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brctl showbr bzhp0
Port Path Cost
Each port has an associated cost that contributes to the total cost of the path to the Root Bridge
when the port is the root port. The smaller the cost, the better the path. The Ethernet Switch Blade
uses the following IEEE 802.1D recommendations based on the connection speed of your port:
Port Path Cost
Link
Speed
Recommended
Value
Recommended Range
10 Mb/s 100 50-600
100 Mb/s 19 10-60
1 Gb/s 4 3-10
Table 7.1: Port Path Cost
To change the port path, use the brctl setpathcost option. For example, to set the port
priority to a value consistent with a gigabit interface,
brctl setpathcost bzhp0 zre1 4
Layer 3 Switch Configuration
The previous section outlines the Layer 2 switch configuration that is automatically configured
when you initially bring up the OpenArchitect switch. In order to communicate between Layer2
interfaces, you must properly setup routing.
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 with Layer 2 switching. Layer3 routing information is then used to route
between the Layer2 network devices.
Take a simple example of two VLANs configured on the switch, each with four ports. First
teardown any existing configuration,
zconfig –t
Use zconfig to create two new VLANs, each with four ports, and untag them,
zconfig zhp0: vlan1=zre1..4
zconfig zre1..4=untag1
Ethernet Switch Blade User's Guide release 3.2.2j page 97