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Now in this topology I'm not using genus 3 genus 3 and Sysco viral do not currently support spam.
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So what I'm using are physical Cisco routers which are connected to 20 950 physical Cisco switches which
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in turn are connected to 30 750 Cisco switches I've got a PCI connected to the 30 750 switch and it's
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running wire shock and we'll use it to capture traffic from the network.
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Now I'm going to demonstrate in a moment that when traffic is sent from Rod a 1 2 rod or 2.
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In other words unique cost traffic such as pings or telnet or sent from router 1 to Rod add to the traffic
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will be sent to the first 29 50 which in turn will be sent to the first 30 750 which in turn will be
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sent to the thirty seven fifty two switch and that will continue until the traffic arrives at about
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a 2 thus capturing P.S. will not have visibility of unit cost traffic because when the MAC address table
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of switch one is populated it's simply going to switch the traffic from this interface to for example
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this interface to forward the traffic it to traffic is only going to be sent out of this interface if
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it's sent it to unknown unit cost addresses multicast addresses or broadcast addresses or specifically
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sent to this capturing device so the capturing device will have no visibility of traffic sent from road
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a one two road a two unless we enable span or port of monitoring on the thirty seven fifty switch.
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So firstly demonstrate that traffic sent from Rado want to write it to is not received by the capturing
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P.C. and then will configure span on the switch so that the P.C. is able to capture the traffic using
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Y shock.
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Now in this topology I'm not using genus 3 genus 3 and Cisco viral do not currently support spam.
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So what I'm using are physical Cisco routers which are connected to 29 50 physical Cisco switches which
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in turn are connected to 30 750 Cisco switches.
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I've got a PCI connected to the 30 750 switch and it's running wires shock and we'll use it to capture
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traffic from the network.
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Now I'm going to demonstrate in a moment that when traffic is sent from Rod a 1 2 rod a 2.
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In other words unique cost.
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Traffic such as pings or telnet or sent from router 1 to Rod add to the traffic will be sent to the
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first 20 50 which in turn will be sent to the first 30 750 which in turn will be sent to the thirty
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seven fifty two switch and that will continue until the traffic arrives at right at 2.
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Thus capturing P.S. will not have visibility of unit cost traffic because when the MAC address table
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of switch one is populated it's simply going to switch the traffic from this interface to for example
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this interface to forward the traffic to it to traffic is only going to be sent out of this interface
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if it's sent to unknown unique cost addresses multicast addresses or broadcast addresses or specifically
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sent to this capturing device.
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So the capturing device will have no visibility of traffic sent from road a 1 2 Road a 2 unless we enable
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span or port of monitoring on the thirty seven fifty switch.
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So firstly demonstrate that traffic sent from Rado want to write it to is not received by the capturing
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P.C. and then will configure span on the switch so that the P.C. is able to capture the traffic using
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Y shock as the console of the 37 50 switch show MAC address table some MAC addresses are listed in the
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table
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what I'll do now is ping from wrote a one to Robert to show IP interface brief Rada one has this IP
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address and write it to has this IP address which we can see on the console of right a T so that is
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the IP address of Robert A T
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A 1 is once again able to ping Robert it 2 so when we look at the MAC address table off switch one previously
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we only had those three MAC addresses in the table but now notice we have this MAC address as well as
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this MAC address in the table I have configured the MAC address of a one as follows some using a Cisco
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vendor code MAC address and to make it simple I've specified the MAC address of root of 1 as follows
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On rather it too often something similar so MAC address is the Cisco vendor code zeros and a two so
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at this point the first thirty seven fifty switch has learnt about the MAC addresses of right one and
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wrote a two to keep things simple I haven't configured any villains all devices on VLAN 1 Let's capture
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traffic in why shock on our P.C..
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So it's currently receiving some traffic
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let's do a ping from route one to write it to once again and I'll filter for ICMP traffic in the output.
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Here you can see that the PCI is not receiving any ICMP traffic from router 1 2 out of 2 and in the
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same way if reported to pings write a one no ICMP traffic is shown on the capturing.
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P.S. but if four out of one pings this window's P.C. which has an IP address of 10 dot wondered one
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to triple to
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notice we see the ICMP packets.
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So why shock is able to capture traffic from 10 1 1 1 going to 10 1 1 2 2 2 so the piece is not able
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to capture unique cost traffic st from road 1 to round 2.
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What about multicast traffic in this example you can see that the ICMP traffic was received to the multicast
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address so wrought a one with IP address tendered wandered wandered one be sending traffic to the multicast
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address 239 wandered wandered 1
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you can see as an example that the source MAC addresses Route One destination MAC address is 0 1 0 0
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5 v which is the multicast MAC address in IP version for as you can see over there what about a broadcast
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so ping tendered one that one the 255 and I'll just repeat this once as you can see here broadcast traffic
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is being received by the P.C. so in other words unique cos traffic is sent from router 1 to the capturing
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device is forwarded out of this port and that's based on the Mac address
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shown here as learnt by the 30 750 switch on this P.C.
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on have changed.
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The MAC address in Windows
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2s a bunch of zeros and a one.
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So the MAC address is
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eleven zeros followed by one.
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And that was learnt by the switch on Fost Ethan at 1 0 5 as shown over here so unique cost traffic gets
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forwarded to the P.C. multicast traffic gets forwarded to the P.C. and that's because multicast MAC
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addresses are not added to the MAC address table in the same way that a unit cost of MAC addresses are
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broadcast traffic is also forwarded to the P.C..
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So to summarize
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I'll restart to the white shock capture unicorns.
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Traffic sent from Rhonda want to write it too is not received by the capturing device multicast traffic
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is received broadcast traffic is received if we want to capture traffic from right one to write it to
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for troubleshooting as an example we would need to enable span on this port or merging to use the other
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term so that traffic sent and received on this port or this port or on V land 1.
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In this example is forwarded out of this port so that the capturing device can see the traffic as another
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example.
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If we telnet from right of one to write it two and log in the capturing device does not see the Telnet
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traffic so we can't see the session from Radha one to write it too.
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And that's because the switch is doing what it's supposed to do.
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It's forwarding traffic from this interface to this interface and not sending it out of unnecessary
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ports.
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So now let's configure span so that the capturing device can see the unit cost to traffic.
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