3com 5500-ei pwr Installation Instruction

 

1-5 

Then the system automatically synchronizes the configurations to the device with the smallest unit 

ID and changes the fabric name. 

With the above operations completed, the device can be added to the fabric and work normally. 

 

z 

You need to enable the XRN automatic fabric function on all the devices including the candidate 

switch in the fabric to enable the candidate switch to download software and discovery neighbors 

and thus be added to the fabric normally. 

z 

If the candidate switch is going to download software from a unit in an XRN fabric, you are 

recommended to set the ID of the unit to 1 to make the candidate switch download the software of 

correct version. 

 

When a fabric is established, the devices determine their respective roles in the fabric by comparing 

their CPU MAC addresses. The device with the lowest CPU MAC address is elected as the master and 

the other devices are slaves. 

After the election, the fabric can operate normally. The following three functions of XRN can provide 

simple configuration mode, enhanced network performance and perfect redundancy backup 

mechanism for users. 

 

DDM is a new device management mode provided by XRN. In normal cases, a fabric can be considered 

as a single device. You can manage the entire fabric by logging onto any device in the fabric with 

different logging modes. The devices in the fabric synchronize their configurations by exchanging 

packets, thus ensuring stability of the fabric. 

FTM program uses Unit ID, or device ID to distinguish between the devices in a fabric when you 

manage them. On initialization of the XRN function, each device considers its Unit ID as 1 and after a 

fabric connection is established, the FTM program automatically re-numbers the devices or you can 

manually configure the Unit ID of them. 

The master in a fabric collects the newest configurations of the user and the slaves periodically 

synchronize the configurations from the master. In this way, the entire fabric can operate with the same 

configurations. 

DRR is used to implement redundancy routing backup. The devices in a fabric run their independent 

routing protocols and maintain their own routing tables. Unlike a common layer 3 switch, a fabric 

member does not generate a layer 3 forwarding table to forward packets; instead, it uploads the routing 

table to the master, which generates a forwarding table used by the entire fabric by integrating the 

routing tables of all the devices. Then each slave synchronizes this forwarding table from the master 

and takes it as the basis for layer 3 forwarding.