[置顶] linux/Unix tips

Direct boot eXR ISO by iPXE

The article should applies to all eXR platform, include ASR9k, NCS5500, NCS6k. The output information maybe different by diff platform, but the iPXE method should same. Btw in eXR, if you want to recovery password, will require iPXE.

Enable HTTP Service at linux

[root@nso exr]# python -m SimpleHTTPServer
Serving HTTP on 0.0.0.0 port 8000 ...

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Segment Routing Microloop Avoidance – 微环避免

对于SR的微环避免,很多人不是特别清楚细节,所以我将在此简单总结下,希望对阅读此篇文章的人有所帮助,我会围绕以下几个话题展开讨论:

  • 微环路是什么?微环避免能做什么?
  • 微环避免跟TI-LFA有什么关系?
  • 微环避免和TI-LFA同时存在的情况下,是否都会有作用?

为了方便大家理解,我将用一个topology来讨论我们今天涉及的所有内容,关于这部分更详细的内容,可以参阅SR卷一的9.10章节,以及SR卷二的8.11.1章节;另外此分析只作为问题验证说明,不能直接拿到现网使用,如40s的delay等,这些需要根据IGP的Scales以及硬件的收敛性能来做调整

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Telemetry Solution Demo with IOS XR

I put a telemetry demo to youtube at last year, but no more time summary… now I summaried in the article, will help you to easy build up the solution. Due to original testbed had changed, so follow some info maybe change, but all procedure should same. And XR configuration file is original. Demo video at this link: https://www.youtube.com/watch?v=E5UlZByLA1c 

Install Grafana and Influxdb by Docker

docker run -d -v grafana-storage:/var/lib/grafana -p 3000:3000 grafana/grafana:5.4.3
docker run -d --volume=/opt/influxdb:/data -p 8080:8083 -p 8086:8086 tutum/influxdb

Install Pipeline

git clone https://github.com/cisco/bigmuddy-network-telemetry-pipeline.git

Config Pipeline

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手机/平板到NAS的速率测试

问题及解决

根据如下拓扑,用iphone和ipad查看nas的高清资源总是卡,低于5mbps码率的资源没问题,当网线连接时,50mbps码率的视频也没问题,所以严重怀疑wifi出了问题,但又不好查哪里的问题,我在AppStore上找了一圈,也没有一个像样的wifi 分析软件,即使收费也能接受呀。。。

Iphone/Ipad — <wifi 5g> — wrt1200ac —<GE>—918+

问题现在已经解决了,由于我的wrt1200ac刷的是OpenWRT,开源的wifi驱动不稳定,导致时不时的卡。我在918+上部署了docker版本的speedtest,从iphone/ipad上测试了下tcp性能,发现测不出问题,速率都挺正常(只给最终结果,无法显示平均还是最大),如下:

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How to upgrade eXR by one cmd “install replaced” | NCS5500

Awesome upgrade cmd for eXR, that will help customer simplify upgrade procedure and do upgrade automation! Feature release from 652. Just tested and summarized.

I summarized normal upgrade eXR version by install add/prepare/active at former: Upgrade/Install Packages in eXR. For the article, will summary how to upgrade by install replaced.

“Install replaced” is a new cmd that help customer upgrade only by one cmd, don’t need to add/prepare/active steps, that only support by GISO. What is GISO? That is an image bundle, customer can flexibly customize the image, e.g only bundle: ISIS rpm + mini iso + k9 rpm + configuration to one GISO, more GISO information, please check CCO Doc: Flexible Packaging Configuration Guide for Cisco NCS 5500 Series Routers

PS: “Install replaced” that will not affect running configuration, and auto removes inactive rpm, and commit.

Build GISO

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