Linksets must be used when
some cluster nodes are not physically connected to the external network. In
such a cluster topology, the unconnected cluster nodes use the interfaces
specified in the linkset to communicate with the external network through the
cluster backplane. Linksets are typically used in scenarios when the connecting
devices have insufficient ports to connect the cluster nodes.
Linksets are a mandatory configuration in the following scenarios:
- For deployments that
require MAC-Based Forwarding (MBF).
- To improve manageability
of ACL and L2 policies involving interfaces. You must define a linkset of the
interfaces and add ACL and L2 policies based on linksets.
Linksets must be
configured only through the cluster IP address.
For example, consider a
three node cluster where the upstream switch has only two ports available.
Using linksets, you can connect two nodes to the switch and leave the third
node unconnected. In the following figure, a linkset (LS/1) is formed by
binding the interfaces 0/1/2 and 1/1/2. NS2 is the unconnected node of the
Figure 1. Linksets
The linkset informs NS2
that it can use interfaces 0/1/2 and 1/1/2 to communicate with the network
devices. All traffic to and from NS2 is now routed through interfaces 0/1/2 or
Figure 2. Traffic
distribution flow using linksets