How can I add two Ethernet devices to for each simulation in an ARM distributed simulation?

[sammy17]

I want to have two Ethernet devices in each system in an ARM-distributed system.
I was able to run a distributed system simulation with a single Ethernet device per system without any issues.
I tried to add two ethernet devices to the simulation as below:

I edited the dist_bigLITTLE.py file to instantiate a second DistEtherLink as below:

gem5/configs/example/arm/dist_bigLITTLE.py

Line 138 in c890e6b

def addEthernet(system, options):

def addEthernet(system, options):
    # create NIC
    dev = IGbE_e1000()
    system.attach_pci(dev)
    system.ethernet = dev

    # create a second NIC
    dev2 = IGbE_e1000()
    system.attach_pci(dev2)
    system.ethernet2 = dev2

    # create distributed ethernet link
    system.etherlink = DistEtherLink(
        speed=options.ethernet_linkspeed,
        delay=options.ethernet_linkdelay,
        dist_rank=options.dist_rank,
        dist_size=options.dist_size,
        server_name=options.dist_server_name,
        server_port=options.dist_server_port,
        sync_start=options.dist_sync_start,
        sync_repeat=options.dist_sync_repeat,
    )
    system.etherlink.int0 = Parent.system.ethernet.interface
    if options.etherdump:
        system.etherdump = EtherDump(file=options.etherdump)
        system.etherlink.dump = system.etherdump

    # create a second distributed ethernet link
    system.etherlink2 = DistEtherLink(
        speed=options.ethernet_linkspeed,
        delay=options.ethernet_linkdelay,
        dist_rank=options.dist_rank,
        dist_size=options.dist_size,
        server_name=options.dist_server_name,
        server_port=options.dist_server_port,
        sync_start=options.dist_sync_start,
        sync_repeat=options.dist_sync_repeat,
    )
    system.etherlink2.int0 = Parent.system.ethernet2.interface
    if options.etherdump:
        system.etherdump2 = EtherDump(file=options.etherdump)
        system.etherlink2.dump = system.etherdump

As shown, I first defined an ethernet2 device in the system and then instantiated a second etherlink2.
After I made these changes, the second system simulation did not run. It hung without initiating the bootup.

I guessed that this is related to the switch as well, maybe the switch needs to be configured to accept 4 connections, 2 per system.

What is the correct way to add 2 Ethernet devices per system? Is there a parameter in the switch that I can change to accommodate this (I could not find such an option so far)?