Why does BGP attempt to establish connections over 30 seconds after the peer is configured

Compared with IGP configuration, BGP configuration is more complex. In addition to the peer and AS, the egress, multi-hop, timer, and various capabilities need to be specified. Currently, BGP does not support dynamic capability negotiation. Therefore, these parameters, after being modified, need to be renegotiated.

To avoid frequent interruptions during the renegotiation, a proper time parameter is required to ensure that the relevant configurations are complete before the link establishment attempt. RFC4271 recommends 120s, whereas 32s is adopted by switch.

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