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Cisco Bug: CSCuq79862 - Administrative distance of LISP away-routes and AM routes clash

Last Modified

Sep 09, 2019

Products (8)

  • Cisco Nexus 7000 Series Switches
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco Nexus 7000 4-Slot Switch
  • Cisco Nexus 7700 6-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7700 18-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch
  • Cisco Nexus 7700 10-Slot Switch

Known Affected Releases


Description (partial)

AM route for a moved away dynamic host exists along with the lisp-dyn eid Null0 route with the same route-preference.

Happens in an ESM single-hop mobility case on an away xTR. lisp creates a Null0 route for an away host discovered on another datacenter and needs it to win in order to trigger SMRs. However AM installs a route for the same /32 host pointing to the interface extended to another data-center. As a result traffic destined for that dynamic host will be tromboning over the dci link to the other data-center, since the map-cache on the remote data-center won't be updated.
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