DHCP trunk link assignment ip interworking between different vlan pc
Lab Topology:
3. Experimental requirements: configure trunk link between switches configure routing function of layer 3 switch configure DHCP trunk link 4 PCs automatically obtain address backup link 4 from DHCP server. Experimental procedure
First change the ip address acquisition mode of PC to dhcp mode.
Configure switch sw1,sw2,sw3,sw4
Establish vlan10,vlan20,vlan30,vlan40
Switch (config) # vlan 10, other same configuration
Configure access Link
Sw1:01 and port 02:
Switch (config-if) # switchport mode access
Switch (config-if) # switchport access vlan 10
Sw2: 01 and 02 ports:
Switch (config-if) # switchport mode access
Switch (config-if) # switchport access vlan 10
Configure trunk Link
Port 03 04 05 of Sw1,sw2 and all ports of sw3,sw4de are configured with trunk links
Sw1:03 04 05 port:
Switch (config-if) # switchport mode trunk
Switch (config-if) # switchport trunk allowed vlan all
Everything else is configured with the same trunk link.
Configure layer 3 switches:
Set up vlan10,20,30,40 and configure SVI with ip address
Switch (config) # vlan 10
Switch (config) # interface vlan 10
Switch (config-if) # no shutdown
Switch (config-if) # ip add 192.168.10.254 255.255.255.0
SVI of other vlan is also configured with ip address
Vlan 20 SVI ip:192.168.20.254 255.255.255.0
Vlan 30 SVI ip:192.168.30.254 255.255.255.0
Vlan 40 SVI ip:192.168.40.254 255.255.255.0
Configure forwarding commands in each vlan:
Switch (config) # interface vlan 10
Switch (config-if) # ip helper-address 192.168.60.1 (points to the DHCP server ip address)
The same configuration commands for SVI in other vlan
Go to port 0ax 3 to configure the ip address:
Switch (config) # interface fastethernet 0amp 3
Switch (config-if) # no shutdown
Switch (config-if) # no switchport (shut down the switch port)
Switch (config-if) # ip address 192.168.50.1 255.255.255.0
Configure the next hop:
Switch (config) # ip route 192.168.60.0 255.255.255.0 192.168.50.2
At this time, because the ip address of the routing interface has not been configured, it does not appear in the routing table of the layer 3 switch (the destination address is reachable, so it will be displayed in the routing table).
Configure the router:
Gi 0ax 0 port: Router (config) # interface gigabitethernet 0Universe 0
Router (config-if) # no shutdown
Router (config-if) # ip address 192.168.50.2 255.255.255.0 (to be the same as the next hop destination ip that was previously configured with layer 3 switch routing)
Gi 0ax 1 port: Router (config) # interface gigabitethernet 0max 1
Router (config-if) # no shutdown
Router (config-if) # ip address 192.168.60.254 255.255.255.0 (this is the gateway of the DHCP server)
The network segment of the PC is not directly connected, so configure the next hop of the router:
There is only one path to other network segments, so static routes can be configured, or one by one to the next hop of the PC network segment
Router (config) # ip route 0.0.0.0 0.0.0.0 192.168.50.1 (destination port is fa0/3 of layer 3 switch)
Configure the DHCP server:
Configure ip address and gateway as shown in the figure: *
Configure the ip address pool as shown in the figure:
Remember to turn on DHCP
Verify: turn on the PC and see if you have obtained the ip address
Experimental questions and summary:
* 1. There are many Vlan and corresponding ports, which should be corresponded one by one.
All Trunk links should be configured correctly, layer 2 switches do not need to choose mode, and layer 3 switches should choose mode.
On the Switchport trunk encapsulation dot1q switch sw3,sw4, the vlan needs to establish four layer 3 switches. The next two ports of the layer 3 switch do not need to be set up. The port connected to the route of the layer 3 switch of the trunk switch should be configured with an ip address, and the vlan of the next hop layer 3 switch should be configured with the forwarding command, that is, the trunk link configuration. *
If you have any suggestions, I hope you can put forward them and discuss them together.
