Brocade TurboIron 24X Series Configuration Guide - Manual (Page 312)

278 Brocade TurboIron 24X Series Configuration Guide
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Metro Ring Protocol (MRP)
Figure 7 shows an example of an MRP metro ring.
FIGURE 7 Metro ring – normal state
The ring in this example consists of four MRP nodes. Each node has two interfaces with the ring.
Each node also is connected to a separate customer network. The nodes forward Layer 2 traffic to
and from the customer networks through the ring. The ring interfaces are all in one port-based
VLAN. Each customer interface can be in the same VLAN as the ring or in a separate VLAN.
One node is configured as the master node of the MRP ring. One of the two interfaces on the
master node is configured as the primary interface; the other is the secondary interface. The
primary interface originates Ring Health Packets (RHPs), which are used to monitor the health of
the ring. An RHP is forwarded on the ring to the next interface until it reaches the secondary
interface of the master node. The secondary interface blocks the packet to prevent a Layer 2 loops.
When the master node transmits or receives RHPs, the CPU goes high on the master node.
F
F F
Customer A
Switch B
Customer A
Customer A
Customer A
Switch A
Switch C
Switch D
Master
Node
B
F
F
F
F
F
F
F
F
This interface blocks
Layer 2 traffic
to prevent a loop