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Recommendations

ACX7100 and ACX7509 platforms support deterministic and effective QoS, performing within expectations for the 5G CSR and HSR in the Fronthaul segment.

Layer 3 (DSCP), MPLS (EXP), and Layer 2 (802.1p) single-tagged or dual-tagged traffic were correctly classified based on appropriate codepoints. Priority hierarchies were honored within expected guaranteed and excess regions, defined by transmit rate. Shaping the strict-high queue prevents starving low priority queues, which were guaranteed the configured committed information rates (CIR) using transmit-rate percentages. When a port is shaped, the configured CoS scheduling parameters are correctly adjusted. Codepoint preservation was achieved across all featured VLAN manipulation sequences (where expected). The platforms met latency performance requirements in non-congested scenarios, with 64b frame size achieving the best results. All stated goals were passed, with a few deviations explained below.

During the validation, several functional differences were observed with ACX7000 series compared to ACX5448/ACX710 platforms. Contact your Juniper Networks representative for the complete test report.

  • ACX7100/ACX7509 supports significantly more VLAN manipulation operations compared to earlier ACX platforms, to bring relative parity with MX platforms.
  • 802.1p bits are preserved without incurring a default rewrite, where ACX5448/ACX710 performs default rewrite.
  • EXP bits are preserved only when default exp classification is used.
  • Multiple rewrite rules are allowed with support for both multiple classification and rewrite.
  • The ACX7000 series does not include simultaneous use of transmit-rate and shaping-rate for a queue. When only shaping-rate is utilized, the behavior is such that the strict-high queue deducts the configured rate from the total port speed, and the remaining bandwidth is allocated to the other queues based on their configured percentages. For example, if a 10G port has a 40% shaping-rate queue (SH), it deducts 4G from the total port speed. The remaining 6G is allocated to the other queues. For instance, a low priority queue with a 50% transmit-rate receives 3G.