Brocade Multi-Service IronWare Switching Configuration Gui Manual de usuario descargar pdf (Pagina 520)

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490 Multi-Service IronWare Switching Configuration Guide

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MRP Phase 2

FIGURE 115 Example 1 multiple rings sharing interfaces - phase 2

On each node that will participate in ring 1, you configure the ring ID and the ring interfaces that

will be used. You repeat the configuration steps for all nodes in ring 2. In a multiple ring

configuration, a ring’s ID determines its priority. The lower the ring ID, the higher the priority of a

ring with ring ID 1 being the highest possible priority.

A key concept with MRP phase 2 is the ability to extend a single vlan across the whole topology

even when multiple rings are required. Consider the example in Figure 116 where we have 3 MRP

rings and a customer who needs to create neighbor relationships between all three routers

depicted. The routers all have interfaces configured in a single subnet and need IP connectivity

between each other.

If each ring had an independent vlan then we would have to have a mechanism to move IP packets

from a single IP subnet between different layer 2 topologies. By using MRP phase 2 we have

multiple rings all associated with a single layer 2 topology allowing a common subnet to be

distributed in the manner shown in the example. Whilst this looks nothing like a standard spanning

tree network it should be treated in the same way from the perspective of a layer 2 topology,

multiple paths where certain paths must be blocked to prevent loops at layer 2.

In addition it should be noted that the concept of multiple rings being associated with a single vlan

describes the extent to which broadcasts will be propagated at layer 2 for that vlan. In other words

a broadcast will be propagated to all ring interfaces in the layer 2 topology. The use of topology

groups allows multiple vlans to effectively reuse a single layer 2 topology while maintaining a level

of separation.

The obvious issue with this approach is that there must be a mechanism to prevent loops on the

rings and this is the job of MRP, layer 2 loop prevention.

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