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Because router configuration commands vary by vendor and platform (Cisco, Juniper, Nokia, Palo Alto, and others), the requirements on this page are vendor-neutral. Refer to your router’s documentation for the exact command syntax.

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Information Zayo provides

Zayo provides the following information for each DIA BGP connection. You’ll need it to complete your router configuration:

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Router configuration requirements

Your router must be configured with:
Your router must be able to reach the Zayo BGP peer IP address over the service interface, and TCP port 179 must be allowed through any firewall or ACL in the path.

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Prefix advertisement

Advertise only the public prefixes approved for your DIA BGP service. The advertised prefixes must match the approved service record. Apply outbound route filtering on your router to prevent accidental route leaks. Do not advertise:
  • Private IPv4 address space
  • Link-local prefixes
  • Documentation prefixes
  • Internal infrastructure routes
  • A default route toward DynamicLink, unless explicitly approved
  • The full internet routing table
  • Third-party routes not authorized for this service
  • Any prefix not assigned or approved for your organization

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Prefix length

For IPv4, advertise prefixes no longer than /24 unless explicitly approved. For IPv6, advertise prefixes no longer than /64 unless explicitly approved. Longer prefixes may receive special routing policy handling.

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Maximum prefix limit

The number of prefixes you advertise must not exceed the maximum prefix limit for your service. If you exceed the limit, the BGP session may be protected by platform policy.

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Supported BGP communities

DIA BGP supports the following BGP communities for routing policy control. You can attach these communities to prefixes you advertise to influence how Zayo handles them.
Only the communities listed above are supported for DIA BGP. Unsupported or undocumented communities may be ignored, removed, or handled differently by routing policy.

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Blackhole routing

If blackhole routing is enabled for your service, you can advertise an approved prefix with the 6461:5990 community to have traffic to that prefix discarded upstream at Zayo’s edge. Blackhole routes must be within your authorized prefix range. Use blackhole routing only when you intentionally want traffic to the advertised prefix dropped.