Sample of config for port mirroring

[Jason Williamson]

I have a 2960g that I need to mirror one port to 6 other ports, how would I go about configuring that?

[Alessio Andreoli]

Maybe this helps:

https://supportforums.cisco.com/docs/DOC-2632

Hth
Alessio

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[Bilal Nawaz]

Hello, here's a basic example:

Switch(config)# monitor session 1 source interface fastEthernet0/1

Switch(config)# monitor session 1 destination interface fastEthernet0/10

This is saying mirror / SPAN fa0/1 to the destination of fa0/10

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

Hope this helps

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[Jason Williamson]

Bilal, thanks but how about 1 to many?

[Bilal Nawaz · Accepted solution]

Hello Jason, Cisco allow one to many with the - or , options. E.g.

Switch(config)# monitor session 1 source interface fastEthernet0/1

Switch(config)# monitor session 1 destination interface fastEthernet0/10 - 11

Which is 10 to 11
Or

Switch(config)# monitor session 1 destination interface fastEthernet0/10, fa0/12

Which is 10 and 12

(Syntax maybe slightly different as I'm just trying to remember from memory, but the comma and hyphen are the options you need)

Hope this helps

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[Bilal Nawaz · Accepted solution]

Or:

Note: You can use monitor session session_number destination command multiple times to configure multiple destination ports.

In that Cisco link I gave in my post
E.g.

Switch(config)# monitor session 1 source interface fastEthernet0/1

Switch(config)# monitor session 1 destination interface fastEthernet0/10

Switch(config)# monitor session 1 destination interface fastEthernet0/11

Switch(config)# monitor session 1 destination interface fastEthernet0/12

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[paul driver]

Hello

not posibble to have one tp many

however you can have a whole vlan to a span port
res
paul

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[paul driver]

Bilal
isnt the OP refering to 1 to many imterfaces on a single span session - if so this isnt possible.

res
paul



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[Bilal Nawaz]

Hello Paul, my understanding might not be correct. I thought the OP was asking if one single port can be replicated to many other ports?

So from one interface, mirroring or SPANing to a bunch of ports. Same session.

In which case yes it is possible...

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[paul driver]

hello
maybe then my interpretation is incorrect


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[Jason Williamson]

You both were very helpful for me to get this done. I thought we weren't going to be able to send monitor destination to more than 2 interfaces. I was able to set it to Gi0/28-31, and Gi0/8-12 as well.

I still believe our enterprise needs a Gigamon implementation for sniffing, IDP, IPS, Web, AV, and other DMZ/internet monitoring things..

I'll see if these will work as-is, and we're still going to push for a dual-datacenter Gigamon w/ centralized monitoring tools.

Thanks!