Static Virtual LANs (VLANs)

Port-Based Virtual LANs (Static VLANs)

links are in separate VLANs. However, you can use port trunking to prevent Spanning Tree from unnecessarily blocking ports (and to improve overall network performance). Refer to “RSTP and STP Operation with 802.1Q VLANs” on page 5-9.

Note that Spanning Tree operates differently in different devices. For exam­ ple, in the (obsolete, non-802.1Q) ProCurve Switch 2000 and the ProCurve Switch 800T, Spanning Tree operates on a per-VLAN basis, allowing redundant physical links as long as they are in separate VLANs.

IP Interfaces

There is a one-to-one relationship between a VLAN and an IP network inter­ face. Since the VLAN is defined by a group of ports, the state (up/down) of those ports determines the state of the IP network interface associated with that VLAN. When a VLAN comes up because one or more of its ports is up, the IP interface for that VLAN is also activated. Likewise, when a VLAN is deactivated because all of its ports are down, the corresponding IP interface is also deactivated.

VLAN MAC Addresses

Some switch models use the same MAC address for all configured VLANs, while other switch models use a different MAC address for each configured VLAN.

One (Same) MAC Address for all VLANs

Different MAC Address for Each VLAN

 

 

 

2600

3400cl

4100gl

2600-PWR

5300xl

6108

2610

6400cl

 

2610-PWR

 

 

2800

 

 

 

 

 

You can send an 802.2 test packet to the VLAN MAC address to verify connectivity to the switch. Likewise, you can assign an IP address to the VLAN interface, and when you Ping that address, ARP will resolve the IP address to this MAC address. (Refer to table 2-1on page 2-4for the maximum number of VLANs allowed on your switch).

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