Router Interfaces - Extreme Networks ExtremeWare 7.2e Installation And User Manual

IP Unicast Routing

Router Interfaces

The routing software and hardware routes IP traffic between router interfaces. A router interface is
simply a VLAN that has an IP address assigned to it.
As you create VLANs with IP addresses belonging to different IP subnets, you can also choose to route
between the VLANs. Both the VLAN switching and IP routing function occur within the switch.
NOTE
Each IP address and mask assigned to a VLAN must represent a unique IP subnet. You cannot
configure the IP address belonging to the same subnet on different VLANs.
In Figure 44, a switch is depicted with two VLANs defined; Finance and Personnel. Port 8-15 are
assigned to Finance; ports 24-48 are assigned to Personnel. Finance belongs to the IP network 192.207.35.0;
the router interface for Finance is assigned the IP address 192.206.35.1. Personnel belongs to the IP
network 192.207.36.0; its router interface is assigned IP address 192.207.36.1. Traffic within each VLAN
is switched using the Ethernet MAC addresses. Traffic between the two VLANs is routed using the IP
addresses.
Figure 44: Routing between VLANs
192.207.35.1 192.207.36.1
192.207.35.0 192.207.36.0
Finance Personnel
8 - 15 24 - 48
192.207.35.11
192.207.36.12
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