Specifications

Configuring Routing Between VLANs
How to Configure Routing Between VLANS
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VLAN Translation
VLAN translation refers to the ability of the Cisco IOS software to translate between different VLANs
or between VLAN and non-VLAN encapsulating interfaces at Layer 2. Translation is typically used for
selective inter-VLAN switching of nonroutable protocols and to extend a single VLAN topology across
hybrid switching environments. It is also possible to bridge VLANs on the main interface; the VLAN
encapsulating header is preserved. Topology changes in one VLAN domain do not affect a different
VLAN.
Designing Switched VLANs
By the time you are ready to configure routing between VLANs, you will have already defined them
through the switches in your network. Issues related to network design and VLAN definition should be
addressed during your network design. Refer to the Cisco Internetworking Design Guide and appropriate
switch documentation for information on these topics:
• Sharing resources between VLANs
• Load balancing
• Redundant links
• Addressing
• Segmenting networks with VLANs—Segmenting the network into broadcast groups improves
network security. Use router access lists based on station addresses, application types, and protocol
types.
• Routers and their role in switched networks—In switched networks, routers perform broadcast
management, route processing, and distribution, and provide communication between VLANs.
Routers provide VLAN access to shared resources and connect to other parts of the network that are
either logically segmented with the more traditional subnet approach or require access to remote
sites across wide-area links.
How to Configure Routing Between VLANS
This section contains the following configuration procedure groups:
• Configuring a VLAN Range, page 12
• Configuring Routing Between VLANs with Inter-Switch Link Encapsulation
• Configuring Routing Between VLANs with IEEE 802.10 Encapsulation
• Configuring Routing Between VLANs with IEEE 802.1Q Encapsulation
• Configuring IEEE 802.1Q-in-Q VLAN Tag Termination
Configuring a 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.