If you have expensive or low capacity links
that you want to use only as a last resort or as a backup link,
select the Top Down Priority method and place the tags that include
those links last in the list of Link Tags for this profile. The firewall
uses the top Link Tag in the list first to determine the links on
which to session load traffic and on which to fail over. If none
of the links in the top Link Tag are qualified, the firewall selects
a link from the second Link Tag in the list. If none of the links
in the second Link Tag are qualified, the process continues as necessary
until the firewall finds a qualified link in the last Link Tag.
If all associated links are overloaded and no link meets quality
thresholds, the firewall uses the Best Available Path method to
select a link on which to forward traffic. If the application’s
jitter, latency, or packet loss exceeds its configured threshold,
the firewall starts at the top of the Top Down list of Link Tags
to find a link to which it fails over. |