UMN:CLI
User Manual
V8102
370
Fig. 9.26
Convergence of 802.1d Network
This is a very epochal way of preventing a loop. The matter is that communication is
SWITCH D and SWITCH C is blocked. Then, right after the connection, it is possible to
transmit BPDU although packets can not be transmitted and received between SWITCH
A and the root.
Fig. 9.27
Network Convergence of 802.1w (1)
SWITCH A negotiates with the root through BPDU. To make link between SWITCH A and
the root, the state of non-edge designated port of SWITCH C is changed to blocking. Alt-
hough SWITCH A is connected to the root, loop will not be generated because SWITCH A
is blocked to SWITCH B and SWITCH C. In this state, BPDU from the root is transmitted
to SWITCH B and SWITCH C through SWITCH A. To configure the forwarding state of
SWITCH A, SWITCH A negotiates with SWITCH B and SWITCH C.
