《案例精解企业级网络构建》赠书活动开始啦！　最新活动：“Web安全大家谈”有奖征文

Policy-based Routing(PBR)综合实验

2007-03-22 13:05:21

拓扑说明
R1，R2通过局域网交换机连接，R2，R3通过FRAME-RELAY交换机连接。R1,R2,R3上启用OSPF协议，其中R1的所有接口和R2的F0/0,F1/0,L0属于AREA 1
R2的S2/0和R3的S2/0属于AREA 0，R3的L0 ,L1属于AREA 3
实验描述
在R2上配置PBR，是从R3的L0端口过来的包大小在0～200BYTES的ICMP包的IP PRECEDENCE被设置为2，next hop为10.0.0.1。从R3的L1过来的UDP包的IP PRECEDENCE被设置为4，netx hop为10.0.1.1

R1
conf t
int l 0
ip ad 1.1.1.1 255.255.255.0
int f 0/0
ip ad 10.0.0.1 255.255.255.0
no shut
int f 1/0
ip ad 10.0.1.1 255.255.255.0
no shut
router ospf 1
router-id 1.1.1.1
net 1.1.1.1 0.0.0.0 a 1
net 10.0.0.1 0.0.0.0 a 1
net 10.0.1.1 0.0.0.0 a 1
end

R2
conf t
int l 0
ip ad 2.2.2.2 255.255.255.0
int f 0/0
ip ad 10.0.0.2 255.255.255.0
no shut
int f 1/0
ip ad 10.0.1.2 255.255.255.0
no shut
int s2/0
ip ad 10.0.2.2 255.255.255.0
encap f
no arp f
no frame inver
frame map ip 10.0.2.3 203 b
no shut
exit
router ospf 1
router-id 2.2.2.2
nei 10.0.2.3
net 2.2.2.2 0.0.0.0 a 1
net 10.0.0.2 0.0.0.0 a 1
net 10.0.1.2 0.0.0.0 a 1
net 10.0.2.2 0.0.0.0 a 0
exit
access-list 100 permit icmp 3.3.3.0 0.0.0.255 1.1.1.0 0.0.0.255
access-list 101 permit udp 3.3.30.0 0.0.0.255 1.1.1.0 0.0.0.255
route-map PBR permit 10
match ip address 100
match length 0 200
set ip percedence 2
set ip next-hop 10.0.0.1
exit
route-map PBR permit 20
match ip address 101
set ip precedence 4
set ip next-hop 10.0.1.1
exit
int s2/0
ip policy route-map PBR
end

R3
conf t
int l 0
ip ad 3.3.3.3 255.255.255.0
int l 1
ip ad 3.3.30.3 255.255.255.0
int s2/0
ip ad 10.0.2.3 255.255.255.0
encap f
no arp f
no frame inver
frame map ip 10.0.2.2 302 b
no shut
exit
router ospf 1
nei 10.0.2.2
net 10.0.2.3 0.0.0.0 a 0
net 3.3.3.3 0.0.0.0 a 3
net 3.3.30.3 0.0.0.0 a 3
end

校验
在R2启用debug ip policy
在R3上做扩展的PING和traceroute
当发送的包为100BYTES时：

R3#ping
Protocol [ip]:
Target IP address: 1.1.1.1
Repeat count [5]: 10
Datagram size [100]: 默认为100BYTES
Timeout in seconds [2]:
Extended commands [n]: y
Source address or interface: 3.3.3.3
Type of service [0]:
Set DF bit in IP header? [no]:
Validate reply data? [no]:
Data pattern [0xABCD]:
Loose, Strict, Record, Timestamp, Verbose[none]:
Sweep range of sizes [n]:
Type escape sequence to abort.
Sending 10, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
Packet sent with a source address of 3.3.3.3
!!!!!!!!!!
Success rate is 100 percent (10/10), round-trip min/avg/max = 12/41/116 ms

R2#debug ip policy
*Mar 22 12:39:58.047: IP: s=3.3.3.3 (Serial2/0), d=1.1.1.1, len 100, FIB policy match
*Mar 22 12:39:58.047: IP: s=3.3.3.3 (Serial2/0), d=1.1.1.1, g=10.0.0.1, len 100, FIB policy routed

当发送包为300BYTES时

R3#ping
Protocol [ip]:
Target IP address: 1.1.1.1
Repeat count [5]: 10
Datagram size [100]: 300
Timeout in seconds [2]:
Extended commands [n]: y
Source address or interface: 3.3.3.3
Type of service [0]:
Set DF bit in IP header? [no]:
Validate reply data? [no]:
Data pattern [0xABCD]:
Loose, Strict, Record, Timestamp, Verbose[none]:
Sweep range of sizes [n]:
Type escape sequence to abort.
Sending 10, 300-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
Packet sent with a source address of 3.3.3.3
!!!!!!!!!!
Success rate is 100 percent (10/10), round-trip min/avg/max = 16/56/140 ms

R2#
*Mar 22 12:41:07.775: IP: s=3.3.3.3 (Serial2/0), d=1.1.1.1, len 300, FIB policy rejected(no match) - normal forwarding

R3#traceroute
Protocol [ip]:
Target IP address: 1.1.1.1
Source address: 3.3.30.3
Numeric display [n]:
Timeout in seconds [3]:
Probe count [3]:
Minimum Time to Live [1]:
Maximum Time to Live [30]:
Port Number [33434]:
Loose, Strict, Record, Timestamp, Verbose[none]:
Type escape sequence to abort.
Tracing the route to 1.1.1.1

1 10.0.2.2 88 msec 104 msec 24 msec
2 10.0.1.1 68 msec * 84 msec

R2#
*Mar 22 12:42:20.795: IP: s=3.3.30.3 (Serial2/0), d=1.1.1.1, len 28, FIB policy match
*Mar 22 12:42:20.795: IP: s=3.3.30.3 (Serial2/0), d=1.1.1.1, g=10.0.1.1, len 28, FIB policy routed

R2#sh ip access-list
Extended IP access list 100
10 permit icmp 3.3.3.0 0.0.0.255 1.1.1.0 0.0.0.255 (40 matches)
Extended IP access list 101
10 permit udp 3.3.30.0 0.0.0.255 1.1.1.0 0.0.0.255 (6 matches)

本文出自 “穿过地狱去看海” 博客，谢绝转载！

上一篇 OSPF的验证方法　　下一篇 QoS Policy Propagation via BGP(QPPB)的应用

类别：CCIE ┆ 技术圈() ┆ 阅读() ┆ 评论() ┆推送到技术圈 ┆返回首页

相关文章

文章评论

[匿名]51CTO游客

2007-03-23 17:57:44

原来路由和交换有这么多东西学啊.

昵称：
验证码：		点击图片可刷新验证码　　博客过2级，无需填写验证码
内容：