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OSPF: problems with the adjacent relationship caused by inconsistent MTU

This blog post will introduce in detail the problem of the adjacent relationship caused by inconsistent MTU and the solution. 1. MTU inconsistency (1) When to pay attention to MTU Starting from the Exstart status, the OSPF process follows the Interface MTU field in the DD message from the neighbor. (2) When to ignore DD If the value of the Interface MTU in the received DD message is greater than that of the local Interface MTU, the DD message is ignored. (3) MTU inconsistent results When the In

System upgrade for Routers

If the router has damaged iOS for some reason, does not start properly, or needs to upgrade the current iOS, we can do so in the following ways.(1) First to find the appropriate iOS image file placed in the root directory of TFTP, the IP address of the configuration server is 192.168.1.1(2) in privileged mode, a version upgrade can be done using one of the following commands.i.e.: rouer#copy TFTP flash: (note the colon after flash)Then enter the IP ad

CCNP Learning note 6-routing Section--OSPF comprehensive questions

-redistributionR3:Router OSPF 1Area 2 Nssa no-redistribution4 Special Areas, only Nssa does not automatically generate a default route, the title requires that the default next hop is R3, soR3:Router OSPF 1Area 2 Nssa Default-information-originateR1:sho IP roMetric values can be modified by area 2 Nssa default-information-originate metric 20, but not allowed in the title, so,R3:rouer OSPF 1Area 2 Default-cost 20R1; Sho ip ro os7, increase the lo3=30.1

Wan routing Basics

:Service udp-small-serversService tcp-small-serversHostname Router-Enable secret test-Ip subnet-zeroInterface Ethernet0Description the LAN port link to my local networkIp address 202.96.199.1 255.255.255.0Interface Serial0Description the WAN port link to Router-BIp address 202.98.0.1 255.255.255.252Bandwidx 128Interface Serial1No ip addressShutdownIp domain-name xxx.comIp name-server 202.96.199.2Ip name-server 202.96.199.3Ip classlessIp route 202.97.76.0 255.255.255.255.202.98.0.2Line con 0Line

Vroacl ACL Access Control List

router (config) # access-list 101 permit ip any allows all the router (config-if) through the application to the interface) # ip access-grouup 101 out/in naming Control list configuration instance www.2cto.com create naming Control list router (config) # ip access-list extended xiaoliu name: xiaoliurouter (config-ext-nacl) # deny tcp 172.16.4.0 0.0.0.255 172.16.3.0 0.0.0.255 eq 23 router (config-ext-nacl) # permit ip any application to the interface rouer

Wan routing Basics

Ethernet0Description the LAN port link to my local networkIp address 202.96.199.1 255.255.255.0Interface Serial0Description the WAN port link to Router-BIp address 202.98.0.1 255.255.255.252Bandwidx 128Interface Serial1No ip addressShutdownIp domain-name xxx.comIp name-server 202.96.199.2Ip name-server 202.96.199.3Ip classlessIp route 202.97.76.0 255.255.255.255.202.98.0.2Line con 0Line aux 0Line vty 0 4Password telnet-LoginEndRouter-#Rouer B:Router-

OSPF simple configuration and rationale

, all routers in the zone have the same link-state database.In an OSPF configuration, zones are defined on each interface, respectively.------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------OSPF areaBackbone area: Area0, which is used to connect all other areas within the autonomous system. Responsible for inter-region routing information dissemination.Non-bac

[React Native] Basic IOS Routing--Navigatorios

Inside The app component, we use Navigatiorios to render the compoent:class Githubnotetaker extends Component { render () { return ( Navigatorios Style={styles.container} initialroute={ ' Github Note taker ' , component:main }} /> );} }This is a like rouer. ' Initialroute ': For the initial loading, it'll loads ' Main ' component by default.Whole Code for Index.ios.js:/** * Sample

Understanding of the OSPF LSA

Routing information: LSA1 (in-domain), LSA3 (domain), LSA5 (extraterritorial) Topology Information: Pending completion Summary of OSPF LSA and stub Lsa:1 1: Each router will produce a class of LSA it contains all the link extremely prefix and mask information, link type. 2: Identify your own Route-id number (who generated this LSA) 3: Can not cross ABR, only in the region flooding 4: View the way: #sh IP OSPF database rouer 5: Oneself produce,

C + + template meta-programming one: Basic concepts

meta programmingRefers to the preparation of meta-programs1.4Meta-languageLanguage for writing meta-programs1.5Target languageWriting the language of the target program1.6SummarizeWe write programs in the C + + language, the C + + language is a target language, after processing by the compiler, generates an. obj file, inside the. obj file is the target program, after the linker link, forms an executable program. From the DSL point of view, meta-progr

Atitit. Future trends and evolutionary results of programming languages

Atitit. future trends and evolutionary results of programming languages1 languages, like species, can form evolutionary trees, and branches that have no future will wither and die off. 12 Machine Language 13 assembly Language 24 C language , hardware abstraction Layer 25 High-level language:java,.net cross-platform (OS) abstraction Layer VM 26 DSL Domain programming language ( across programming languages ) 26.1 Implementation Method :: semantic

Thousand recruit Hundred type: Lets your ADSL run faster _ the network surfer

no way, in the ADSL dial-up access to the process, automatic detection ISP supply line status, and according to the actual situation dynamically optimize the MTU value, so that ADSL data transmission efficiency is always in the most ideal state? The answer is yes, you can use the DSL speed tool to help you easily optimize the ADSL maximum MTU value dynamically. Download get DSL SpeedTool, install it in th

The third of Gradle Learning Series--reading and understanding Gradle grammar

the third of Gradle Learning Series--reading and understanding Gradle grammar In the previous article in this series, we talked about the various ways to create a task, and in this article we will learn how to read gradle. Download the GitHub sample code for this article series in the following ways: git clone https://github.com/davenkin/gradle-learning.git Gradle is a declarative building tool. At execution time, Gradle does not sequentially execute the contents of the Build.gradle file, bu

How to Improve ADSL speed

Author: yansy Source: DRL The DSL design concept is that upstream and downstream operations do not affect each other, that is, upstream and downstream operations can reach full load at the same time. However, we often feel like this when using it: When we upload files at full capacity, the downloading will not reach the full load, and the opposite will be the same. This is because ACK has no priority. Let's first review the TCP transmission principle:

Definitions and functions of ADSL Modem settings (3)

current system information is mainly composed of five parts. Let's give a brief introduction to each part. (1) the device displays the basic information and software version of the hardware of the device, the normal running time of the system (starting from the last time the ADSL Modem was restarted), and its running mode. When we upgrade the modem firmware later, we need to know the "software version" of the modem, which helps us to differentiate two different versions of firmware programs. (2

Xtext what?

That's what the Xtext official website says."Building your own domain-specific languages have never been so easy. Just put your grammar in place and don't only get the working parser and linker but also first class Eclipse support. "It is never so simple to create your own DSL. You just have to write your grammar, and then leave the rest to Xtext to do it (including parser. Linker and seamless support in eclipse).To learn xtext, you need to know at le

The nature of LISP

unit tests, and send emails. For specific questions, such as constructing software projects, the use of these operators can greatly reduce the number of less code.Increase code clarity and reusability. Explanatory XML can easily achieve this goal. XML is a simple data file that stores hierarchical data. In Java, the hierarchy is fixed (you will soon see that the lisp situation is completely different ), we cannot achieve this goal. Maybe this is exactly where ant is successful. Java cannot perf

Software factory, another buzz word?

Http://www-106.ibm.com/developerworks/blogs/dw_blog_comments.jspa? Blog = 317 entry = 67637 ca = dgr-jw22MSrejectsUMLMS has recently introduced the concepts of software factory and DSL (domain definition language), and has also been attacked by many people. This article is from Grady, one of the three friends of UML. Here are some points in the article and the root post.There's no doubt that reuse at the level of design patterns or, even better, ver

Networking Mode and Application Mode of WiMAX technology

The full name of WiMAX is Microwave Access for global intercommunication Worldwide Interoperability for Microwave Access). After combining this technology with Microwave devices that require authorization or authorization-free, the broadband wireless market will be expanded to improve the recognition of enterprises and service providers. WiMAX is the 802.16 standard, or Broadband Wireless Access to Broadband Wireless Access, BWA standard ). It is a wireless MAN (WMAN) technology. It is a new air

What is Xtext, Xtext

What is Xtext, Xtext This is what Xtext says on its official website. "Building your own domain-specific languages has never been so easy. Just put your grammar in place and you not only get the working parser and linker but also first class Eclipse support ." Creating your own DSL is never that easy. You only need to write your syntax, and then hand the rest to Xtext (including parser, linker and seamless support in Eclipse ). To learn Xtext, you mu

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