Using Mrp Diagnostics - HP ProCurve 9304M Installation And Configuration Manual

Installation and Basic Configuration Guide
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:
HP9300(config-vlan-2-mrp-1)# hello-time 200
HP9300(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. 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.
NOTE: You can use MRP ring diagnostics to determine whether you need to change the hello time and
preforwarding time. See "Using MRP Diagnostics".

Using MRP Diagnostics

The MRP diagnostics feature calculates how long it takes for RHP packets to travel through the ring. When you
enable MRP diagnostics, the software tracks RHP packets according to their sequence numbers and calculates
how long it takes an RHP packet to travel one time through the entire ring. When you display the diagnostics, the
CLI shows the average round-trip time for the RHP packets sent since you enabled diagnostics. The calculated
results have a granularity of 1 microsecond.
Enabling MRP Diagnostics
To enable MRP diagnostics for a ring, enter the following command on the Master node, at the configuration level
for the ring:
HP9300(config-vlan-2-mrp-1)# diagnostics
Syntax: [no] diagnostics
NOTE: This command is valid only on the master node.
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