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Cisco Bug: CSCur33701 - N7K: LISP /32 Routes Not Downloaded To Linecard When Card OIR'd/Reloaded

Last Modified

Sep 11, 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 7700 10-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch

Known Affected Releases

6.2(10) 6.2(10)S93

Description (partial)

On a 7K with LISP configured, after a line card reload, OIR, or insertion, not all of the LISP /32 routes may be downloaded to the card once it is powered up and is brought online. This results in traffic being forwarding to the supervisor and being limited by the COPP policy on the switch. Traffic flows may be forwarded at a reduced rate or not at all. This can be verified with a "show forwarding route <prefix>" command, which will show the /32 route installed on other line cards with a valid next-hop address, but on the problem linecard, it may show a /25 route with "receive" as it's next-hop.

This can occur with a Nexus 7k running LISP Discovery, where /32 hosts are learned on the 7k via LISP. The problem can appear when a line card is reloaded, OIRd, or a new card is installed, and the card is powered up and brought online. This affects traffic coming inbound to the ports off the affected card.
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