雨衣 2007-11-13 09:44
BGP 路由聚合及抑制实验
[img=960,720]http://www.one-tom.com/bbs/uploads/20070302_221034_bgp.gif[/img]
[font=宋体]练习[url=http://www.one-tom.com/bbs/RTE_textarea.asp?mode=edit&POID=13742&ID=1861#常规路由聚合][font=宋体][u][color=#0000ff][size=3]使用常规的路由聚合[/size][/color][/u][/font][/url][font=宋体]、[/font][url=http://www.one-tom.com/bbs/RTE_textarea.asp?mode=edit&POID=13742&ID=1861#路由聚合][font=宋体][u][color=#0000ff][size=3]使用过滤的路由聚合、路由抑制[/size][/color][/u][/font][/url][font=宋体]、[/font][url=http://www.one-tom.com/bbs/RTE_textarea.asp?mode=edit&POID=13742&ID=1861#tiaojian][font=宋体][u][color=#0000ff][size=3]条件路由通告[/size][/color][/u][/font][/url][/font][font=Wingdings][size=3]l[/size]
[/font][size=3][font=宋体]常规的路由聚合[/font][/size]
[table=98%][tr][td=1,1,51%][align=center][b][font=新宋体][size=12pt]ITAA-1[/size][/font][/b][/align]
[/td][td=1,1,47%][align=center][b][font=新宋体][size=12pt]ITAA-2[/size][/font][/b][/align]
[/td][/tr][tr][td=1,3,51%][font=宋体][font=宋体]interface Loopback0[/font][/font]
[font=宋体][font=宋体]
ip address 192.168.13.1 255.255.255.0 secondary[/font][/font]
[font=宋体][font=宋体]
ip address 192.168.14.1 255.255.255.0 secondary[/font][/font]
[font=宋体][font=宋体]
ip address 192.168.15.1 255.255.255.0 secondary[/font][/font]
[font=宋体][font=宋体]
ip address 192.168.12.1 255.255.255.0[/font][/font]
[font=宋体][font=宋体]![/font][/font]
[font=宋体][font=宋体]interface Loopback1[/font][/font]
[font=宋体][font=宋体]
ip address 1.1.1.1 255.255.255.0[/font][/font]
[font=宋体][font=宋体]![/font][/font]
[font=宋体][font=宋体]interface Serial1/0[/font][/font]
[font=宋体][font=宋体]
ip address 12.1.1.1 255.255.255.0[/font][/font]
[font=宋体][font=宋体]
serial restart-delay 0[/font][/font]
[font=宋体][font=宋体]![/font][/font]
[font=宋体][font=宋体]interface Serial2/0[/font][/font]
[font=宋体][font=宋体]
ip address 13.1.1.1 255.255.255.0[/font][/font]
[font=宋体][font=宋体]
serial restart-delay 0[/font][/font]
[font=宋体][font=宋体]!
[/font][/font]
[font=宋体][font=宋体]router bgp 10[/font][/font]
[font=宋体][font=宋体]
no synchronization[/font][/font]
[font=宋体][font=宋体]
bgp router-id 1.1.1.1[/font][/font]
[font=宋体][font=宋体]
bgp log-neighbor-changes[/font][/font]
[font=宋体][font=宋体]
redistribute connected[/font][/font]
[font=宋体][font=宋体]
neighbor 12.1.1.2 remote-as 20[/font][/font]
[font=宋体][font=宋体]
neighbor 12.1.1.2 description ITAA-2[/font][/font]
[font=宋体][font=宋体]
neighbor 13.1.1.3 remote-as 30[/font][/font]
[font=宋体][font=宋体]
neighbor 13.1.1.3 description ITAA-3[/font][/font]
[font=宋体][font=宋体]
no auto-summary[/font][/font]
[font=宋体][font=宋体]![/font][/font]
[/td][td=1,1,47%][font=宋体][font=宋体]interface Loopback0[/font][/font]
[font=宋体][font=宋体]
ip address 2.2.2.2 255.255.255.0[/font][/font]
[font=宋体][font=宋体]![/font][/font]
[font=宋体][font=宋体]interface Serial2/0[/font][/font]
[font=宋体][font=宋体]
ip address 12.1.1.2 255.255.255.0[/font][/font]
[font=宋体][font=宋体]
serial restart-delay 0[/font][/font]
[font=宋体][font=宋体]![/font][/font]
[font=宋体][font=宋体]router bgp 20[/font][/font]
[font=宋体][font=宋体]
no synchronization[/font][/font]
[font=宋体][font=宋体]
bgp router-id 2.2.2.2[/font][/font]
[font=宋体][font=宋体]
bgp log-neighbor-changes[/font][/font]
[font=宋体][font=宋体]
neighbor 12.1.1.1 remote-as 10[/font][/font]
[font=宋体][font=宋体]
no auto-summary[/font][/font]
[/td][/tr][tr][td=1,1,47%][align=center][font=宋体][size=10.5pt]
[/size][/font][b][font=新宋体][size=12pt]ITAA-3[/size][/font][/b][font=宋体][size=10.5pt][/size][/font][/align]
[/td][/tr][tr][td=1,1,47%][font=宋体][font=宋体]interface Loopback0[/font][/font]
[font=宋体][font=宋体]
ip address 3.3.3.3 255.255.255.0[/font][/font]
[font=宋体][font=宋体]![/font][/font]
[font=宋体][font=宋体]interface Serial1/0[/font][/font]
[font=宋体][font=宋体]
ip address 13.1.1.3 255.255.255.0[/font][/font]
[font=宋体][font=宋体]
serial restart-delay 0[/font][/font]
[font=宋体][font=宋体]![/font][/font]
[font=宋体][font=宋体]router bgp 30[/font][/font]
[font=宋体][font=宋体]
no synchronization[/font][/font]
[font=宋体][font=宋体]
bgp router-id 3.3.3.3[/font][/font]
[font=宋体][font=宋体]
bgp log-neighbor-changes[/font][/font]
[font=宋体][font=宋体]
neighbor 13.1.1.1 remote-as 10[/font][/font]
[font=宋体][font=宋体]
no auto-summary[/font][/font]
[/td][/tr][/table][color=red][font=Times New Roman] [/font][/color]
[color=red][font=宋体]使用[/font][/color][color=red][font=Times New Roman] ITAA-1(config) #aggregate-address 192.168.12.0 255.255.252.0[/font][/color]
[font=宋体]没有加关键字[/font][font=Times New Roman]summary-only
ITAA-2[/font][font=宋体]、[/font][font=Times New Roman]ITAA-3[/font][font=宋体]收到的路由情况，除了汇总的还有明细的。[/font]
[font=Times New Roman]ITAA-2#sho ip bgp | be Network[/font]
[font=Times New Roman]
Network
Next Hop
Metric LocPrf Weight Path[/font]
[font=Times New Roman]*> 3.3.3.0/24
12.1.1.1
0
0 10 ?[/font]
[font=Times New Roman]r> 12.1.1.0/24
12.1.1.1
0
0 10 ?
[/font]
[font=Times New Roman]*> 13.1.1.0/24
12.1.1.1
0
0 10 ?[/font]
[font=Times New Roman]*> 192.168.12.0
12.1.1.1
0
0 10 ?[/font]
[color=red][font=Times New Roman]*> 192.168.12.0/22
12.1.1.1
0
0 10 i[/font][/color]
[font=Times New Roman]*> 192.168.13.0
12.1.1.1
0
0 10 ?[/font]
[font=Times New Roman]*> 192.168.14.0
12.1.1.1
0
0 10 ?[/font]
[font=Times New Roman]*> 192.168.15.0
12.1.1.1
0
0 10 ?[/font]
[font=Times New Roman] [/font]
[font=Times New Roman]ITAA-3#sho ip bgp | be Net[/font]
[font=Times New Roman]
Network
Next Hop
Metric LocPrf Weight Path[/font]
[font=Times New Roman]r> 3.3.3.0/24
13.1.1.1
0
0 10 ?[/font]
[font=Times New Roman]*> 12.1.1.0/24
13.1.1.1
0
0 10 ?[/font]
[font=Times New Roman]r> 13.1.1.0/24
13.1.1.1
0
0 10 ?[/font]
[font=Times New Roman]*> 192.168.12.0
13.1.1.1
0
0 10 ?[/font]
[color=red][font=Times New Roman]*> 192.168.12.0/22
13.1.1.1
0
0 10 i[/font][/color]
[font=Times New Roman]*> 192.168.13.0
13.1.1.1
0
0 10 ?[/font]
[font=Times New Roman]*> 192.168.14.0
13.1.1.1
0
0 10 ?[/font]
[font=Times New Roman]*> 192.168.15.0
13.1.1.1
0
0 10 ?[/font]
[font=Times New Roman] [/font]
[font=宋体]加了[/font][font=Times New Roman]summary-only [/font][font=宋体]以后，[/font][font=Times New Roman]ITAA-2[/font][font=宋体]、[/font][font=Times New Roman]ITAA-3[/font][font=宋体]收到的路由情况[/font]
[font=Times New Roman] [/font]
[font=Times New Roman]ITAA-1#sho ip bgp | be Net
[/font][font=宋体]（前面带[/font][font=Times New Roman]s[/font][font=宋体]的路由条目为[/font][font=Times New Roman]suppress[/font][font=宋体]的条目）[/font][font=Times New Roman]
[/font]
[font=Times New Roman]
Network
Next Hop
Metric LocPrf Weight Path[/font]
[font=Times New Roman]*> 3.3.3.0/24
0.0.0.0
0
32768 ?[/font]
[font=Times New Roman]*> 12.1.1.0/24
0.0.0.0
0
32768 ?[/font]
[font=Times New Roman]*> 13.1.1.0/24
0.0.0.0
0
32768 ?[/font]
[font=Times New Roman]s> 192.168.12.0
0.0.0.0
0
32768 ?[/font]
[font=Times New Roman]*> 192.168.12.0/22
0.0.0.0
32768 i[/font]
[font=Times New Roman]s> 192.168.13.0
0.0.0.0
0
32768 ?[/font]
[font=Times New Roman]s> 192.168.14.0
0.0.0.0
0
32768 ?[/font]
[font=Times New Roman]s> 192.168.15.0
0.0.0.0
0
32768 ?[/font]
[font=Times New Roman]ITAA-2#sho ip bgp | be Net[/font]
[font=Times New Roman]
Network
Next Hop
Metric LocPrf Weight Path[/font]
[font=Times New Roman]*> 3.3.3.0/24
12.1.1.1
0
0 10 ?[/font]
[font=Times New Roman]r> 12.1.1.0/24
12.1.1.1
0
0 10 ?[/font]
[font=Times New Roman]*> 13.1.1.0/24
12.1.1.1
0
0 10 ?[/font]
[font=Times New Roman][color=red]*> 192.168.12.0/22
12.1.1.1
0
0 10 i[/color][/font]
[font=Times New Roman]ITAA-3#sho ip bgp | be Net[/font]
[font=Times New Roman]
Network
Next Hop
Metric LocPrf Weight Path[/font]
[font=Times New Roman]r> 3.3.3.0/24
13.1.1.1
0
0 10 ?[/font]
[font=Times New Roman]*> 12.1.1.0/24
13.1.1.1
0
0 10 ?[/font]
[font=Times New Roman]r> 13.1.1.0/24
13.1.1.1
0
0 10 ?[/font]
[color=red][font=Times New Roman]*> 192.168.12.0/22
13.1.1.1
0
0 10 i[/font][/color]
[color=red][font=Wingdings][size=3]l[/size]
[/font][/color][size=3][font=宋体]使用过滤的路由聚合[/font][color=red][/color][/size]
[color=red][font=宋体]练习[/font][/color][color=red][font=Times New Roman]aggregate-address [/font][/color][color=red][font=宋体]与[/font][/color][color=red][font=Times New Roman]suppress map [/font][/color][color=red][font=宋体]、[/font][/color][color=red][font=Times New Roman]unsuppress map [/font][/color][color=red][font=宋体]配合使用来指定哪些路由是应该抑制的、不应该抑制的。[/font][/color][color=red][/color]
[font=宋体][color=red]目的：抑制[/color][color=red][font=宋体]192.168.12.0/24 192.168.13.0/24
192.168.15.0/24[/font][/color][/font]
[b][font=宋体][size=12pt]ITAA-1[/size][/font][/b][b][font=宋体][size=12pt]的配置如下 ITAA-2 、ITAA-3 配置不变[/size][/font][/b][color=black][/color]
[table=98%][tr][td=1,1,99%][align=center][b][font=宋体][size=12pt]ITAA-1 [/size][/font][/b][/align]
[/td][/tr][tr][td=1,1,99%][font=宋体][font=宋体]interface Loopback0[/font][/font]
[font=宋体][font=宋体]
ip address 192.168.13.1 255.255.255.0 secondary[/font][/font]
[font=宋体][font=宋体]
ip address 192.168.14.1 255.255.255.0 secondary[/font][/font]
[font=宋体][font=宋体]
ip address 192.168.15.1 255.255.255.0 secondary[/font][/font]
[font=宋体][font=宋体]
ip address 192.168.12.1 255.255.255.0[/font][/font]
[font=宋体][font=宋体]![/font][/font]
[font=宋体][font=宋体]interface Loopback1[/font][/font]
[font=宋体][font=宋体]
ip address [color=black]1.1.1[/color][color=black].1 [/color]
255.255.255.0[/font][/font]
[font=宋体][font=宋体]![/font][/font]
[font=宋体][font=宋体]interface Serial1/0[/font][/font]
[font=宋体][font=宋体]
ip address 12.1.1.1 255.255.255.0[/font][/font]
[font=宋体][font=宋体]![/font][/font]
[font=宋体][font=宋体]router bgp 10[/font][/font]
[font=宋体][font=宋体]
no synchronization[/font][/font]
[font=宋体][font=宋体]
bgp router-id 1.1.1.1[/font][/font]
[font=宋体][font=宋体]
bgp log-neighbor-changes[/font][/font]
[font=宋体][font=宋体]
[color=red]aggregate-address 192.168.12.0 255.255.252.0 suppress-map hide-me[/color][/font][/font]
[font=宋体][font=宋体]
redistribute connected[/font][/font]
[font=宋体][font=宋体]
neighbor 12.1.1.2 remote-as 20[/font][/font]
[font=宋体][font=宋体]
neighbor 12.1.1.2 description ITAA-2[/font][/font]
[font=宋体][font=宋体]
neighbor 13.1.1.3 remote-as 30[/font][/font]
[font=宋体][font=宋体]
neighbor 13.1.1.3 description ITAA-3[/font][/font]
[font=宋体][font=宋体]
no auto-summary[color=red][/color][/font][/font]
[color=red][font=宋体][font=宋体]ip prefix-list 10 seq 5 permit 192.168.12.0/24[/font][/font][/color]
[color=red][font=宋体][font=宋体]ip prefix-list 10 seq 10 permit 192.168.13.0/24[/font][/font][/color]
[color=red][font=宋体][font=宋体]ip prefix-list 10 seq 15 permit 192.168.15.0/24[/font][/font][/color]
[color=red][font=宋体][font=宋体]!
[/font][/font][/color]
[color=red][font=宋体][font=宋体]route-map hide-me permit 10[/font][/font][/color]
[color=red][font=宋体][font=宋体]
match ip address prefix-list 10[/font][/font][/color]
[/td][/tr][/table][color=black][font=Times New Roman]ITAA-1#sho ip bgp | be Ne
[/font][/color][color=black][font=宋体]（可见[/font][/color][color=black][font=Times New Roman]ITAA-1[/font][/color][color=black][font=宋体]成功抑制住了这三个网段）[/font][/color][color=black][/color]
[color=black][font=Times New Roman]
Network
Next Hop
Metric LocPrf Weight Path[/font][/color]
[color=black][font=Times New Roman]*> 3.3.3.0/24
0.0.0.0
0
32768 ?[/font][/color]
[color=black][font=Times New Roman]*> 12.1.1.0/24
0.0.0.0
0
32768 ?[/font][/color]
[color=black][font=Times New Roman]*> 13.1.1.0/24
0.0.0.0
0
32768 ?[/font][/color]
[color=black][font=Times New Roman]s> 192.168.12.0
0.0.0.0
0
32768 ?[/font][/color]
[color=black][font=Times New Roman]*> 192.168.12.0/22
0.0.0.0
32768 i[/font][/color]
[color=black][font=Times New Roman]s> 192.168.13.0
0.0.0.0
0
32768 ?[/font][/color]
[color=black][font=Times New Roman]*> 192.168.14.0
0.0.0.0
0
32768 ?[/font][/color]
[color=black][font=Times New Roman]s> 192.168.15.0
0.0.0.0
0
32768 ?[/font][/color]
[color=black][font=Times New Roman] [/font][/color]
[color=black][font=Times New Roman] [/font][/color]
[color=red][font=宋体]紧接着上一个实验，我们来做[/font][/color][color=red][font=Times New Roman]unsuppress map[/font][/color][color=red][font=宋体]的实验，对[/font][/color][color=red][font=Times New Roman]ITAA-2[/font][/color][color=red][font=宋体]通告所有网段[/font][/color][color=red][/color]
[table=98%][tr][td=1,1,99%][align=center][b][font=宋体][size=12pt]IIAA-1[/size][/font][/b][/align]
[/td][/tr][tr][td=1,1,99%][font=宋体][/font]
[font=宋体][font=宋体]interface Loopback0[/font][/font]
[font=宋体][font=宋体]
ip address 192.168.13.1 255.255.255.0 secondary[/font][/font]
[font=宋体][font=宋体]
ip address 192.168.14.1 255.255.255.0 secondary[/font][/font]
[font=宋体][font=宋体]
ip address 192.168.15.1 255.255.255.0 secondary[/font][/font]
[font=宋体][font=宋体]
ip address 192.168.12.1 255.255.255.0[/font][/font]
[font=宋体][font=宋体]![/font][/font]
[font=宋体][font=宋体]interface Loopback1[/font][/font]
[font=宋体][font=宋体]
ip address [color=black]1.1.1[/color][color=black].1 [/color]
255.255.255.0[/font][/font]
[font=宋体][font=宋体]![/font][/font]
[font=宋体][font=宋体]interface Serial1/0[/font][/font]
[font=宋体][font=宋体]
ip address 12.1.1.1 255.255.255.0[/font][/font]
[font=宋体][font=宋体]![/font][/font]
[font=宋体][font=宋体]interface Serial2/0[/font][/font]
[font=宋体][font=宋体]
ip address 13.1.1.1 255.255.255.0[/font][/font]
[font=宋体][font=宋体]
serial restart-delay 0[/font][/font]
[font=宋体][font=宋体]![/font][/font]
[font=宋体][font=宋体]router bgp 10[/font][/font]
[font=宋体][font=宋体]
no synchronization[/font][/font]
[font=宋体][font=宋体]
bgp router-id 1.1.1.1[/font][/font]
[font=宋体][font=宋体]
bgp log-neighbor-changes[/font][/font]
[font=宋体][font=宋体]
aggregate-address 192.168.12.0 255.255.252.0 suppress-map hide-me[/font][/font]
[font=宋体][font=宋体]
redistribute connected[/font][/font]
[font=宋体][font=宋体]
neighbor 12.1.1.2 remote-as 20[/font][/font]
[font=宋体][font=宋体]
neighbor 12.1.1.2 description ITAA-2[/font][/font]
[b][color=red][font=宋体][font=宋体]
neighbor 12.1.1.2 unsuppress-map hide-me[/font][/font][/color][/b]
[font=宋体][font=宋体]
neighbor 13.1.1.3 remote-as 30[/font][/font]
[font=宋体][font=宋体]
neighbor 13.1.1.3 description ITAA-3[/font][/font]
[font=宋体][font=宋体]
no auto-summary[/font][/font]
[font=宋体][font=宋体]ip prefix-list 10 seq 5 permit 192.168.12.0/24[/font][/font]
[font=宋体][font=宋体]ip prefix-list 10 seq 10 permit 192.168.13.0/24[/font][/font]
[font=宋体][font=宋体]ip prefix-list 10 seq 15 permit 192.168.15.0/24[/font][/font]
[font=宋体][font=宋体]![/font][/font]
[font=宋体][font=宋体]route-map hide-me permit 10[/font][/font]
[font=宋体][font=宋体]
match ip address prefix-list 10[/font][/font]
[/td][/tr][/table][color=black][font=Times New Roman] [/font][/color]
[color=black][font=宋体]此时你对比[/font][/color][color=black][font=Times New Roman]ITAA-2[/font][/color][color=black][font=宋体]、[/font][/color][color=black][font=Times New Roman]ITAA-3[/font][/color][color=black][font=宋体]收到的路由[/font][/color][font=Times New Roman]
[color=red]ITAA-3[/color][/font][color=red][font=宋体]多了三条[/font][/color][color=black][/color]
[color=red][font=Times New Roman]ITAA-3#sho ip bgp | be Net[/font][/color]
[color=black][font=Times New Roman]
Network
Next Hop
Metric LocPrf Weight Path[/font][/color]
[color=black][font=Times New Roman]r> 3.3.3.0/24
13.1.1.1
0
0 10 ?[/font][/color]
[color=black][font=Times New Roman]*> 12.1.1.0/24
13.1.1.1
0
0 10 ?[/font][/color]
[color=black][font=Times New Roman]r> 13.1.1.0/24
13.1.1.1
0
0 10 ?[/font][/color]
[color=black][font=Times New Roman]*> 192.168.12.0/22
13.1.1.1
0
0 10 i[/font][/color]
[color=black][font=Times New Roman]*> 192.168.14.0
13.1.1.1
0
0 10 ?[/font][/color]
[color=red][font=Times New Roman]ITAA-2#sho ip bgp | be Net[/font][/color]
[color=black][font=Times New Roman]
Network
Next Hop
Metric LocPrf Weight Path[/font][/color]
[color=black][font=Times New Roman]*> 3.3.3.0/24
12.1.1.1
0
0 10 ?[/font][/color]
[color=black][font=Times New Roman]r> 12.1.1.0/24
12.1.1.1
0
0 10 ?[/font][/color]
[color=black][font=Times New Roman]*> 13.1.1.0/24
12.1.1.1
0
0 10 ?[/font][/color]
[color=red][font=Times New Roman]*> 192.168.12.0
12.1.1.1
0
0 10 ?[/font][/color]
[color=black][font=Times New Roman]*> 192.168.12.0/22
12.1.1.1
0
0 10 i[/font][/color]
[color=red][font=Times New Roman]*> 192.168.13.0
12.1.1.1
0
0 10 ?[/font][/color]
[color=black][font=Times New Roman]*> 192.168.14.0
12.1.1.1
0
0 10 ?[/font][/color]
[color=red][font=Times New Roman]*> 192.168.15.0
12.1.1.1
0
0 10 ?[/font][/color]
[color=red][font=Wingdings][size=3]l[/size]
[/font][/color][b][color=red][font=宋体][size=3]条件路由通告[/size][/font][/color][/b][b][color=black][font=宋体]（[/font][/color][/b][color=black][font=宋体]实验拓扑仍然是上面那个）[/font][/color][color=red][/color]
[b][color=red][font=Times New Roman] [/font][/color][/b]
[b][color=red][font=Times New Roman] [/font][/color][/b]
[color=red][font=宋体]条件路由通告提供允许对路由通告进行更多控制的用户定义路由通告方式，条件路由通告方式，条件路由通告可以让你通过[/font][/color][color=red][font=Times New Roman]non-exist-map[/font][/color][color=red][font=宋体]的路由图指定一系列的条件来跟踪某个路由的状态。如果路由不存在，通告另外一个称为[/font][/color][color=red][font=Times New Roman]advertise-map[/font][/color][color=red][font=宋体]的路由图来指定的路由。[/font][/color][color=red][/color]
[color=red][font=宋体]实验目的：如果[/font][/color][color=red][font=Times New Roman]192.168.14.0[/font][/color][color=red][font=宋体]存在不通告[/font][/color][color=red][font=Times New Roman]192.168.13.0[/font][/color][color=red][font=宋体]，如果[/font][/color][color=red][font=Times New Roman]192.168.14.0[/font][/color][color=red][font=宋体]不存在，通告[/font][/color][color=red][font=Times New Roman]192.168.13.0[/font][/color]
[table=98%][tr][td=1,1,99%][align=center][b][font=宋体][size=12pt]ITAA-1 [/size][/font][/b][/align]
[/td][/tr][tr][td=1,1,99%][color=black][font=宋体][font=宋体]![/font][/font][/color]
[color=black][font=宋体][font=宋体]interface Loopback0[/font][/font][/color]
[color=black][font=宋体][font=宋体]
ip address 192.168.13.1 255.255.255.0 secondary[/font][/font][/color]
[color=black][font=宋体][font=宋体]
ip address 192.168.15.1 255.255.255.0 secondary[/font][/font][/color]
[color=black][font=宋体][font=宋体]
ip address 192.168.14.1 255.255.255.0 secondary[/font][/font][/color]
[color=black][font=宋体][font=宋体]
ip address 192.168.12.1 255.255.255.0[/font][/font][/color]
[color=black][font=宋体][font=宋体]![/font][/font][/color]
[color=black][font=宋体][font=宋体]interface Loopback1[/font][/font][/color]
[color=black][font=宋体][font=宋体]
ip address 1.1.1.1 255.255.255.0[/font][/font][/color]
[color=black][font=宋体][font=宋体]![/font][/font][/color]
[color=black][font=宋体][font=宋体]interface Ethernet0/0[/font][/font][/color]
[color=black][font=宋体][font=宋体]
no ip address[/font][/font][/color]
[color=black][font=宋体][font=宋体]
shutdown[/font][/font][/color]
[color=black][font=宋体][font=宋体]![/font][/font][/color]
[color=black][font=宋体][font=宋体]interface Serial1/0[/font][/font][/color]
[color=black][font=宋体][font=宋体]
ip address 12.1.1.1 255.255.255.0[/font][/font][/color]
[color=black][font=宋体][font=宋体]！[/font][/font][/color]
[color=black][font=宋体][font=宋体]interface Serial2/0[/font][/font][/color]
[color=black][font=宋体][font=宋体]
ip address 13.1.1.1 255.255.255.0[/font][/font][/color]
[color=black][font=宋体][font=宋体]
serial restart-delay 0[/font][/font][/color]
[color=black][font=宋体][font=宋体]!
[/font][/font][/color]
[color=black][font=宋体][font=宋体]router bgp 10[/font][/font][/color]
[color=black][font=宋体][font=宋体]
no synchronization[/font][/font][/color]
[color=black][font=宋体][font=宋体]
bgp router-id 1.1.1.1[/font][/font][/color]
[color=black][font=宋体][font=宋体]
bgp log-neighbor-changes[/font][/font][/color]
[color=black][font=宋体][font=宋体]
redistribute connected[/font][/font][/color]
[color=black][font=宋体][font=宋体]
neighbor 12.1.1.2 remote-as 20[/font][/font][/color]
[color=black][font=宋体][font=宋体]
neighbor 12.1.1.2 description ITAA-2[/font][/font][/color]
[color=black][font=宋体][font=宋体]
neighbor 12.1.1.2 unsuppress-map hide-me[/font][/font][/color]
[color=red][font=宋体][font=宋体]
neighbor 12.1.1.2 advertise-map advertise-me non-exist-map not-in-table[/font][/font][/color]
[color=black][font=宋体][font=宋体]
neighbor 13.1.1.3 remote-as 30[/font][/font][/color]
[color=black][font=宋体][font=宋体]
neighbor 13.1.1.3 description ITAA-3[/font][/font][/color]
[color=black][font=宋体][font=宋体]
no auto-summary[/font][/font][/color]
[color=black][font=宋体][font=宋体]![/font][/font][/color]
[color=red][font=宋体][font=宋体]ip prefix-list 1000 seq 5 permit 192.168.13.0/24[/font][/font][/color]
[color=red][font=宋体][font=宋体]![/font][/font][/color]
[color=red][font=宋体][font=宋体]ip prefix-list 1001 seq 5 permit 192.168.14.0/24[/font][/font][/color]
[color=red][font=宋体][font=宋体]!
[/font][/font][/color]
[color=red][font=宋体][font=宋体]route-map not-in-table permit 10[/font][/font][/color]
[color=red][font=宋体][font=宋体]
match ip address prefix-list 1001[/font][/font][/color]
[color=red][font=宋体][font=宋体]![/font][/font][/color]
[color=red][font=宋体][font=宋体]route-map advertise-me permit 10[/font][/font][/color]
[font=宋体][color=red][font=宋体]
match ip address prefix-list 1000[/font][/color][color=black][font=宋体][/font][/color][/font]
[/td][/tr][/table][color=red][font=Times New Roman] [/font][/color]
[color=black][font=Times New Roman]ITAA-1#clear ip bgp * soft [/font][/color]
[color=black][font=Times New Roman] [/font][/color]
[color=black][font=宋体]如果[/font][/color][color=black][font=Times New Roman]192.168.14.0[/font][/color][color=black][font=宋体]存在不通告[/font][/color][color=black][font=Times New Roman]192.168.13.0 [/font][/color]
[color=black][font=Times New Roman]ITAA-2#sho ip bgp | be Net[/font][/color]
[color=black][font=Times New Roman]
Network
Next Hop
Metric LocPrf Weight Path[/font][/color]
[color=black][font=Times New Roman]*> 3.3.3.0/24
12.1.1.1
0
0 10 ?[/font][/color]
[color=black][font=Times New Roman]r> 12.1.1.0/24
12.1.1.1
0
0 10 ?[/font][/color]
[color=black][font=Times New Roman]*> 13.1.1.0/24
12.1.1.1
0
0 10 ?[/font][/color]
[color=black][font=Times New Roman]*> 192.168.12.0
12.1.1.1
0
0 10 ?[/font][/color]
[color=red][font=Times New Roman]*> 192.168.14.0
12.1.1.1
0
0 10 ?[/font][/color]
[color=black][font=Times New Roman]*> 192.168.15.0
12.1.1.1
0
0 10 ?[/font][/color]
[color=black][font=Times New Roman] [/font][/color]
[color=black][font=宋体]测试：去掉[/font][/color][color=black][font=Times New Roman]192.168.14.0[/font][/color][color=black][font=宋体]网段以后再查看发现[/font][/color][color=black][font=Times New Roman]192.168.13.0[/font][/color][color=black][font=宋体]被通告了[/font][/color][color=black][/color]
[color=black][font=Times New Roman]ITAA-2#sho ip bgp | be Net[/font][/color]
[color=black][font=Times New Roman]
Network
Next Hop
Metric LocPrf Weight Path[/font][/color]
[color=black][font=Times New Roman]*> 3.3.3.0/24
12.1.1.1
0
0 10 ?[/font][/color]
[color=black][font=Times New Roman]r> 12.1.1.0/24
12.1.1.1
0
0 10 ?[/font][/color]
[color=black][font=Times New Roman]*> 13.1.1.0/24
12.1.1.1
0
0 10 ?[/font][/color]
[color=black][font=Times New Roman]*> 192.168.12.0
12.1.1.1
0
0 10 ?[/font][/color]
[color=red][font=Times New Roman]*> 192.168.13.0
12.1.1.1
0
0 10 ?[/font][/color]
[color=black][font=Times New Roman]*> 192.168.15.0
12.1.1.1
0
0 10 ?[/font][/color]
