| 摘要 |
In some ring protocols, control messages are exchanged among ring nodes in order to implement certain behaviors, such as loop-free behavior and/or failure recovery, within the ring. A segment of a ring can be replaced by another network, effectively turning the ring into a daisy chain. If the intervening network does not allow transmission of the control messages used by the ring protocol, certain control messages may be blocked, causing the ring to operate in undesirable ways. Reflector ports can be implemented at each end of the daisy chain in order to prevent these control messages from being blocked.
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