HP 6120XG HP ProCurve Series 6120 Blade Switches Advanced Traffic Management G - Page 30
Static VLAN Operation, Table 2-1. Comparative Operation of Port-Based and Protocol-Based VLANs
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Static Virtual LANs (VLANs) Static VLAN Operation Static VLAN Operation A group of networked ports assigned to a VLAN form a broadcast domain that is separate from other VLANs that may be configured on the switch. On a given switch, packets are bridged between source and destination ports that belong to the same VLAN. Thus, all ports passing traffic for a particular subnet address should be configured to the same VLAN. Cross-domain broadcast traffic in the switch is eliminated and bandwidth is saved by not allowing packets to flood out all ports. Table 2-1. Comparative Operation of Port-Based and Protocol-Based VLANs Port-Based VLANs Protocol-Based VLANs IP Addressing Usually configured with at least one unique IP You can configure IP addresses on all protocol address. You can create a port-based VLAN with- VLANs. However, IP addressing is used only on IPv4 out an IP address. However, this limits the switch and IPv6 protocol VLANs. features available to ports on that VLAN. (Refer to The maximum number of IP addresses supported on "How IP Addressing Affects Switch Operation" in a switch is 256. Each IP address that you configure the chapter "Configuring IP Addressing" in the on a VLAN interface must be unique in the switch. Management and Configuration Guide for the switch.) For more information, refer to the chapter on "Configuring IP Addressing" in the Management and You can also use multiple IP addresses to create Configuration Guide. multiple subnets within the same VLAN. (For more on this topic, refer to the chapter on "Configuring IP Addressing" in the Management and Configuration Guide for the switch.) Untagged A port can be a member of one untagged, port- VLAN based VLAN. All other port-based VLAN Membership assignments for that port must be tagged. A port can be an untagged member of one protocol VLAN of a specific protocol type (such as IPX or IPv6). If the same protocol type is configured in multiple protocol VLANs, then a port can be an untagged member of only one of those protocol VLANs. For example, if you have two protocol VLANs, 100 and 200, and both include IPX, then a port can be an untagged member of either VLAN 100 or VLAN 200, but not both VLANs. A port's untagged VLAN memberships can include up to four different protocol types. This means that a port can be an untagged member of one of the following: • Four single-protocol VLANs • Two protocol VLANs where one VLAN includes a single protocol and the other includes up to three protocols • One protocol VLAN where the VLAN includes four protocols 2-7