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zhahong
Cisco Employee
Cisco Employee
Member since ‎11-21-2014
‎09-19-2018
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Spotlight Awards Best Publication
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  • 6 Posts
  • 1 Solutions
  • 20 Helpful votes Given
  • 376 Helpful votes Received
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Certifications
ONEx Agile Fundamentals
Cisco Certified DevNet Specialist - Core
Cisco Certified DevNet Specialist - Core
Cisco Certified DevNet Professional
Support Services Engineer Green Belt
CX Baseline Training
Cisco Certified DevNet Specialist - Enterprise Automation and Programmability
DevNet Class of 2020
Cisco Certified DevNet Specialist - Enterprise Automation and Programmability
DevNet Class of 2020
Cisco Certified DevNet Specialist - Enterprise Automation and Programmability
DevNet Class of 2020
Cisco Certified DevNet Specialist - Enterprise Automation and Programmability
Cisco Certified Internetwork Expert Service Provider (CCIE Service Provider)
Cisco Certified Specialist - Service Provider Core
Cisco Certified Internetwork Expert Service Provider (CCIE Service Provider)
Cisco Certified Specialist - Service Provider Core
Cisco Certified Internetwork Expert Service Provider (CCIE Service Provider)
Cisco Certified Specialist - Service Provider Core
Cisco Certified Internetwork Expert Service Provider (CCIE Service Provider)
Cisco Certified Specialist - Service Provider Core
Cisco Certified Internetwork Expert Data Center (CCIE Data Center)
Cisco Certified Specialist - Data Center Core
Cisco Certified Specialist - Data Center Core
Cisco Certified Internetwork Expert Data Center (CCIE Data Center)
Cisco Certified Specialist - Data Center Core
Cisco Certified Internetwork Expert Data Center (CCIE Data Center)
Cisco Certified Specialist - Data Center Core
Cisco Certified Internetwork Expert Data Center (CCIE Data Center)
Cisco Certified Specialist - Data Center Core
Cisco Certified Internetwork Expert Data Center (CCIE Data Center)
Cisco Certified Internetwork Expert Data Center (CCIE Data Center)
Cisco Certified Specialist - Enterprise Advanced Infrastructure Implementation
Cisco Certified Specialist - Enterprise Core
Cisco Certified Network Professional Enterprise (CCNP Enterprise)
Cisco Certified Network Professional Enterprise (CCNP Enterprise)
Cisco Certified Specialist - Enterprise Core
Cisco Certified Specialist - Enterprise Advanced Infrastructure Implementation
Cisco Certified Specialist - Enterprise Core
Cisco Certified Network Professional Enterprise (CCNP Enterprise)
Cisco Certified Network Professional Routing and Switching (CCNP Routing and Switching)
Cisco Certified Specialist - Enterprise Advanced Infrastructure Implementation
Cisco Certified Specialist - Enterprise Core
Cisco Certified Network Professional Enterprise (CCNP Enterprise)
Cisco Certified Network Professional Routing and Switching (CCNP Routing and Switching)
Cisco Certified Specialist - Enterprise Core
Cisco Certified Network Professional Routing and Switching (CCNP Routing and Switching)
Cisco Certified Network Professional Routing and Switching (CCNP Routing and Switching)
CCNA
Cisco Certified Network Associate Routing and Switching (CCNA Routing and Switching)
CCNA
Cisco Certified Network Associate Routing and Switching (CCNA Routing and Switching)
CCNA
Cisco Certified Network Associate Routing and Switching (CCNA Routing and Switching)
Cisco Certified Network Associate Routing and Switching (CCNA Routing and Switching)
Cisco Certified Network Associate Routing and Switching (CCNA Routing and Switching)

User Activity

【原创】ICMP redirect 报文以及交换机什么时候会发redirect报文

02-28-2018
问题概要：很多时候客户遇到设备的cpu使用率比较高，而且经过判断是由于设备本身在发icmp redirect报文导致的，那么问题来了，设备什么时候会发icmp redirect报文呢，接下来给大家分享一下ICMP redirect 包是如何工作的：路由器通过ICMP redirect message来告知链路上的主机对于某个特定destination的一个更优的路由，例如如下拓扑，R1和R2被连接到和主机H相同的以太网段，主机H的默认网关配置在R1上，主机H发送一个包到R1为了到达远端的目的主机...

【原创】65/45 vss domain-id 配置一致导致的网络不通问题

02-28-2018
问题概要：很多客户在网络中会部署多组vss，而且这些vss会直连在一起，有的客户为了统一，会将所有vss的domain id配置成一样，这样会导致直连的vss直接无法ping 通拓扑：原因：如果两组vss的domain id一样，会造成这这两组直连的vss的svi或者三层接口的mac地址是一样的，因为，65上默认的vss用的是virtual-mac（可以通过show run看到“mac-addressuse-virtual”）这个命令，而一旦用了virtual-mac，这组vss的svi或者三层...

【原创】CAT4500 平台high cpu troubleshooting guide

02-28-2018
问题概要：很多客户在45上经常会遇到一些设备high cpu的问题，并且无从下手，甚至在联系思科开case之前，错过了故障当中收集信息的黄金时段，现分享一些简单的4500 high cpu的TS guide给大家IOS系统下的45的high cpu的处理过程：1、通过show prcoess cpu sort | ex 0.0 定位是什么导致的high cpu，比如99%/90%,那这就说明是中断导致的，一般而言是有异常的流量进到cpu了，接下来的操作就是通过抓取进到cpu的包，关于抓cpu的包...

【原创】如何排查交换机上show interface transceiver没有输出

02-28-2018
问题概要：有一些客户在将transceiver插到某些设备上，能正常转发数据，但是当客户show interface transceiver的时候，输出是空的问题分析：首先，要明确的是，如果想要看到show interface transceiver的正常输出，该transceiver必须得满足如下两个要求：1、至少得有一个transceiver插在机框上并且该module配置了diagnostic monitor2、所使用的transceiver必须得支持DOM(diagnostic moni...

常见的4500 high cpu的一些简单TS guide

05-31-2015
问题概要：很多客户在45上经常会遇到一些设备high cpu的问题，并且无从下手，甚至在联系思科开case之前，错过了故障当中收集信息的黄金时段，现分享一些简单的4500 high cpu的TS guide给大家IOS系统下的45的high cpu的处理过程：1、通过show prcoess cpu sort | ex 0.0 定位是什么导致的high cpu，比如99%/90%,那这就说明是中断导致的，一般而言是有异常的流量进到cpu了，接下来的操作就是通过抓取进到cpu的包，关于抓cpu的包...
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Member Since ‎11-21-2014 12:08 AM
Date Last Visited ‎09-19-2018 02:46 AM
Posts 6
Total Helpful Votes Received 376
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