3Com 4007, Implementation Manual, Page: 250 / 684

250 C
HAPTER
14: V
IRTUAL
LAN
S
(VLAN
S
)
■
VLAN name — The name that you assign to the VLAN. It can contain
up to 32 ASCII characters. If the name includes spaces, enclose the
name in quotation marks. The default VLAN always uses the name
Default.
■
Dynamic VLAN configuration — The method that enables dynamic
VLAN configuration of port-based VLANs and dynamic updates of IEEE
802.1Q tagged port-based VLANs, using the GARP VLAN Registration
Protocol (GVRP).
■
Ingress and egress rules — Ingress rules that determine the VLAN to
which an incoming frame belongs. If it cannot be assigned to any
VLAN, it is assigned to the null VLAN, which contains no ports and has
no associated address table in allClosed mode. Egress rules determine
whether the frame is forwarded, flooded, or filtered, as well as the tag
status of the transmitted frame. For more information on ingress and
egress rules, see “Rules of VLAN Operation” later in this chapter.
Key Guidelines for
Implementation
Consider the following guidelines when you configure VLANs on your
Switch 4007 system.
Migration Path for
Network-based
VLANs
On your multi-layer modules, you can either configure network-based IP
VLANs or you can define a single VLAN with the protocol type IP and then
define multiple IP routing interfaces fro that single protocol-based VLAN
(an IP VLAN).
If you decide to convert an existing network-based VLAN to a
protocol-based VLAN that has multiple interfaces associated with it, use
the following procedure:
1 Remove any existing network-based VLANs on your Multilayer Switching
Modules.
2 Define an IP VLAN or a VLAN that supports IP as one of its protocols.
3 Define multiple IP interfaces (with different IP addresses) to use that IP
VLAN. (See Chapter 16.)
You can define up to 32 IP interfaces on each Multilayer Switching
Module, including IP routing interfaces for static VLANs, router port IP
VLANs (described in the next section), or any combination of static VLANs
and router port IP VLANs.