10-18-2007 12:15 AM - edited 03-05-2019 07:10 PM
Hi all, can anyone tell me what triggers the spanning tree change notifications, would enabling a port cause the switch to send one out? and what effect does it have on the network ?
10-18-2007 12:52 AM
TCNs are generated whenever there is a topology change, including enabling a port. This is one reason why it is advisable to put spanning-tree portfast on the access ports. That way, they do not generate TCNs every time a host comes on- or off- line.
Kevin Dorrell
Luxembourg
10-25-2007 08:27 AM
can anyone tell me what these tcn's do to the network ?
10-25-2007 09:03 AM
STP topology change mechanism:
http://www.cisco.com/warp/public/473/17.html
RSTP/MST topology change mechanism:
http://www.cisco.com/warp/public/473/146.html#newtop
Regards,
Francois
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