Sun Cluster 3.1 - 3.2 Hardware Administration Manual for Solaris OS

Configuring VLANs as Private Interconnect Networks

Sun Cluster software supports the use of private interconnect networks over switch-based virtual local area networks (VLANs). In a switch-based VLAN environment, Sun Cluster software enables multiple clusters and nonclustered systems to share an Ethernet transport junction (switch) in two different configurations.

Note –

Even if clusters share the same switch, create a separate VLAN for each cluster.

By default, Sun Cluster uses the same set of IP addresses on the private interconnect. Creating a separate VLAN for each cluster ensures that IP traffic from one cluster does not interfere with IP traffic from another cluster. Unless you have customized the default IP address for the private interconnect, as described in How to Change the Private Network Address or Address Range of an Existing Cluster in Sun Cluster System Administration Guide for Solaris OS, create a separate VLAN for each cluster.

The implementation of switch-based VLAN environments is vendor-specific. Because each switch manufacturer implements VLAN differently, the following guidelines address Sun Cluster software requirements with regard to configuring VLANs with cluster interconnects.

The first VLAN configuration enables nodes from multiple clusters to send interconnect traffic across one pair of Ethernet transport junctions. Sun Cluster software requires a minimum of one transport junction, and each transport junction must be part of a VLAN that is located on a different switch. The following figure is an example of the first VLAN configuration in a two-node cluster. VLAN configurations are not limited to two-node clusters.

Figure 3–7 First VLAN Configuration

 Illustration: The preceding context describes the graphic.

The second VLAN configuration uses the same transport junctions for the interconnect traffic of multiple clusters. However, the second VLAN configuration has two pairs of transport junctions that are connected by links. This configuration enables VLANs to be supported in a campus cluster configuration with the same restrictions as other campus cluster configurations. The following figure illustrates the second VLAN configuration.

Figure 3–8 Second VLAN Configuration

 Illustration: The preceding context describes the graphic.