Rockwell Automation 1783-Mxxx Stratix 8000 and 8300 Ethernet Managed Switches User Manual - Manual (Page 82)

82 Rockwell Automation Publication 1783-UM003I-EN-P - March 2014
Chapter 3 Switch Software Features
Port Mirroring Port mirroring is for advanced users with experience in troubleshooting traffic
and protocol issues on networks.
The port mirroring feature copies (or mirrors) traffic on one port to a monitoring
port where the packet can be captured by a network protocol analyzer tool. Use
port mirroring as a diagnostic tool or debugging feature.
Port mirroring does not affect the switching of network traffic on the monitored
port. You must dedicate a monitoring port for port mirroring use. Except for
traffic that is being copied for the port mirroring session, the monitoring port
does not receive or forward traffic.
Port mirroring can be configured by assigning the Port Mirroring port role on a
switch port by using the Device Manager Web interface. See
Chapter 4, Manage
the Switch via the Device Manager Web Interface .
Layer 3 Routing
(Stratix 8300 switch only) The Stratix 8300 Ethernet managed switch uses IP address routing to map
subnetworks (subnets) to an individual VLAN. In some network environments,
VLANs are associated with individual networks or subnetworks. In an IP
network, each subnetwork is mapped to an individual VLAN. Configuring
VLANs helps control the size of the broadcast domain and keeps local traffic
local. However, network devices in different VLANs cannot communicate with
one another without a Layer 3 device to route traffic between the VLAN,
referred to as inter-VLAN routing. You configure one or more Layer 3 switches
to route traffic to the appropriate destination VLAN.
Figure 14 shows a basic routing topology.
Figure 14 - Example of Routing Topology
Switch A is in VLAN 10, and Switch B is in VLAN 20. The Layer 3 switch has an
interface in each VLAN.
When Host A in VLAN 10 needs to communicate with Host B in VLAN 10, it
sends a packet addressed to that host. Switch A forwards the packet directly to
Host B, without sending it to the Layer 3 switch.
When Host A sends a packet to Host C in VLAN 20, Switch A forwards the
packet to the Layer 3 switch, which receives the traffic on the VLAN 10 interface.
The Layer 3 switch checks the routing table, finds the correct outgoing interface,
and forwards the packet on the VLAN 20 interface to Switch B. Switch B
receives the packet and forwards it to Host C.
Layer 3 Switch