Administering VLANs

This chapter describes how to display information about and configure VLANs, in these sections:

• Displaying VLAN Information

• Defining VLAN Information

• Modifying VLAN Information

• Removing a VLAN Definition

You can display a summary of VLAN information or a detailed report. When you display a summary, you receive information about the protocols and ports assigned to each VLAN, plus the Layer 3 addresses that are used to manage flood domains for overlapping IP subnetworks. The detailed VLAN report includes the summary information plus additional utilization statistics.

To display VLAN information, f rom the top level of the Administration Console, enter:

bridge vlan summary

or

bridge vlan detail

The VLAN information appears in the format that you specified.

The following sample shows a summary display for several VLANs:

The following sample shows a detailed display for these VLANs:

Table 9-1 describes these statistics.

Table 9-1 Field Attributes for VLAN Information

Field	Description
Index	A system-assigned index that identifies a VLAN
Protocol	The protocol suite of the VLAN
Identifier	A unique, user-defined (4-byte) integer for use by global management operations
Ports	The numbers of the ports that are assigned to the VLAN
Name	A 16-byte character string that identifies the members of the VLAN
Layer 3	Optional parameters (consisting of IP subnetwork and mask) that are used to set up flood domains for overlapping IP VLAN subnetworks
inPackets	The number of flooded packets that are received on the VLAN
inBytes	The number of flooded bytes that are received on the VLAN
outPackets	The number of flooded packets that are transmitted over the VLAN
outBytes	The number of flooded bytes that are transmitted over the VLAN

To create a VLAN definition:

1 .   From the top level of the Administration Console, enter:

bridge vlan define

2 .   Enter the appropriate protocol: (IP, IPX, Apple, XNS, DECnet, SNA, Vines, X.25, NetBIOS, default)

3 .   Enter the integer of the VLAN interface identifier.

4 .   Enter the VLAN name. The system displays the port types.

5 .   Enter the numbers of the ports to assign to the VLAN or all to assign all ports to the VLAN.

• If you did not choose the IP protocol, you are finished.

• If you chose the IP protocol, proceed to steps 6 and 7.

6 .   To use Layer 3 subnetwork addressing, enter defined and proceed to step 8. If you do not want to use Layer 3 subnetwork addressing, enter undefined and you are finished.

7 .   Enter the IP subnetwork address.

8 .   Enter the subnet mask.

Example:

Select menu option (bridge/vlan): define

Enter Protocol Suite (IP,IPX,Apple,XNS,DECnet,SNA,

Vines,X.25,NetBIOS,default): IP

Enter Integer VLAN Identifier: 1

Enter VLAN Name: SD Marketing

Ports 1-2=FDDI, 3-18=Ethernet

Enter port(s) (1-18|all): 1,3-5

Layer 3 Address (undefined, defined): defined

Enter IP Subnet Address: 158.111.122.0

Enter subnet mask [255.255.0.0] 255.255.255.0

You can define up to 32 VLANs on a single bridge. The CoreBuilder 2500 VLAN database allows up to 16 simultaneous VLAN protocols and reserves the first seven database entries for default, IP, IPX, and AppleTalk VLANs. The XNS and DEC protocols use three and five of the nine remaining entries, respectively. If you define DEC and XNS, plus two additional SNA, VINES, X25, or NetBIOS protocols, you receive a message that the system's database resources are exhausted.

To modify VLAN information:

1 .   From the top level of the Administration Console, enter:

bridge vlan modify

2 .   Enter the number of the VLAN interface index.

3 .   Enter the protocol for that VLAN: (IP, IPX, Apple, XNS, DECnet, SNA, Vines, X.25, NetBIOS, default).

4 .   Enter the VLAN identifier.

5 .   Enter the VLAN name.

The system displays the port types.

6 .   Enter the numbers of the ports to modify or all to modify all ports on the VLAN.

7 .   If you have selected the IP protocol and want to use the Layer 3 address information, enter defined

If you do not want Layer 3 addressing, enter undefined

Example:

Select menu option (bridge/vlan): modify

Select VLAN interface [1-2]: 2

Protocol Suite (IP,IPX,Apple,XNS,DECnet,SNA,
Vines,X.25,NetBIOS,default): IP

Integer VLAN Identifier [1]: 2

VLAN Name [Sales]:

Ports 1=FDDI, 2-17=FastEthernet

Enter port(s) (1-17|all) [1-5]:

Layer 3 Address (undefined,defined) [undefined]:

To remove a VLAN definition:

1 .   From the top level of the Administration Console, enter:

bridge vlan remove

2 .   Enter the indexes for the VLANs that you want to remove.

Example:

Select menu option (bridge/vlan): remove

Select VLAN index(es) (1-2|all): 1