i use the topology for test stp tcn_bpdu:
sw_1 (root bridge)
|
|<port1:root port>
sw_2
|<port2:designated port>
|
--------pc
sw_2's port1 is root port.
sw_2's port2 is designated port.
0.after the stp tree stable(sw_1 is root bridge),i beging sniffer the port1's ingress&egress package.
1.1min later,i unplug port2.
2.after another 1min,i plug port2.
3.after 3min,i stop sniffer.
from the sniffer file,i fond port1 does't send tcn_bpdu
when i unpluge port2,but it send tcn_bpdu when i pluge
port2.
who can tell me why sw_2 does't send tcn_bpdu when it fond
the port2 down?does it no a topology change?
thans a lots!
