Hello, this is the Network Technology Alliance site. In large-scale network architectures, many routing protocols have been developed to achieve efficient data transmission and routing management. Open Shortest Path First (OSPF) is an Interior Gateway Protocol (IGP) that is widely used in enterprise networks and Internet Service Provider (ISP) networks. This article will focus on […]
Tag: spf
ospf irregular area division, database table, LSA optimization, ospf extended configuration
Hua subdirectory ospf irregular area 1. Non-backbone areas away from the backbone 2. Discontinuous backbone Irregular area solutions 1.tunnel-point-to-point GRE 2.ospf virtual link 3. Multi-process bidirectional re-publishing (recommended) ospf database table Common types in ospf database Optimize ospf’s LSA and reduce the amount of LSA updates 1. Manual aggregation—–Reduce LSAs in the backbone area 1. […]
OSPF+MSTP+VRRP+DHCP networking experiment
Experimental requirements: pc1-pc4 requires obtaining the dhcp specified ip from r4 sw1-sw4 uses mstp + vrrp protocol to achieve load sharing ar1-ar2-s1-s2 uses ospf to implement three-layer communication ar4 is set as dhcp server s1-s2 acts as a relay for the dhcp server SW1 <sw1>display current-configuration # sysname sw1 # undo info-center enable # vlan […]
Routing attack (ospf attack) and C/C++ code implementation
Open Shortest Path First (OSPF) is one of the most widely used intra-domain routing protocols. Unfortunately, it has a number of serious security issues. Forgery on OSPF is one of the most critical vulnerabilities that can lead to routing loops and black holes. Most known OSPF attacks are based on forging link state advertisements (LSAs) […]
A preliminary understanding of the general content of OSPF (Lesson 3)
1 Classification of routes Directly Connected Route refers to a route that directly connects two adjacent network devices in the network topology, also called a direct route. If two devices belong to the same IP network address, then they are directly connected devices. The direct routing table refers to a table generated by the computer […]
HCIP-Link State Routing Protocol OSPF (2)
OSPF routers in the same area have completely consistent LSDBs. Within the area, OSPF uses the SPF algorithm to complete route calculations. As the network scale continues to expand, routers consume more and more memory and CPU resources to complete routing calculations. Zone division can alleviate the pressure on routers to a certain extent. In […]
HCIP-Link State Routing Protocol OSPF (1)
Foreword: Routers forward packets according to routing tables, and routing table entries can be generated through manual configuration and dynamic routing protocols. Static routing uses less bandwidth than dynamic routing and does not occupy CPU resources to calculate and analyze routing updates. When the network structure is relatively simple, you only need to configure static […]
P1144 Shortest Path Count (SPFA) (cover enclosed)
Shortest path count Description of topic give a N N N vertices m m An undirected and unweighted graph with M edges, with vertices numbered 1 ~ N 1\sim N 1~N. ask from apex 1 1 1, there are several shortest paths to each other point. Input format The first line contains 2 2 2 […]
[HCIP] ensp–ospf experiment 2
Experimental requirements Experiment topology and IP address planning Basic configuration R1 [r1]interface g0/0/0 [r1-GigabitEthernet0/0/0]ip address 172.16.32.129 255.255.255.128 [r1] interface LoopBack 0 [r1-LoopBack0]ip address 172.16.33.1 255.255.255.128 [r1] ospf [r1-ospf-1] area 0.0.0.1 network 172.16.32.129 0.0.0.0 network 172.16.33.1 0.0.0.0 stub R2 [r2]interface g0/0/0 [r2-GigabitEthernet0/0/0]ip address 172.16.32.130 255.255.255.128 [r2] interface LoopBack 0 [r2-LoopBack0]ip address 172.16.34.1 255.255.255.128 [r2] ospf [r2-ospf-1] […]
ESPFriends’ ESP32 Model Deployment and Training Adventures (1)
Deployment and construction of development environment Super Little Star: Time flies so fast ESPFriends Maker Salon has been held twice in Wuhan. There are engineers in the industry, students from colleges and geeks here. The “big pit” can also get solutions from friends. I hope that the event can be better and better. Here I […]