No, you do not need to have two different ASNs on your router to connect to two different ISPs, each with its own ASN. In fact, it is common and practical to use a single ASN of your own to handle multiple BGP connections with different Internet Service Providers (ISPs).

We explain how you can configure this:

1. Unique ASN: Your network will be assigned a unique Autonomous System Number (ASN) that identifies you as an independent autonomous system (AS) on the Internet. This ASN is used for all BGP sessions you establish, regardless of the number of connections to different ISPs you have.
2. Multiple BGP Sessions: You set up a separate BGP session with each ISP. Each BGP session will be configured with the ASN of your network and the ASN of the corresponding ISP. This means that you will have, for example, a BGP session using tu ASN y ASN del ISP 1 and another session using tu ASN y ASN del ISP 2.
3. Routing Policies: You can set routing policies to manage how incoming and outgoing traffic is selected through each ISP. This can be done using BGP attributes such as LOCAL_PREF, AS_PATH, or MED to influence routing decisions and handle redundancy and load balancing.
4. Route Filtering: It is important to implement proper filtering policies to ensure that you advertise and receive only the desired routes from each ISP. This helps prevent problems such as route leaks or receiving unwanted routes.
5. Network Maintenance: You should regularly review and maintain your BGP configurations to ensure they meet your performance, security, and redundancy needs.

Using a single ASN for multiple BGP connections is standard practice and makes it easier to manage your network's external connections. Make sure you have good coordination and communication with each ISP to ensure that BGP configurations are correct and effective.