Symptom
Here are six monitor sessions totally.
SPAN filter cannot work well when we configure normal span on 1st session to 4th session,
then configure FSPAN on the 5th session and 6th session.
For example,
Issue happens:
1)First, configure the normal SPAN on 1st session to 4th session
monitor session num1 source interface Gi1/0/5
monitor session num1 destination interface Gi1/0/6
monitor session num2 source interface Gi1/0/7
monitor session num2 destination interface Gi1/0/8
monitor session num3 source interface Gig 1/0/3
monitor session num3 destination interface Gig 1/0/4
monitor session num4 source interface Gig 1/0/15
monitor session num4 destination interface Gig 1/0/16
2)Next, configure FSPAN on 5th to 6th session
monitor session num5 source interface Gig 1/0/2
monitor session num5 destination interface Gig 1/0/9
monitor session num5 filter ip access-group A
monitor session num6 source interface Gig 1/0/1
monitor session num6 destination interface Gig 1/0/11
monitor session num6 filter ip access-group B
The issue doesn't happen:
1)Configure FSPAN on 1th&2th session or 3th&4th session or 1th&3th session or 2th&4th session.
monitor session num5 source interface Gig 1/0/2
monitor session num5 destination interface Gig 1/0/9
monitor session num5 filter ip access-group A
monitor session num6 source interface Gig 1/0/1
monitor session num6 destination interface Gig 1/0/11
monitor session num6 filter ip access-group B
2)Configure normal FSPAN on the remaining session.
monitor session num1 source interface Gi1/0/5
monitor session num1 destination interface Gi1/0/6
monitor session num2 source interface Gi1/0/7
monitor session num2 destination interface Gi1/0/8
Conditions
At least 5 monitor sessions are be configured.
Workaround
when we put "configure FSPAN " at 1st to 4th session, then the issue doesn't occur.
Further Problem Description
Issue can also be found on 3850/3650 (16.12.3/16.9.5).
