vlsm subnetting

the internet, and the host number identifies a host on the subnet. When an Internet address is decomposed into two domains, it has an important advantage: when IP packets reach another network from one network on the Internet, the selection path can be based on the network rather than the host. This advantage is particularly noticeable in large networks because the routing table stores only network information rather than host information, which can greatly simplify the routing table 　　Sub-Net

all configuration interfaces. However, RIP is measured by the number of hops. IGRP establishes the optimal route path with multiple factors; Bandwidth), Delay), Reliability), and LOAD) but its disadvantage is that it does not support VLSM and discontinuous subnets. IGRP Configuration: Routerconfig) # router igrp 100100 is the autonomous system number)Routerconfig-router) # network-numberRouterconfig-router) # exit Note: 1) The valid range of the seri

static supernetwork to resend the static route to BGP. Static Routing overnetworks are also used when routing protocols that support VLSM are redistributed to those that do not support VLSM. 3. Default route: use the default route when there is no targeted target route. If there is no default route, the group will be lost. IGP commonly uses default routes to connect to the BGP domain, and also uses default

nodes when selecting the optimal path between two points. It does not consider network congestion and connection rate. Protocols are usually used in small network environments with simple network architecture. Currently, RIP has three versions: r00001, r00002, and RIPng. Working principle: the RIP Router broadcasts its route table to other routers every 30 seconds. This type of broadcast can cause a large amount of data transmission, especially when a large number of routers exist in the networ

hops. The Internal Gateway Routing Protocol has stable functions, similar to the Internal Gateway Routing Protocol, such as the suppression of timers, horizontal split, and toxicity reversal. The scheduled time is as follows: 270 seconds are invalid, 280 seconds are blocked, and 630 seconds are refreshed. The Internal Gateway Routing Protocol also includes the mechanism that affects route selection and load balancing of non-equivalent values. IGRP/VPN is measured as follows: ◆ Bandwidth ◆ Relay

that time, is to regularly update routes from all configuration interfaces. However, RIP is measured by the number of hops; IGRP uses multiple factors to establish optimal routing paths; Bandwidth, latency, Reliability, and LOAD) but its disadvantage is that it does not support VLSM and discontinuous subnets ｡ IGRP Configuration: Router (config) # router igrp 100 (100 is the autonomous system number) Router (config-router) # network-number Router (co

configuration interfaces. However, RIP is measured by the number of hops. IGRP establishes the optimal route path based on multiple factors. Bandwidth ), latency, Reliability, LOAD, and other factors, but its disadvantage is that it does not support VLSM and discontinuous subnets ｡ Routing Protocol configuration-IGRP Configuration Router (config)# Routerigrp100 (100 is the autonomous system number)Router (config-router)# Networknetwork-numberRouter (

First (OSPF), OSPF, RIPV2, intermediate system to intermediate system IS-IS), and Border Gateway Protocol version 4BGP4 ), the subnet mask VLSM with different mask lengths is called variable lengths in the same primary network ). The classless routing (classless Routing) protocol supports VLSM. Therefore, you can set a subnet mask more effectively to meet the needs of different subnets for different number

. Response message responseThe request message can request information for the entire routing table, or it can request only certain routing information. Typically, when RIP is on, a packet with a request message is emitted to each interface of the enabled RIP protocol.The response message is used to send the router's route to another router. Usually the cycle is sent. Features of RIP-V1:• Send updates at broadcast address 255.255.255.255.• The route is automatically aggregated into the main

configure the passive interface in the routing process mode ｡ 2. Static Routing, Which is manually configured and applicable in small network segments, such as dial-up networks. Static Routing such as redistribution between BGP and IGP is also commonly used, for example, you can define a static supernetwork to resend a static route to BGP. Static Routing overnetworks are also used when routing protocols that support VLSM are redistributed to those th

address is summarized at 192.16.1.0/24 Vrob B also has two interfaces. One is in the main network 128.200.0.0/16, and the other is in the network 192.16.1.0/24. When B receives the 128.200.2.0 subnet, he will try to send them out. Because the interface mask is 30 bits), only the summarized route 128.200.0.0/16 can be sent. RIP-2Supports VLSM. The router includes a subnet mask in the route update so that the router can handle

No category (now)Classless Inter-Domain Routing (Classless inter-domain Routing, CIDR) is a method of classifying IP addresses for assigning IP addresses to users and for efficiently routing IP packets over the Internet.CIDR uses the variable eldest-son netmask (vlsm,variable Length Subnet masking) to assign IP addresses according to individual needs, rather than following a rule that is a network-wide convention. Therefore, the division of the networ

routing updates? , the RIP is measured by the number of hops, and the optimal routing path is established by many factors igrp. Bandwidth (bandwidth), latency (Delay), Reliability (reliability), payload (load), etc. but its disadvantage is that it does not support VLSM and discontinuous subnets? IGRP configuration of routing protocol configuration Router (config) #routerigrp100 (100 for Autonomous system number) Router (config-router) #netw

Because the IP address is more nervous, so in the WAN link summary address allocation generally take the following 3 kinds of strategy: 1. Use VLSM 2. Use private address 3. Use the first variable-length subnet mask (VLSM) without a numbered IP (IP unnumbered) when using this, there must be no routing between classes, otherwise, there will be an error in the routing update information, and it is still using

Tags: cisco CCNA eigrpEIGRPin order to enhance the internal Gateway routing protocol, it can also be called the enhanced Internal Gateway routing protocol. EIGRPcombining the link state and the distance vector type routing protocolCiscoproprietary protocol using a dispersion correction algorithm (DUAL) for fast convergence, you can reduce the bandwidth footprint by not sending periodic routing update information, whileEIGRPThere are three tables: the Neighbor Relationship table (in relation to e

advantages of the Distance Vector and link status routing selection protocol and uses the scattering update algorithm (DUAL ), high routing performance is achieved. The following describes the features of the Protocol. The router that runs the VPN gateway on the vroeigrp to form a neighbor relationship and exchange route information. The neighboring routers maintain the relationship between each other by sending and receiving Hello packets. The default sending interval of the Hello packet is 5s

OSPF (OpenShortedPathFirst): a dynamic link routing supporting OSPF (Open Shorted Path First ): Is a dynamic link route that supports VLSM (variable-length mask transfer ). The multicast method is used only when the link changes, and the cost is used for routing. Create a database for all links and use the shortest path algorithm to determine each route. the convergence speed is fast and there is no limit on the number of hops. The 8th-bit MAC addre

Metric ). In RIP, the number of hops from a router to a directly connected network is 0, and the number of hops from one router to another is 1. To limit the convergence time, RIP requires the metric value to be 0 ~ An integer between 15 and 16. The number of hops greater than or equal to 16 is defined as Infinity, that is, the destination network or host is inaccessible. AD = 120) To improve performance and prevent the generation of routing loops, RIP supports horizontal Split Horizon) and rou

configure the passive interface in routing process mode 2. Static Routing, Which is manually configured and applicable in small network segments, such as dial-up networks. Static Routing such as redistribution between BGP and IGP is also commonly used, for example, you can define a static supernetwork to resend a static route to BGP. Static Routing overnetworks are also used when routing protocols that support VLSM are redistributed to those that do

destination.B. Configuration: Use the global configuration command router protocol.C. Distance Vector Routing: All routers regularly send the route table or a part of the route table to the neighbor router.D. link Status routing: when the status of each vro changes at its interface link, the changed status is sent to all other vrouters or a part of the network, which is called a region.E. Advanced Distance Vector Routing: the Protocol only sends the changed information, which is similar to the