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How can I mirror all ports on CISCO 3750 switches to one Gigabyte port?

Hi,

I have a requirement to mirror all the ports on my 7 CISCO 3750 switches, which are in 3 separate stacks, to one single Gigabyte Ethernet port.

Does anyone know how I can do that?

Thanks in advance.

4 REPLIES

Re: How can I mirror all ports on CISCO 3750 switches to one Gig

You need to configure RSPAN (remote span ) on all 7 CISCO switches.

check the sample config:

vlan 999

remote-span

monitor session 1 source interface fastethernet 1/1 both

monitor session 1 destination remote vlan 999

Catalyst B

vlan 999

remote-span

Catalyst C

vlan 999

remote-span

monitor session 1 source remote vlan 999

monitor session 1 destination interface fastethernet 4/48

Check the link:

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/122sx/swcg/span.htm#wp1059942

Please rate me dont hate me;

Regards,

vlad

Community Member

Re: How can I mirror all ports on CISCO 3750 switches to one Gig

Vlad, thanks a heap for your response.

I want to apply to my sitation. Please let me know if I get them right in the following:

Catalyst A

vlan 901

remote-span

monitor session 1 source interface fastethernet 1-48 (I want to monitor all ports on the CISCO 3725)

monitor session 1 destination remote vlan 901

Catalyst B

vlan 901

remote-span (If I don't need to monitor this switch, do I still need to put anything into this switch at all?)

Catalyst C

vlan 901

remote-span

monitor session 1 source interface fastethernet 1-48 (I want to monitor all ports on this switch as well)

monitor session 1 source remote vlan 901

monitor session 1 destination interface gigabitethernet 3 (There are 4 Gigabit Ethernet Uplink in CISCO 3750, I want all the traffic to go to port 3, is this the right way to do?)

Thanks in advance.

Re: How can I mirror all ports on CISCO 3750 switches to one Gig

Hello Blue,

You need to configure the vlan in every device that passes this traffic. If Cat B is in the middle (A-B-C), you'll need to configure the vlan there.

and dont forget about the options [in out both] to make sure you'll get the traffic you need.

And I believe to specify the range you need to do something lik

fasthernet 0/1 - 48

By the way, rate me , I'd be glad.

Vlads

Purple

Re: How can I mirror all ports on CISCO 3750 switches to one Gig

You are probably going to overrun the port if you span 7 complete switches into one port and any statistics or whatever you are collecting will be inaccurate .

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