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https://www.arista.com/en/products

https://www.arista.com/en/products/7280e-series

Arista 7280E:   Ultra deep 9GB of packet buffers 

Total System Buffer

10Gbps:  9x8Gb/10Gb = 7.2 sec

40Bgps:  9x8Gb/40Gb = 1.8 sec

100Bgps:  9x8Gb/10Gb = 0.72 sec  or 720msec

QFX10k:  up to 100ms per ports ( any ports)

10Gbps:  10Gbps x 0.1sec  = 1Gb / 8 = 0.125 GB  per ports

40Bgps:  40Gbps x 0.1sec  = 4Gb / 8 = 0.25 GB per ports

100Bgps:  100Gbps x 0.1sec  = 10Gb / 8 = 1.25 GB per ports

White paper: Packet Buffers In Cloud Network Switches

https://www.arista.com/assets/data/pdf/Whitepapers/BigDataBigBuffers-WP.pdf

Comparing the Broadcom Silicons used in Datacenter switches

https://www.linkedin.com/pulse/comparing-broadcom-silicons-used-datacenter-switches-reza-toghraee/

1- Strata XGS Family

Trident 2 (10g / 40G)
Trident 2+ (10G / 40G , Enhanced Trident 2 , with VXLAN Routing)
Tomahawk (100G)

2- Strata DNX Family

Qumran (10G/40G)
Jericho (packet processor)
FE 3600 (Fabric)

10 Tb/s StrataDNX™ Jericho2 Ethernet Switch Series

https://www.broadcom.com/products/ethernet-connectivity/switching/stratadnx/bcm88690