3Com 4007, Справочник по командам

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230 C
HAPTER
12: I
NTERNET
P
ROTOCOL
(IP)
Layer 2
Switching
Modules
✓
Multilayer
Switching
Modules
ip interface define Defines an IP interface on a Multilayer Switching Module.
To define an IP interface on a Layer 2 Switching Module, see the “ip
interface define” command next in this chapter.
Valid Minimum Abbreviation
ip i def
Important Considerations
■
When you define an IP interface, you must decide whether you want
the interface to use router port-based routing or VLAN-based routing:
■
Router port-based routing directs the module to attempt to route
the frame before it attempts to bridge the frame. When you set up
a router port-based IP interface, the module automatically creates a
virtual LAN (VLAN) for the interface. The module assigns the next
available VLAN index number to this VLAN.
■
VLAN-based routing directs the module to attempt to bridge the
frame before it attempts to route the frame. When you set up a
VLAN-based IP interface, you must first define a VLAN and select IP
as a protocol supported by the VLAN, as described in Chapter 10.
If you define a router port, you do not have to define the VLAN first; the
corresponding single-port VLAN is automatically defined.
■
Port-based routing uses allClosed mode; VLAN-based routing uses
either allClosed or allOpen mode. If you attempt to set up a router
port-based IP interface in allOpen mode, the module notifies you with
a message that it will change the VLAN mode to allClosed and
recreate the default VLAN, clearing your existing VLANs in the process.
Then the module prompts you to continue.
■
You cannot define a port-based IP interface on a port that is already a
member of a VLAN-based IP interface. To change from one type of
interface to another, you must redefine all IP interfaces and VLANs
that are associated with that port.
CAUTION: Using different routing models (port-based or VLAN-based) in
the same network without careful planning can adversely affect your
network operations. Be sure that you understand the potential effects of
router port-based and VLAN-based routing on your network. See the
Switch 4007 Implementation Guide for detailed information about IP
interfaces and VLANs.