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Added note on prefixes shorter than /48

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Brian E Carpenter
2024-02-08 14:26:37 +13:00
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6. Management and Operations/Multihoming.md
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@@ -42,6 +42,11 @@ select at least two ISPs to provide redundant connectivity to the
Internet, and arrange for both of them to advertise a BGP-4 route to
that prefix.
A /48 prefix provides the theoretical capacity for more than 65 thousand
subnets. However, extremely large enterprises can obtain prefixes shorter
than /48 from one of the address registries, if they provide an adequate
technical justification.
Internal routing must be arranged to direct traffic as required, using
routing metrics that favor one ISP or another, or spread the load, as
desired. When the egress to a particular ISP fails, backup routes to an