Can any one suggest what is the best practise to configure Trunk link on 6509 Cat OS. is it goo to keep trunk link on "Desirable" or should we keep it on "ON" state. Considering stability and security.
Cisco recommends an explicit trunk configuration of desirable at both ends. In this mode, network operators can trust syslog and command line status messages that a port is up and trunking, unlike on mode, which can make a port appear up even though the neighbor is misconfigured. In addition, desirable mode trunk provides stability in situations where one side of the link cannot become a trunk or drops trunk state. Issue this command in order to set desirable mode:
set trunk mod/port desirable ISL | dot1q
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