Foundry Configuration Guide for the FESX, FSX, and FWSX
8 - 6 © Foundry Networks, Inc. December 2005
next interface until it reaches the secondary interface of the master node. The secondary interface blocks the
packet to prevent a Layer 2 loops.
Configuration Notes
• When you configure MRP, Foundry recommends that you disable one of the ring interfaces before beginning
the ring configuration. Disabling an interface prevents a Layer 2 loop from occurring while you are configuring
MRP on the ring nodes. Once MRP is configured and enabled on all the nodes, you can re-enable the
interface.
• MRP I is supported in all FESX, FSX, and FWSX devices and their associated software releases.
• The above configurations are capable of being configured as MRP masters or MRP members (for different
rings).
MRP Rings Without Shared Interfaces (MRP Phase 1)
MRP Phase 1 allows you to configure multiple MRP rings, as shown in Figure 8.2, but the rings cannot share the
same link. For example, you cannot configure ring 1 and ring 2 to each have interfaces 1/1 and 1/2.
Also, when you configure an MRP ring, any node on the ring can be designated as the master node for the ring. A
master node can be the master node of more than one ring. (See Figure 8.2.) Each ring is an independent ring
and RHP packets are processed within each ring.
Figure 8.2 Metro ring – multiple rings
In this example, two nodes are each configured with two MRP rings. Any node in a ring can be the master for its
ring. A node also can be the master for more than one ring.
Ring 3
Ring 2Ring 1
port 4/1
Master
node
port 1/2 port 4/2
port 1/1
Master
node
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