Chris,

On Wed, Mar 28, 2012 at 12:45:22PM -0400, Christopher Morrow wrote:
> ah yes, was thinking of local-as. the 'replace-as' seems like
> loop-creation, joy.

It can.  The use of replace-as is typically in situations where you need to
replace private AS numbers with a public number. This is typically done when
you have deployments that have a mix of private and public ASes behind a
common transit carrier and "remove-private" isn't sufficient.

The required behavior in order to avoid problems here is to make sure that
the set of ASes involved are behind that common carrier and either are not
multi-homed to the wider Internet (unlikely since they have private ASes) or
are applying appropriate AS filtering to manually suppress loops.

-- Jeff
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