H3C Technologies H3C SR8800 - Manual (Page 159)

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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.