300-101 OSPF实验题求助

plays2

就是实验题库的第三题：
HH010.com is a small IT corporation that is attempting to implement the
network shown in the exhibit. Currently the implementation is partially
completed. OSPF has been configured on routers Chicago and NewYork. The
SO/O interface on Chicago and the SO/1 interface on NewYork are in Area 0.
The loopbackO interface on NewYork is in Area 1. However, they cannot ping
from the serial interface of the Seattle router to the loopback interface of the
NewYork router. You have been asked to complete the implementation to allow
this ping.
HH010.com's corporate implementation guidelines require:
The OSPF process ID for all routers must be 10.
The routing protocol for each interface must be enabled under the routing
process.
The routing protocol must be enabled for each interface using the most
specific wildcard mask possible.
The serial link between Seattle and Chicago must be in OSPF area 21.
OSPF area 21 must not receive any inter-area or external routes.(except the
default route)
Network Information
Seattle
S0/0 192.168.16.5/30 - Link between Seattle and Chicago
Secret Password: cisco
Chicago
S0/0 192.168.54.9/30 - Link between Chicago and NewYork
S0/1 192.168.16.6/30 - Link between Seattle and Chicago Secre
Password: cisco
NewYork
S0/1 192.168.54.10/30 - Link between Chicago and NewYork
Loopback0 172.16.189.189
Secret Password: cisco


Explanation/Reference:Seattle Configuration:Seattle>enablePassword:ciscoSeattle#conf tSeattle(config)#router ospf 10Seattle(config-router)#network 192.168.16.4 0.0.0.3 area 21One of the tasks states that area 21 should not receive any external orinter-area routes (except the default route).Seattle(config-router)#area 21 stubSeattle(config-router)#endSeattle#copy run startChicago Configuration:Chicago>enablePassword: ciscoChicago#conf tChicago(config)#router ospf 10Chicago(config-router)#network 192.168.16.4 0.0.0.3 area 21Again, area 21 should not receive any external or inter-area routes (except thedefault route).In order to accomplish this, we must stop LSA Type 5 if we don’t want to sendexternal routes. And if we don’t want to send inter-area routes, we have to stopLSA Type 3 and Type 4. Therefore we want to configure area 21 as a totallystubby area.Chicago(config-router)#area 21 stub no-summaryChicago(config-router)#endChicago#copy run start
按照答案配置后发现邻居关系都没法建立，也没有路由通告。看因为是NBMA网络，多敲了neighbour命令也不行。有谁遇到跟我一样的情况吗？麻烦指点下

liuyuhui_gdtyj

在同一个进程ID里宣告端口。否则的话，需要互相重分布才行。

plays2

我似乎明白了，虽然ospf得进程号是本地有效，但是比如在中间的Chiago路由器上如果是把两侧的路由分别在两个进程中宣告，最后Seattle是无法收到NewYork的宣告路由的。也就是说中间的路由器必须在一个进程中宣告所有需要其他路由器知道的端口。

Q9966

确保这些匹配以建立邻居：
ospf接口网络类型
ospf区域
区域21 stub no-summary
邻居之间的任何身份验证

plays2

Q9966 发表于 2017-7-2 15:24
确保这些匹配以建立邻居：
ospf接口网络类型
ospf区域

感谢回复，用GNS3做的实验，题库的文件里路由器的进程号是1，我按照题傻傻的宣告了进程号21，结果没有进程号1的路由进来。