Protocol-Based Vlans; Configuration Example - Dell PowerConnect B-FCXs Configuration Manual

13
Configuring IP subnet, IPX network and protocol-based VLANs
To configure a specific path-cost or priority value for a given port, enter those values using the key
words in the brackets [ ] shown in the syntax summary below. If you do not want to specify values
for any given port, this portion of the command is not required.
Syntax: vlan <vlan-id> by port
Syntax: [no] spanning-tree
Syntax: spanning-tree [ethernet [<slotnum>/]<portnum> path-cost <value> priority <value>]
Bridge STP parameters (applied to all ports within a VLAN):
•
•
•
•
Port parameters (applied to a specified port within a VLAN):
•
•
Configuring IP subnet, IPX network and

protocol-based VLANs

Protocol-based VLANs provide the ability to define separate broadcast domains for several unique
Layer 3 protocols within a single Layer 2 broadcast domain. Some applications for this feature
might include security between departments with unique protocol requirements. This feature
enables you to limit the amount of broadcast traffic end-stations, servers, and routers need to
accept.

Configuration example

Suppose you want to create five separate Layer 3 broadcast domains within a single Layer 2 STP
broadcast domain:
•
•
•
Also suppose you want a single router interface to be present within all of these separate broadcast
domains, without using IEEE 802.1Q VLAN tagging or any proprietary form of VLAN tagging.
Figure 96
452
forward-delay <value> hello-time <value> maximum-age <time> priority <value>
Forward Delay – the period of time a bridge will wait (the listen and learn period) before
forwarding data packets. Possible values: 4 – 30 seconds. Default is 15.
Maximum Age – the interval a bridge will wait for receipt of a hello packet before initiating a
topology change. Possible values: 6 – 40 seconds. Default is 20.
Hello Time – the interval of time between each configuration BPDU sent by the root bridge.
Possible values: 1 – 10 seconds. Default is 2.
Priority – a parameter used to identify the root bridge in a network. The bridge with the lowest
value has the highest priority and is the root. Possible values: 1 – 65,535. Default is 32,678.
Path Cost – a parameter used to assign a higher or lower path cost to a port. Possible values: 1
– 65535. Default is (1000/Port Speed) for Half-Duplex ports and is (1000/Port Speed)/2 for
Full-Duplex ports.
Priority – value determines when a port will be rerouted in relation to other ports. Possible
values: 0 – 255. Default is 128.
Three broadcast domains, one for each of three separate IP subnets
One for IPX Network 1
One for the Appletalk protocol
shows this configuration.
PowerConnect B-Series FCX Configuration Guide
53-1002266-01