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Anonymous users2024-02-06Next, I will mainly introduce the routing protocol for you.
and routing tables.
When it comes to routing protocols, the first thing that comes to mind is dynamic routing and static routing.
Routing protocol concept.
Routers provide a mechanism for heterogeneous network interconnection to implement data packets on a network.
Send to another network. A route is the path information that directs the IP packets to be sent. A routing protocol is a pre-agreed regulation and standard in the process of sending routing guidance IP packets.
Classification of routing protocols1. Classification according to the method of acquisitionLink Layer Discovery:
Direct routes. Static Routes:
Normal routes, default routes.
Dynamic routing: RIP, EIGRP, OSPF, BGP, ISIS, and ODRSecond, pressIP addressType classification
There is a class: ripv1
Classless routes: EIGRP (Cisco private), OSPF, ISIS, BGP, ODP (Cisco private) OSPF has a maximum of 10,000 routes.
3. Algorithm according to the agreementDistance vector: (dv).
rip、bgp
Link status: OSPF, ISIS, and ODR
Hybrid: EIGRP
Fourth, press ASInterior Gateway Protocol: (IGP).
rip eigrp ospf isis
External Gateway Protocol:
There are several ways to obtain the BGP routing table:
1. Link layer discovery.
Learn the route of the local direct connection, as long as the interface is up
up (physical layer.
and protocol layer), a direct route will be generated in the routing table (the interface has an IP address);
2. Static route learning.
Routes are manually added by the administrator.
3. Dynamic routing learning.
Based on changes in network structure or traffic, routing protocols automatically adjust routing information to discover the best path.
The above are the three classification methods of routing protocols and the way to obtain routing tables, I hope to help you.
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Anonymous users2024-02-05Commonly used routing protocols include RIP, IGRP (CISCO private protocol), EIGRP (Cisco private protocol), OSPF, IS-IS, and BGP.
1. RIP features: It is a dynamic routing protocol, based on the distance vector algorithm, using the hop count as the measurement standard. It has low requirements in terms of bandwidth, configuration, and management, and is mainly suitable for smaller networks.
Principle: After the router runs RIP, it will first send a route update request, and the router that receives the request will send its own RIP route in response. After the network is stable, the router periodically sends route updates. When a RIP update packet arrives, the receiver router compares each item in its RIP routing table with its own RIP routing table and corrects its RIP routing table according to the distance vector routing algorithm.
2、 eigrp
Features: Fast convergence can be achieved. Routers running EIGRP store the routing tables of their neighbors, which can quickly adapt to changes in the network; EIGRP sends partial updates instead of periodic updates, and only when the routing path or metric value changes; Support a variety of network layer protocols; use multicast and unicast; Support variable-length subnet mask; Seamlessly connect data link layer protocols and topologies.
Principle: The Cisco proprietary protocol combines link state and distance vector routing protocols, and uses the diffusion correction algorithm (dual) to achieve fast convergence, which can reduce bandwidth usage without sending periodic route update information.
3、ospf
Features: OSPF is suitable for a wide range of networks; multicast-triggered updates; Fast convergence speed; Use overhead as a measure; The OSPF protocol is designed to avoid routing loops. Under an algorithm that uses the shortest path, the link state in the route is received and the path is generated, so that no loop is created.
Principle: OSPF means that two adjacent routers become neighbors by sending packets in the form of missing traffic, and then the neighbors send link status information to each other to form an adjacency relationship, and then each calculates the route according to the shortest path algorithm, puts it in the OSPF routing table, and preferably adds the OSPF route to the global routing table after comparing it with other routes.
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Anonymous users2024-02-04When it comes to routing protocols, the first thing we think of is dynamic routing and static routing, so how many classification methods are there for routing protocols? Let's take a look.
Routing protocol concept.
Routers provide a mechanism for heterogeneous network interconnection to transfer packets from one network to another. A route is the path information that guides the transmission of IP packets. A routing protocol is a pre-agreed regulation and standard during the transmission of routing guidance IP packets.
Classification of routing protocols
1. Classification according to the method of acquisition
Link Layer Discovery:
Direct Routes Static Routes:
Common routes, preset routes.
Dynamic routing: RIP, EIGRP, OSPF, BGP, ISIS, and ODR
Front oak.
2. Classification according to IP address type
There is a class: ripv1
Classless routes: EIGRP (Cisco private), OSPF, ISIS, BGP, ODP (Cisco private) OSPF has a maximum of 10,000 routes.
3. Algorithm according to the protocol
Distance vector: dv
rip、bgp
Link status: OSPF, ISIS, and ODR
Hybrid: EIGRP
Fourth, press AS
Internal gateway protocol: IGP
rip eigrp ospf isis
External Gateway Protocol:
There are several ways to get the BGP routing table:
1. Link layer discovery.
Lack of regret to learn the route of the local direct connection, as long as the interface is up
UP physical layer and protocol layer, a direct routing interface with IP address will be generated in the routing table.
2. Static route learning.
Manually added routes by the administrator.
3. Dynamic routing learning.
The above is how to get the route table, I hope it can help you.
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Anonymous users2024-02-03In network communication, routing is a term at the network layer that sends a path from a network device to a destination; To put it simply, packets are transmitted from the source port to the destination port. (Directions to the destination).
2.Route classification
3.Classified according to the scope of action
4.Classification is based on routing algorithms
The router relies on two kinds of "tables" in the process of packet processing - routing table and forwarding information, the routing table is used for route selection and the fib table is used for **.
1.Routing table:
Local core routes and protocol routing tables.
A: Contents: Save the current best protocol routes (the best routes are determined by routing protocol priorities and metrics) to the destination
B: Function: The best route is delivered to the FIB table and the FIB table is generated.
A: Content: All routing information that has been discovered by the protocol.
b: Function: Compare the best routes to join the routing table, and inject other routing protocols when the routes are redistributed.
Forwarding information
Special fields
(1) flag: **flag, which may be a combination of multiple letters
（2）timestamp：
Timestamp: indicates the time that the entry has existed, in s-seconds.
(3) tunnelid
1.Foreword
2.Routing protocol precedence
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Anonymous users2024-02-02The following routing protocols are: RIP, IGRP, EIGRP, OSPF, IS-IS, and BGP.
RoutingProtocol is an online protocol that specifies the mode of packet forwarding. The main node device of the Internet network is the router, and the router receives the data through the routing table.
Policies can be manually specified (via static routing, policy-based routing, etc.). In networks with smaller scales, there is nothing wrong with manually specifying policies. However, in large-scale networks (such as multinational enterprise networks and ISP networks), if the ** policy is manually specified, it will bring a huge workload to the network administrator, and it will become very difficult to manage and maintain the route table.
In order to solve this problem, dynamic routing protocols came into being. The dynamic routing protocol allows routers to automatically learn from the networks of other routers and automatically update the routing table when the network topology changes. Network administrators only need to configure dynamic routing protocols, which greatly reduces the workload compared to manually specifying ** policies.
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