use strict;
use warnings;
use Data::Dumper;

my $state = {
    started              => 0,
    current_port_channel => undef,
    inside_ports_item    => 0
};
my $data = { port_channel => {} };

while (<DATA>) {

    chomp;

    $state->{started}++ and next if /--- show port-channel database ---/;
  next unless $state->{started};

    if (/^port-channel (\d+)/) {
        $data->{port_channel}->{$1} = {};
        $state->{current_port_channel} = $1;
      next;
    }


    if ( $state->{current_port_channel} ) {

        if (/^\s+Ports:\s+(\S+)\s+\[(.+?)]/) {

            push @{ $data->{port_channel}->{ $state->{current_port_channel} }->{port_member} }, $1;

            # play with $2 ("up", "down", if you want to)
            $state->{inside_ports_item} = 1;
          next;
        }

        if ( $state->{inside_ports_item} and /^\s+(\S+)\s+\[(.+?)]/ ) {
            push @{ $data->{port_channel}->{ $state->{current_port_channel} }->{port_member} }, $1;

          next;
        }

    }

} ### while (<DATA>)

print Dumper $data;

__DATA__
-------------------- show port-channel database ------------------
port-channel 1
    Administrative channel mode is on
    Operational channel mode is on
    Last membership update succeeded
    First operational port is fc1/5
    2 ports in total, 2 ports up
    Ports:   fc2/5    [up]
             fc1/5    [up] *

port-channel 3
    Administrative channel mode is on
    Operational channel mode is on
    Last membership update succeeded
    First operational port is fc1/1
    1 port in total, 1 port up
    Ports:   fc1/1    [up] *

******************************************************************


##</code><code>##

$VAR1 = {
    'port_channel' => {
        '1' => { 'port_member' => [ 'fc2/5', 'fc1/5' ] },
        '3' => { 'port_member' => [ 'fc1/1' ] }
    }
};