What are the various BGP timers?

This Article explains about BGP timers like BGP keep-alive, hold-down, connect, advertisement-interval, BGP Table scan interval, Route-refresh timer and more. BGP is a exterior routing protocol which is used in ISP environment to exchange or advertise routes among ISP’s and enterprise.

What are the default BGP timers?

BGP on the local routing device uses the smaller of either the local hold-time value or the peer’s hold-time value as the hold time for the BGP connection between the two peers. The default hold-time is 90 seconds, meaning that the default frequency for keepalive messages is 30 seconds.

How do I set BGP timer?

To adjust BGP network timers, use the timers bgp router configuration command. To reset the BGP timing defaults, use the no form of this command. Frequency (in seconds) with which the Cisco IOS software sends keepalive messages to its peer. The default is 60 sec.

What is keepalive message in BGP?

Keepalive messages are exchanged every one-third of the Hold Timer agreed upon between the two BGP routers. Cisco devices have a default Hold Time of 180 seconds, so the default Keepalive interval is 60 seconds. If the Hold Time is set for zero, no Keepalive messages are sent between the BGP neighbors.

How does BGP keepalive work?

Do BGP timers have to match?

This message also carries hold time configured on the peer. The common myth is both BGP peer mush have matching hold time and keep alive timer for BGP neighbor relationship. It is not true! Another myth is BGP peer sends keep alive timer in open message, it is not true either!

Should I use keepalive?

The Benefits of Connection Keep Alive The HTTP keep-alive header maintains a connection between a client and your server, reducing the time needed to serve files. A persistent connection also reduces the number of TCP and SSL/TLS connection requests, leading to a drop in round trip time (RTT).

Should I use connection keep alive?

Conclusion. Enabling Keep-Alive is a great way to optimize your website as it helps improve speed and performance, ensuring faster load times and higher efficiency. By turning the Keep-Alive header on, the client and server can reuse a single TCP connection for a number of requests and responses.

What is keepalive timeout?

The keep alive timeout on the Message Processor allows a single TCP connection to send and receive multiple HTTP requests/responses from/to the backend server, instead of opening a new connection for every request/response pair.

How long does BGP take to failover?

The failover time for the default i-BGP peering session with the default value of the waiting interval is 5 seconds. The failure time on the primary link does not affect the secondary link and tertiary link.