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Cisco Bug: CSCup37565 - Documentation update for vPC loop avoidance rule in best practices guide

Last Modified

Aug 20, 2014

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 7700 18-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch
  • Cisco Nexus 7700 10-Slot Switch

Known Affected Releases

6.2(8)

Description (partial)

Symptom:
This is a doc bug to clarify the Loop Avoidance Rule in the vPC Best Practices Guide -

"vPC loop avoidance rule states that traffic coming from vPC member port, then crossing vPC peer-link is NOT allowed to egress any vPC member port; however it can egress any other type of port (L3 port, orphan port, ...).
The only exception to this rule occurs when vPC member port goes down. vPC peer devices exchange member port states and reprogram in hardware the vPC loop avoidance logic for that particular vPC. The peer-link is then used as backup path for optimal resiliency."

Traffic does not need to ingress a vPC member port for this rule to be applicable.

http://www.cisco.com/c/dam/en/us/td/docs/switches/datacenter/sw/design/vpc_design/vpc_best_practices_design_guide.pdf#page=8

Conditions:
vPC
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