Administrator Guide

Member VLAN Spanning Two Rings Connected by One
Switch
A member VLAN can span two rings interconnected by a common switch, in a figure-eight style topology.
A switch can act as a Master node for one FRRP group and a Transit for another FRRP group, or it can be a
Transit node for both rings.
In the following example, FRRP 101 is a ring with its own Control VLAN, and FRRP 202 has its own Control
VLAN running on another ring. A Member VLAN that spans both rings is added as a Member VLAN to both
FRRP groups. Switch R3 has two instances of FRRP running on it: one for each ring. The example topology
that follows shows R3 assuming the role of a Transit node for both FRRP 101 and FRRP 202.
Figure 38. Multiple Rings Connected by a Single Switch Example
Force10 Resilient Ring Protocol (FRRP) 362