Lsr packet – H3C Technologies H3C SR8800 User Manual
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Figure 27 DD packet format
Major fields:
•
Interface MTU—Specifies the largest IP datagram in bytes that the interface can send without
fragmentation.
•
I (Initial)—The Init bit, which is set to 1 if the packet is the first DD packet. It is set to 0 if not.
•
M (More)—The More bit, which is set to 0 if the packet is the last DD packet. It is set to 1 if more DD
packets are to follow.
•
MS (Master/Slave)—The Master/Slave bit. When set to 1, it indicates that the router is the master
during the database exchange process; otherwise, the router is the slave router.
•
DD Sequence Number—Used to sequence the collection of DD packets. The initial value is set by
the master. The DD sequence number then increments until the complete database description has
been sent.
LSR packet
After exchanging DD packets, two routers know which LSAs of the peer are missing from the local LSDB.
Then, they send (link state request) LSR packets to request the missing LSAs. An LSR packet contains the
digests of the missing LSAs.
- H3C SR6600-X H3C SR6600 H3C WX6000 Series Access Controllers H3C WX5000 Series Access Controllers H3C WX3000 Series Unified Switches H3C LSWM1WCM10 Access Controller Module H3C LSWM1WCM20 Access Controller Module H3C LSQM1WCMB0 Access Controller Module H3C LSRM1WCM2A1 Access Controller Module H3C LSBM1WCM2A0 Access Controller Module