Switches only) – Brocade FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide User Manual
Page 381
You can add the VLAN ports as static ports or dynamic ports. A static port is always an active member
of the VLAN. Dynamic ports within any protocol VLAN age out after 10 minutes if no member protocol
traffic is received on a port within the VLAN. The aged out port, however, remains as a candidate
dynamic port for that VLAN. The port becomes active in the VLAN again if member protocol traffic is
received on that port.
Once a port is re-activated, the aging out period for the port is reset to 20 minutes. Each time a member
protocol packet is received by a candidate dynamic port (aged out port) the port becomes active again
and the aging out period is reset for 20 minutes.
NOTE
You can disable VLAN membership aging of dynamically added ports. Refer to
on page 387).
To configure an IPv6 VLAN, enter commands such as the following.
device(config)# vlan 2
device(config-vlan-2)# untagged ethernet 1/1 to 1/8
device(config-vlan-2)# ipv6-proto name V6
device(config-ipv6-subnet)# static ethernet 1/1 to 1/6
device(config-ipv6-subnet)# dynamic
The first two commands configure a port-based VLAN and add ports 1/1 - 1/8 to the VLAN. The
remaining commands configure an IPv6 VLAN within the port-based VLAN. The static command adds
ports 1/1 - 1/6 as static ports, which do not age out. The dynamic command adds the remaining ports,
1/7 - 1/8, as dynamic ports. These ports are subject to aging as described above.
Syntax: [no] ipv6-proto [ name string]
Routing between VLANs using virtual routing interfaces (Layer 3
Switches only)
Brocade Layer 3 Switches offer the ability to create a virtual routing interface within a Layer 2 STP port-
based VLAN or within each Layer 3 protocol, IP subnet, or IPX network VLAN. This combination of
multiple Layer 2 or Layer 3 broadcast domains, or both, and virtual routing interfaces are the basis for
Brocade Communication Systems, Inc’ very powerful Integrated Switch Routing (ISR) technology. ISR
is very flexible and can solve many networking problems. The following example is meant to provide
ideas by demonstrating some of the concepts of ISR.
Suppose you want to move routing out to each of three buildings in a network. Remember that the only
protocols present on VLAN 2 and VLAN 3 are IP and IPX. Therefore, you can eliminate tagged ports 25
and 26 from both VLAN 2 and VLAN 3 and create new tagged port-based VLANs to support separate IP
subnets and IPX networks for each backbone link.
You also need to create unique IP subnets and IPX networks within VLAN 2 and VLAN 3 at each
building. This will create a fully routed IP and IPX backbone for VLAN 2 and VLAN 3. However, VLAN 4
has no protocol restrictions across the backbone. In fact there are requirements for NetBIOS and
DecNet to be bridged among the three building locations. The IP subnet and IPX network that exists
within VLAN 4 must remain a flat Layer 2 switched STP domain. You enable routing for IP and IPX on a
virtual routing interface only on FSX-A. This will provide the flat IP and IPX segment with connectivity to
the rest of the network. Within VLAN 4 IP and IPX will follow the STP topology. All other IP subnets and
IPX networks will be fully routed and have use of all paths at all times during normal operation.
The following figure shows the configuration described above.
Routing between VLANs using virtual routing interfaces (Layer 3 Switches only)
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