单臂路由+DHCP+DHCP中继+GRE配置教程
①配置单臂路由
②在Branch上开启DHCP，同时PC1、PC2能通过DHCP获取到IP地址，并且互相能访问
③关闭Branch上DHCP并配上DHCP中继，在server上配置DHCP，实现DHCP跨广播域服务
④在Branch和HQ之间开启GRE，实现PC1和PC2的相互访问，以及到server的访问
PC1
PC1(config)#no ip routing
PC1(config)#int e0/1
PC1(config-if)#ip address dhcp
PC1(config-if)#no sh
PC1(config-if)#
*Jan 9 10:42:41.280: %LINK-3-UPDOWN: Interface Ethernet0/1, changed state to up
*Jan 9 10:42:42.286: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/1, changed state to up
PC1(config-if)#
*Jan 9 10:42:53.504: %DHCP-6-ADDRESS_ASSIGN: Interface Ethernet0/1 assigned DHCP address 10.1.10.1, mask 255.255.255.0, hostname PC1
PC1(config-if)#do ping 10.1.20.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.20.1, timeout is 2 seconds:
.!!!!
Success rate is 80 percent (4/5), round-trip min/avg/max = 6/7/9 ms
PC1(config-if)#
PC1>en
PC1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
PC1(config)#int e0/1
PC1(config-if)#no sh
PC1(config-if)#
*Jan 11 05:06:25.069: %LINK-3-UPDOWN: Interface Ethernet0/1, changed state to up
*Jan 11 05:06:26.075: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/1, changed state to up
PC1(config-if)#
*Jan 11 05:07:26.080: %DHCP-6-ADDRESS_ASSIGN: Interface Ethernet0/1 assigned DHCP address 10.1.10.1, mask 255.255.255.0, hostname PC1
PC1(config-if)#do ping 172.16.1.100
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.1.100, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/16/18 ms
PC1(config-if)#do ping 10.1.20.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.20.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/7/12 ms
PC1(config-if)#
PC2
PC2(config)#no ip routing
PC2(config)#int e0/1
PC2(config-if)#ip add dhc
PC2(config-if)#ip add dhcp
PC2(config-if)#no sh
PC2(config-if)#
*Jan 9 10:42:51.872: %LINK-3-UPDOWN: Interface Ethernet0/1, changed state to up
*Jan 9 10:42:52.872: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/1, changed state to up
PC2(config-if)#
*Jan 9 10:43:04.188: %DHCP-6-ADDRESS_ASSIGN: Interface Ethernet0/1 assigned DHCP address 10.1.20.1, mask 255.255.255.0, hostname PC2
PC2(config-if)#do ping 10.1.10.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.10.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/7/14 ms
PC2(config-if)#
PC2>en
PC2#conf t
Enter configuration commands, one per line. End with CNTL/Z.
PC2(config)#int e0/1
PC2(config-if)#no sh
PC2(config-if)#
*Jan 11 05:07:54.369: %LINK-3-UPDOWN: Interface Ethernet0/1, changed state to up
*Jan 11 05:07:55.373: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/1, changed state to up
PC2(config-if)#
*Jan 11 05:07:58.518: %DHCP-6-ADDRESS_ASSIGN: Interface Ethernet0/1 assigned DHCP address 10.1.20.1, mask 255.255.255.0, hostname PC2
PC2(config-if)#end
PC2#ping
*Jan 11 05:08:04.867: %SYS-5-CONFIG_I: Configured from console by console
PC2#ping 10.1.10.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.10.1, timeout is 2 seconds:
.!!!!
Success rate is 80 percent (4/5), round-trip min/avg/max = 5/6/8 ms
PC2#ping 172.16.1.100
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.1.100, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/16/18 ms
PC2#
SW1
SW1(config)#vlan 10,20
SW1(config-vlan)#exit
SW1(config)#int e0/1
SW1(config-if)#switchport mode access
SW1(config-if)#switchport access vlan 10
SW1(config-if)#exi
SW1(config)#int range e0/2 - 3
SW1(config-if-range)#switchport trunk encapsulation dot1q
SW1(config-if-range)#switchport mode trunk
SW1(config-if-range)#exi
SW1(config)#int e0/0
SW1(config-if)#switchport trunk encapsulation dot1q
SW1(config-if)#switchport mode trunk
SW1(config-if)#
SW2
SW2(config)#vlan 10,20
SW2(config-vlan)#exi
SW2(config)#int e0/1
SW2(config-if)#switchport mode access
SW2(config-if)#switchport access vlan 20
SW2(config-if)#exi
SW2(config)#int
SW2(config)#interface range ethernet 0/2 - 3
SW2(config-if-range)#switchport trunk encapsulation dot1q
SW2(config-if-range)#switchport mode trunk
SW2(config-if-range)#
Branch
Branch(config)#int e0/0.1
Branch(config-subif)#encapsulation dot1Q 10
Branch(config-subif)#ip add 10.1.10.254 255.255.255.0
Branch(config-subif)#exit
Branch(config)#int e0/0.2
Branch(config-subif)#encapsulation dot1Q 20
Branch(config-subif)#ip add 10.1.20.254 255.255.255.0
Branch(config-subif)#exit
Branch(config)#ip dhcp pool vlan 10
Branch(dhcp-config)#network 10.1.10.0 255.255.255.0
Branch(dhcp-config)#default-router 10.1.10.254
Branch(dhcp-config)#lease 0 0 3
Branch(dhcp-config)#exit
Branch(config)#ip dhcp pool vlan 20
Branch(dhcp-config)#network 10.1.20.0 255.255.255.0
Branch(dhcp-config)#default-router 10.1.20.254
Branch(dhcp-config)#lease 0 0 3
Branch(dhcp-config)#exit
Branch(config)#int e0/0
Branch(config-if)#no sh
---------------------------------------------------------
Branch#sh run | s dhcp
ip dhcp pool vlan 10
network 10.1.10.0 255.255.255.0
default-router 10.1.10.254
lease 0 0 3
ip dhcp pool vlan 20
network 10.1.20.0 255.255.255.0
default-router 10.1.20.254
lease 0 0 3
Branch#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Branch(config)#no ip dhcp pool vlan 10
Branch(config)#no ip dhcp pool vlan 20
Branch(config)#int e0/1
Branch(config-if)#shut
Branch(config-if)#shutdown
Branch(config-if)#int s4/0
Branch(config-if)#encapsulation ppp
Branch(config-if)#ip add 12.1.1.1 255.255.255.252
Branch(config-if)#no sh
Branch(config-if)#
*Jan 11 04:46:46.292: %LINK-3-UPDOWN: Interface Serial4/0, changed state to up
Branch(config-if)#
*Jan 11 04:46:47.394: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial4/0, changed state to up
Branch(config-if)#
*Jan 11 04:47:10.065: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial4/0, changed state to down
Branch(config-if)#
*Jan 11 04:47:20.070: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial4/0, changed state to up
Branch(config-if)#exit
Branch(config)#interface tunnel 123
Branch(config-if)#
*Jan 11 04:58:23.363: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel123, changed state to down
Branch(config-if)#tunnel mode gre ip
Branch(config-if)#ip add 10.1.1.1 255.255.255.252
Branch(config-if)#no sh
Branch(config-if)#tunnel source 12.1.1.1
Branch(config-if)#tunnel destination 12.1.1.2
Branch(config-if)#
*Jan 11 05:02:27.005: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel123, changed state to up
Branch(config-if)#do sh run int tun123
Building configuration...
Current configuration : 117 bytes
!
interface Tunnel123
ip address 10.1.1.1 255.255.255.252
tunnel source 12.1.1.1
tunnel destination 12.1.1.2
end
Branch(config-if)#exi
Branch(config)#ip route 172.16.1.0 255.255.255.0 tunnel 123
Branch(config)#int e0/0.1
Branch(config-subif)#ip helper-address 172.16.1.100
Branch(config-subif)#int e0/0.2
Branch(config-subif)#ip helper-address 172.16.1.100
Branch(config-subif)#end
Branch#sh ip
*Jan 11 05:08:48.857: %SYS-5-CONFIG_I: Configured from console by console
Branch#sh ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
a - application route
+ - replicated route, % - next hop override
Gateway of last resort is not set
10.0.0.0/8 is variably subnetted, 6 subnets, 3 masks
C 10.1.1.0/30 is directly connected, Tunnel123
L 10.1.1.1/32 is directly connected, Tunnel123
C 10.1.10.0/24 is directly connected, Ethernet0/0.1
L 10.1.10.254/32 is directly connected, Ethernet0/0.1
C 10.1.20.0/24 is directly connected, Ethernet0/0.2
L 10.1.20.254/32 is directly connected, Ethernet0/0.2
12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 12.1.1.0/30 is directly connected, Serial4/0
L 12.1.1.1/32 is directly connected, Serial4/0
172.16.0.0/24 is subnetted, 1 subnets
S 172.16.1.0 is directly connected, Tunnel123
HQ
HQ>en
HQ#conf t
Enter configuration commands, one per line. End with CNTL/Z.
HQ(config)#int e0/1
HQ(config-if)#shutdown
HQ(config-if)#int s4/0
HQ(config-if)#encapsulation ppp
HQ(config-if)#ip add 12.1.1.2 255.255.255.252
HQ(config-if)#no sh
HQ(config-if)#
*Jan 11 04:47:17.349: %LINK-3-UPDOWN: Interface Serial4/0, changed state to up
*Jan 11 04:47:18.358: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial4/0, changed state to up
HQ(config-if)#int e0/0
HQ(config-if)#ip add 172.16.1.1 255.255.255.0
HQ(config-if)#no sh
HQ(config-if)#
*Jan 11 04:48:33.405: %LINK-3-UPDOWN: Interface Ethernet0/0, changed state to up
*Jan 11 04:48:34.410: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/0, changed state to up
HQ(config-if)#
HQ#conf t
Enter configuration commands, one per line. End with CNTL/Z.
HQ(config)#int tunnel 123
*Jan 11 05:04:25.351: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel123, changed state to down
HQ(config-if)#tunnel mode gre ip
HQ(config-if)#ip add 10.1.1.2 255.255.255.252
HQ(config-if)#no sh
HQ(config-if)#tunnel source 12.1.1.2
HQ(config-if)#tunnel destination 12.1.1.1
HQ(config-if)#
*Jan 11 05:05:21.114: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel123, changed state to up
HQ(config-if)#exit
HQ(config)#ip route 10.1.0.0 255.255.0.0 tunnel 123
HQ(config)#do sh ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
a - application route
+ - replicated route, % - next hop override
Gateway of last resort is not set
10.0.0.0/8 is variably subnetted, 3 subnets, 3 masks
S 10.1.0.0/16 is directly connected, Tunnel123
C 10.1.1.0/30 is directly connected, Tunnel123
L 10.1.1.2/32 is directly connected, Tunnel123
12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 12.1.1.0/30 is directly connected, Serial4/0
L 12.1.1.2/32 is directly connected, Serial4/0
172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C 172.16.1.0/24 is directly connected, Ethernet0/0
L 172.16.1.1/32 is directly connected, Ethernet0/0
Server
Router>en
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#hostname Server
Server(config)#int e0/0
Server(config-if)#ip add 172.16.1.100 255.255.255.0
Server(config-if)#no sh
Server(config-if)#
*Jan 11 04:49:01.941: %LINK-3-UPDOWN: Interface Ethernet0/0, changed state to up
*Jan 11 04:49:02.941: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/0, changed state to up
Server(config-if)#exit
Server(config)#ip dhcp pool vlan10
Server(dhcp-config)#network 10.1.10.0 255.255.255.0
Server(dhcp-config)#default-router 10.1.10.254
Server(dhcp-config)#lease 0 12
Server(dhcp-config)#exit
Server(config)#ip dhcp pool vlan20
Server(dhcp-config)#network 10.1.20.0 255.255.255.0
Server(dhcp-config)#default-router 10.1.20.254
Server(dhcp-config)#lease 0 12
Server(dhcp-config)#exit
Server(config)#ip route 0.0.0.0 0.0.0.0 e0/0 172.16.1.1
Server(config)#end
Server#sh ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
a - application route
+ - replicated route, % - next hop override
Gateway of last resort is 172.16.1.1 to network 0.0.0.0
S* 0.0.0.0/0 [1/0] via 172.16.1.1, Ethernet0/0
172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C 172.16.1.0/24 is directly connected, Ethernet0/0
L 172.16.1.100/32 is directly connected, Ethernet0/0
