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Advertise /24 to peer B when /32 with given community accepted from peer A (looking for hints in building import/export filters)

  • 1.  Advertise /24 to peer B when /32 with given community accepted from peer A (looking for hints in building import/export filters)

    This message was posted by a user wishing to remain anonymous
    Posted 20 days ago
    This message was posted by a user wishing to remain anonymous

    >Hi.
    I'm struggling with creating proper import/export filters for BGP peers on my Juniper MX router.

    I have a BGP session with peer A (flow collector, detecting ddos attacks) - and when it detects a large DDoS, it announces to my router the attacked prefix ipv4 /32 with the needed  community (say: 65530:999). The /32 accepted from peer A may be part of any of my /24 prefixes, stated on a prefix list called.. MY-PREFIX-LIST ;)
    And so far: I've got it covered, the route to the /32 announced by peer A is installed in the MXa table.
    In turn, to peer B - in such a situation I have to announce the whole prefix /24 to which the above /32 belongs.
    Will be grateful for any smart hints :)