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V-286555

CAT II (Medium)

The Aviat WTM must have the default VLAN pruned from all trunk ports that do not require it.

Rule ID

SV-286555r1274093_rule

STIG

Aviat Networks WTM L2 Security Technical Implementation Guide

Version

V1R1

CCIs

CCI-000366

Discussion

The default VLAN (i.e., VLAN 1) is a special VLAN used for control plane traffic such as Spanning-Tree Protocol (STP), Dynamic Trunking Protocol (DTP), VLAN Trunking Protocol (VTP), and Port Aggregation Protocol (PAgP). VLAN 1 is enabled on all trunks and ports by default. With larger campus networks, care needs to be taken about the diameter of the STP domain for the default VLAN. Instability in one part of the network could affect the default VLAN, thereby influencing control-plane stability and therefore, STP stability for all other VLANs.

Check Content

Verify the Aviat WTM has VLAN 1 pruned from all trunk ports with the following steps:

1. Log on to the Web UI using an admin account.
2. Using the Web UI, navigate to Switching and Routing >> VLAN Management >> Membership.
3. For each trunk port, verify VLAN 1 is not included in the tagged VLAN list.

If VLAN 1 is permitted on any trunk port, this is a finding.

Fix Text

Configure the Aviat WTM to remove VLAN 1 from all trunk ports with the following steps:

1. Log on to the Web UI using an admin account.
2. Using the Web UI, navigate to Switching and Routing >> VLAN Management >> Membership.
3. For each trunk port, remove VLAN 1 from the tagged VLAN list.
4. Click "Commit".