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网络技术是从1990年代中期发展起来的新技术，它把互联网上分散的资源融为有机整体，实现资源的全面共享和有机协作，使人们能够透明地使用资源的整体能力并按需获取信息。资源包括高性能计算机、存储资源、数据资源、信息资源、知识资源、专家资源、大型数据库、网络、传感器等。 当前的互联网只限于信息共享，网络则被认为是互联网发展的第三阶段。 VAN10,VLAN20,VLAN30
要求 VLAN20,30都能访问VLAN10,但20,30之间不能相互访问.
1.用策略路由控制,让去往VLAN10的被路由到正确接口,其他的都被送到丢弃口
access-list 100 permit ip any 192.168.10.0 0.0.0.255
route-map tovlan1 permit 10
match address 100
set default interface f 0/0.10
route-map tovlan1 permit 20
set default interface null0
interface f0/0.20
ip policy route-map tovlan1
interface f0/0.30
ip policy route-map tovlan1
上面配置由于存在显式路由(直连的) 用缺省借口的方法不行
(PBR中:
set ip next-hop 不检查是否存在显式路由,只检查下一跳是否可达
set interface 检查是否存在显式路由,必须存在才能正常
set ip default next-hp 检查是否存在显式路由,必须不存在才正常
set default interface 检查是否存在显式路由,必须不存在才正常
)
*Mar 1 02:25:10.443: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.10.1, len 100, FIB policy match
*Mar 1 02:25:10.443: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.10.1, len 100, FIB policy rejected(explicit route) - normal forwarding
*Mar 1 02:25:10.459: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.10.1, len 100, FIB policy match
*Mar 1 02:25:10.459: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.10.1
R1#, len 100, FIB policy rejected(explicit route) - normal forwarding
*Mar 1 02:25:10.475: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.10.1, len 100, FIB policy match
*Mar 1 02:25:10.475: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.10.1, len 100, FIB policy rejected(explicit route) - normal forwarding
*Mar 1 02:25:10.551: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.10.1, len 100, FIB policy match
*Mar 1 02:25:10.551: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.10.1, len 100, FIB policy rejected(explicit route) - normal forwarding
改成:
route-map govlan1 permit 10
match address 100
set interface f 0/0.10
route-map govlan1 permit 20
set interface null0
后正常
*Mar 1 02:35:31.059: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.10.1, len 100, FIB policy match
*Mar 1 02:35:31.063: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.10.1 (FastEthernet0/0.10), len 100, FIB policy routed
*Mar 1 02:35:31.111: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.10.1, len 100, FIB policy match
*Mar 1 02:35:31.111: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.10.1 (FastEthernet0/0.10), len 100, FIB policy routed
*Mar 1 02:35:31.139: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.10.1, len 100, FIB policy match
*Mar 1 02:35:31.139: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.10.1 (FastEthernet0/0.10)
R1#, len 100, FIB policy routed
*Mar 1 02:35:31.159: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.10.1, len 100, FIB policy match
*Mar 1 02:35:31.159: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.10.1 (FastEthernet0/0.10), len 100, FIB policy routed
*Mar 1 02:35:31.187: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.10.1, len 100, FIB policy match
*Mar 1 02:35:31.187: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.10.1 (FastEthernet0/0.10), len 100, FIB policy routed
R1#
*Mar 1 02:35:35.135: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.30.1, len 100, FIB policy match
*Mar 1 02:35:35.139: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.30.1 (Null0), len 100, FIB policy routed(drop)
R1#
*Mar 1 02:35:37.171: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.30.1, len 100, FIB policy match
*Mar 1 02:35:37.175: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.30.1 (Null0), len 100, FIB policy routed(drop)
R1#
*Mar 1 02:35:39.183: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.30.1, len 100, FIB policy match
*Mar 1 02:35:39.187: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.30.1 (Null0), len 100, FIB policy routed(drop)
R1#
*Mar 1 02:35:41.179: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.30.1, len 100, FIB policy match
*Mar 1 02:35:41.183: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.30.1 (Null0), len 100, FIB policy routed(drop)
R1#
*Mar 1 02:35:43.187: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.30.1, len 100, FIB policy match
*Mar 1 02:35:43.191: IP: s=192.168.20.1 (FastEthernet0/0.20), d=192.168.30.1 (Null0), len 100, FIB policy routed(drop)
2.用访问列表控制:
R1#sh run
Building configuration...
Current configuration : 1245 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
memory-size iomem 5
!
!
ip cef
!
!
!
!
网络的神奇作用吸引着越来越多的用户加入其中，正因如此，网络的承受能力也面临着越来越严峻的考验―从硬件上、软件上、所用标准上......，各项技术都需要适时应势，对应发展，这正是网络迅速走向进步的催化剂。
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