Reference Guide

368 | Force10 Resilient Ring Protocol (FRRP)
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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 example shown below, 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 17-2. Example of Multiple Rings Connected by Single Switch
Primary
Forwarding
Primary
Forwarding
Secondary
Forwarding
Primary
Forwarding
Secondary
Blocking
Secondary
Forwarding
TRANSIT
R2
TRANSIT
R3
FRRP 101
MASTER
R1
TRANSIT
R3
Primary
Forwarding
Primary
Forwarding
Primary
Forwarding
Primary
Forwarding
Primary
Forwarding
Secondary
Forwarding
Secondary
Forwarding
Secondary
Forwarding
Secondary
Forwarding
Secondary
Blocking
FRRP 202
MASTER
R5
Ring 202
Direction
TRANSIT
R4
TRANSIT
R6
TRANSIT
R7
Ring 101
Direction