HP 6120XG HP ProCurve Series 6120 Blade Switches Advanced Traffic Management G - Page 73
Special VLAN Types, VLAN Support and the Default VLAN, The Primary VLAN
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Static Virtual LANs (VLANs) Special VLAN Types Special VLAN Types VLAN Support and the Default VLAN In the factory default configuration, VLAN support is enabled and all ports on the switch belong to the port-based, default VLAN (named DEFAULT_VLAN). This places all ports in the switch into one physical broadcast domain. In the factory-default state, the default VLAN is also the Primary VLAN. You can partition the switch into multiple virtual broadcast domains by configuring one or more additional VLANs and moving ports from the default VLAN to the new VLANs. (The HP 6120G/XG switch supports up to 256 static and dynamic VLANs and the HP 6120XG switch supports up to 1024 (vids numbered up to 4094) static and dynamic VLANs.) You can change the name of the default VLAN, but you cannot change the default VLAN's VID (which is always "1"). Although you can remove all ports from the default VLAN (by placing them in another port-based VLAN), this VLAN is always present; that is, you cannot delete it from the switch. For details on port VLAN settings, refer to "Configuring Static VLAN Per-Port Settings" on page 2-39 The Primary VLAN Because certain features and management functions run on only one VLAN in the switch, and because DHCP and Bootp can run per-VLAN, there is a need for a dedicated VLAN to manage these features and ensure that multiple instances of DHCP or Bootp on different VLANs do not result in conflicting configuration values for the switch. The Primary VLAN is the VLAN the switch uses to run and manage these features and data. In the factory-default configuration, the switch designates the default VLAN (DEFAULT_VLAN; VID = 1) as the Primary VLAN. However, to provide more control in your network, you can designate another static, port-based VLAN as primary. To summarize, designating a non-default VLAN as primary means that: ■ The switch reads DHCP responses on the Primary VLAN instead of on the default VLAN. (This includes such DHCP-resolved parameters as the TimeP server address, Default TTL, and IP addressing-including the Gateway IP address-when the switch configuration specifies DHCP as the source for these values.) ■ The default VLAN continues to operate as a standard VLAN (except, as noted above, you cannot delete it or change its VID). 2-47