UMN:CLI User Manual
V5808
294
Fig. 8.17 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. 8.18 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.
Although 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.
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