Cisco Catalyst 2900 Series XL Especificaciones descargar pdf (Pagina 195)

8-3

Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide

78-6511-06

Chapter 8 Configuring VLANs

Management VLANs

The switches in Table 8-1 support both Inter-Switch Link (ISL) and IEEE 802.1Q trunking methods for

transmitting VLAN traffic over 100BASE-T and Gigabit Ethernet ports.

The GigaStack GBIC also supports both trunking methods. When you are configuring a cascaded stack

of Catalyst 3500 XL switches using the GigaStack GBIC and want to include more than one VLAN in

the stack, be sure to configure all of the GigaStack GBIC interfaces as trunk ports by using the

switchport mode trunk interface configuration command and to use the same encapsulation method by

using the switchport encapsulation {isl | dot1q} interface configuration command. For more

information on these commands, refer to the Catalyst 2900 Series XL and Catalyst 3500 Series XL

Command Reference.

Trunking is supported on all 8-MB switches running Cisco IOS 12.0(5)XP and later. Trunking is not

supported on some older software releases and on some older Catalyst 2900 XL switches and modules.

For information about which older devices and software releases support trunking, refer to the release

notes for Release 11.2(8)SA6 or earlier

(http://www.cisco.com/univercd/cc/td/doc/product/lan/c2900xl/index.htm).

Management VLANs

Communication with the switch management interfaces is through the switch IP address. The IP address

is associated with the management VLAN, which by default is VLAN 1.

The management VLAN has these characteristics:

• It is created from CMS or through the CLI on static-access, multi-VLAN, and dynamic-access and

trunk ports. You cannot create or remove the management VLAN through Simple Network

Management Protocol (SNMP).

• Only one management VLAN can be administratively active at a time.

• With the exception of VLAN 1, the management VLAN can be deleted.

• When created, the management VLAN is administratively down.

Before changing the management VLAN on your switch network, make sure you follow these

guidelines:

• The new management VLAN should not have an Hot Standby Router Protocol (HSRP) standby

group configured on it.

• You must be able to move your network management station to a switch port assigned to the same

VLAN as the new management VLAN.

• Connectivity through the network must exist from the network management station to all switches

involved in the management VLAN change.

• Switches running a version of IOS software that is earlier than Cisco IOS 12.0(5)XP cannot change

the management VLAN.

• Switches running Cisco IOS 12.0(5)XP should be upgraded to the current software release as

described in the release notes

(http://www.cisco.com/univercd/cc/td/doc/product/lan/c2900xl/index.htm).

If you are using SNMP or CMS to manage the switch, ensure that the port through which you are

connected to a switch is in the management VLAN.

For information about the role management VLANs play in switch clusters, see the “Management

VLAN” section on page 5-16.

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