Configuring An Mstp Instance; Configuring Virtual Routing Interfaces - Dell PowerConnect B-RX Configuration Manual

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Configuring virtual routing interfaces

Configuring an MSTP instance

An MSTP instance is configured with an MSTP ID for each region. Each region can contain one or
more VLANs. To configure an MSTP instance and assign a range of VLANs, use a command such as
the following at the Global Configuration level.
BigIron RX(config) # mstp instance 7 vlan 4 to 7
Syntax: [no] mstp instance <instance-number> [ vlan <vlan-id> | vlan-group <group-id> ]
The instance parameter defines the number for the instance of MSTP that you are configuring.
The vlan parameter assigns one or more VLANs or a range of VLANs to the instance defined in this
command.
The vlan-group parameter assigns one or more VLAN groups to the instance defined in this
command.

Configuring virtual routing interfaces

The device sends Layer 3 traffic at Layer 2 within a protocol-based VLAN. However, Layer 3 traffic
from one protocol-based VLAN to another must be routed. If you want the device to be able to send
Layer 3 traffic from one protocol-based VLAN to another on the same router, you must configure a
virtual routing interface on each protocol-based VLAN, then configure routing parameters on the
virtual routing interfaces.
A virtual routing interface is a logical routing interface that the device uses to route Layer 3 protocol
traffic between protocol-based VLANs. It is a logical port on which you can configure Layer 3 routing
parameters.
For example, to enable a device to route IP traffic from one IP protocol VLAN to another, you must
configure a virtual routing interface on each IP protocol VLAN, then configure the appropriate IP
routing parameters on each of the virtual routing interfaces.
For example,
BigIron RX(config)# vlan 2
BigIron RX(config-vlan-2)# tagged e 1/1 to 1/2
BigIron RX(config-vlan-2)# ip-proto
BigIron RX(config-vlan-group-ip-proto)# router-interface ve 1
The device can locally route IP packets between VLANs that are defined within a single router. All
other routable protocols or protocol-based VLANs (for example, IPX and AppleTalk) must be routed
by another external router capable of routing the protocol.
If you do not need to further partition the port-based VLAN into protocol-based VLANs, you can
define a single virtual routing interface at the port-based VLAN level and enable routing on a single
virtual routing interface.
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The static ethernet <slot-number>/<port-number> [to <slot-number>/<port-number>]
parameter adds the specified ports within the port-based VLAN as static ports to the
protocol-based VLAN. Packets of the specified protocol will be forwarded on these ports.
The exclude ethernet <slot-number>/<port-number> [to <slot-number>/<port-number>]
parameter excludes the specified ports from the protocol-based VLAN. Packets of the specified
protocol will be dropped if received on these ports.
BigIron RX Series Configuration Guide
53-1001810-01