This article will help to understand BGP notification message which is received due to number of prefixes advertised on the BGP session exceeds the configured maximum limit.

The BGP session will go down if peer device is configured with "prefix-limit teardown" knob.

We will receive below BGP notification message in log message file:

<Timestamp> <hostname> rpd[18270]: bgp_handle_notify:4464: NOTIFICATION received from xx.xx.xx.xx (External AS xxxx): code 6 (Cease) subcode 9 (Hard Reset) [code 6 (Cease) subcode 1 (Maximum Number of Prefixes Reached)] AFI: 1 SAFI: 1 prefix limit <number>

The problem is number of prefixes advertised is more than the prefix-limit configured on the peer device. We can have two solution depending on the scenario:

1) Reduce the number of advertised prefixes.

2) Increase the prefix-limit to larger number to accommodate all the advertise prefixed.