In campus network design, theegressis a critical point that connects the internal campus network to external networks such as the Internet or WAN. According to HCIP Datacom Campus Network architecture guidelines, ensuringhigh reliability at the egressis essential, even for small- and medium-sized campus networks, because external connectivity directly affects business continuity.

Deployingmulti-carrier linksat the egress is a recommended design practice to enhance reliability. Multi-carrier links refer to connecting the campus network todifferent service providersor independent external links. If one carrier experiences a failure, congestion, or maintenance issue, traffic can be switched to the backup carrier, ensuring uninterrupted external access. This approach significantly reduces the risk of service disruption caused by single-link or single-carrier failures.

For small- and medium-sized campuses, full redundancy with complex architectures may not be cost-effective. Multi-carrier backup links provide acost-efficient and practical solutionthat balances reliability and investment. Technologies such as static route backup, dynamic routing protocols, or policy-based routing can be used to implement automatic failover at the egress.

HCIP Datacom documentation emphasizes that egress reliability is not only a concern for large networks. Even smaller campuses require stable Internet and WAN access for cloud services, remote access, and centralized management platforms. Therefore, deploying multi-carrier links as backup at the egress is a valid and recommended design strategy.

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