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)