Archive

标签为 ‘L2VPN’的文章

Type1:Ethernet A-D Route

Type1 能做什么?

  • Aliasing  -> 防环
  • Mass Withdraw of addresses -> 快速收敛
  • SH/AA MH Indication -> 更有效的负载均衡
  • Advertising Split-Horizon Label -> 每站点Policy

Topology

完整阅读

ASR9k PBB-EVPN Troubleshooting and over GRE

Introduction

Customer run PBB-EVPN on 9001 NV at different site, and interconnect their different DC. Due to only have 1 interconnect link between 9001 NV, so they need a standby link that though Internet by GRE. After checked in lab, EVPN over GRE looks like same as L2VPN over GRE (support from 4.3 on ASR9k), and I had completed test for EVPN over GRE in lab. I will share config and topology.

But please attention: After checked, PBB-EVPN over GRE not offical release, so not suggest do it for customer. For the articles, not only talk about EVPN over GRE, and include how to troubleshooting PBB-EVPN

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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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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
完整阅读

ASR9k Mapping Behavior for “translate 1-to-1 dot1q”

Topology

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

测试目的

验证下ASR9k上的mapping行为 “translate 1-to-1 dot1q”
完整阅读

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