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Ran 11 Feb 2017 01:20PM UTC

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Committed 11 Feb 2017 05:59AM UTC coverage: 67.875% (+0.02%) from 67.854%

Job # TOX_ENV=py27

Build Type

push

travis-ci

Committed by

fujita

Commit Message

allow_local_as_in_count : allow local ASN in AS patch, e.g. "rd auto/route-target both auto"

Cisco/Juniper/Cumulus and undoubtedly more vendors offer a
simplification of the EVPN configuration by not having to
specify individual RD/RT's, e.g. in Cisco NX-OS syntax:

evpn
    vni 10311 l2
      rd auto
      route-target import auto
      route-target export auto

This simplifies/unifies the configuration.
All leaf switches/ryu instances share the same ASN (e.g. 65511).
Spine switches in the same layer can share an ASN as well (e.g. 65510).

To facilitate the above, the local ASN has to be accepted in the AS path.
To this end, Cisco includes an 'allowas-in' configuration statement.
See:
http://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/guide-c07-734107.html
search for "MP-eBGP Design with VTEP Leaf Nodes in the Same BGP
Autonomous System"

This patch offers the possibility to specify the number of accepted
occurrences
of the local ASN in incoming AS paths. The default value is 0, which basically
is the same as the code before this patch: local ASN in the path
indicates a loop.
Non-zero values allow the local ASN to appear the specified number of times in
the AS path. A maximum value of 3 should satisfy most deployments.

Signed-off-by: Albert Siersema <albert@mediacaster.nl>

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