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Cisco Bug: CSCvv11854 - HSRP vmac is learn from wrong ports on switch in hsrp Listen state

Last Modified

Aug 12, 2020

Products (1)

  • Cisco Nexus 6000 Series Switches

Known Affected Releases

7.3(3)N1(1) 7.3(7)N1(1) 7.3(7)N1(1b)

Description (partial)

Symptom:
Listen state device learn mac from wrong port.
N5KB# show mac address-table 
Legend: 
        * - primary entry, G - Gateway MAC, (R) - Routed MAC, O - Overlay MAC
        age - seconds since last seen,+ - primary entry using vPC Peer-Link
   VLAN     MAC Address      Type      age     Secure NTFY   Ports/SWID.SSID.LID
---------+-----------------+--------+---------+------+----+------------------
* 326      0000.0c07.ac1a    static    0          F    F  Po201
* 326      00de.fb07.4f7c    dynamic   0          F    F  Po100
* 326      00de.fbe3.34bc    dynamic   1800       F    F  Po100
* 326      00de.fbe6.5cfc    static    0          F    F  Po201
* 323      0000.0c07.ac17    dynamic   180        F    F  Po201   >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>abnormal,po201 ispeer-link
* 323      0050.5696.7c42    dynamic   0          F    F  Eth101/1/1
* 323      00de.fb07.4f7c    dynamic   0          F    F  Po100
* 323      00de.fbe3.34bc    dynamic   1800       F    F  Po100
* 323      00de.fbe6.5cfc    static    0          F    F  Po201
* 323      2c31.24b1.6d2c    dynamic   1800       F    F  Eth101/1/1


N5KB# show mac address-table 
Legend: 
        * - primary entry, G - Gateway MAC, (R) - Routed MAC, O - Overlay MAC
        age - seconds since last seen,+ - primary entry using vPC Peer-Link
   VLAN     MAC Address      Type      age     Secure NTFY   Ports/SWID.SSID.LID
---------+-----------------+--------+---------+------+----+------------------
* 326      0000.0c07.ac1a    static    0          F    F  Po201
* 326      00de.fb07.4f7c    dynamic   40         F    F  Po100
* 326      00de.fbe3.34bc    dynamic   1800       F    F  Po100
* 326      00de.fbe6.5cfc    static    0          F    F  Po201
* 323      0000.0c07.ac17    dynamic   10         F    F  Po100  >>>>>> normal, po100 is device N5KD
* 323      0050.5696.7c42    dynamic   10         F    F  Eth101/1/1
* 323      00de.fb07.4f7c    dynamic   10         F    F  Po100
* 323      00de.fbe3.34bc    dynamic   1800       F    F  Po100
* 323      00de.fbe6.5cfc    static    0          F    F  Po201
* 323      2c31.24b1.6d2c    dynamic   1800       F    F  Eth101/1/1

There issue can recovery auto.

Conditions:
+-------+        +-------+
| N5KC  +--------+ N5KD  |
+------++        ++------+
       |          |
       |          |
       |          | 
       |          |
       |          |
+------++        ++------+
| N5KA  +--------+ N5KB  |
+-------+        +-------+
         \      /
          \    /
           \  /
         +------+
         | N2K1 |
         +------+
            ||
            ||
          +----+
          | PC |
          +----+

4way hsrp
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