To protect the CenturyLink global network, CenturyLink limits the total BGP (border gateway protocol) route prefix announcements originated by the customer on each IQ Networking Port. A prefix is any BGP route announcement: a summary entry or a specific subnet. The specific limits vary, but are generally as follows. (In some cases, your limits may be configured lower than those below.)
For IQ Private Port, this limit is based on a per-BGP session limit and not an entire customer VRF limit. The total the prefix announcements originated by a customer could theoretically contain far more than 1000 entries at central locations.
CenturyLink’s provider edge (PE) routers will automatically drop the BGP session of a customer’s port if more BGP announcements than the prefix limit allows are received by that PE router. This has been more of a concern with IQ Private Port as opposed to IQ Internet Port, but could happen with either. CenturyLink does not have an automated warning system to alert customers of rising prefix counts; the BGP session is dropped without warning once the threshold is exceeded.
To avoid prefix-related BGP session drops, try one of the following solutions:
If you experience a prefix-related outage and cannot reduce your prefix announcements, please contact the CenturyLink IP TAC and request a temporary prefix increase until your account team can complete the formal prefix increase request process.