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New Member

Local SPAN and RSPAN to one destination port

The following scenario is given :

        P1-----------------                                     --------------------P1

         |                   |                                    |                     |

         |  Switch 1    |------------------------------------|  Switch 2       |

         |                   |            Trunk                |                     |

        P2-----------------                                     ----------------------

Two Catalyst 3750 Switches connected with a trunk link.

On Switch 1 Port 2 (P2) a network analyzer is connected (single port)

Is there a way to SPAN traffic from port P1 on Switch 1 AND traffic

from port P1 on Switch 2 to this port (Port 2) ?

Any techniques to achieve this goal can be used (local SPAN, RSPAN...).

1 ACCEPTED SOLUTION

Accepted Solutions
Super Bronze

Re: Local SPAN and RSPAN to one destination port

Hi

From the manual:

The switch does not support a combination of local SPAN and RSPAN in a single session. That is, an RSPAN source session cannot have a local destination port, an RSPAN destination session cannot have a local source port, and an RSPAN destination session and an RSPAN source session that are using the same RSPAN VLAN cannot run on the same switch stack.

So- RSPAN the Switch 2 port accross the link to the  port X on switch 1.

SPAN the local Switch 1 port to porty Y on switch 1.

Don't allow ingress from the analyser, and attach both ports to it via a hub.

Or have two analysers.

Or - have a third switch as the destination RSPAN session for the ports from switch 1 and switch 2 (i.e. not mixing local SPAN and RSPAN).

Aaron

Please rate helpful posts..

Aaron Please remember to rate helpful posts to identify useful responses, and mark 'Answered' if appropriate!
2 REPLIES
Super Bronze

Re: Local SPAN and RSPAN to one destination port

Hi

From the manual:

The switch does not support a combination of local SPAN and RSPAN in a single session. That is, an RSPAN source session cannot have a local destination port, an RSPAN destination session cannot have a local source port, and an RSPAN destination session and an RSPAN source session that are using the same RSPAN VLAN cannot run on the same switch stack.

So- RSPAN the Switch 2 port accross the link to the  port X on switch 1.

SPAN the local Switch 1 port to porty Y on switch 1.

Don't allow ingress from the analyser, and attach both ports to it via a hub.

Or have two analysers.

Or - have a third switch as the destination RSPAN session for the ports from switch 1 and switch 2 (i.e. not mixing local SPAN and RSPAN).

Aaron

Please rate helpful posts..

Aaron Please remember to rate helpful posts to identify useful responses, and mark 'Answered' if appropriate!
New Member

Re: Local SPAN and RSPAN to one destination port

Hi Aaron,

thanks very much for your replay.

Excellent.

Oliver

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