Hi,
I've been trying to setup inter vlan routing using a multilayer switch, however I'm having some trouble getting it working.
I've followed a couple of tutorials I've read online but still can't get it to work. It will ping within the same vlan, but not across different vlans.
One thing I've been unable to do is use the 'switchport trunk encapsulation dot1q' command on the layer 2 switch trunk ports. I'm not sure what this command does though, so I don't know if it's needed.
Can anyone help with this?
Here are the configs for the two layer 2 switches and the multilayer switch:
Switch1:
interface Port-channel1
switchport mode trunk
!
interface FastEthernet0/1
switchport mode trunk
channel-group 1 mode active
!
interface FastEthernet0/2
switchport mode trunk
channel-group 1 mode active
!
interface FastEthernet0/10
switchport access vlan 10
switchport mode access
!
interface FastEthernet0/11
switchport access vlan 20
switchport mode access
!
interface Vlan1
no ip address
shutdown
!
interface Vlan10
mac-address 0001.97c3.a001
ip address 192.168.10.1 255.255.255.0
!
interface Vlan20
mac-address 0001.97c3.a002
ip address 192.168.20.1 255.255.255.0
!
interface Vlan30
mac-address 0001.97c3.a004
ip address 192.168.30.1 255.255.255.0
!
interface Vlan40
mac-address 0001.97c3.a005
ip address 192.168.40.1 255.255.255.0
!
Switch 2:
interface Port-channel2
switchport mode trunk
!
interface FastEthernet0/1
switchport mode trunk
channel-group 2 mode active
!
interface FastEthernet0/2
switchport mode trunk
channel-group 2 mode active
!
interface FastEthernet0/10
switchport access vlan 10
switchport mode access
!
interface FastEthernet0/11
switchport access vlan 30
switchport mode access
!
interface Vlan1
no ip address
shutdown
!
interface Vlan10
mac-address 0007.ecc6.3901
ip address 192.168.10.1 255.255.255.0
!
interface Vlan20
mac-address 0007.ecc6.3902
ip address 192.168.20.1 255.255.255.0
!
interface Vlan30
mac-address 0007.ecc6.3903
ip address 192.168.30.1 255.255.255.0
!
interface Vlan40
mac-address 0007.ecc6.3904
ip address 192.168.40.1 255.255.255.0
!
Multilayer Switch:
interface Port-channel1
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface Port-channel2
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface Port-channel3
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface Port-channel4
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface FastEthernet0/1
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 1 mode active
!
interface FastEthernet0/2
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 1 mode active
!
interface FastEthernet0/3
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 2 mode active
!
interface FastEthernet0/4
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 2 mode active
!
interface FastEthernet0/5
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 3 mode active
!
interface FastEthernet0/6
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 3 mode active
!
interface FastEthernet0/7
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 4 mode active
!
interface FastEthernet0/8
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 4 mode active
!
interface GigabitEthernet0/1
no switchport
ip address 10.1.1.1 255.255.255.252
duplex auto
speed auto
!
interface GigabitEthernet0/2
!
interface Vlan1
no ip address
shutdown
!
interface Vlan10
mac-address 0002.1658.5d01
ip address 192.168.10.1 255.255.255.0
!
interface Vlan20
mac-address 0002.1658.5d02
ip address 192.168.20.1 255.255.255.0
!
interface Vlan30
mac-address 0002.1658.5d03
ip address 192.168.30.1 255.255.255.0
!
interface Vlan40
mac-address 0002.1658.5d04
ip address 192.168.40.1 255.255.255.0
!
Here's the section of the topology I'm configuring:
Thanks,
-Stuart
Accepted Solutions
Hi @Stuart D ,
Review your exercise and I found these details about concepts:
-The VLAN interface of the L2 switches is only for administration, so you should not assign the VLAN gateway in that interface.
In the administration interface, a valid ip of the VLAN must be assigned, as well as a gateway for the switch:
As you see in the image, I deleted all the VLAN interfaces that were not the administration one and assigned it the VLAN gateway(I changed the gateway IP, I'll explain why later).
I replicated this process on all the L2 switches in your topology.
-In the two switch L3 you had the same IP configured in the VLAN interfaces.
If you want to achieve redundancy, this is incorrect, since the devices do not know which of these L3 is his gateway.
To achieve redundancy in this topology, you must use the HSRP protocol, which assigns a virtual gateway to the devices (192.168.x.100) and assigns roles (active / standby) to the L3 switches:
The L3 switch on the left will remain as active, so in the L3 switch on the right the same commands are entered, except the priority one, since it is already 100 by default:
Sorry if I went long, but I wanted to explain the concepts.
I enclose the exercise with the changes.
Regards
Hi @Stuart D ,
Review your exercise and I found these details about concepts:
-The VLAN interface of the L2 switches is only for administration, so you should not assign the VLAN gateway in that interface.
In the administration interface, a valid ip of the VLAN must be assigned, as well as a gateway for the switch:
As you see in the image, I deleted all the VLAN interfaces that were not the administration one and assigned it the VLAN gateway(I changed the gateway IP, I'll explain why later).
I replicated this process on all the L2 switches in your topology.
-In the two switch L3 you had the same IP configured in the VLAN interfaces.
If you want to achieve redundancy, this is incorrect, since the devices do not know which of these L3 is his gateway.
To achieve redundancy in this topology, you must use the HSRP protocol, which assigns a virtual gateway to the devices (192.168.x.100) and assigns roles (active / standby) to the L3 switches:
The L3 switch on the left will remain as active, so in the L3 switch on the right the same commands are entered, except the priority one, since it is already 100 by default:
Sorry if I went long, but I wanted to explain the concepts.
I enclose the exercise with the changes.
Regards
