Understanding How Vlans Work; Vlan Ranges - Cisco WS-X6066-SLB-APC - Content Switching Module Software Manual

Understanding How VLANs Work

Figure 11-1 VLANs as Logically Defined Networks
Cisco router
VLANs are often associated with IP subnetworks. For example, all the end stations in a particular IP
subnet belong to the same VLAN. Traffic between VLANs must be routed. Port VLAN membership on
the switch is assigned manually on a port-by-port basis. When you assign switch ports to VLANs using
this method, it is known as port-based, or static, VLAN membership.
The in-band (sc0) interface of a switch can be assigned to any VLAN, so you can access another switch
on the same VLAN directly without a router. Only one IP address at a time can be assigned to the in-band
interface. If you change the IP address and assign the interface to a different VLAN, the previous IP
address and VLAN assignment are overwritten.

VLAN Ranges

Catalyst 6000 family switches support 4096 VLANs in accordance with the IEEE 802.1Q standard.
These VLANs are organized into several ranges; you use each range slightly differently. Some of these
VLANs are propagated to other switches in the network when you use a management protocol, such as
the VLAN Trunking Protocol (VTP). Other VLANs are not propagated and you must configure them on
each applicable switch.
There are three ranges of VLANs:
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•
•
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
11-2
Fast
Ethernet
Normal-range VLANs: 1–1000
Extended-range VLANs: 1025–4094
Reserved-range VLANs: 0, 1002–1024, 4095
Engineering Marketing
VLAN VLAN
Chapter 11 Configuring VLANs
Accounting
VLAN
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