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Cisco Bug: CSCuq88032 - HSRP standby in vPC will not program G flag if Priority is 0

Last Modified

Nov 27, 2020

Products (8)

  • CiscoPro Workgroup EtherSwitch Software
  • 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

6.1(5) 6.2(8a) 7.1(0)ZD(1)

Description (partial)

HSRP VMAC is not programmed with the G flag in the software MAC table on vPC peer who is HSRP standby:

RTP-Agg2# sh hsrp brief
*:IPv6 group   #:group belongs to a bundle
                     P indicates configured to preempt.
 Interface   Grp  Prio P State    Active addr      Standby addr     Group addr
  Vlan2       2    0      Standby          local           (conf)

RTP-Agg2# sh mac ad ad 0000.0c07.ac02
        * - primary entry, G - Gateway MAC, (R) - Routed MAC, O - Overlay MAC
        age - seconds since last seen,+ - primary entry using vPC Peer-Link,
        (T) - True, (F) - False
   VLAN     MAC Address      Type      age     Secure NTFY Ports/SWID.SSID.LID
* 2        0000.0c07.ac02    static       -       F    F  vPC Peer-Link

This is condition is seen when the HSRP configuration includes a track object and the decrement value will set the priority to less than or equal to zero when the track object is in a down state:

interface Vlan2
  hsrp 2
    priority 80
    track 10 decrement 80 <<<<<<< This decrement value is greater than or equal to the configured or default priority
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