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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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Upgrade/Install Packages in eXR

Seperate RPM Pacakage

Check now version

Due to now version include multi packages, so you must include those packages when you upgrade:

RP/0/RP0/CPU0:R31#show ins ac sum
Fri Mar 29 02:35:01.477 UTC
    Active Packages: 9
        ncs5500-xr-6.6.1 version=6.6.1 [Boot image]
        ncs5500-isis-2.1.0.0-r661
        ncs5500-li-1.0.0.0-r661
        ncs5500-mcast-2.1.0.0-r661
        ncs5500-mpls-2.1.0.0-r661
        ncs5500-mpls-te-rsvp-3.1.0.0-r661
        ncs5500-ospf-2.0.0.0-r661
        ncs5500-mgbl-3.0.0.0-r661
        ncs5500-k9sec-3.1.0.0-r661

Check Storage Space

Whether harddisk/disk have enough space, please remove unuse file and tem file in disk/harddisk

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How to sniffer Dummy VLAN on L2VPN ?

什么是dummy vlan?

由于EVC平台在入端口可以通过rewrite命令剥离VLAN tag,这样导致在PW中没有任何tag,在Type 4时会有问题,两边VLAN的QOS无法传递给对端,所以就有了这个所谓的dummy vlan,它不是一个真正的VLAN,他只是传递一些QOS字段并且占一个位。那么dummy VLAN长什么样?其实大鹏之前的文章里已经详细介绍了EVC的各种行为,我这里只是介绍抓dummy VLAN的“心路历程”以及dummy VLAN的“样子”~

测试Topology:

起始测试环境为VPLS BGP auto discovery + LDP Sig,在76的入向抓包
dummy-vlan-topology

测试步骤

1. 默认Type 5,在CE1 ping 带cos 5,ASR9k-1在AC上不配置rewrite,透传的VLAN是否带着802.1p?根据抓包信息,正常带着802.1p,详细看“bgp-ldp-vlan-cos5.pcapng”;另外有个疑问,既然type 5支持VLAN透传,为什么还要Type 4?答案请看文章结束部分
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PWHE Example on ASR9k

什么是PWHE?Pseudowire Headend,它类似于BVI,由于BVI有很多限制,所以研发了PWHE,它会利用进口的硬件资源,从而执行更多硬件级别的feature,如进出QOS等,而且BVI在一台chassis上只能支持2000个,而PWHE则更多。

那么PWHW/BVI需要部署在什么场景下呢?如下图所示:

pwhe-topology
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ASR9k, GSR VPLS *PVID_Inc issue

跟同事讨论了下关于*PVID_Inc的问题,收益颇丰!估计没几个人能悟出在VPLS中PVID_inc的真谛。
为了验证讨论的内容,特意做下面的实验:

Topology

vpls-pvid-01
天蓝色属于一个bridge-domain vplstest1000;而红色属于bridge-domain vplstest6002
本文只讨论天蓝色的bridge-domain!

测试目的

验证下为什么会有PVID_inc的问题出现,及抓包分析,用有力的证据来验证
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