05-24-2020 02:54 PM
Hi
I'm currently training to get my CCNA. I hope I'm in the right place to ask about a problem I am facing.
So i set up a simple network on Packet Tracer. One switch connected with for PCs. Originally on VLAN 1, everyone was pinging everyone, no problems.
Then I created two new VLANs, VLAN 2 and VLAN 3. I set them up lke this:
PC-1 and PC-2 on VLAN 2
PC-3 and PC-4 on VLAN 3
From PC-1 I can ping PC-2 and the switch, likewise from PC-2.
From PC-3 I can ping PC-4 but not the switch. Same thing from PC-4.
From the switch I can only ping the PCs in VLAN 2.
I can ping VLAN 3 PCs only when I turn off VLAN 2.
I turned off VLAN 1 just to test it, nothing
It is the same situation when the VLANs have the same IP or different ones.
What is going on?
05-24-2020 03:01 PM
05-24-2020 03:38 PM
You probably do not use L3 switch, right? L2 switch can have just 1 SVI, aka interface vlan X, with IP address while L3 sw can have many SVIs.
Normally PCs in the same vlan x will be able to communicate with each others; if PC in vlan x wants to talk to PC in Vlan Y, routing must be involved via a router (via ROAS) or L3 switch (via SVIs).
Each SVI interface correspond to vlan # and subnet; usually u should have 1 subnet per 1 vlan.
PT has different switch icons for L2 and L3 switches
05-24-2020 03:48 PM
Hi
I attached the PT file.
My issue isn't with VLAN-2 not pinging with VLAN-3. I understand that I need a L3 device or a multi-layer switch to do that.
The network is technically working as designed, the PCs broadcasts domain are separated into two VLANs. I'm just confused why I can't ping VLAN-3 PCs from the switches CLI. And can't ping the switch from VLAN 3 PCs.
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