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SPAN session, need to comminicate with device on Destination port

wilson_1234_2
Level 3
Level 3

‎11-19-2008 05:17 AM - edited ‎03-06-2019 02:34 AM

I have several remote sites using 1861 routers with an 8 port PoE integrated switch module.

We need to monitor traffic on one port and send the monitored traffic to a second port.

So my monitor session is set up:

monitor session 1 source interface Fa0/1/0

monitor session 1 destination interface Fa0/1/1

The problem is when I configure the monitor session, I loose communication with the device in the destination port.

Is there any way for me to communicate normally with the device on the destination port and still monitor the device on the source port?

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7 Replies 7

Sebastian Helmer
Level 5
Level 5

‎11-19-2008 12:03 PM

Sorry I see no chance, you can only use the destination port for a monitor.

abstract of a design guide:

"You must dedicate the destination port for SPAN use"

Sebastian

John Blakley
VIP Alumni
VIP Alumni
In response to Sebastian Helmer

‎11-19-2008 12:09 PM

This is correct. Unfortunately, you can't use the destination port as a normal workstation any longer; it will only be able to "listen" to traffic.

--John

HTH, John *** Please rate all useful posts ***

wilson_1234_2
Level 3
Level 3
In response to Sebastian Helmer

‎11-19-2008 02:02 PM

We have the same setup using a Catalyst 2950 switch and it works:

monitor session 1 source interface Fa0/5

monitor session 1 destination interface Fa0/6 ingress vlan 1

But on the 1861, I do not have the "ingress" option when configuring the destination.

0 Helpful

ropethic
Level 4
Level 4

‎11-19-2008 12:29 PM

This is due to having one interface on the monitoring device. If you are managing the the device remotely, you will need to have two interfaces, one for promiscuous capture, other for IP connectivity.

When a port is configured as a span destination the port is in up/down status

I need to check if there is a command that allows incoming access.

wilson_1234_2
Level 3
Level 3
In response to ropethic

‎11-19-2008 02:03 PM

We have the same setup using a Catalyst 2950 switch and it works:

monitor session 1 source interface Fa0/5

monitor session 1 destination interface Fa0/6 ingress vlan 1

But on the 1861, I do not have the "ingress" option when configuring the destination.

0 Helpful

ropethic
Level 4
Level 4
In response to wilson_1234_2

‎11-19-2008 02:08 PM

Correct

Ingress, not supported

wilson_1234_2
Level 3
Level 3
In response to ropethic

‎11-19-2008 04:02 PM

Why?

And can I get it on a later IOS revision?

0 Helpful
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