The RUCKUS ICX switch must not have the default VLAN assigned to any host-facing switch ports.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-273689	SRG-NET-000512-L2S-000008	RCKS-L2S-000220	SV-273689r1111059_rule	2025-06-03	1

Description
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)—all untagged traffic. Therefore, 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.

Description

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)—all untagged traffic. Therefore, 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.

ℹ️ Check
Review the switch configurations and verify that no access switch ports have been assigned membership to the default VLAN. Router#show vlans PORT-VLAN 5, Name DEFAULT-VLAN], Priority level0, in single spanning tree domain Untagged Ports: None Tagged Ports: (U1/M1) 1 2 5 7 9 11 Mac-Vlan Ports: None Monitoring: Disabled If there are access switch ports assigned to the default VLAN, this is a finding.

ℹ️ Check

Review the switch configurations and verify that no access switch ports have been assigned membership to the default VLAN. Router#show vlans PORT-VLAN 5, Name DEFAULT-VLAN], Priority level0, in single spanning tree domain Untagged Ports: None Tagged Ports: (U1/M1) 1 2 5 7 9 11 Mac-Vlan Ports: None Monitoring: Disabled If there are access switch ports assigned to the default VLAN, this is a finding.

✔️ Fix
Remove the assignment of the default VLAN from all access switch ports. 1. Remove the default VLAN. Router(config-vlan-5)#tag ethernet 1/1/48 Added tagged port(s) ethernet 1/1/48 to port-vlan 5. Router(config-vlan-5)# 2. Save the configuration. Router(config-vlan-5)# write memory Note: The Default VLAN ID can be configurable by the administrator.