Proxmox VE 802.3ad bonding issues on Dell PE Servers Connecting to Dell PC Switches

Scenario: We found an issue with bonding (trunking/bundling/teaming/channeling) copper ethernet links between Dell PowerEdge T420 Servers running Proxmox 6 and Dell PowerConnect 55xx series switches.

ENV: Proxmox 6.1-7 on Dell PowerEdge T420 Servers
BIOS v2.6, Xeon E5 2420 CPU, Integrated BCM5720 (FW:20.8.4) Ethernet Ports 2x in proxmox bond0.
PowerConnect 5548 Series switch with firmware 4.1.0.20

It looked to be an issue of timing where interfaces on the server would come up listening for LACP control packets and time out before the switch was ready to bring up the bond.

Fix:
Added slight interface monitor delays and interface up delays to the bond interface in proxmox. Bellow is a snippet.

#! /etc/network/interfaces
#--------
auto bond0
iface bond0 inet manual 
        bond-slaves eno1 eno2 
        bond-mode 802.3ad 
        bond-miimon 100 
        bond-updelay 200
#--------

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