Key Guidelines For Implementing Ip Routing; Configure Trunks (Optional); Configure Ip Vlans (Vlan-Based Routing) - 3Com corebuilder 3500 Implementation Manual

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HAPTER NTERNET
Key Guidelines for
Implementing IP
Routing
Configure Trunks
(Optional)
Configure IP VLANs
(VLAN-based
Routing)
P (IP)
ROTOCOL
To route network traffic using IP, you must perform these tasks in the
following order:

1 Configure trunks (optional).

2 Configure IP VLANs (VLAN-based routing).

3 Establish your IP interface.
4 Enable IP routing.
Trunks (also known as aggregated links) work at Layer 2 and allow you to
combine multiple Fast Ethernet, Gigabit Ethernet, or FDDI ports into a
single high-speed link between two switches.
If you intend to use trunking on an IP device, configure your trunks
before you set up VLANs and IP interfaces. In this case, you must specify
the anchor port (the lowest-numbered port) to associate with the trunk.
For example, if ports 7 through 12 are associated with a trunk, specifying
7 to 12 defines the VLAN to include all of the physical ports in the trunk
(ports 7 through 12).
For more information about trunking, see Chapter 8.
If you want to use VLAN-based routing, you must first configure the
VLAN to use IP. An IP VLAN is called a protocol-based VLAN.
Protocol-based VLANs such as IP VLANs group one or more switch ports
together for one or more specified Layer 3 protocols. (You can also create
network-based VLANs which are IP VLANs grouped according to the IP
network address and mask.)
If you want to use port-based routing, you do not have to explicitly
configure a VLAN; the VLAN index is created automatically when you
define the IP interface.
See Chapter 9 in this guide to learn more about VLANs.