17 new OSPF feature

1. OSPF with BFD (Bidirection forwarding Dection)
Loss of neighbor relationship detected in time units in microseconds
Faster hello and dead interval. (dead interval = 1 s)
2. OSPF Link State database overload protection
Prevent lsdb from exceeding the expected size
3. MPLS LDP-IGP synchronization and autoconfiguration
Synchronization between LDP and IGP
Automatic Configuration of LDP
4. Interface Based OSPF enable
OSPF can be activated in interface mode, instead of configuring the network command in Router mode.
5. RFC 3623 OSPF Graceful Restart
RFC-defined OSPF Graceful Restart (using grace lsa). Previously, Cisco used its NSF
6. Quantum based CPU releasing
When a large number of OSPF packets or LSA packets are received, the CPU is not used in SPF. Algorithm On
7. OSPF Hello Process Optimization
Enable OSPF to support more neighbor and faster timer (more than 700 neighbor, dead interval = 1 s)
8. Tunable OSPF queue sizes
The adjustable OSPF queue enables faster OSPF convergence.
9. Interface scoped debugging
More user-friendly debug
Debug condition interface fa0/0
Debug ip ospf adjacency
10. OSPF and multi-topology routing
Multiple logical topologies can be defined in a physical topology (using the new LSA, MTR-router LSA). Each service can also go through different links and supports backup topology.
11. OSPF local rib and prefix prioritization
OSPF has its own local rib. The local rib will be synchronized to global rib only after the SPF is calculated.
Priority can be set for different prefixes. The highest priority is set to be inserted into global rib first, followed by/32 prefix, followed by other prefixes.
12. OSPF link and prefix attributes
Prefix has attributes, which means it is easier to control, and you can even set prefix priority convergence.
13. Generalized TTL security mechanisms
The router only accepts OSPF Packet With TTL = 254, thus avoiding multiple hops attack
14. OSPF prefix Suppression
The address of the previously activated OSPF interface will be released. Now you can set not to release these addresses.
15. OSPF Graceful Shutdown
Flexible shutdown to minimize the network interruption time
16. ospfv3 fast convergence
V3 can also, like V2, do not immediately perform SPF computing when the network oscillates.
17. OSPF event logging
OSPF events can also be recorded in logs.