Cisco IOS Router VLAN Frustrations

Forums › LAN (ethernet/Wifi/routers/Bluetooth) › Cisco IOS Router VLAN Frustrations

nztim

4012 posts

Uber Geek
+1 received by user: 2710

ID Verified

Trusted

TEAMnetwork

Subscriber

#270560 14-May-2020 22:36

Hi There, this is tearing my hair our!

Objective: Switchport fastEthernet 0/0/0 is untagged VLAN1 and tagged VLAN2

RTR01#interface fastEthernet 0/0/0
RTR01(config-if)##switchport mode ?
access Set trunking mode to ACCESS unconditionally
dot1q-tunnel set trunking mode to TUNNEL unconditionally
trunk Set trunking mode to TRUNK unconditionally

it seems I can only really use access (single untagged VLAN only) or trunk (both VLANs Tagged) - I don't really dot1q-tunnel

Anyone with some insight into what I am missing?

Any views expressed on these forums are my own and don't necessarily reflect those of my employer.

Intravix

110 posts

Master Geek
+1 received by user: 49

#2484146 14-May-2020 23:09

You will want to configure it as a trunk port with a native VLAN (basically means that ingress untagged frames will be associated with the native vlan, and frames from that VLAN will be untagged on egress).

switchport mode trunk

switchport trunk native vlan 1

switchport trunk allowed vlan 2

nztim

4012 posts

Uber Geek
+1 received by user: 2710

ID Verified

Trusted

TEAMnetwork

Subscriber

#2484155 14-May-2020 23:42

Intravix:

You will want to configure it as a trunk port with a native VLAN (basically means that ingress untagged frames will be associated with the native vlan, and frames from that VLAN will be untagged on egress).

switchport mode trunk

switchport trunk native vlan 1

switchport trunk allowed vlan 2

Thanks that worked!

Got this error though! - Command rejected: Bad VLAN allowed list. You have to include all default vlans, e.g. 1-2,1002-1005.

Google suggests that because the IOS is old, not a big to include them though!

Any views expressed on these forums are my own and don't necessarily reflect those of my employer.