BCMSN Lab - Multi-Layer Switching (MLS) Configuration [CCNP]

3 steps for the setup

(1) Create SVI's & enable ip routing

(2) Create routed ports (optional)

(3) Enable routing ports (optional)

Step 1 - Create SVI's [Switch Virtual Interface - SVI's take place of a 'router on a stick' (not a physical port)]

S4#conf t

S4(config)#interface vlan 10 (Just like that we have created an SVI 10)

S4(config-if)#ip address 10.1.10.1 255.255.255.0

S4(config-if)#no shut

S4(config-if)#exit

S4(config)#int vlan 20

S4(config-if)#ip addr 10.1.20.1 255.255.255.0

S4(config-if)#no shut

S4(config-if)#exit (this creates SVI's 10 and 20)

S4(config)#ip routing (<-Very imp cmd: This enables you to route between Vlan 10 & Vlan 20)

Step 2 - Create routed ports [In this case, we'll make fa0/3 and fa0/4 routed ports (instead of trunk ports). This makes the L3 switch like another router as if both routers are connected using a crossover cable]

S4(config)#int fa0/3

S4(config-if)#no switchport (This makes it a router)

S4(config-if)#ip address 10.1.3.1 255.255.255.252

S4(config-if)#no shut

S4(config)#int fa0/4

S4(config-if)#no switchport

S4(config-if)#ip address 10.1.4.1 255.255.255.252

S4(config-if)#no shut

S4(config-if)#exit

Step 3 - Enable routing ports

S4(config)#router eigrp 1

S4(config-router)#no auto-summary

S4(config-router)#network 10.0.0.0 (<- This will form a neighbor relationship with the neighboring router...on a switch. (S4, once S4 is configured similarly using the 3 steps)

Lastly, configure S4 similarly, except with different ip's on the same subnet (for ports fa0/3 and fa0/4 that server as it's trunk links)

Note: int fa0/2 on the L3 Switch will remain a 'switchport' (don't use the 'no switchport' cmd there) as that's a trunk port.