Why does a BGP peer send an open message twice on S series switches

The two peers that set up a BGP session are not of the master and slave relationship. Both the two peers attempt to set up a connection. A peer initiatively sends an Open message to set up a BGP connection, and replies with an Open message after receiving the Open message from its peer. During the negotiation, a connection is closed. As a result, a BGP peer may send an Open message twice.

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