Hello @kodanda Ramji C S when you use overlapping VLAN pools with different physical domains in the same Endpoint Group (EPG) in Cisco ACI; it can lead to network issues, such as packet drops, because of VLAN ID conflicts. When VLANs overlap, the same VLAN ID might be assigned to different physical domains, causing confusion in the network and leading to packet misrouting or drops.
Here are some steps and best practices to mitigate this issue:
1. Avoid Overlapping VLAN Pools
- Unique VLAN Pools: Ensure that each physical domain has a unique VLAN pool assigned to it. This prevents VLAN ID conflicts and ensures that each VLAN ID is unique within the ACI fabric.
- Segregate VLAN Pools: Create separate VLAN pools for each physical domain and ensure that these pools do not overlap.
2. Use Different EPGs for Different Domains
- Domain-Specific EPGs: Create separate EPGs for each physical domain. This way, each EPG can have its own VLAN pool, avoiding any overlap.
- Domain Association: Associate each EPG with the appropriate physical domain and VLAN pool.
3. Check VLAN Pool Configuration
- Review VLAN Pools: Double-check the configuration of your VLAN pools to ensure there are no overlaps.
- Adjust VLAN Ranges: If overlaps are found, adjust the VLAN ranges to ensure they are unique across different physical domains.
4. Monitor and Troubleshoot
- Monitoring Tools: Use ACI monitoring tools to keep an eye on VLAN assignments and traffic patterns. This can help you quickly identify and resolve any issues.
- Logs and Alerts: Set up logging and alerts to notify you of any VLAN conflicts or packet drops.
HTH
Ashe
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