HP 6125XLG R2306-HP 6125XLG Blade Switch High Availability Configuration Guide - Page 33
Broken fiber
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a. Port 1 receives the RecoverProbe packet from Port 4, and returns a RecoverEcho packet. b. Port 4 cannot receive any RecoverEcho packet from Port 1, so Port 4 cannot become the neighbor of Port 1. c. Port 3 can receive the RecoverEcho packet from Port 1, but Port 3 is not the intended destination, so Port 3 cannot become the neighbor of Port 1. The same process occurs on the other three ports. The four ports are all in Unidirectional state. • Unidirectional links occur after you enable DLDP. Figure 8 Broken fiber Correct fiber connection Device A Port 1 Port 2 Device B One fiber is broken Device A Port 1 Port 2 Device B Ethernet fiber port Tx end Rx end Fiber link Broken fiber As shown in Figure 8, Device and Device B are connected through an optical fiber. After you enable DLDP, Port 1 and Port 2 establish the bidirectional neighborship in the following way: a. Port 1 that is physically up enters the Unidirectional state and sends a RecoverProbe packet. b. After receiving the RecoverProbe packet, Port 2 returns a RecoverEcho packet. c. After Port 1 receives the RecoverEcho packet and detects that the neighbor information in the packet matches the local information, Port 1 establishes the neighborship with Port 2 and transits to the Bidirectional state. Port 1 then starts the Entry timer and periodically sends Advertisement packets. d. After Port 2 receives the Advertisement packet, it establishes the Unconfirmed neighborship with Port 1. Port 2 then starts the Echo timer and Probe timer, and periodically sends Probe packets. e. After receiving the Probe packet, Port 1 returns an Echo packet. f. After Port 2 receives the Echo packet and detects that the neighbor information in the packet matches the local information, the neighbor state of Port 1 becomes Confirmed. Port 2 then transits to the Bidirectional state, starts the Entry timer, and periodically sends Advertisement packets. The bidirectional neighborship between Port 1 and Port 2 is now established. After that, when Port 2's Rx end fails to receive signals, Port 2 is physically down and enters the Inactive state. Because Port 2's Tx end can still send signals to Port 1, Port 1 stays up. After the Entry timer for Port 2 expires, Port 1 starts the Enhanced timer and Echo timer, and sends a probe packet to Port 2. Because Port 1's Tx line is broken, Port 1 cannot receive the Echo packet from Port 2 after the Echo timer expires. Port 1 then enters the Unidirectional state, and sends a Disable 28