3Com CoreBuilder 3500, Implementation Manual

Page: 271 / 592

Key Concepts 271
Router Interfaces A router interface connects the router to a subnet. If you use your system
for IP routing, more than one port can connect to the same subnet.
Each router interface has an IP address and a subnet mask. This router
interface address defines both the number of the network to which the
router interface is attached and its host number on that network. A
router interface IP address serves two functions:
■
Sending IP packets to or from the router
■
Defining the network and subnet numbers of the segment that is
connected to that interface
Figure 47 Routing Interfaces
To gain access to the system using TCP/IP or to manage the system using
Simple Network Management Protocol (SNMP), set up an IP interface to
manage your system, either in-band (with your regular network traffic) or
out-of-band (with a dedicated network).
■
In-Band Management
— Set up an IP routing interface and at least
one virtual LAN (VLAN). See Chapter 9 for information about how to
define a VLAN.
■
Out-of-Band Management — Assign an IP address and subnet
mask for the out-of-band Ethernet port on your system through the
Administration Console or through the Web Management system.
(See “IP Addresses” earlier in this chapter for background information
about IP addresses and subnet masks.) The out-of-band Ethernet port
is the 10BASE-T port on the system processor module. It is not
associated with a port number.
158.101.1.2
Network 1
158.101.1.1
158.101.2.2
Network 2
158.101.3.2
Network 3
158.101.2.1
158.101.3.1
Router
1
2
3
= Interface 1
= Interface 2
= Interface 3
1
2
3