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1、前綴列表prefix-list解析
2.2.2.0/24
2.2.2.0/25
2.2.2.0/26
ACL只可以控制網(wǎng)絡(luò)號(hào),無(wú)法控制掩碼
access-list 1 permit 2.2.2.0 0.0.0.255
這條ACL并不能精確匹配到2.2.2.0/24,2.2.2.0/25和2.2.2.0/26同樣也被包含在內(nèi),因?yàn)樗麄兊木W(wǎng)絡(luò)號(hào)一致。
Prefix-List既可以控制網(wǎng)絡(luò)號(hào),也可以控制掩碼
2.2.2.0/26
ip prefix-list 1 permit 2.2.2.0/24(網(wǎng)絡(luò)號(hào):2.2.2.0 掩碼:24位)
ip prefix-list 1 permit 2.2.2.0/24 le 32(網(wǎng)絡(luò)號(hào):2.2.2.0 掩碼:24-32位)
ip prefix-list 1 permit 2.2.2.0/24 ge 26(網(wǎng)絡(luò)號(hào):2.2.2.0 掩碼:26-32位)
ip prefix-list 1 permit 2.2.2.0/24 ge 26 le 30(網(wǎng)絡(luò)號(hào):2.2.2.0 掩碼:24-30位)
ip prefix-list 1 permit 0.0.0.0/0 le 32(permit any)
prefix-list從上往下執(zhí)行,默認(rèn)deny any
ACL可以抓數(shù)據(jù)包和路由,可以應(yīng)用于接口和路由進(jìn)程下,Prefix-List只能抓路由只能用于路由進(jìn)程下
2、實(shí)驗(yàn)拓?fù)?/p>
3、實(shí)驗(yàn)配置
R1配置
interface Serial0/0
ip address 12.1.1.1 255.255.255.0
interface Serial0/1
ip address 13.1.1.1 255.255.255.0
interface Serial0/2
ip address 14.1.1.1 255.255.255.0
router eigrp 90
redistribute ospf 110 metric 1500 100 255 1 1500
network 14.1.1.0 0.0.0.255
no auto-summary
router ospf 110
router-id 1.1.1.1
log-adjacency-changes
redistribute rip subnets
network 13.1.1.0 0.0.0.255 area 0
router rip
version 2
network 12.0.0.0
no auto-summary
R2配置
interface Loopback0
ip address 2.2.2.2 255.255.255.0
interface Serial0/0
ip address 12.1.1.2 255.255.255.0
router rip
version 2
network 2.0.0.0
network 12.0.0.0
no auto-summary
R3配置
interface Loopback0
ip address 3.3.3.3 255.255.255.0
interface Serial0/0
ip address 13.1.1.3 255.255.255.0
router ospf 110
router-id 3.3.3.3
log-adjacency-changes
network 3.3.3.0 0.0.0.255 area 0
network 13.1.1.0 0.0.0.255 area 0
R4配置
interface Loopback0
ip address 4.4.4.4 255.255.255.0
interface Serial0/0
ip address 14.1.1.4 255.255.255.0
router eigrp 90
network 4.4.4.0 0.0.0.255
network 14.1.1.0 0.0.0.255
no auto-summary
4、前綴列表應(yīng)用
此時(shí)我們可以看到R4可以學(xué)到3.3.3.3/32和13.1.1.0/24這兩條路由,這里我們希望通過(guò)分發(fā)列表讓R4只學(xué)到3.3.3.3/32這條路由。
R1配置
ip prefix-list 1 permit 3.3.3.3/32
router eigrp 90
distribute-list prefix 1 out ospf 110
此時(shí)R4只學(xué)到3.3.3.3/32這條路由。
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