From: Robert Smith (thecure007@gmail.com)
Date: Thu May 15 2008 - 11:55:51 ART
Hi Alexei,
I borrowed some switches which I am accessing remotely and there is where I
am doing my switching labs. However I don't have access to a PC there, only
to the switches.
So in order to lab a SPAN scenario, I use two switches as hosts (sw1 and
sw4) and one more switch to act actually as a switch doing span (sw3).
I want to accomplish this:
Sw1, sends a ping to a vlan interface on sw3. Sw3 with a monitor session
takes that packet from the vlan and sends a copy to interface fa0/20.
SW1(fa0/16)--------------------------(fa0/13)SW3(fa0/20)------------------(fa0/20)SW4
(acts as a sending pc) (acts as a real switch) (acts
as a destination pc)
So I was wondering how to verify that SPAN is working with some kind of
debug on the switch that is acting as the destination PC for the SPAN
scenario.
Do I really need a real pc with a sniffer installed connected to the span
destination port to actually verify that the switch is sending copies of the
original packets out its fa0/20?
I am still unable to prove it with a switch with a no switchport interface
connected to an access port acting as a destination span port.
Thanks for your help,
On Thu, May 15, 2008 at 4:18 AM, Alexei Monastyrnyi <alexeim@orcsoftware.com>
wrote:
> Robert,
> sorry, I didn't get it from your first mail.
>
> What are you trying to achieve? Do you want to verify SPAN and build a
> scenario around it? Or do you have this particular scenario with SPAN and
> need to verify it?
>
> A.
>
> Robert Smith said the following on 5/14/2008 7:10 PM:
>
>> Hi Experts,
>>
>> I am trying to verify that the following scenario is working:
>>
>> SW1(fa0/16)------(fa0/13)SW3(fa0/20)----(fa0/20)SW4
>>
>> SW1:
>> interface FastEthernet0/16
>> no switchport
>> ip address 21.21.21.1 255.255.255.0
>> end
>>
>> SW4:
>> interface FastEthernet0/20
>> no switchport
>> ip address 23.23.23.4 255.255.255.0
>> end
>>
>> SW3:
>> interface FastEthernet0/13
>> switchport access vlan 21
>> switchport mode access
>> switchport nonegotiate
>> end
>> !
>> interface FastEthernet0/20
>> switchport access vlan 23
>> switchport mode access
>> switchport nonegotiate
>> end
>> !
>> int vlan 21
>> ip address 21.21.21.3 255.255.255.0
>> !
>> monitor session 2 source interface Fa0/13
>> monitor session 2 destination interface Fa0/20
>>
>> So what I am trying to accomplish is... when sw1 pings sw3 int vlan21, sw3
>> sends a copy of this traffic to sw4 on its fa0/20 port. However when I
>> turn
>> debug monitor all on sw3 and debug ip packet detail on sw4 on, I don't get
>> any output. The ping in sw1 shows as successful.
>>
>> Is my verification method wrong? Am I missing something?
>>
>> Thanks in advance,
>>
>>
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