模拟器
链接： 密码：7iir
gns0.8.6的版本好用 思科的这个iso好用: c3660-js2-mz.124-21a.bin C2691-AD.BIN(这个也很ok,但是这两个支持的hash算法较少) ctrl+shit+6 停止命令R1(config)#crypto isakmp policy 10R1(config-isakmp)#hash ? md5 Message Digest 5 sha Secure Hash Standardc7200-adventerprisek9-mz.151-4.M2.bin #做证书实验用这个
R1(config)#crypto isakmp policy 10R1(config-isakmp)#hash ? md5 Message Digest 5 sha Secure Hash Standard sha256 Secure Hash Standard 2 (256 bit) sha384 Secure Hash Standard 2 (384 bit) sha512 Secure Hash Standard 2 (512 bit)
- 思科ios冷知识1: RAM：随机访问存储器，相当于计算机的内存2：ROM：只读存储器，在ROM中驻留了用于启动和维护路由器的一些微代码3：FLASH: 闪存，相当于计算机的硬盘，存储了IOS文件映像4：NVRAM: 主要用于存储启动配置文件( Non-Volatile[挥发的] Random Access Memory)思科路由器不具备存储历史错误记录的能力，只能通过debug进行即时排错。
探讨bgp几个问题
防止环路:
as间 as-path as内 水平分割 full mesh更新源的问题
同步问题 ibgp水平分割
- 基础ip配置
R1conf tint lo0ip add 1.1.1.1 255.255.255.255int f0/0ip add 12.1.1.1 255.255.255.0no shuR2conf tint lo0 ip add 2.2.2.2 255.255.255.255int f0/0ip add 12.1.1.2 255.255.255.0no shuint f0/1ip add 23.1.1.2 255.255.255.0no shuR3conf tint l0ip add 3.3.3.3 255.255.255.255int f0/0ip add 34.1.1.3 255.255.255.0no shuint f0/1ip add 23.1.1.3 255.255.255.0no shuR4conf tint l0ip add 4.4.4.4 255.255.255.255int f0/0ip add 34.1.1.4 255.255.255.0no shu
- bgp建立full mesh
R1#s run | s bgprouter bgp 123 no synchronization bgp router-id 1.1.1.1 bgp log-neighbor-changes network 1.1.1.1 mask 255.255.255.255 neighbor 2.2.2.2 remote-as 123 neighbor 2.2.2.2 update-source Loopback0 neighbor 3.3.3.3 remote-as 123 neighbor 3.3.3.3 update-source Loopback0 no auto-summary R2#s run | s bgprouter bgp 123 bgp router-id 2.2.2.2 bgp log-neighbor-changes neighbor 1.1.1.1 remote-as 123 neighbor 1.1.1.1 update-source Loopback0 neighbor 3.3.3.3 remote-as 123 neighbor 3.3.3.3 update-source Loopback0R3#s run | s bgp router bgp 123 bgp router-id 3.3.3.3 bgp log-neighbor-changes neighbor 1.1.1.1 remote-as 123 neighbor 1.1.1.1 update-source Loopback0 neighbor 1.1.1.1 next-hop-self neighbor 2.2.2.2 remote-as 123 neighbor 2.2.2.2 update-source Loopback0 neighbor 2.2.2.2 next-hop-self neighbor 34.1.1.4 remote-as 4R4#s run | s bgprouter bgp 4 bgp router-id 4.4.4.4 bgp log-neighbor-changes network 4.4.4.4 mask 255.255.255.255 neighbor 34.1.1.3 remote-as 123