1. If the next hop cannot be reached, do not consider2. Select a route with the maximum weight.3. If the route has the same weight, use the route with the highest local priority.4. If you have the same local priority, the BGP Route from the vrobgp is preferred.5. If there is no BGP Route from the vrobgp, select the route with the shortest AS length.6. If all the routes have the same AS length, select the ro
What is the next hop of a BGP third party? Compare the next hop of the route from which the router sends the route with the outgoing interface. If the route is in the same CIDR Block, the next hop of the route remains unchanged. Let's take a look at the following example: www.2cto.com R1, R2, and R3 routers. The interface IP addresses are 10.1.1.1/10.1.1.2 and 10.1.1.3 respectively. R1 and R2 run IBGP, R1 and R3 run EBGP, there is a loopback2 on R2 an
Experiment topology:
R1 configuration:
R2 configuration:
R3 configuration:
Verify:
From the BGP general rule 1.1.1.0/24 's next hop should be R2 (123.1.1.2) but it has automatically changed to R1 123.1.1.1. This is the third party's next jump. This is a change in the control level.
Route redirection is a change in the forwarding of the data plane, and the next hop does not change. (Refer to My route redirection experiment)
This arti
PHP cannot obtain Referer for troubleshooting and referer for troubleshooting. PHP cannot obtain Referer troubleshooting. referer troubleshooting test results :? Phpecho Test Source: directly load the page br; echoahreftest_cookie.php enter the page abr; echo test source PHP cannot obtain Referer
Chapter 8 JVM performance monitoring and troubleshooting tools (2), jvm troubleshooting
Note: This blog is mainly recorded in "deep understanding of Java Virtual Machine (version 2)"
Note: For details about JVM performance monitoring and troubleshooting tools on the command line, see Chapter 7 JVM performance monitoring and t
Details of several common troubleshooting methods for routers, and details of several troubleshooting methods1. Serial Port troubleshooting
When a connectivity problem occurs in the serial port, in order to eliminate the serial port fault, the show interface serial command is generally used to analyze its screen output report content and locate the problem. The s
Atitit. troubleshooting series ----- troubleshooting when apache cannot be started
Atitit. troubleshooting series ----- troubleshooting when apache cannot be started
You can directly use cli to start httpd and print out detailed information ..
C: \ Users \ ASIMO> "C: \ wamp \ apache2 \ bin \ httpd.exe"
Httpd.exe: S
Linux system-network basic configuration and troubleshooting, and linux basic configuration troubleshooting
In linux, there are three types of network configuration: one is to directly implement the configuration file using command lines on the terminal, and the other is to modify the configuration file, another method is setup text interface settings.
The difference is that after the configuration file is
Although the Linux system is very powerful, stable, but we use the process, if the human operation is not appropriate, will still affect the system, and may even make the system does not boot, unable to run services and other problems. Then this blog post summarizes some common troubleshooting methods, but it is impossible to cover all, can only continue to supplement, update.first, the administrator forgot the password(1), restart the computer, enter
Network troubleshooting and viewing in linux, and network troubleshooting in linux
Basic troubleshooting errors
Troubleshooting must be simple and complex. Some people repeatedly configure the above files, but they cannot access the network. They always think that the system is faulty and want to reinstall the host. Th
MySQL redo deadlock troubleshooting and troubleshooting process analysis, mysqlredo
Problem background
I went to work on Monday. I first asked my colleagues about the test results last week. I was told that MySQL Server hang is in multiple instance scenarios and cannot be tested. The native version does not have this problem, this problem occurs in the new version, so I cannot help but feel at ease. I feel
Java virtual machine performance monitoring and troubleshooting tools, virtual machine troubleshooting
1. jdk command line tool
1) jps: Virtual Machine Process status Tool
Jps [option] [hostid]
Main parameters:
2) jstat: Virtual Machine statistics monitoring tool
Jstat-
Main parameters:
For example, if the gc information of process 8675 is queried twice every 8675 ms, jstat-gc 1000 2
3) jinfo: Java conf
A case for troubleshooting slave database latency in MySQL: mysql troubleshooting
When a customer is inspected today, a core of the cpu of mysqld occupies 100% in the case of no business in the slave database. There is no SQL statement for querying the slow query of the master database.It can be said that the typical single-process replication causes a cpu to be fully occupied. If you know the reason, you c
Record the troubleshooting and resolution of a deadlock, and record the troubleshootingThis is a sad reminder. I remember last week's busy schedule. The goal is to modify some bugs in the code left by another team. This project is used for OLAP analysis, the Logic Server is mainly responsible for metadata operations, such as information displayed on the page, and the Analysis Server is responsible for executing query statements, because they used mond
One troubleshooting-when the disk clearly has space, but it cannot be written in, the disk will be troubleshooting
One week at work today, I finally started to operate and maintain the platform and encountered the first practical error.
Today, I encountered an alarm saying that the disk cannot be written and I checked the disk space.
When df-h is used to find that the disk is not fully written, there is
Oracle lock table troubleshooting example: Oracle lock table troubleshooting
One time a developer directly runs the delete table operating system on the database server during peak hours, resulting in no response for a long period of execution. Then, the SQLPLUS client is closed and the delete statement is run again, this causes the database to run slowly.The query operation knows that it is caused by the l
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