Hi, As you mention we already have > other community out there which you need to trust to act on them, > being it NO_EXPORT / NO_ADVERTISE, BLACKHOLE (usally filtered against > a prefix-list), or any advisory community from IXPs and ISPs. >
But most if not all of those do not affect intradomain traffic engineering rules. So I think Jeff's point is how much trust is needed to overwrite your own policy in selecting exit points and overwriting your EPE policy, TE policy, Local Pref etc ... And I think misuse of those can happen even over direct peerings if the overall objective is to avoid double checking the community against prefix lists. Thx, R.
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