Contents
xv
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
OL-10101-02
Enabling Root Guard 15-20
Enabling Loop Guard 15-20
Displaying the Spanning-Tree Status 15-21
CHAPTER
16 Configuring VLANs 16-1
Understanding VLANs 16-1
Supported VLANs 16-2
VLAN Port Membership Modes 16-3
Configuring Normal-Range VLANs 16-4
Token Ring VLANs 16-5
Normal-Range VLAN Configuration Guidelines 16-5
VLAN Configuration Mode Options 16-6
VLAN Configuration in config-vlan Mode 16-6
VLAN Configuration in VLAN Configuration Mode 16-6
Saving VLAN Configuration 16-6
Default Ethernet VLAN Configuration 16-7
Creating or Modifying an Ethernet VLAN 16-8
Deleting a VLAN 16-9
Assigning Static-Access Ports to a VLAN 16-10
Configuring Extended-Range VLANs 16-11
Default VLAN Configuration 16-11
Extended-Range VLAN Configuration Guidelines 16-11
Creating an Extended-Range VLAN 16-12
Displaying VLANs 16-13
Configuring VLAN Trunks 16-13
Trunking Overview 16-14
IEEE 802.1Q Configuration Considerations 16-15
Default Layer 2 Ethernet Interface VLAN Configuration 16-16
Configuring an Ethernet Interface as a Trunk Port 16-16
Interaction with Other Features 16-16
Configuring a Trunk Port 16-17
Defining the Allowed VLANs on a Trunk 16-18
Changing the Pruning-Eligible List 16-19
Configuring the Native VLAN for Untagged Traffic 16-19
Load Sharing Using STP 16-20
Load Sharing Using STP Port Priorities 16-20
Load Sharing Using STP Path Cost 16-22