L2L VPN实现 hub-spoken 互联方式 作者：Cedric CCIE#25467 网络拓扑结构如上 今天我们讲述如何实现HUB-SPOKEN结构的L2L访问 R1为HUB端 R2，R3为SPOKEN端。 R1#sh run Building configuration... &
The recently announced changes to the CCIE R/S written and lab exams took effect this week. I recently had the chance to take the R/S lab again, as part of the Beta testing - so I decided to save up
To set a limit on the maximum number of Protocol Independent Multicast sparse mode (PIM-SM) register messages sent per second for each (S, G) routing entry, use the ip pim register-rate-limit comm
Hi! Split horizon is used on distance vector algorithms (rip, eigrp), to prevent a route from being advertised back out an interface in which it was received. OSPF is not a distance vector
The Gateway Load Balancing Protocol (GLBP) is a Cisco-proprietary protocol designed to overcome the limitations of existing redundant router protocols. Some of the concepts are the same as with HSR
IP hosts can use several methods of deciding which default router or default gateway to use—DHCP, BOOTP, ICMP Router Discovery Protocol (IRDP), manual configuration, or even by running a routing pr
Congestion-avoidance mechanisms, such as Weighted Random Early Detection (WRED), are complementary to (and dependent on) queuing algorithms. Queuing/scheduling algorithms manage the front of a queu
Ospf 不同进程下建邻居问题分析 众所周知，OSPF进程号仅在本地有效，即不同OSPF进程号只要公告了同一网段，就能建邻居，交换路由更新。我们要分析一下同一路由器下如果同时有2个不同的OSPF进程，是否都能与对方建邻居。 预配： R1上有loopback口10 地址：10.1.1.0/24。E0口地址为1.1.1.1/24 R2上有2个lo
TEN TIPS FOR TAKING THE LAB EXAM Read the entire exam first and check for addressing issues. Do not skip any details or sections.Manage your time. Make a plan to cover all the sections in t
ip subnet-zero To enable the use of subnet zero for interface addresses and routing updates, use the ip subnet-zero global configuration command. To restore the default, use the no form of thi
ip helper-address To have the Cisco IOS software forward User Datagram Protocol (UDP) broadcasts, including BOOTP, received on an interface, use the ip helper-address interface configuration
ip forward-protocol To specify which protocols and ports the router forwards when forwarding broadcast packets, use the ip forward-protocol global configuration command. To remove a protocol
ip unnumbered To enable IP processing on a serial interface without assigning an explicit IP address to the interface, use the ip unnumbered interface configuration command. To disable the IP
IP SLAs—Analyzing IP Service Levels Using the TCP Connect Operation First Published: May 2, 2005 Last Updated: August 29, 2006 This module describes how to use the Cisco IOS IP Serv
ip multicast helper-map To allow IP multicast routing in a multicast-capable internetwork between two broadcast-only internetworks, use the ip multicast helper-map command in interface configurat
ACL控制icmp数据包问题分析（ACL挂法IN,OUT分析） 需求：A、B、C直连 A,C分别写默认路由指出口 需要在B上E0口IN方向写ACL101，使得A能PING通C，C不能PING通A 初始步骤：如图搭拓扑，A上写默认路由指E0口，C上写默认路由指E1口 现分析ACL的写法： 写法一： Access-l
初始步骤： 1.路由器A、B通过以太网线连到交换机 分别划到相应的VLAN 三层交换机开启路由功能 2.A,B三层SW上分别起LOOPBACK口 1.1.1.1、2.2.2.2、3.3.3.3 3.交换机起SVI接口 4.3台设备分别公告直连网段进RIP （版本2，关闭自动汇总） Router B上看路由表：
STP的一些名词、参数以及选举过程分析 STP（802.1d） BID（bridge ID）=priority(2byte)+MACaddress(6byte)，范围0~65535 Cisco默认32768 Bpdu（bridge protocol data unit
需求： 1. R1模拟PC机（关闭ip routing） 2. 拓扑中仅使用2次静态路由
命令：area transit-area-id virtual-link router-idarea transit-area-id virtual-link router-id transmit-delay 1-8192area transit-area-id virtual-link router-id retransmit-interval 1-8192area transit-area-i
全互联的3台交换机，先做好TRUNK ，DOT1Q封装 。在这里就命名3台交换机为SW1,SW2,SW3。sw1上先建数个VLAN (vlan 10;vlan 20;vlan 30)然后将3台交换机上的domain name都改为cisco，这时候3台都是server。此时3台sw上都有了之前sw1上的vlan信息了，依次将3台sw都改为client模式一定要注意先后顺序然后分别检查3台上的vla
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