09-11-2019 12:00 PM - edited 09-11-2019 12:01 PM
Hello All,
my name is Kyle and I have secured a new job and am starting to manage my new network.
I am a bit confused as to how my routing statements should be setup on my switches.
I have tried to loosely setup our network in packet tracer to see where I am messing up my route statements at.
I have uploaded a loose copy of our network diagram here :
I have applied the ip addresses listed above each device to VLAN 1 on all the 3560's.
I have entered route statements on each 3560 pointing to the ip address on the vlan of the switch i want the traffic to go to.
so as an example on Switch 1 I entered 10.10.158.0 255.255.255.0 10.10.157.251
then on switch 2 I entered 10.10.158.0 255.255.255.0 10.10.158.248
all ports are in the default VLAN of VLAN 1. The links in between are trunk links.
Is this not correct? I am not able to get connectivity between my two PC's in my packet tracer example
09-11-2019 11:41 PM
Hi there,
There is something not right with your configuration.
You only mention VLAN1 in your topology, yet your static route statements show the subnet 10.10.158.0/24 which implies that you must also have 10.10.157.0/24 which will need to be in a VLAN of its own.
It is hard to determine from your diagram, but either switch2 or switch3 must have a Layer3 interface in both VLANs. It is this switch which you should configure as the VLAN/ subnet gateway.
For example, say it is switch2. The config should look like:
! vlan1,2 ! int vlan 1 ip address 10.10.157.251 255.255.255.0 ! int vlan 2 ip address 10.10.158.251 255.255.255.0 ! int fa0/1 switchport mode trunk switchport trunk allowed vlan 1 no shut ! int fa0/24 switchport mode trunk switchport trunk allowed vlan 2 no shut !
ip routing
!
Now on switch 1:
! int fa0/1 switchport mode trunk switchport trunk allowed vlan 1 no shut ! int fa0/24 switchport mode access switchport access vlan 1 not shut ! ip route 10.10.158.251 255.255.255.0 10.10.157.251 !
Switch3:
! vlan 2 ! int range fa0/1, fa0/24 switchport mode trunk switchport trunk allowed vlan 2 no shut ! ip route 10.10.157.251 255.255.255.0 10.10.158.251 !
Switch4:
! int fa0/1 switchport mode trunk switchport trunk allowed vlan 2 no shut ! int fa0/24 switchport mode access switchport access vlan 2 not shut ! ip route 10.10.157.251 255.255.255.0 10.10.158.251 !
Now for the PCs, they need the following gateways configured:
PC0 : 10.10.157.251 PC1 : 10.10.158.251
What we have achieved is a Layer2 network (VLAN1) from Switch2 towards PC0 and also extended the Layer2 network (VLAN2) from switch2 to PC1 via switches 3 and 4. Switch2 acts as the Layer3 gateway for both subnets and it is there that we do the inter-VLAN routing.
cheers,
Seb.
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