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Tagging and Untagging VLANs
The OpenArchitect switch is capable of switching VLAN tagged and untagged data packets.
VLAN tagged packets conform to the 802.1q specification and the packet header contains an
additional four bytes of VLAN tag information. A given port can be specified to accept VLAN
tagged or untagged traffic. Internally, all traffic for a particular VLAN is treated as tagged traffic.
Switch Port Interfaces
For each switch port, OpenArchitect creates a separate interface with its own MAC address called
a ZNYX raw Ethernet (
zre
). After the initial power up, 24
zre
interfaces are created, one for
each in band port. You cannot directly access or modify the
zre
interfaces.
During the initial power up of the switch, the default configuration creates a Layer 2 switch. The
Layer 2 configuration places all of the zre interfaces in the same
zhp
interface. The number
after zre represents the corresponding switch port number (that is, zre1 represents port 1 on the
switch).
Layer 2 Switch Configuration
The steps to build a Layer 2 switch involve creating a group of switch ports in a VLAN (or Layer
2 switching domain) and bringing that interface up. zconfig creates the VLAN group of switch
ports as well as a network interface. Use ifconfig(1M) on the network interface to bring up
the VLAN group. Figure 7.2 provides an illustration of a Layer 2 Switch connection.
Ethernet Switch Blade User's Guide release 3.2.2j page 94
Figure 7.1: Multiple VLANs