Extreme Networks Summit1 - Manual (Page 132)

9-2 S UMMIT S WITCH I NSTALLATION AND U SER G UIDE
IP U NICAST R OUTING
R OUTER I NTERFACES
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 Summit.
Each IP address and mask assigned to a VLAN must represent a unique IP
subnet. You cannot configure the same IP subnet on different VLANs.
In Figure 9-1 , A Summit is depicted with two VLANs defined; Finance and Personnel.
Ports 1 and 3 are assigned to Finance; ports 2 and 4 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 9-1: Routing between VLANs
1
Finance Personnel
192.207.35.11 192.207.36.12 192.207.35.13 192.207.36.14
192.207.36.1 192.207.35.1
2 3 4
192.207.36.0 192.207.35.0
Summit.bk : 9ROUT.FM Page 2 Thursday, June 18, 1998 9:27 AM