05-24-2012 11:01 AM - edited 03-07-2019 06:53 AM
Hi all, I'm trying to configure a mirror port on a 3750. This configuration needs to replicate data from local ports, but I need that also act as a regular access port.
With the initial configuration, SPAN port, there is no problem, all the data of the configurated ports is replicating in the configurated port. On the port configurated as mirror there is a PC connected for audio recording. When the port is not operating as SPAN there is communications without problem over the LAN. But when I configure the port as SPAN, communication is interrupted.
Here is the actual configuration:
SWITCH1-PISO7#sh monitor session 1
Session 1
---------
Type : Local Session
Source Ports :
Both : Fa1/0/1-7,Fa1/0/9-12,Fa1/0/32-33,Fa1/0/35,Fa1/0/38
Destination Ports : Fa1/0/47
Encapsulation : Native
Ingress : Enabled, default VLAN = 215
Ingress encap : Untagged
SWITCH1-PISO7#sh run int fa1/0/47
Building configuration...
Current configuration : 112 bytes
!
interface FastEthernet1/0/47
switchport access vlan 215
switchport mode access
spanning-tree portfast
end
SWITCH1-PISO7#sh ver
Cisco IOS Software, C3750 Software (C3750-IPSERVICES-M), Version 12.2(50)SE1, RELEASE SOFTWARE (fc2)
****output omitted****
Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 52 WS-C3750V2-48PS 12.2(50)SE1 C3750-IPSERVICES-M
****output omitted****
I have read on another post (https://supportforums.cisco.com/thread/2059062) that there is a problem with this configuration on this specific platform.
Is this correct?? Does any one have a link on cisco documentation that confirm this? Is there a problem with my configuration??
beforehand thanks for your help
Solved! Go to Solution.
05-24-2012 12:24 PM
Hi Pedro,
For the 3750 family, the span destination ingress forwarding capability's only purpose is to enable ingress traffic forwarding of frames received on the span destination port from an Intrusion Detection Systems (IDS) or comparable device. Like a span destination port without ingress forwarding, MAC address learning is disabled on a span destination port with ingress forwarding, and a span destination port with ingress forwarding does not transmit any traffic except that required for the SPAN session. See the note in the folllwing 3750 guide:
So if the port on 3750 is configured as SPAN destination, it cannot act as regular access port.
Kind Regards,
Ivan
**Please grade this post if you find it useful.
05-24-2012 11:33 AM
Hi,
I havent had experienced it myself, but i've read in a couple or Data Sheets that, C3750 has actually Bidirectional data support on the Switched Port Analyzer (SPAN).
here is a Link:
plz Rate if it helped.
Soroush.
05-24-2012 12:24 PM
Hi Pedro,
For the 3750 family, the span destination ingress forwarding capability's only purpose is to enable ingress traffic forwarding of frames received on the span destination port from an Intrusion Detection Systems (IDS) or comparable device. Like a span destination port without ingress forwarding, MAC address learning is disabled on a span destination port with ingress forwarding, and a span destination port with ingress forwarding does not transmit any traffic except that required for the SPAN session. See the note in the folllwing 3750 guide:
So if the port on 3750 is configured as SPAN destination, it cannot act as regular access port.
Kind Regards,
Ivan
**Please grade this post if you find it useful.
05-24-2012 12:40 PM
Nice to know, Thanks!
05-28-2012 08:22 AM
Soroush, thanks for your help.
Ivan, thank you for the information, very helpful.
05-28-2012 12:02 PM
welcome, Pedro!
Kind Regards,
Ivan
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