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52
VLAN Configuration
The Virtual LAN feature can be used to partition a switch or a stack of switches into
several Virtual LANs, each containing its own set of ports (the terms Virtual LAN
and domain are interchangeable). Packets are forwarded only between ports
belonging to the same. The benefit of Virtual LAN is to restrict access from one
segment to another, either for security purposes or to reduce intersegment traffic.
Figure 15 illustrates a switch with four VLANs.
VLAN 1
Ports 1, 2, 3, 10
VLAN 3
Ports 4, 7, 9
MANAGEMENT
1
2
Figure 15. Switch with Four VLANs
To set up domains using the VLAN Configuration menu, specify the ports
belonging to the domains, then set up the IP configurations, trap configuration (trap
receivers are associated with a set of VLANs and a receiver IP address) and STP
configurations specific to the appropriate VLANs. If you have already supplied
configuration information using the main configuration menus, that information
applies to VLAN "default". Virtual LANs affects other switch features in the
following ways:
•
Spanning Tree Protocol (STP). If you are using STP in a certain domain, you
must supply STP information for that domain. The STP software treats ports
on other domains as nonexistent. Domains do not affect port priorities and port
costs. You set these parameters using the STP Configuration menu that you
select from the main Configuration menu.
•
SNMP trap tables. Each domain appears to the network management system
as a physically different Token-Ring switch unit. Certain MIB II objects and
proprietary objects are domain-sensitive, while others are not. For a list of
domain-sensitive objects, see Chapter 4, "Monitoring the Network from the
Statistics Menu".
•
IP. You may give each domain an IP address, subnet mask, and gateway
address definition.
CrossFire 8730 Switch Reference Guide, DOC-7047 v. 1.1
STACK-LINK
STATUS
FAULT
21-22
TX
RX
ATTACH
PWR
DIAG
ERR
RST
5
6
7
3
4
ACT
ACT
STATUS
100
100
LINK
LINK
FAULT
21
22
25-26
FAST ETHERNET
8
9
10
11
12
13
VLAN 2
Ports 5, 11, 12
CrossFire 8730
Fast Ethernet Translation Switch
VLAN 4
ACT
Ports 6, 8, 13, 14
100
LINK
25
26
14
15
16
17
18
19
Switch Configuration
ACT
100
LINK
20
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