HP Cisco Catalyst Blade Switch 3020 Cisco Catalyst Blade Switch 3020 for HP So - Page 212
Port-Based VLANs, Switch Ports, Internal Gigabit Ethernet Ports
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Understanding Interface Types Chapter 8 Configuring Interface Characteristics Port-Based VLANs A VLAN is a switched network that is logically segmented by function, team, or application, without regard to the physical location of the users. For more information about VLANs, see Chapter 10, "Configuring VLANs." Packets received on a port are forwarded only to ports that belong to the same VLAN as the receiving port. Network devices in different VLANs cannot communicate with one another without a Layer 3 device to route traffic between the VLANs. VLAN partitions provide hard firewalls for traffic in the VLAN, and each VLAN has its own MAC address table. A VLAN comes into existence when a local port is configured to be associated with the VLAN, when the VLAN Trunking Protocol (VTP) learns of its existence from a neighbor on a trunk, or when a user creates a VLAN. To configure normal-range VLANs (VLAN IDs 1 to 1005), use the vlan vlan-id global configuration command to enter config-vlan mode or the vlan database privileged EXEC command to enter VLAN database configuration mode. The VLAN configurations for VLAN IDs 1 to 1005 are saved in the VLAN database. To configure extended-range VLANs (VLAN IDs 1006 to 4094), you must use config-vlan mode with VTP mode set to transparent. Extended-range VLANs are not added to the VLAN database. When VTP mode is transparent, the VTP and VLAN configuration is saved in the switch running configuration, and you can save it in the switch startup configuration file by entering the copy running-config startup-config privileged EXEC command. Add ports to a VLAN by using the switchport interface configuration commands: • Identify the interface. • For a trunk port, set trunk characteristics, and if desired, define the VLANs to which it can belong. • For an access port, set and define the VLAN to which it belongs. Switch Ports Switch ports are Layer 2-only interfaces associated with a physical port. Switch ports belong to one or more VLANs. A switch port can be an access port or a trunk port. You can configure a port as an access port or trunk port or let the Dynamic Trunking Protocol (DTP) operate on a per-port basis to set the switchport mode by negotiating with the port on the other end of the link. Switch ports are used for managing the physical interface and associated Layer 2 protocols. Configure switch ports by using the switchport interface configuration commands. For detailed information about configuring access port and trunk port characteristics, see Chapter 10, "Configuring VLANs." Internal Gigabit Ethernet Ports The Gigabit Ethernet ports 1 to 16 (gibabitethernet0/1 to gibabitethernet0/16) are internal interfaces that provide communication between the switch and the blade server. These interfaces operate at 1000 Mbps, full-duplex, and use the 1000BASE-X protocol. If the Onboard Administrator detects a physical problem between the blade server and the switch, the Onboard Administrator changes these interfaces to the EKEY error-disabled state. You must use the Onboard Administrator to find the root cause of the problem, and to recover from the error-disabled state. See the HP BladeSystem documentation at http://www.hp.com/go/bladesystem/documentation for more information. Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide 8-2 OL-8915-01