high availability configuration

[nexus9k]

Our scenario involves two ISPs, each providing us with a fiber drop. Additionally, we have two Nexus 93180yc-ex switches. We need to configure the network to enable routing without a single point of failure. This means that if one switch fails, the other one takes over. Similarly, if one ISP connection fails, the other connection takes over. Our objective is to ensure that both ISPs are utilized effectively.

Thanks

[M02@rt37]

Hello @nexus9k,

You can implement a dual-homed architecture with two Nexus 93180yc-ex switches.

--Connect one ISP to each Nexus switch using separate fiber drops.

--Configure a LAG between the two Nexus switches to provide redundancy and increase bandwidth.

--Configure OSPF or iBGP between the Nexus switches to enable routing without a single point of failure. This will ensure that both switches are aware of the available routes and can forward traffic in case of a failure.

[Ferenafotr34]

Hello nexus9k,

I am just want to tell you that to achieve high availability and redundancy in your network with two ISPs and two Nexus 93180yc-ex switches, you can implement a solution using various technologies and configurations. Here's a general outline of the steps involved:

1. ISP Connectivity: Connect each ISP's fiber drop to a separate Nexus 93180yc-ex switch. This ensures that each switch has a dedicated connection to a different ISP for redundancy.

2. BGP Routing: Implement Border Gateway Protocol (BGP) for routing between your network and the ISPs. BGP is the standard protocol used for routing between different autonomous systems (AS) on the internet.

3. Configure BGP Peering: Establish BGP peering sessions with both ISPs on each Nexus 93180yc-ex switch. This allows the switches to exchange routing information with the ISPs and receive routes from both ISPs.

4. Configure BGP Load Balancing: Enable BGP load balancing to effectively utilize both ISP connections. With load balancing, traffic can be distributed across both ISPs based on various criteria such as equal-cost multi-path (ECMP) or traffic engineering.

5. Configure Routing Protocols: Implement a dynamic routing protocol, such as OSPF (Open Shortest Path First) or EIGRP (Enhanced Interior Gateway Routing Protocol), between the Nexus switches. This ensures that the switches can exchange routing information and maintain network reachability within your local network.

6. Configure Routing Redundancy: Use features like Virtual Router Redundancy Protocol (VRRP) or Hot Standby Router Protocol (HSRP) to provide gateway redundancy within your local network. This ensures that if one switch fails, the other switch takes over the routing responsibilities and maintains network connectivity.

7. Configure Switch-to-Switch Connectivity: Connect the two Nexus 93180yc-ex switches together using a redundant link configuration, such as link aggregation (LACP) or spanning tree protocol (STP). This creates a redundant path between the switches, allowing for switch-level failover.

8. Test and Monitor: Once the configurations are in place, perform thorough testing to ensure failover and redundancy are working as expected. Monitor the network and utilize tools like SNMP (Simple Network Management Protocol) or NetFlow to monitor traffic and detect any issues or performance bottlenecks.