Hello @danra
Extending existing subnets from Cisco ACI (Application Centric Infrastructure) to Juniper VCF (Virtual Chassis Fabric) involves several steps to ensure proper Layer 2 or Layer 3 connectivity between the two environments. Below is a high-level guide to achieve this:
1. Plan the Network Design
Before making any changes, plan the network design to ensure proper connectivity and avoid IP conflicts. Key considerations include:
- Subnet details: Identify the subnets you want to extend.
- VLANs: Ensure VLANs are consistent between Cisco ACI and Juniper VCF.
- Routing: Decide whether the subnet will be extended at Layer 2 (bridged) or Layer 3 (routed).
- Connectivity: Determine the physical or logical links between Cisco ACI and Juniper VCF.
2. Configure Cisco ACI
In Cisco ACI, subnets are typically associated with Bridge Domains (BDs) and End Point Groups (EPGs). Follow these steps:
a. Identify the Bridge Domain and EPG
- Locate the Bridge Domain (BD) where the subnet is configured.
- Identify the EPG associated with the BD.
b. Enable Layer 2 or Layer 3 Connectivity
- If extending the subnet at Layer 2, ensure the BD has Unicast Routing disabled and Flood in Encapsulation enabled.
- If extending the subnet at Layer 3, ensure the BD has Unicast Routing enabled and the subnet is advertised.
c. Configure External Connectivity
- Create an External Routed Network (L3Out) or External Bridged Network (L2Out) in ACI to connect to the Juniper VCF.
- Define the VLANs and subnets that will be extended.
- Map the VLANs to the appropriate physical interfaces or port channels connecting to the Juniper VCF.
3. Configure Juniper VCF
On the Juniper VCF side, configure the corresponding VLANs, interfaces, and routing as needed.
a. Configure VLANs
- Create VLANs on the Juniper VCF that match the VLANs used in Cisco ACI.
- Assign the VLANs to the appropriate interfaces or port channels.
b. Configure Interfaces
- Configure the interfaces or port channels connecting to Cisco ACI.
- Use trunk mode to allow multiple VLANs if extending multiple subnets.
c. Configure Routing (if applicable)
- If extending the subnet at Layer 3, configure routing protocols (e.g., OSPF, BGP) between Cisco ACI and Juniper VCF.
- Advertise the subnet from Juniper VCF to the rest of the network.
4. Establish Connectivity
- Connect the physical or logical links between Cisco ACI and Juniper VCF.
- Verify that VLANs and subnets are properly extended.
5. Test and Validate
- Test connectivity between devices in the extended subnet.
- Use tools like
ping and traceroute to verify Layer 2 and Layer 3 connectivity.
- Check for any issues with ARP, MAC address learning, or routing.
6. Monitor and Troubleshoot
- Monitor the network for any anomalies or performance issues.
- Use logs and monitoring tools in both Cisco ACI and Juniper VCF to troubleshoot any problems.
Additional Notes
- Ensure that MTU settings are consistent across the Cisco ACI and Juniper VCF environments to avoid fragmentation issues.
- If using VXLAN in Cisco ACI, ensure that the Juniper VCF supports VXLAN or configure a gateway to translate VXLAN to VLAN.
- Properly document the configuration changes for future reference.
Hope This Helps!!!
AshSe
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