I have a unicast IP flow (no L2 or L3 multicast or broadcast) running between a source device connected to an "access" port in vlan 21 and a destination device connected to an "access" port in vlan 1. Routing between the vlans happens on an external device. I also have a pc connected to another "access" port in vlan 1 that is running a sniffer program. No span/monitor is set up.
Why can I see the unicast flow between the first 2 devices on the "sniffer" pc ?
I thought a switch would only forward packets to a port if the destination mac of the packet matched an entry in the cam table for that port.
Is the unicast flow established? If the switch does not have a CAM table entry for that MAC address - i.e. does not know where the destination MAC address is (because is hasn't seen any traffic from your PC in VLAN 1) then the switch will flood the traffic out of all ports in VLAN 1 because it doesn't know where the MAC address of the PC is. This is normal switch behaviour in the absense of MAC address information.
We have 3 identical switches configured by someone else and would like to claim some of the Gigabit ports(G1/G2/G3/G4) for use on servers. When we try to change the wiring and configuration, we run in to connectivity issues. Attached is a des...
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...