08-19-2008 07:51 AM - edited 03-06-2019 12:53 AM
I tried to SPAN 3 source ports into a single destination port in a Cisco 3750 stack stack. Each time after I added the monitor session 1 destination statement, the destination port line protocol went down even thought a PC is connected. What is wrong with my configurations?
Switch stack consisted of 4 WS-C3750G-48PS 12.2(25)SEB4 C3750-IPBASE-M
interface GigabitEthernet3/0/5
switchport access vlan 2
switchport mode access
spanning-tree portfast
interface GigabitEthernet2/0/37
switchport access vlan 107
switchport mode access
switchport voice vlan 308
spanning-tree portfast
monitor session 1 source interface Gi3/0/2 - 3 , Gi3/0/5
monitor session 1 destination interface Gi2/0/37 ingress untagged vlan 2
switch#sh mon sess all
Session 1
---------
Type : Local Session
Source Ports :
Both : Gi3/0/2-3,Gi3/0/5
Destination Ports : Gi2/0/37
Encapsulation : Native
Ingress : Enabled, default VLAN = 2
Ingress encapsulation: Untagged
switch# sh int g2/0/37
GigabitEthernet2/0/37 is up, line protocol is down (monitoring)
08-19-2008 11:16 AM
There is nothing wrong with the config nor with the status of 2/0/37. When a port is configured to be the destination of a monitor session, it is ment to monitor only and not to work as a regular port, reason why it was designed to stay as protocol down. Afterwards, the ingress command was added to get a destination port to receive traffic from an specified vlan however the line protocol status will remain the same (down).
08-19-2008 12:25 PM
This is just more of the same stuff:
http://www.ciscotaccc.com/kaidara-advisor/lanswitching/showcase?case=K76078957
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