Brocade FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide - Manual (Page 390)

Configuring uplink ports within a port-based VLAN
You can configure a subset of the ports in a port-based VLAN as uplink ports. When you configure
uplink ports in a port-based VLAN, the device sends all broadcast and unknown-unicast traffic from a
port in the VLAN to the uplink ports, but not to other ports within the VLAN. Thus, the uplink ports
provide tighter broadcast control within the VLAN.
This uplink port feature behaves the same as the private VLAN (PVLAN) feature, but with the ability to
support tagged ports. This feature also supports two PVLAN modes: the Primary ports (uplink ports)
and Isolated ports (host ports).
For example, if two ports within a port-based VLAN are Gbps ports attached to the network and the
other ports are 10/100 ports attached to clients, you can configure the two ports attached to the
network as uplink ports. In this configuration, broadcast and unknown-unicast traffic in the VLAN does
not go to all ports. The traffic goes only to the uplink ports. The clients on the network do not receive
broadcast and unknown-unicast traffic from other ports, including other clients.
Configuration considerations for uplink ports within a port-based
VLAN
• When this feature is enabled, flooded traffic (unknown unicast, unregistered multicast, and
broadcast traffic) is software forwarded. ACL-based rate limit is non-functional with uplink switch
configuration.
• This feature should not be enabled with protocol VLANs or PVLANs in the same VLAN.
Configuration syntax for uplink ports within a port-based VLAN
To configure a port-based VLAN containing uplink ports, enter commands such as the following.
device(config)# vlan 10 by port
device(config-vlan-10)# untagged ethernet 1/1 to 1/24
device(config-vlan-10)# untagged ethernet 2/1 to 2/2
device(config-vlan-10)# uplink-switch ethernet 2/1 to 2/2
Syntax: [no] uplink-switch ethernet [slotnum/]portnum [to [slotnum/]portnum | ethernet
[slotnum/]portnum]
In this example, 24 ports on a 10/100 module and two Gbps ports on a Gbps module are added to
port-based VLAN 10. The two Gbps ports are then configured as uplink ports.
IP subnet address on multiple port-based VLANconfiguration
For a Brocade device to route between port-based VLANs, you must add a virtual routing interface to
each VLAN. Generally, you also configure a unique IP subnet address on each virtual routing
interface. For example, if you have three port-based VLANs, you add a virtual routing interface to each
VLAN, then add a separate IP subnet address to each virtual routing interface. The IP address on
each of the virtual routing interfaces must be in a separate subnet. The Brocade device routes Layer 3
traffic between the subnets using the subnet addresses.
Configuring uplink ports within a port-based VLAN
390 FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide
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