Rockwell ArmorStratix 5700 series, Instructions Manual

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330 Rockwell Automation Publication 1783-UM007F-EN-P - September 2016
Chapter 7 Configure Switch Features
Layer 3 Routing Stratix 8300 and Stratix 5400 and Stratix 5410 Layer 3 firmware models use
IP address routing to map subnetworks (subnets) to an individual VLAN. In
some network environments, VLANs are associated with individual networks
or subnets. In an IP network, each subnetis 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 capable switches to route traffic to the appropriate destination
VLAN.
Figure 46 shows a basic routing topology.
Figure 46 - 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 communicates with Host B in VLAN 10, it sends a
packet that is 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.
STCN Interface Configure segment topology change notices (STCNs) for a port. The default is None.
TCNs are used within the segment to notify REP neighbors of topology changes. At the edge of the segment, REP can propagate the
notification to the STP or to the other REP segments.
STCN Segment Configure STCNs to a segment ID. The default is a blank field.
TCNs are used within the segment to notify REP neighbors of topology changes. At the edge of the segment, REP can propagate the
notification to the STP or to the other REP segments.
STCN STP Configure STCNs to an STP network. The default is cleared checkbox.
TCNs are used within the segment to notify REP neighbors of topology changes. At the edge of the segment, REP can propagate the
notification to the STP or to the other REP segments.
Table 86 - REP Fields (Continued)
Field Description
Layer 3 Switch
VLAN 10 VLAN 20
Host
Host
ISL Trunks
Switch A
Switch B
Host