Delay buffer enhancement

Enables you to configure a percentage of delay buffer that exceeds the transmit-rate percentage. This type of configuration maximizes bandwidth utilization and is useful for bursty, latency-immune traffic classes. vSRX interfaces of 1 Gbps have a class of service (CoS) default delay buffer time of 1 second, a maximum buffer time of 32 seconds, and a maximum buffer size of 128 MB. On a logical vSRX interface, the sum of the guaranteed delay buffer sizes acts as a pool that can be shared among the queues that do not have a specific shaping rate.