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 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.

 

192.207.35.1

192.207.36.1

 

192.207.35.0

 

 

192.207.36.0

Finance

 

 

Personnel

1

2

3

4

192.207.35.11 192.207.36.12 192.207.35.13 192.207.36.14

Figure 9-1:Routing between VLANs

9-2

SUMMIT SWITCH INSTALLATION AND USER GUIDE

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Extreme Networks Summit1 manual Router Interfaces, 1Routing between VLANs