Extreme Networks ExtremeWare XOS 10.1, Manual

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98 ExtremeWare XOS 10.1 Concepts Guide
Status Monitoring and Statistics
•
Slot ID—The number of the slot where the node is installed.
• MAC address—The MAC address is used to determine the primary node if all other parameters are
equal.
Configuring Node Parameters
To configure the parameters of a node, use the following command:
configure node slot <slot_id> priority <node_pri>
Configuring the Node State
You can bring a node offline to run diagnostics or perform software upgrades. If you specify the
primary node to be offline, the system will failover to the backup node and the previous primary node
will become the new backup node. If you specify the backup node to be offline, the processes on the
primary will stop checkpointing because the backup node is unavailable.
NOTE
If you configure the node to be offline, it is not available to participate in leader election.
To bring a node offline, use the following command:
configure node slot <slot_id> offline priority <node_pri>
To bring a node back online, use the following command:
configure node slot <slot_id> online priority <node_pri>
Relinquishing Primary Status
You can force the primary node to failover to the backup thereby relinquishing its primary status. You
execute this command on the primary node.
To failover to the backup node, use the following command:
failover {force}
If you specify
force
, the primary node will failover provided the backup node can take over as
primary. If there is no backup node, the primary will transition to the standby state and a new election
will start based on the current health of the node and a new primary will take over.
If you do not specify
force
, failover will not occur unless the backup node (MSM) is in sync with the
primary.
Replicating Data Between the Nodes
ExtremeWare XOS replicates configuration information between the primary MSM to the backup MSM
so the system can recover if the primary MSM fails. This method of replicating data is known as
checkpointing. Checkpointing is the process of copying the active state configurations from the primary
MSM to the backup MSM.
Replicating data consists of the following three steps: