1、实验拓扑图
2、实验目标
ospf进程引入外部路由时，同时在ospf网络中所有路由器全部配置database overflow【数据库超限】，且设置相同的上限值，另外部路由器的数量只要达到上限值，便将路由器置于OVERFLOW状态，以避免数据库超限。
3、核心配置
<r1>display current-configuration
[V200R003C00]
#
sysname r1
#
snmp-agent local-engineid 800007DB03000000000000
snmp-agent
#
clock timezone China-Standard-Time minus 08:00:00
#
portal local-server load portalpage.zip
#
drop illegal-mac alarm
#
set cpu-usage threshold 80 restore 75
#
aaa
authentication-scheme default
authorization-scheme default
accounting-scheme default
domain default
domain default_admin
local-user admin password cipher %$%$K8m.Nt84DZ}e#<0`8bmE3Uw}%$%$
local-user admin service-type http
#
isis 200
is-level level-2
cost-style wide
network-entity 49.0001.0010.0100.1001.00
#
firewall zone Local
priority 15
#
interface GigabitEthernet0/0/0
ip address 10.1.1.2 255.255.255.0
isis enable 200
#
interface GigabitEthernet0/0/1
ip address 20.1.1.1 255.255.255.0
#
interface GigabitEthernet0/0/2
#
interface NULL0
#
interface LoopBack0
ip address 1.1.1.1 255.255.255.255
#
ospf 100 router-id 1.1.1.1
import-route isis 200 type 1
lsdb-overflow-limit 6
area 0.0.0.0
network 20.1.1.0 0.0.0.255
#
user-interface con 0
authentication-mode password
idle-timeout 0 0
user-interface vty 0 4
user-interface vty 16 20
#
wlan ac
#
return
<r1>
4、实验结果
