/ios-xml/ios/mpls/command/mp-e1.html#GUID-AE6BB1C6-A6AA-49C0-AA0A-A3E0C119C91A

import map

http://www.cisco.com/en/US/docs/ios-xml/ios/mpls/command/mp-e1.html#GUID-55EBAEFD-AB10-4FEA-8C9B-F6CA34CDBB12

Hope to help

Giuseppe

alessio@cisco Mon, 09/10/2012 - 03:37

Hi All,

Giuseppe is right. The limit is not 32 VRF per ASR1000. I probably misread a documentation that i will post soon.

Sorry for the incorrect information

Alessio

alessio@cisco Mon, 09/10/2012 - 02:45

Hi Fly,

i would say that the limit to consider is not on RT number but on the VRF max number. Even supposing you need to implement centralised sevices, it is going to be very challenging for any platform to manage so many RT per VRF on a single router. Please post your design so to beter answer to your question. By the way, don't forget that configuring so many RT on a single platform is never a good idea for the single point of failure issues before than for the router performances.

Hope this helps

Alessio

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Posted September 10, 2012 at 2:26 AM
By fly
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