The Nokia layer 2 switch must not have the default virtual local area network (VLAN) assigned to any host-facing switch ports.

In a VLAN-based network, switches use the default VLAN (i.e., VLAN 1) for in-band management and to communicate with other networking devices using Spanning Tree Protocol (STP), Dynamic Trunking Protocol (DTP), VLAN Trunking Protocol (VTP), and Port Aggregation Protocol (PAgP), which is all untagged traffic. As a consequence, the default VLAN may unwisely span the entire network if not appropriately pruned. If its scope is large enough, the risk of compromise can increase significantly.

Review the switch configurations and verify no access switch ports have been assigned membership to the default VLAN (i.e., VLAN 1). The service access points (SAPs) are configured to allow specific VLANs. Use the command below and verify the VLAN tag used for all SAPs. When wild card "*" is configured in the VLAN tag portion of the SAP, it allows all VLAN tags, including VLAN 1. For any port to be part of a virtual private local area network service (VPLS), the port must be configured for that service. Just enabling a port does not give the port access to a bridge domain. VLAN configuration is also part of configuring a port for a VPLS service. - show service sap-using Service Access Points PortId SvcId Ing. Ing. Egr. Egr. Adm Opr QoS Fltr QoS Fltr 1/1/c1/1:200 200 1 none 1 none Up Up 1/1/c1/1:300 300 1 none 1 none Up Up If a port is configured with null encapsulation, it will allow all VLAN tags. Verify access ports are configured with "Port Encp" set to "dotq" or "qinq": - show port Ports on Slot 1 Port Admin Link Port Cfg Oper LAG/ Port Port Port C/QS/S/XFP/ Id State State MTU MTU Bndl Mode Encp Type MDIMDX 1/1/c1/1 Up Yes Up 1518 1518 - accs dotq cgige 1/1/c2 Up Link Up conn 100G CWDM4 M* If access ports are assigned to the default VLAN, this is a finding.

Remove the assignment of the default VLAN from all access switch ports. Remove the access VPLS service ports using the default VLAN or wildcard VLAN tag "*" in VPLS SAP configurations: - configure service vpls <service id> - sap <port id:vlan tag> shutdown - no sap <port id:vlan tag>