Guidelines For Configuring Netref - Juniper CTP Series Manual

Guidelines for Configuring NetRef

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Copyright © 2018, Juniper Networks, Inc.
configured as a NetRef backup node with the IP address of the NetRef primary node
configured.
Adaptive bundle operation— Normally, the adaptive clocking algorithm is used to
control the port clock, but when NetRef is configured for adaptive bundle operation,
the adaptive clocking algorithm instead controls the node clock. The clocking for the
whole node is then derived from the clock that drives the remote port. If the remote
port is configured for TT, then the local node is clocked to the remote port's external
clock. If the remote port is configured for configured rate, then the local node clock is
derived from the remote node clock.
When a node is configured for NetRef backup or adaptive bundle operation, all the external
references must be disabled. If timing packets stop arriving at a NetRef backup node ,
the backup node waits until packets start arriving again to make any clock adjustments.
When the packets start arriving again, NetRef transitions to Wait state, waits for 16
packets, and then transitions to the Aggressive state. The LED becomes red when NetRef
is in Wait or Aggressive state. The LED is green when NetRef is in Maintain state.
You can configure the NetRef adaptive parameters from the port menu. However, you
cannot modify the adaptive parameters of a NetRef backup node.
If a CTP bundle is already configured between the two nodes, using NetRef adaptive
bundle operation does not add to the network traffic between the nodes.
Though NetRef is supported only on CTPOS 5.4R1 and later, it supports remote nodes
running earlier CTPOS versions. No special configuration needs to be made on the
remote node.
The maximum number of backup nodes that a NetRef primary node can have is limited
to 10. However, there is no limit on the number of backup nodes for the NetRef adaptive
bundle operation.
Adaptive bundle operation depends on the bundle state and requires a CTP bundle
between the nodes. The node synchronization process stops if the bundle comes down.
NetRef primary or master operation does not need a CTP bundle between the nodes.
Configuring NetRef for Adaptive Bundle Operation on page 120
Configuring NetRef for Primary or Backup Operation on page 121
Chapter 2: Configuring CTP Bundles
119