HP 3600 v2 series Configuration Manual page 150

Figure 57 L1/L2 LSP format
Major fields of the L1/L2 LSP are as follows:
PDU length: Total length of the PDU in bytes
•
Remaining lifetime: LSP remaining lifetime in seconds
•
LSP ID: Consists of the system ID, the pseudonode ID (one byte) and the LSP fragment number (one
•
byte)
• Sequence number: LSP sequence number
Checksum: LSP checksum
•
P (Partition Repair): Only for L2 LSPs; it indicates whether the router supports partition repair.
•
ATT (Attachment): Generated by a L1/L1 router for L1 LSPs only; it indicates that the router
•
generating the LSP is connected to multiple areas.
OL (LSDB Overload): Indicates that the LSDB is not complete because the router has run out of
•
memory. Other routers will not send packets to the overloaded router, except packets destined to the
networks directly connected to the router. For example, in
Router C through Router B. Once other routers know the OL field of LSPs from Router B is set to 1,
Router A will send packets to Router C via Router D and Router E, but still send to Router B packets
destined to the network directly connected to Router B.
Figure
138
58, Router A forwards packets to