January 2023
Intermediate to advanced
458 pages
14h 16m
Chinese
Content preview from 可编程网络自动化
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
网络自动化
｜
19
来看一个
非常
基础的
IOS
设备数据采集示例，其中用到了
Python
库
netmiko
，第
7
章会详
细介绍该库。
from netmiko import
ConnectHandler
device = ConnectHandler(device_type='cisco_ios', ip='csr1',username='ntc',
password='ntc123')
output = device.send_command('show version')
print
(output)
最好的地方在于变量
output
中包含了
show version
命令的结果，你可以根据需要对其进
行解析。
在给出的例子中，我们描述的是从设备
拉取
（
pull
）数据，这种方式未必放
之四海而皆准，但仍适用于许多环境。需要注意的是，很多新设备已经开始
支持
推送
（
push
）模式——通常也称为流式遥测（
streaming telemetry
）。 在
该模式下，设备自身会将接口状态等实时数据主动发送至应用程序服务器。
当然，所有这些可能都需要前期做一些定制工作，但总的来说还是值得的，因为采集到的
是符合需求的数据，而不是特定工具或厂商硬塞给你的那些。况且，这不正是你阅读本书
的原因吗？
网络设备中埋藏着大量的静态数据和临时数据，你可以使用开源工具或者自己打造工具来
访问这些数据。此类数据包括
BGP
表中的活跃条目
、
OSPF
邻接关系、活跃邻居、接口
统计信息、特定的计数器和重置，甚至是新的平台上专用集成电路（
Application ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.