Routing Between VLANs with SVI and switch L3 routed port

before we go into the SW1 and configure SVI and routed port, let’s prepare the R1 and R2 first
configure addressing for R1 interfaces, and enable routing protocol

R1(config)#interface fastEthernet 0/0
R1(config-if)#ip add 10.0.0.2 255.255.255.0
R1(config-if)#no shut
R1(config-if)#int lo 0
R1(config-if)#ip add 10.1.1.1 255.255.255.255
R1(config)#router eigrp 1
R1(config-router)#no auto-summary
R1(config-router)#net 0.0.0.0

verify all interfaces are advertised by EIGRP, do the same to check on R2 later

R1(config-router)#do sh ip ei int
IP-EIGRP interfaces for process 1
                        Xmit Queue   Mean   Pacing Time   Multicast    Pending
Interface        Peers  Un/Reliable  SRTT   Un/Reliable   Flow Timer   Routes
Fa0/0              0        0/0         0       0/1            0           0
Lo0                0        0/0         0       0/1            0           0

configure R2

R2(config)#int fastEthernet 0/0
R2(config-if)#ip add 172.16.0.2 255.255.255.0
R2(config-if)#no shut
R2(config-if)#int fa 0/1
R2(config-if)#ip add 192.168.0.99 255.255.255.0
R2(config-if)#no shut
R2(config)#router eigrp 1
R2(config-router)#no auto-summary
R2(config-router)#network 0.0.0.0

now let’s get to our main topic, routing on switch using Switch Virtual Interface and enabling routing on layer 2 switchport by converting it to layer 3 routed port.
first we need to enable routing on SW1

SW1(config)#ip routing

create VLAN 10 and assign access port to it

SW1(config)#vlan 10
SW1(config-vlan)#name LAB
SW1(config)#int gi 0/47
SW1(config-if)#switchport mode access
SW1(config-if)#switchport access vlan 10

configure EIGRP

SW1(config)#router eigrp 1
SW1(config-router)#no auto-summary
SW1(config-router)#net 0.0.0.0

create VSI for VLAN 10

SW1(config)#interface vlan 10
SW1(config-if)#ip add 10.0.0.1 255.255.255.0

 

now SW1 should be able to route any traffic coming from access port VLAN 10 to other VLAN or network and vice versa. verify this

SW1#sh ip route
…
     172.16.0.0/24 is subnetted, 1 subnets
C       172.16.0.0 is directly connected, GigabitEthernet0/48
     10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C       10.0.0.0/24 is directly connected, Vlan10
D       10.1.1.1/32 [90/130816] via 10.0.0.2, 00:51:28, Vlan10
D    192.168.0.0/24 [90/30720] via 172.16.0.2, 00:23:12, GigabitEthernet0/48

for the other side, on interface that connected to R2, we’ll change the switchport into a layer 3 routed port, only using one command ‘no switchport’

SW1(config)#interface gi 0/48
SW1(config-if)#no switchport
SW1(config-if)#ip add 172.16.0.1 255.255.255.0
SW1(config-if)#no shut

verify this by ping from pc to loopback 0, ping success, meaning both our SVI and L3 routed port are working correctly.

Pinging 10.1.1.1 with 32 bytes of data:
Reply from 10.1.1.1: bytes=32 time=9ms TTL=253
Reply from 10.1.1.1: bytes=32 time=1ms TTL=253
Reply from 10.1.1.1: bytes=32 time=1ms TTL=253
Reply from 10.1.1.1: bytes=32 time=1ms TTL=253
C:\Windows\System32>tracert 10.1.1.1
Tracing route to 10.1.1.1 over a maximum of 30 hops
  1     5 ms    <1 ms    <1 ms  192.168.0.99
  2     2 ms     4 ms     4 ms  172.16.0.1
  3     2 ms     1 ms     1 ms  10.1.1.1