EXOS Switch not allowing inter-vlan traffic (LAB)

JoeS — Sat, 20 Nov 2021 05:45:25 GMT

I'm new here and starting to learn EXOS. I working on a simple set up/lab, 1 Extreme switch (GNS3 lab - EXOC VM 30.5.1) and two PCs (VLAN 10=172.16.10.2/24 & VLAN 20=172.16.20.2/20). All I'm trying to do is to have one PC ping the other. I have enabled ipforwarding for the vlans, but still no communication. Not sure what I'm missing. Config listed below - any input is always appreciated. thanks

EXOS-VM.30 # sho config
#
# Module devmgr configuration.
#
configure snmp sysContact "https://www.extremenetworks.com/support/"
configure sys-recovery-level switch reset
#
# Module vlan configuration.
#
configure vlan default delete ports all
configure vr VR-Default delete ports 1-12
configure vr VR-Default add ports 1-12
configure vlan default delete ports 1-2
configure vlan untagged-ports auto-move on
create vlan "FINANCE"
configure vlan FINANCE tag 30
create vlan "HR"
configure vlan HR tag 10
create vlan "IT"
configure vlan IT tag 20
create vlan "SALES"
configure vlan SALES tag 40
configure vlan Default add ports 3-12 untagged
configure vlan FINANCE add ports 12 tagged
configure vlan HR add ports 12 tagged
configure vlan HR add ports 1 untagged
configure vlan IT add ports 12 tagged
configure vlan IT add ports 2 untagged
configure vlan SALES add ports 12 tagged
configure vlan FINANCE ipaddress 172.16.30.2 255.255.255.0
enable ipforwarding vlan FINANCE
configure vlan HR ipaddress 172.16.10.2 255.255.255.0
enable ipforwarding vlan HR
configure vlan IT ipaddress 172.16.20.2 255.255.255.0
enable ipforwarding vlan IT
configure vlan SALES ipaddress 172.16.40.2 255.255.255.0
enable ipforwarding vlan SALES
==========================================
EXOS-VM.31 # sho port vla
Untagged
Port /Tagged VLAN Name(s)
-------- -------- ------------------------------------------------------------
1 Untagged HR
2 Untagged IT
3 Untagged Default
4 Untagged Default
5 Untagged Default
6 Untagged Default
7 Untagged Default
8 Untagged Default
9 Untagged Default
10 Untagged Default
11 Untagged Default
12 Untagged Default

Re: EXOS Switch not allowing inter-vlan traffic (LAB)

JoeS — Sun, 21 Nov 2021 16:17:25 GMT

Resolved: I misconfigured the gateway IP addresses on the VPCS (PCs). I'm still learning GNS3.

Re: EXOS Switch not allowing inter-vlan traffic (LAB)

MyraMWinslow — Mon, 28 Sep 2026 19:25:26 GMT

I’d start by checking the VLAN configuration and confirming that the switch has the correct Layer 3 interfaces and routing enabled. It’s also worth verifying the default gateway on each VLAN, along with any ACLs or firewall rules that could be blocking the traffic. Testing connectivity between the VLAN interfaces separately can help narrow down where the issue is occurring.

I like troubleshooting in the same step-by-step way with other calculators too. For example, when I need to work out what a particular hourly rate actually means over a week or month, an hourly wage calculator is much quicker than doing all the conversions manually.

topic Re: EXOS Switch not allowing inter-vlan traffic (LAB) in ExtremeSwitching (EXOS/Switch Engine)

EXOS Switch not allowing inter-vlan traffic (LAB)

Re: EXOS Switch not allowing inter-vlan traffic (LAB)

Re: EXOS Switch not allowing inter-vlan traffic (LAB)