Dell Brocade DCX, Configuration Manual

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BigIron RX Series Configuration Guide 395
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Configuring MRP
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You can configure MRP separately on each customer VLAN. However, this is impractical if you have
many customers. To simplify configuration when you have a lot of customers (and therefore a lot of
VLANs), you can use a topology group.
A topology group enables you to control forwarding in multiple VLANs using a single instance of a
Layer 2 protocol such as MRP. A topology group contains a master VLAN and member VLANs. The
master VLAN contains all the configuration parameters for the Layer 2 protocol (STP, MRP, or
VSRP). The member VLANs use the Layer 2 configuration of the master VLAN.
In Figure 68 , VLAN 2 is the master VLAN and contains the MRP configuration parameters for ring 1.
VLAN 30 and VLAN 40, the customer VLANs, are member VLANs in the topology group. Since a
topology group is used, a single instance of MRP provides redundancy and loop prevention for both
the customer VLANs.
If you use a topology group:
•
The master VLAN must contain the ring interfaces. The ports must be tagged, since they will
be shared by multiple VLANs.
•
The member VLAN for a customer must contain the two ring interfaces and the interfaces for
the customer. Since these interfaces are shared with the master VLAN, they must be tagged.
Do not add another customer’s interfaces to the VLAN.
For more information about topology groups, refer to Chapter 16, “Topology Groups” .
Refer to “MRP CLI example” on page 407 for the configuration commands required to implement
the MRP configuration shown in Figure 68 .
Configuring MRP
To configure MRP, perform the following tasks. You need to perform the first task on only one of the
nodes. Perform the remaining tasks on all the nodes:
•
Disable one of the ring interfaces. This prevents a Layer 2 loop from occurring while you are
configuring the devices for MRP.
•
Add an MRP ring to a port-based VLAN. When you add a ring, the CLI changes to the
configuration level for the ring, where you can do the following:
•
Optionally, specify a name for the ring.
•
On the master node only, enable the device to be the master for the ring. Each ring can
have only one master node.
•
Specify the MRP interfaces. Each device has two interfaces to an MRP ring.
•
Optionally, change the hello time and the preforwarding time. These parameters control
how quickly failover occurs following a change in the state of a link in the ring.
•
Enable the ring.
•
Optionally, add the ring’s VLAN to a topology group to add more VLANs to the ring. If you use a
topology group, make sure you configure MRP on the group’s master VLAN. Refer to
Chapter
16, “Topology Groups” .
•
Re-enable the interface you disabled to prevent a Layer 2 loop. Once MRP is enabled, MRP will
prevent the Layer 2 loop.