eNSP - inter-Vlan routing

With Vlan implementation many users are cutoff from other users within other vlan domains. To establish connectivity between Vlan's a Layer 3 device is needed.

topology: (inter-vlan routing with a router)

1 - Create Vlans:

[S1] vlan batch 10 20

note: use "display vlan" to see Vlan database.

2 - Configure access ports:

[S1] interface e0/0/1
[S1-Ethernet0/0/1] port link-type access
[S1-Ethernet0/0/1] port default vlan 10
[S1-Ethernet0/0/1] interface e0/0/2
[S1-Ethernet0/0/2] port link-type access
[S1-Ethernet0/0/2] port default vlan 20

note: use "display port vlan" to see which ports are assigned to which vlans.

3 - Configure trunk on the switch:

[S1] interface g0/0/1
[S1-GigabitEthernet0/0/1] port link-type trunk
[S1-GigabitEthernet0/0/1] port trunk allow-pass vlan all

4 - Configure trunk on the router:

[R1] interface g0/0/0
[R1-GigabitEthernet0/0/0] interface g0/0/0.10
[R1-GigabitEthernet0/0/0.10] dot1q termination vid 10
[R1-GigabitEthernet0/0/0.10] ip address 192.168.10.1 24
[R1-GigabitEthernet0/0/0.10] arp broadcast enable
[R1-GigabitEthernet0/0/0.10] interface g0/0/0.20
[R1-GigabitEthernet0/0/0.20] dot1q termination vid 20
[R1-GigabitEthernet0/0/0.20] ip address 192.168.20.1 24
[R1-GigabitEthernet0/0/0.20] arp broadcast enable

note: ARP broadcast is disable by default, if ARP broadcast remains disable the router will discard the packets. By enabling ARP broadcast on the sub-interface the router is able to construct a tagged ARP broadcast packet and send the packet from the sub-interface.

5 - Assign IP addresses to clients:

Client 1

IP - 192.168.10.100

MASK - 255.255.255.0

GW - 192.168.10.1

Client 2 

IP - 192.168.20.100

MASK - 255.255.255.0

GW - 192.168.20.1

Connectivity test

topology: (L3 switch based vlan routing)

1 - Create vlans:

[S1] vlan batch 10 20 30 40

[S2] vlan batch 10 20 30 40

2 - Assign ports to vlans:

[S1] interface e0/0/1
[S1-Ethernet0/0/1] port link-type access
[S1-Ethernet0/0/1] port default vlan 10
[S1-Ethernet0/0/1] interface e0/0/2
[S1-Ethernet0/0/2] port link-type access
[S1-Ethernet0/0/2] port default vlan 20

[S2] interface e0/0/1
[S2-Ethernet0/0/1] port link-type access
[S2-Ethernet0/0/1] port default vlan 40
[S2-Ethernet0/0/1] interface e0/0/2
[S2-Ethernet0/0/2] port link-type access
[S2-Ethernet0/0/2] port default vlan 30

3 - Configure trunk:

[S1] interface g0/0/1
[S1-GigabitEthernet0/0/1] port link-type trunk
[S1-GigabitEthernet0/0/1] port trunk allow-pass vlan all

[S2] interface g0/0/1
[S2-GigabitEthernet0/0/1] port link-type trunk
[S2-GigabitEthernet0/0/1] port trunk allow-pass vlan all

4 - Configure Vlanif interfaces:

[S1] interface vlanif 10
[S1-VlanIf10] ip address 192.168.10.1 24
[S1-VlanIf10] interface vlanif 20
[S1-VlanIf20] ip address 192.168.20.1 24
[S1-VlanIf20] interface vlanif 30
[S1-VlanIf30] ip address 192.168.30.2 24
[S1-VlanIf30] interface vlanif 40
[S1-VlanIf40] ip address 192.168.40.2 24

[S2] interface vlanif 10
[S2-VlanIf10] ip address 192.168.10.2 24
[S2-VlanIf10] interface vlanif 20
[S2-VlanIf20] ip address 192.168.20.2 24
[S2-VlanIf20] interface vlanif 30
[S2-VlanIf30] ip address 192.168.30.1 24
[S2-VlanIf30] interface vlanif 40
[S2-VlanIf40] ip address 192.168.40.1 24

note: Vlan routing is implemented by creating vlan interfaces that operate as a gateway for each vlan within  the layer 3 switch.

Connectivity test