Tagged VLAN 1 In a Trunk Is a Really Bad Idea
Different interpretations of VLAN 1 in trunk configurations between Cumulus NVUE and Arista EOS highlight the importance of using VLAN 1 as a native VLAN.
MAIN POINTS
- Cumulus NVUE treats VLAN 1 in a trunk as tagged, while Arista EOS sees it as native.
- The issue was highlighted through a netlab configuration template discussion.
- The recommendation is to avoid using VLAN 1 in VLAN trunks.
- If VLAN 1 must be used, it should be configured as a native VLAN.
TAKEAWAYS
- VLAN 1 interpretations can vary between different network systems, leading to potential configuration conflicts.
- Consistent VLAN configuration practices are crucial to avoid network issues.
- Retrospective insights suggest enforcing VLAN 1 as a native VLAN could prevent confusion.
- Understanding system-specific VLAN handling is essential for effective network management.