Router Interfaces - Extreme Networks BlackDiamond 6800 User Manual

IP U R
NICAST OUTING
R I
OUTER 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 BlackDiamond.
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 8-1, a BlackDiamond is depicted with two VLANs defined; Finance and
Personnel. All ports on slots 1 and 3 are assigned to Finance; all ports on slots 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.
1 2
192.207.35.1
192.207.35.0
Finance
1 2
192.207.35.11
192.207.36.12
Figure 8-1: Routing between VLANs
8-2
3 4 A
192.207.36.1
3 4
192.207.35.13
192.207.36.14
B 5 6
192.207.36.0
Personnel
7 8
BD_010
B D
LACK IAMOND
U G
SER UIDE