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As an example, recently I was asked to build such a lab for the Service Control Gateway (SCG) and Contrail...Therefore, it's necessary to first put the gateway into "maintenance mode" and then ensure that all subscribers are cleared
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Answer If you do nothing to configure or assign classifiers on Juniper routing devices, Junos OS automatically assigns an implicit default IP precedence classifier to all logical interfaces that maps IPv4 precedence code points to best-effort and network-control forwarding classes. By default, the best effort forwarding class (queue 0) receives 95 percent of the total port bandwidth and buffer space for the output link, and the network control forwarding class (queue 3) receives 5 percent
For the best effort forwarding class, loss priority is typically not carried in a class-of-service (CoS) value and random early detection (RED) drop profiles are more aggressive. Network control (NC)—This class is typically high priority because it is used for the network controlling protocols (routing and network device management)
Schedulers determine the amount of interface bandwidth assigned to each queue on an interface, the size of the memory buffer allocated for storing packets in each queue, the scheduling priority of each queue, and the random early detection (RED) drop profiles associated with each queue to control packet drop during periods of congestion
Juniper routing devices provide four default forwarding classes: best effort, expedited forwarding, assured forwarding, and network control. On most Juniper routing devices, you can configure up to 16 custom forwarding classes mapped to up to 8 queues
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