Shulou(Shulou.com)06/01 Report--

Through the previous three experiments, we have been able to use python to operate cisco devices through telnet, and then start a new phase of experiments.

Experimental purpose: network inspection, and then store the information in the database

This experiment needs to expand the new topology again, and the experimental environment is changed to ubuntu, and the subsequent expansion will be done in the linux environment. The local address is 10.10.10.142, and six routers are controlled by two management switches and their addresses are assigned

R1

10.10.10.101

R2

10.10.10.102

R3

10.10.10.103

R4

10.10.10.104

R5

10.10.10.105

R6

10.10.10.106

Configure an IP address for each Devic

Due to the need for batch configuration, you can use the global send function of CRT to deploy batch commands.

After all the vty is deployed, three devices will be opened to reduce the machine burden, and then further development will be carried out.

Verify connectivity

Found a list of neighbors

Verify the execution results of the code

The next task is to grab packets by the system and analyze these packets. Our task is to record the neighbor relationship in the form of grabbing cdp packets, and send an alarm message if the neighbor relationship changes.

Let's talk about the idea here: get the accepted string and process the information, that is, only receive R1 Fas0/0 Fas0/0 and store it in the local database, so you need to set up a neighbor table in the database to store the router number, the local connection number and the port number. Here two databases are installed and stored in two places, one is disaster preparedness, the other is to do experiments later to test the difference in running efficiency between relational database and non-relational database.

Step 1: intercept information

Process this string of characters:

'show cdp neighbors\ r\ nCapability Codes: r-Router, T-Trans Bridge, B-Source Route Bridge\ r\ nS-Switch, H-Host, I-IGMP, r-Repeater\ r\ n\ r\ nDevice ID Local Intrfce Holdtme Capability Platform Port ID\ r nR1 Fas0/0 172nd R S I 3640 Fas0/0\ r\ nR6 Fas0/0 144R S I 3640 Fas0/0\ r\ nR4 Fas0/0 170R S I 3640 Fas0/0\ r\ nR2 >'

The string processing method you plan to use this time is slicing, and you can also try a method similar to regular expressions later.

Waiting for 2 seconds is the neighbor information returned by the receiving device.

The processing is finished, and it's very nice.

Step 2: design the relationship table and build the table

Design mysql

Database:NDB

Table:cdp_nei

RID

Char

Local_Int

Char

Port_ID

Char

First_record

Datetime

Change_record

Datetime

Here, a table has been established in ndb in mysql, which stores the information of cdp neighbors. Based on the current topology, it can be predicted that when all routers are running, the information entry in the table should be 6-7-42.

First_record is used to record the time when the data item was first recorded, while Change_record automatically records the time each time the data item is modified. When querying, you can check the time when the data item is modified. If there is a change, you can directly prompt the link to jitter.

Step 3: write to the database

Let's have an interview in the debugging world. The order can be passed.

View the effect

After that, you can write relevant instructions in the code, but before you do that, do an exciting thing: wear clothes and pants before you run away!

Code:

This is the initial version, which is later encapsulated in a separate class for development convenience

After writing, remember to synchronize the data before you can find the relevant information in the database.

Write success and enjoy it.

Step 4: traverse the neighbor information of all devices

Idea: log in to each device by telnet, use show cdp nei on it, and then collect the peer port information and write it to the database

Here we can dynamically store the information in the database. In the next experiment, we will alert the error information by writing a script.

Notes on the installation tutorial for python-mysql and the use of the mysqldb toolkit link in the comments

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