Brocade Communications Systems IP250 user manual Vlan routing, Managing IP addresses on an SVI

27 VLAN routing

The STP Configuration dialog box displays the Available MSTP Instances list.

4.Select an MSTP instance from the list under the Available MSTP Instances list, or enter the MSTP instance number.

5.Click Add.

A new row is added to the Available MSTP Instances list. You can change the bridge priority, which is set, by default, to 32768.

VLAN routing

A VLAN restricts the broadcast domain to only its interface members. If nodes connected to two different VLANs want to communicate, they require an external router to route between the VLANs. Optionally, DCB products offer the ability to create a Switch Virtual Interface (SVI) to route between VLANs.

An SVI is a VLAN of switch ports represented by one interface to a routing or bridging system. There is no physical interface for the VLAN and the SVI provides the Layer 3 processing for packets from all switch ports associated with the VLAN. There is one-to-one mapping between a VLAN and an SVI; therefore, only a single SVI can be mapped to a VLAN. The VLAN is mapped to a network address using the SVI. All the nodes in the VLAN will belong to the subnet of the SVI.

NOTE

An SVI is also called a Virtual Routing Interface (VRI) in IronWare OS terms and Virtual Ethernet (VE) in Network OS terms. The SVI in DCB products, VRI in IronWare OS products, and VE in Network OS products are the same.

Managing IP addresses on an SVI

Switch Virtual Interfaces (SVIs) can be added to port VLANs when you create or modify VLAN definitions. SVIs can only be created in Layer 3 products.

Once VLAN definitions are deployed to products, you can add an IP address to the SVI by completing the following steps.

1. On the VLAN Manager dialog box, complete one of the following tasks:

•Click the VLAN View tab and expand the VLAN node. Select the product that contains the SVI that you want to define. The list of interfaces appears in the interface list. Click the SVI in the list of interfaces to select it.

•On the Product View tab, expand the product or group folders. Expand the products under the folder and select the VLAN that contains an SVI. The list of interfaces appears in the interface list. Click the SVI in the list of interfaces to select it.

NOTE

You must select the Virtual Interface (Port Type) row in the Ports table to enable the IP button.

2.Click the IP button.

The Virtual Port - IP Configuration dialog box displays, as shown in Figure 326. If IP addresses have been configured for the SVI, they are listed in the Selected IP Addresses list.

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