HP Cisco Catalyst Blade Switch 3020 Cisco Catalyst Blade Switch 3020 for HP So - Page 255
Default Layer 2 Ethernet Interface VLAN Configuration
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Chapter 10 Configuring VLANs Configuring VLAN Trunks • Make sure the native VLAN for an IEEE 802.1Q trunk is the same on both ends of the trunk link. If the native VLAN on one end of the trunk is different from the native VLAN on the other end, spanning-tree loops might result. • Disabling spanning tree on the native VLAN of an IEEE 802.1Q trunk without disabling spanning tree on every VLAN in the network can potentially cause spanning-tree loops. We recommend that you leave spanning tree enabled on the native VLAN of an IEEE 802.1Q trunk or disable spanning tree on every VLAN in the network. Make sure your network is loop-free before disabling spanning tree. Default Layer 2 Ethernet Interface VLAN Configuration Table 10-6 shows the default Layer 2 Ethernet interface VLAN configuration. Table 10-6 Default Layer 2 Ethernet Interface VLAN Configuration Feature Default Setting Interface mode switchport mode dynamic auto Trunk encapsulation switchport trunk encapsulation negotiate Allowed VLAN range VLANs 1 to 4094 VLAN range eligible for pruning VLANs 2 to 1001 Default VLAN (for access ports) VLAN 1 Native VLAN (for IEEE 802.1Q trunks) VLAN 1 Configuring an Ethernet Interface as a Trunk Port Because trunk ports send and receive VTP advertisements, to use VTP you must ensure that at least one trunk port is configured on the switch and that this trunk port is connected to the trunk port of a second switch. Otherwise, the switch cannot receive any VTP advertisements. These sections contain this configuration information: • Interaction with Other Features, page 10-17 • Defining the Allowed VLANs on a Trunk, page 10-19 • Changing the Pruning-Eligible List, page 10-20 • Configuring the Native VLAN for Untagged Traffic, page 10-21 Interaction with Other Features Trunking interacts with other features in these ways: • A trunk port cannot be a secure port. • Trunk ports can be grouped into EtherChannel port groups, but all trunks in the group must have the same configuration. When a group is first created, all ports follow the parameters set for the first port to be added to the group. If you change the configuration of one of these parameters, the switch propagates the setting you entered to all ports in the group: - allowed-VLAN list. - STP port priority for each VLAN. OL-8915-01 Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide 10-17
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