网络描述：客户是个大型钢厂，有多个分支厂区，采用OSPF多区域配置；网关都在分支的汇聚交换机上，但是DHCP地址池都统一在核心交换机上配置。
拓扑如下：
关键设备配置：
R１
acl number 2000
rule 5 permit
interface GigabitEthernet0/0/0
ip address 10.1.200.1 255.255.255.252
#
interface GigabitEthernet0/0/1
ip address 221.1.1.2 255.255.255.0
nat outbound 2000
＃interface LoopBack0
ip address 10.1.0.1 255.255.255.255
#
ospf 1 router-id 10.1.0.1
default-route-advertise
area 0.0.0.0
network 10.1.0.1 0.0.0.0
network 10.1.200.1 0.0.0.0
#
ip route-static 0.0.0.0 0.0.0.0 221.1.1.1
R２
acl number 2000
rule 5 permit
nat address-group 1 111.1.1.3 111.1.1.10
#
interface GigabitEthernet0/0/1
ip address 111.1.1.2 255.255.255.0
nat outbound 2000 address-group 1
＃
ip address 10.1.0.2 255.255.255.255
#
ospf 1 router-id 10.1.0.2
default-route-advertise
area 0.0.0.0
network 10.1.0.2 0.0.0.0
network 10.1.200.5 0.0.0.0
#
ip route-static 0.0.0.0 0.0.0.0 111.1.1.1
核心CORE
DHCP ｅｎａｂｌｅ ／／开启ｄｈｃｐ
vlan batch 200 to 203
ip pool fenchang1
gateway-list 10.1.10.254
network 10.1.10.0 mask 255.255.255.0
excluded-ip-address 10.1.10.201 10.1.10.253
dns-list 202.99.192.66
#
ip pool fenchang2
gateway-list 10.1.20.254
network 10.1.20.0 mask 255.255.255.0
excluded-ip-address 10.1.20.201 10.1.20.253
dns-list 114.114.114.114
＃
interface Vlanif200
ip address 10.1.200.2 255.255.255.252
#
interface Vlanif201
ip address 10.1.200.6 255.255.255.252
#
interface Vlanif202
ip address 10.1.200.9 255.255.255.252
dhcp select global
#
interface Vlanif203
ip address 10.1.200.13 255.255.255.252
dhcp select global
#
interface GigabitEthernet0/0/1
port link-type access
port default vlan 200
#
interface GigabitEthernet0/0/2
port link-type access
port default vlan 201
#
interface GigabitEthernet0/0/3
port link-type trunk
port trunk allow-pass vlan 202
#
interface GigabitEthernet0/0/4
port link-type trunk
port trunk allow-pass vlan 203
＃ospf 1
area 0.0.0.0
network 10.1.200.2 0.0.0.0
network 10.1.200.6 0.0.0.0
area 0.0.0.1
network 10.1.200.9 0.0.0.0
area 0.0.0.2
network 10.1.200.13 0.0.0.0
分厂１的汇聚SW
ｄｈｃｐ ｅｎａｂｌｅ ／／开启DHCP
vlan batch 10 202
interface Vlanif10
ip address 10.1.10.254 255.255.255.0
dhcp select relay
dhcp relay server-ip 10.1.200.9
#
interface Vlanif202
ip address 10.1.200.10 255.255.255.252
interface GigabitEthernet0/0/1
port link-type trunk
port trunk allow-pass vlan 202
#
interface GigabitEthernet0/0/2 ／／用的ｈｙｂｒｉｄ口
port hybrid pvid vlan 10
port hybrid untagged vlan 10
＃
ospf 1 router-id 10.1.0.4
area 0.0.0.1
network 10.1.10.0 0.0.0.255
network 10.1.0.4 0.0.0.0
network 10.1.200.10 0.0.0.0
分厂２的汇聚SW
vlan batch 20 203
ｄｈｃｐ ｅｎａｂｌｅ ／／开启DHCP
#
interface Vlanif20
ip address 10.1.20.254 255.255.255.0
dhcp select relay
dhcp relay server-ip 10.1.200.13
#
interface Vlanif203
ip address 10.1.200.14 255.255.255.252
＃interface GigabitEthernet0/0/1
port link-type trunk
port trunk allow-pass vlan 203
#
interface GigabitEthernet0/0/2
port link-type access
port default vlan 20
＃
interface LoopBack0
ip address 10.1.0.5 255.255.255.255
#
ospf 1 router-id 10.1.0.5
area 0.0.0.2
network 10.1.0.5 0.0.0.0
network 10.1.20.0 0.0.0.255
network 10.1.200.14 0.0.0.0