Brocade FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide - Manual (Page 73)

Syntax: show topology-group [ group-id ]
This display shows the following information.
CLI display of topology group information TABLE 18
Field Description
master-vlan The master VLAN for the topology group. The settings for STP, MRP, or VSRP on the
control ports in the master VLAN apply to all control ports in the member VLANs within the
topology group.
member-vlan The member VLANs in the topology group.
Common control ports The master VLAN ports that are configured with Layer 2 protocol information. The Layer 2
protocol configuration and state of these ports in the master VLAN applies to the same port
numbers in all the member VLANs.
L2 protocol The Layer 2 protocol configured on the control ports. The Layer 2 protocol can be one of
the following:
• MRP
• STP
• VSRP
Per vlan free ports The ports that are not controlled by the Layer 2 protocol information in the master VLAN.
Metro Ring Protocol
Metro Ring Protocol (MRP) is a Brocade proprietary protocol that prevents Layer 2 loops and provides
fast reconvergence in Layer 2 ring topologies. It is an alternative to STP and is especially useful in
Metropolitan Area Networks (MANs) where using STP has the following drawbacks:
• STP allows a maximum of seven nodes. Metro rings can easily contain more nodes than this.
• STP has a slow reconvergence time, taking many seconds or even minutes. MRP can detect and
heal a break in the ring in sub-second time.
NOTE
MRP portocol is not supported on the Brocade ICX-6430-C devices.
The following figure shows an example of an MRP metro ring.
Metro Ring Protocol
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