Question

Multiple untagged VLAN in one port

  • 9 September 2019
  • 1 reply
  • 67 views

Switch version: G3 series G3G124-24

We are planning to implement new switches but there are existing Enterasys switches. Some of the switches are configured with two untagged VLANs on the same port.

Could you explain what will happen with the traffic on these ports?

Please inform if any more information is required.

show vlan portinfo output:
testing(su)->show vlan portinfo
Port VLAN Ingress Egress
Filter Vlan
-----------------------------------------------------------------
ge.1.1 2 N untagged: 1,2
ge.1.2 2 N untagged: 1,2
ge.1.3 2 N untagged: 1,2
ge.1.4 2 N untagged: 1,2
ge.1.5 2 N untagged: 1,2
ge.1.6 2 N untagged: 1,2
ge.1.7 2 N untagged: 1,2
ge.1.8 2 N untagged: 1,2
ge.1.9 2 N untagged: 1,2
ge.1.10 2 N untagged: 1,2
ge.1.11 2 N untagged: 1,2
ge.1.12 2 N untagged: 1,2
ge.1.13 2 N untagged: 1,2
ge.1.14 2 N untagged: 1,2
ge.1.15 2 N untagged: 1,2
ge.1.16 2 N untagged: 1,2
ge.1.17 2 N untagged: 1,2
ge.1.18 2 N untagged: 1,2
ge.1.19 2 N untagged: 1,2
ge.1.20 2 N untagged: 1,2
ge.1.21 3 N untagged: 1,3

1 reply

Userlevel 5
Hi Dongwon,

Try 'show port vlan' as well. This command will tell you what the native VLAN ID is (the one to which the untagged traffic enters on that port). The command you use tells you what the native VLAN is and also the egress list for that port, i.e. from what VLANs the traffic will be considered to egress through that port (here, those will egress as untagged, but it's only about egress, not ingress, so no confusion with untagged frames reaching the switch).

Hope that helps,
Tomasz

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