How to configure a vswitch to implement layer-3 Switching

How to configure a switch to implement layer-3 switching first, let's take a look at how the switch sets the application environment of layer-3 switching technology. In order to enable communication between VLANs, single-arm routing is prone to bottlenecks. layer-3 switching can be used to achieve line rate forwarding. 1. What is layer-3 Exchange Technology? www.2cto.com simply says layer-3 exchange technology is layer-2 exchange technology + layer-3 forwarding technology. (The switch works on the second layer and the router works on the third layer.) The following figure shows the topology of the Three-layer switch.

3. configure a layer-3 Switch: 1. configure a route entry on the layer-3 Switch. (to configure a route entry on the layer-3 switch, you must first enable the routing function on the layer-3 switch, otherwise, the layer-3 Switch does not have the routing function. Switch (config) # ip routing 2 configures the vlan ip address, which is the same as the command for configuring the VLAN ip address on the layer-2, because layer-3 switches support routing between VLANs, IP addresses can be configured for each VLAN of the layer-3 switch. Switch (config) # interface vlan-id Switch (config) # ip addrees ip-address subnet-mask
3. The layer-3 switch interface configured on a layer-3 Switch belongs to VLAN 1 by default. If you need to connect a layer-3 switch to a vro, you need to configure a route interface on a vswitch interface. Swith (config) # interface www.2cto.com Switch (config) # no switchport Switch (config) # ip addrees ip-address subnet-mask Switch (config) # no shutdown 4 configure static or dynamic routing on a layer-3 Switch: The method for configuring Static Routing on a layer-3 switch is the same as that configured on a router. Dynamic: Router (config) # router rip Router (config-router) # network-number (declaring the directly connected CIDR Block) static: Router (config) # ip route (network destination network address) [mask subnet mask] {next hop router interface address through which addrees reaches the destination network} (simply put, where to go .. Add non-direct connection CIDR blocks .)
5. view the FIB table: Switch (config) show ip cef (CEF mainly contains two forwarding information tables) forwarding information database (fib): joining table: 6 view the joining table: switch (config) # show adfacency detail 7 experiment topology experiment requirements: the host in VLAN 1 can communicate with the host in VLAN 2 VLAN 3, 2 VLAN 3 cannot access 10.1.1.2 3 and cannot use single-arm routing. Only layer-3 switching is required. The experimental configuration is as follows: 1 in the sw-3l # vlan database sw-3l (vlan) # vlan 2 sw-3l (vlan) # vlan 3 sw-3l (vlan) # exit sw-3l (config) # ip routing sw-3l (config) # interface vlan 1 sw-3l (config-vlan) # ip address 192.168.1.1 255.255.255.0 sw-3l (config-vlan # no shutdown sw-3l (config) # interface vlan 2 sw-3l (config-vlan) # ip address 192.168.2.1 255.255.255.0 sw-3l (config-vlan # no shutdown www.2cto.com sw-3l (config) # interface vlan 3 sw-3l (config-vlan) # ip address 192.168.3.1 255.255.255.0 sw-3l (config-vlan # no shutdown sw-3l (config-if) # exit sw-3l (config) # interface f0/23 sw-3l (config-if) # no switchport sw-3l (config-if) # ip addrees 10.1.1.1 255.0.0.0 sw-3l (config-vlan # no shutdown sw-3L (config) # interface f0/24 sw-3L (config-if) # switchport mode trunk 2 in sw-2L # vlan database sw-2L (vlan) # vlan 2 sw-2L (vlan) # vlan 3 sw-2L (vlan exit sw-2L (config) # interface range f0/11-15 sw-2L (config-if-range) # switchport mode access sw-2L (config-if-range) # switchport access vlan 2 sw-2L (config-if-range) # exit sw-2L (config) # interface range f0/16-23 sw-2L (config-if-range) # switchport mode access sw-2L (config-if-range) # switchport access vlan 3 sw-2L (config-if-range) # exit sw-2L (config) # interface f0/24 sw-2L (config-if) # switchport mode trunk in the router (config) # interface f0/0 router (config) # ip address 10.1.1.2 route 0.0.0 router (config) # no shutdown www.2cto.com router (config) # router rip 1 Dynamic Route: router (config) # network 192.168.1.0 router (config) # network 192.168.2.0 2 or use static: router (config) # ip route 192.168.1.0 255.255.255 10.1.1.1 router (config) # ip route 192.168.2.0 255.255.255.255 10.1.1.1 3 if the host in VLAN 3 wants to access 10.1.1.2, add a route. Dynamic: router (config) # network 192.168.3.0 or: static: router (config) # ip route 192.168.3.0 255.255.255 10.1.1.1 this article is from the fat shark network