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H3C Technologies H3C SR8800 User Manual

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Figure 55 L1/L2 LAN IIH format

Reserved/Circuit Type—The first 6 bits are reserved with a value of 0. The last 2 bits indicate the
router type. 00 means reserved, 01 indicates L1, 10 indicates L2, and 11 indicates L1/2.

Source ID—System ID of the router advertising the hello packet.

Holding Time—If no hello packets are received from the neighbor within the holding time, the

neighbor is considered down.

PDU Length—Total length of the PDU in bytes.

Priority—DIS priority.

LAN ID—Includes the system ID and a one-byte pseudonode ID.

Figure 56

shows the hello packet format on the point-to-point networks.