3com 5500-SI Manual Do Utilizador

C

HAPTER

 4: XRN C

ONFIGURATION

If you configure the same entry in the same ROM group for devices of a fabric to be 
different values, the entry values of all the conflicting devices will adopt that of the 
conflicting device with the smallest Unit ID when you synchronize the devices. Such a 
mechanism eliminates configuration conflicts between the devices in a fabric.

After the device configurations converge, you can collect RMON history and statistics 
data of any units from any switch in the fabric.

After the configurations of the switches in a fabric converge, you can use the 
following commands to collect RMON data of the devices in the fabric.

Through neighbor topology discovery protocol (NTDP), Clustering can collect the 
information about the connection relations of the devices in a network and candidate 
devices, consequently maintaining and managing the cluster topology.

With Clustering employed, the NTDP topology information collecting function is 
enabled by default on the management device of the cluster. And the timer is set to 1 
minute. A management device can also perceive in time any changes of the cluster 
topology caused by new devices being added to the cluster and determine the 
candidate switches among the detected devices. By sending joining-request packets 
to candidate switches, the management device also enables these devices to be 
plug-and-play.

As the basis of the XRN function, the fabric topology management (FTM) module 
manages and maintains the entire topology of a fabric. The FTM module also 
implements the peer fabric port detection function.

A device can join a fabric only when the following conditions are met.

n

The number of the existing devices in the fabric does not reach the maximum 
number of devices allowed by the fabric.

n

The fabric names of the device and the existing devices in the Fabric are the same.

n

The software version of the device is the same as that of the existing devices in the 
fabric.

n

The device passes the security authentication if security authentication is enabled 
in the fabric.

After a switch is powered on, the FTM module releases device information of the 
switch through the fabric ports. The device information includes UNIT ID, CPU MAC, 
device type ID, fabric port information, and all fabric configuration information. The 
device information is released in the form of discovery packet (DISC). A new device 
can join a fabric only when its DISC packets pass the authentication performed by the 
existing devices in the fabric.

n

If a fabric port of a switch is connected to a non-fabric port, the switch will not 
receive DISC packets from the peer. In this case, the switch cannot join the fabric.

Collect the RMON statistics data of 
a specified unit

display rmon statistics unit 
unit-id

You can execute the display 
command in any view.

Collect the RMON history data of a 
specified units

display rmon history unit 
unit-id