Dell FCX624-S Laptop User Manual


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PowerConnect B-Series FCX Configuration Guide 351
53-1002266-01
Metro Ring Protocol (MRP)
10
Configures this node as the master node for the ring. Enter this command only on one node in the
ring. The node is a member (non-master) node by default.
Syntax: [no] ring-interface ethernet <primary-if> ethernet <secondary-if>
The ethernet <primary-if> parameter specifies the primary interface. On the master node, the
primary interface is the one that originates RHPs. Ring control traffic and Layer 2 data traffic will
flow in the outward direction from this interface by default. On member nodes, the direction of
traffic flow depends on the traffic direction selected by the master node. Therefore, on a member
node, the order in which you enter the interfaces does not matter.
The ethernet <secondary-if> parameter specifies the secondary interface.
NOTE
To take advantage of every interface in a Metro network, you can configure another MRP ring and
either configure a different Master node for the ring or reverse the configuration of the primary and
secondary interfaces on the Master node. Configuring multiple rings enables you to use all the ports
in the ring. The same port can forward traffic one ring while blocking traffic for another ring.
Syntax: [no] enable
The enable command enables the ring.
Changing the hello and preforwarding times
You also can change the RHP hello time and preforwarding time. To do so, enter commands such
as the following.
PowerConnect(config-vlan-2-mrp-1)#hello-time 200
PowerConnect(config-vlan-2-mrp-1)#preforwarding-time 400
These commands change the hello time to 200 ms and change the preforwarding time to 400 ms.
Syntax: [no] hello-time <ms>
Syntax: [no] preforwarding-time <ms>
The <ms> specifies the number of milliseconds. For the hello time, you can specify from 100 –
1000 (one second). The default hello time is 100 ms. The preforwarding time can be from 200 –
5000 ms, but must be at least twice the value of the hello time and must be a multiple of the hello
time. The default preforwarding time is 300 ms. A change to the hello time or preforwarding time
takes effect as soon as you enter the command.
Configuration notes
The preforwarding time must be at least twice the value of the hello time and must be a
multiple of the hello time.
If UDLD is also enabled on the device, Dell recommends that you set the MRP preforwarding
time slightly higher than the default of 300 ms; for example, to 400 or 500 ms.
You can use MRP ring diagnostics to determine whether you need to change the hello time and
preforwarding time. Refer to “Using MRP diagnostics”.