Specifications

Virtual LANS Features Roadmap
2
Table 1 Supported Network Address Translation Features
Release Feature Name Feature Description Where Documented
Cisco IOS Releases 12.0, 12.1, 12.2, 12.3, and 12.3T
12.0(7)XE
12.1(5)T
12.2(2)DD
12.2(4)B
12.2(8)T
12.2(13)T
VLAN Range Using the VLAN Range feature, you can group
VLAN subinterfaces together so that any command
entered in a group applies to every subinterface
within the group. This capability simplifies
configurations and reduces command parsing.
Configuring
Routing Between VLANs
• Configuring a Range
of VLAN
Subinterfaces,
page 323
Configuring Routing
Between VLANs with
IEEE 802.1Q
Encapsulation
The IEEE 802.1Q protocol is used to interconnect
multiple switches and routers, and for defining
VLAN topologies. The IEEE 802.1Q standard is
extremely restrictive to untagged frames. The
standard provides only a per-port VLANs solution
for untagged frames. For example, assigning
untagged frames to VLANs takes into consideration
only the port from which they have been received.
Each port has a parameter called a permanent virtual
identification (Native VLAN) that specifies the
VLAN assigned to receive untagged frames.
Configuring
Routing Between VLANs
• Configuring Routing
Between VLANs with
IEEE 802.1Q
Encapsulation
Configuring Routing
Between VLANs with
Inter-Switch Link
Encapsulation
ISL is a Cisco protocol for interconnecting multiple
switches and maintaining VLAN information as
traffic goes between switches. ISL provides VLAN
capabilities while maintaining full wire speed
performance on Fast Ethernet links in full- or
half-duplex mode. ISL operates in a point-to-point
environment and will support up to 1000 VLANs.
You can define virtually as many logical networks as
are necessary for your environment.
Configuring
Routing Between VLANs
• Configuring Routing
Between
VLANs with
Inter-Switch Link
Encapsulation
Configuring Routing
Between VLANs with
IEEE 802.10
Encapsulation
AppleTalk can be routed over VLAN subinterfaces
using the ISL or IEEE 802.10 VLANs feature that
provides full-feature Cisco IOS software AppleTalk
support on a per-VLAN basis, allowing standard
AppleTalk capabilities to be configured on VLANs.
Configuring
Routing Between VLANs
• Configuring Routing
Between VLANs with
IEEE 802.10
Encapsulation