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New Member

Span server vlan on Catalyst 6509

Hello! We have a 6500 running Cat OS 8.8-5-8. We have a snort device that we would like to monitor our server vlan with, Vlan 101. I setup this snort on a port, 2/28, which is a GB port on a WS-X6548-GE-TX card.

We have experienced some server performance issues since I setup the span. Intermittently we cannot gain access to a server, ping is slow to respond, drops ping requests, no rdp, etc. It sure seems suspicious that it is due to this span. I moved some of the servers that were connected in the same banks as this snort port to another card and port, and they now perform fine.

My question is, am I doing this wrong? Is there a different way to accomplish this and not effect performance?

My command I ran on the switch was:

#switch port analyzer

set span permit-list disable

set span 101 2/28 both session 1 inpkts disable learning enable multicast enable


Re: Span server vlan on Catalyst 6509

You could be running into something like this.

Read this. 6548's not really a good choice to run large server farms on. this sounds like what you are seeing.Seeing that you are spanning a whole vlan which is a lot of traffic.

New Member

Re: Span server vlan on Catalyst 6509

Perfect. Now what I wanted to hear, but it explains alot! Thanks for the quick reply.

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