标签 交换机 下的文章 - UU实验室
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小陈

不怕神一样的对手,就怕猪一样的队友。
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搜索到 3 篇与 交换机 的结果
2021-01-19

H3C交换机VRRP配置实例

H3C交换机VRRP配置实例
0x01 理论讲解VRRP全称(Virtual Router Redundancy Protocol)虚拟路由器冗余协议。简单来说,VRRP是一种容错协议,它保证当主机的下一跳设备出现故障时,可以及时的由另一台设备来替换,从而保持通讯的连续性和可靠性。默认情况是指针对IPV4的VRRP,在IPV6中使用VRRP3.VRRP实现了对设备IP地址的冗余功能,防止了单点故障造成的网络失效,VRRP本身是热备形式,但是可以通过互相热备实现路由器的均衡处理。虚拟路由器的IP Address虚拟路由器使用IP地址,可以用其接口上的真实地址作为虚拟路由器的IP地址,也可以单独配置一个IP地址。虚拟路由器的MAC地址00-00-5e-00-01-XX, 00 00 5e由IANA分配。00 01为分配给VRRP协议的地址块,XX为VRRP的虚拟路由器标识,该映射在一个网络中提供最多255个VRRP路由器组。VRRP报文结构VRRP协议只有一种报文,即主路由器定时向其他成员发送的组播报文,VRRP协议报文封装在IP报文中,通过组播方式进行发送。VRRP报文的二层封装:VRRP报文的源MAC:00...
小陈
2021-01-19

华三

2021年01月19日
46 阅读
0 评论
2021-01-18

Cisco交换机设备配置镜像端口

Cisco交换机设备配置镜像端口
0x01 前言镜像是指将经过指定端口(镜像端口)或者指定VLAN(镜像VLAN)的报文复制一份到另一个指定端口(观察端口),然后转发到网络监控设备,供网络管理员进行网络监控与故障管理。0x02 用途故障定位在系统运行过程中,可能由于系统软件处理异常、网络设备硬件故障、计算机病毒或用户不正常使用等原因造成网络上流量异常或产生错误报文。为了在不影响系统运行的情况下对网络上的报文进行分析,以定位故障产生的原因,这时候就可以使用镜像。业务可视为了更好的理解企业内部业务流量模型, 在网络汇聚或核心交换机上,对业务流量进行镜像,以便在不影响正常业务的情况下,使企业各类应用清晰可视。 比如说, 多少用户在上班时间访问QQ; 员工访问公司内部服务器的访问量排名情况。入侵检测为了发现各种攻击企图、攻击行为或者攻击结果,以保证网络系统资源的机密性、完整性和可用性, 在企业的上行接口,将所有出入的流量镜像到一个IDS服务器上,进行实时分析。比如外部访问公司服务器的访问量激增,分析一下这些是不是属于攻击报文等。0x03 配置举例查看交换机端口的基本情况,输入命令 show ip int bri,可以查看...
小陈
2021-01-18

思科

2021年01月18日
45 阅读
0 评论
2020-12-31

POE(Power Over Ethernet)供电原理

POE(Power Over Ethernet)供电原理
0x01 前言近年来,PoE供电技术的发展势头越来越强劲,凭借简化用电设备的安装和部署、节能,安全等一系列优势,PoE供电成为无线覆盖、安防监控、以及智能电网等场景的新宠,UU带大家一起来了解下该技术原理。0x02 POE的原理PoE供电就是通过以太网供电,这种方式仅凭借那根连接通信终端的网线就可完成为它们供电。PoE提供的是-53V~0V的直流电,供电距离最长可达100m。[line]PoE系统的组成[/line]PoE供电系统中有三个角色:PoE电源模块:这个角色负责为角色3提供源源不断的电能;供电设备PSE(Power-sourcing Equipment):这个角色负责“怎么样”去给角色3供电;受电设备PD(Powered Device):这个角色负责享受前两个角色的服务。那些通信终端就属于这种角色。[line]网线线序说明[/line]交换机PoE供电时,1/2链接形成正极,3/6链接形成负极,为PD供电。交换机支持的是Alternative A供电模式。1/2和3/6线对即传输数据,也传输电能。由于DC直流电和数据频率互不干扰,所以可以在同一对线同时传输电流和数据。1...
2020年12月31日
59 阅读
2 评论

最新回复

  1. Lord
    2021-09-12
  2. tian262
    2021-09-09

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  3. tian262
    2021-09-09

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  4. weeds
    2021-09-08
  5. 110
    2021-09-06

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