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Cisco Bug: CSCvi08610 - First SPAN session may not work if sessions are mixed with VLAN monitoring and Interface monitoring

Last Modified

Aug 13, 2019

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases

7.0(3)I4(4)

Description (partial)

Symptom:
With monitor session of VLAN mixed with monitor session of more than one interfaces - could lead to break the first monitor session of interfaces.

monitor session 1  
  source vlan 10 rx
  destination interface Ethernet2/49
  no shut
monitor session 2 
  source interface port-channel10 rx
  destination interface Ethernet1/49
  no shut
monitor session 3 
  source interface port-channel10 rx
  destination interface Ethernet1/50
  no shut

N9K-D1-2# show monitor 
Session  State        Reason                  Description
-------  -----------  ----------------------  --------------------------------
1        up           The session is up                                       
2        up           The session is up                                       
3        up           The session is up         
                              
N9K-D1-2# show int e1/49-50, e2/49 | in rate
  5 seconds input rate 240 bits/sec, 0 packets/sec
  5 seconds output rate 0 bits/sec, 0 packets/sec  <<<<<<<<<<<<< e1/49 no SPAN traffic sending to this interface
    input rate 232 bps, 0 pps; output rate 116.94 Kbps, 42 pps
  5 seconds input rate 240 bits/sec, 0 packets/sec
  5 seconds output rate 478040 bits/sec, 74 packets/sec <<<<<<<<e1/50 only this interface have SPAN traffic
    input rate 232 bps, 0 pps; output rate 138.30 Kbps, 48 pps
  5 seconds input rate 248 bits/sec, 0 packets/sec
  5 seconds output rate 477768 bits/sec, 74 packets/sec <<<<<<<<e2/49
    input rate 232 bps, 0 pps; output rate 18.83 Kbps, 1 pps

Conditions:
Monitor session with source as VLAN

Example
monitor session 1 
  source vlan xx
  destination interface Etherne x/y
  no shut
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