Last Modified: May 29, 2024
Affected Product(s):
F5OS (all modules)
Fixed In:
F5OS-A 1.3.0, F5OS-A 1.2.0
Opened: Mar 28, 2022 Severity: 2-Critical
Unexpected egress packet drops can be seen in XBAR for 10G, 25G, and 40G ports. This is a packet burst congestion issue that overflows XBAR egress buffers. The issue is seen mainly on 10G ports.
The impact is egress packets dropped at 10G, 25G, and 40G front panel interfaces.
This issue can happen when customers are using the 10G, 25G, or 40G front panel interfaces.
The workaround for this issue is to upgrade to NSO bitfile version nso_1ST210EU2F50E2VG_v70.2.10.11_d22.06.23.00.bit and ASW bitfile version asw_1ST280EU2F50E2VG_v71.2.12.11_d22.06.15.00.bit. These bitfiles and newer include added packet buffer memory in the XBAR. The added packet buffer memory greatly improves the packet drop issue, but does not resolve it completely. In testing, packet drops were still seen as system throughput approached 190Gb.
The initial fix for this issue is to add memory to the 10G, 25G, and 40G output buffers. Memory was increased from 4Mb to 8Mb. The added packet buffer memory greatly improves the packet drop issue, but does not resolve it completely. In testing, packet drops were still seen as system throughput approached 190Gb.