Host Mask; F.3.5 Host Mask; Configuring A Virtual Router With Ospf - Novell BUSINESS CONTINUITY CLUSTERING 1.2.1 - ADMINISTRATION Administration Manual

F.3.5 Host Mask

To use a virtual IP address in a business continuity cluster, we recommend using a host mask. To
understand why, consider the fact that each service in a clustered environment must have its own
unique IP address, or a unique virtual IP address. Furthermore, consider that each virtual IP address
belongs to a virtual IP network whose route is being advertised by a single node within a cluster.
Because Novell Cluster Services™ can migrate a service and its virtual IP address from one node to
another, the virtual IP network must migrate to the same node as the service. If multiple virtual IP
addresses belong to a given virtual IP network, one of two events must occur:
All services associated with the virtual IP addresses on a given virtual IP network must fail
over together.
The virtual IP addresses on a given virtual IP network must go unused, thereby wasting a
portion of the available address space.
Neither of these situations is desirable. Fortunately, the use of host masks remedies both.
F.4 Configuring a Virtual Router with OSPF
Perform the following procedure for each node in every peer cluster:
®
1 Use YaST to add a Dummy Device to the node.
This creates a virtual network device named
2 In YaST, use the Software Installer to install the Quagga Routing Software Suite package.
3 Edit the configuration files for the Quagga Routing Software Suite.
For information, see the
www.quagga.net/docs.php).
3a In a text editor, configure
fields:
Hostname
Password (optional)
Physical and virtual interface
Log file (optional)
3b In a text editor, configure
fields:
Hostname
Password (optional)
Physical and virtual interface
OSPF area ID
Log file (optional)
3c In a text editor, configure
dummy0
Quagga Routing Software Suite Documentation Web site (http://
/etc/quagga/zebra.conf
/etc/quagga/ospfd.conf
.
/etc/services
.
to specify values for the following
to specify values for the following
Using Virtual IP Addresses with BCC 1.2 171