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New Member

How many mirror ports?

I am just wondering if there is a rule of thumb as to how many mirror ports you should put on a 3560G.  Our email administrators have asked me to mirror 5 or 6 ports going to different servers and while we should have the processing power and bandwidth, I don't want to cause and degregation in the network. I know the option is there to mirror all traffic from a VLAN to a paticular port.  We aren't going to be doing any of that, the mirror is always going to be from one physical machine on a port to a capture pc on another port.

So, what stats on the switch should I be looking at to gauge if these mirror ports are taxing the system?  We currently have 3 ports running now and have no issues.

THANKS!

  • LAN Switching and Routing
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Accepted Solutions
New Member

Re: How many mirror ports?

On the Catalyst 2900XL/3500XL Series Switches, the number of destination ports that are available on the switch is the only limit to the number of SPAN sessions.

From here:  http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a008015c612.shtml

3 REPLIES
New Member

Re: How many mirror ports?

On the Catalyst 2900XL/3500XL Series Switches, the number of destination ports that are available on the switch is the only limit to the number of SPAN sessions.

From here:  http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a008015c612.shtml

New Member

Re: How many mirror ports?

That makes sense.  I guess there's no difference between having 48 busy ports and 24 busy ports being mirrored to 24 destinations.

Thanks for the info.

New Member

Re: How many mirror ports?

Yeap.  Glad I could help.

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