Why Can HDLC But Not PPP Go Up on a POS Interface When Remote Loopback Is Performed on This Interface?

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When remote loopback is performed on a POS interface, the magic number mechanism of PPP will detect a loop, causing LCP negotiation to fail. As a result, the link layer protocol PPP cannot go Up.

When HDLC receives a self-originated protocol packet that is looped back, HDLC considers the packet as a protocol packet from the peer, in which case HDLC goes Up.

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