Does cdn affect seo？

CDN is a distributed content delivery network built on data networks. Its role is to utilize clustered streaming servers to overcome the drawbacks of insufficient bandwidth and concurrency capabilities in single-server systems, greatly enhancing the number of concurrent streams supported and reducing or avoiding adverse effects from single-point failures.

CDN employs global load balancing technology to direct user access to the nearest and operational streaming server, which directly responds to user requests.

Simply put, employing CDN can accelerate site access speeds across various nodes, ensuring users nationwide do not encounter delays due to server address routing or ISP issues. Additionally, CDN protects the actual IP of site servers, effectively defending against network attacks, enhancing site stability and security, and providing some SEO optimization benefits.

Impact of CDN on SEO

Because CDN is a distributed content delivery network, accessing from different regions connects to different CDN servers, causing the IP address from which search engine spiders fetch content to frequently change.

When fetching content, search engines do not directly access via domain name resolution but rather cache resolved addresses for faster access, fetching content directly via IP address. The frequent IP changes when accessing CDN can lead to content fetching failures by search engines, negatively impacting website indexing and stability.

CDN Origin Fetching

To address content fetching failures by search engine spiders, spider-origin fetching needs to be implemented. Generally, various DNS providers support search engine line parsing for spider-origin fetching, such as common services like Alibaba Cloud DNS and DNSPod.

Alternatively, CDN systems can also handle origin fetching, but support varies among CDN providers, making DNS-based spider-origin fetching preferable.

Implementation is straightforward: add a search engine parsing entry in domain resolution to direct it to the server's actual IP, ensuring site IP confidentiality while not hindering search engine-origin fetching. Remember to update DNS resolution if the site's real IP changes.

CDN Caching

When using CDN services, it's crucial to note that CDN servers cache website content to reduce performance loss and enhance site speed. However, this can cause issues when site content updates are not promptly reflected in CDN caches, leading to search engine content fetching failures and users being unable to access updated content in time.

After enabling CDN, the site gains multiple IPs, potentially affecting SEO?

Typically, having a fixed dedicated IP is considered beneficial for SEO. After enabling CDN, the website acquires dozens or even more IPs, potentially lowering site authority. Search engines like Baidu have not explicitly stated their stance on this issue. However, considering the following aspects suggests that using a high-quality CDN does not negatively impact SEO:

Baiduspider crawls sites the same way regular users access them. As long as users can smoothly access the website, search engines can fetch content regardless of the technology used.

CDN is widely used across websites without causing negative impacts.

However, potential negative impacts may arise if:

The CDN used is unstable, leading to frequent 5xx errors.

The CDN shares IPs with many grey websites, potentially affecting our site's IP reputation.