Maximus54
asked on
Cisco SPAN Configuration
We are using Websense to monitor and filter web traffic so we setup SPAN session to monitor web traffic on the Catalyst switch stack and everything was working fine then we upgraded Websense to 7.6 and upgraded the switch's IOS to 15.0 and after a while it stopped working.
I just wanted to know if I am now required to insert a new piece of code to the existing one because the SPAN configuration is not working. This is what I had to make the port a SPAN monitoring port:
monitor session 1 source interface FastEthernet1/0/1
monitor session 1 destination interface FastEthernet1/0/15 encapsulation replicate
Both are in the default same VLan
this is the output of sho monitor
Type : Local Session
Source Ports :
Both : Fa1/0/1
Destination Ports : Fa1/0/15
Encapsulation : Native
Ingress : Disabled
I just wanted to know if I am now required to insert a new piece of code to the existing one because the SPAN configuration is not working. This is what I had to make the port a SPAN monitoring port:
monitor session 1 source interface FastEthernet1/0/1
monitor session 1 destination interface FastEthernet1/0/15 encapsulation replicate
Both are in the default same VLan
this is the output of sho monitor
Type : Local Session
Source Ports :
Both : Fa1/0/1
Destination Ports : Fa1/0/15
Encapsulation : Native
Ingress : Disabled
Your config appears correct. Is it possible that the websense unit lost a settings in its config due to the upgrade? Also, verify that port 15 did not shut down for some reason.
ASKER
eeRoot, I have removed and uninstalled Websense and checked all of the settings and I dont think that is the problem. I suspected that it was the SPAN setting, I did a check on the destination port to see if traffic was being sent there( #show int Fa1/0/15 summary) and the Rx(ingress) shows up as 0 when the source port show more numbers. It sounds that the destination port is not getting any Rx traffic or is the Rx supposed to be 0.
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ASKER
eeRoot, good idea. I will try and let you know. thanks
I would run a wireshark test but if you are using the SPAN port for the Websense Network Agent there will be no return traffic because the Network Agent only "Sniffs" which is why it is not required to have an IP address. It is only a monitor port. Is this a Standalone Websense Install?
ASKER
I did plug in wireshark and it is picking up traffic after I took out the encapsulation replicate portion of the code from the destination port. In fact I am getting Request, Blocked and RTSU numbers on Websense counters but it is still not blocking. I have 2 NIC cards, both are configured with IP addresses, the NIC 1 connected to the listening port only has an IP and Mask (No gateway or DNS) and the NIC 2 connected to the destination has all the IP configuration in it. I set up NIC 1 as the monitoring NIC and NIC 2 as the blocking NIC. is there something wrong with the setup. It used to work.
And yes it is a standalone Websense install.
And yes it is a standalone Websense install.
ASKER
That's strange after I took out the encapsulation replicate portion in the switch code, the Real-Time Monitor mode works and I can see traffic which I was not able to before. Let me flip the blocking NIC
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ASKER
SO amatson78, should I also make the monitoring NIC the Blocking NIC then, I have not done it yet as I do not want to mess it up since part of is now working.
ASKER
Never mind it works now, I guess the solution is to take out the encapsulation replicate portion, this may be due to the IOS 15.0 upgrade. I left the NICs as is and it works One monitors, the other blocks. Thanks for all of your help guys, you lead me in the right direction.