Dell Brocade DCX, Configuration Manual, Page: 469 / 1436

BigIron RX Series Configuration Guide 397
53-1001810-01
MRP phase 2
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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.
BigIron RX(config-vlan-2-mrp-1)# hello-time 200
BigIron RX(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.
NOTE
The preforwarding time must be at least twice the value of the hello time and must be a multiple of
the hello time.
Syntax: [no] hello-time <ms>
Syntax: [no] preforwarding-time <ms>
The < ms> specifies the number of milliseconds.
The hello time can be 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.
NOTE
You can use MRP ring diagnostics to determine whether you need to change the hello time and
preforwarding time. Refer to
“MRP phase 2” .
MRP phase 2
Beginning with the BIgIron RX release 02.4.00, Metro Ring Protocol (MRP) Phase 2 expands the
functionality of MRP by allowing a physical interface that belong to the same VLAN to be shared by
multiple rings.
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) that require more nodes and faster reconvergence time than what STP provides.
An MRP ring consists of nodes and each node has two interfaces on the ring. The interfaces on the
ring must be members of the same port-based VLAN. Each node on the ring is connected to a
separate customer network. The nodes forward Layer 2 traffic to and from the customer networks
through the ring.