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Cisco Bug: CSCum05788 - High ECMP failover time

Last Modified

Nov 27, 2020

Products (7)

  • CiscoPro Workgroup EtherSwitch Software
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco Nexus 7000 4-Slot Switch
  • Cisco Nexus 7700 18-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7700 10-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch

Known Affected Releases


Description (partial)

The symptoms observed are ping loss in the request path to the ping destination. In the routing table 2 paths are shown for the destination to the both equal cost. We would expect that simple fail over would occur and the other available path in the routing table should be used.

The topology in use is simple diamond. the source and destination client have  single gateway device that then has ECMP to the destination. the gateway devices connected via ECMP to two middle devices and then destination Gateway that has the same mirrored topology. the failure is observed when on the source gateway the in use path is broken by shutting the interface to the intermediate routers. The path in use is checked with trace route on the end clients. The end clients are windows PC running the a ping utility that allows for modification of ping frequency/response time.
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