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An external BGP neighbor (eBGP neighbor) is a neighbor that is in an AS other than the local router.iBGP neighbors do not have to be directly connected. An internal BGP neighbor (iBGP neighbor) is a neighbor that resides on the same AS as the local router.In BGP you are required to manually configure each neighbor in order to establish a neighborhood relationship. The default is hold-down time is 180 seconds. Hold Time: Interval in seconds, after which the neighbor will be considered unavailable.

Keepalive Interval: The time interval in seconds, between sending keep-alive messages.

By default, eBGP neighbors must be directly connected. IBGP works within the single AS and transfer BGP routes within a single autonomous system.ĮBGP:BGP running between autonomous systems. It results in a reset of the neighbor relationships. Notification: In BGP notifications are used to report BGP problems or errors.

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Update messages: These messages are used to exchanges Path Attributes and the associated prefix /length that use those attributes. If the Keep-alive messages are not received within a Hold timer then BGP neighbor-ship will be broken down. Keep-alive: These keepalive messages are sent periodically to keep the neighbor relationship. Open:Open message is Used to create a neighbor relationship and exchange BGP=parameters, including AS number and authentication values. Local Preference (highest local value will be preferred, default value is 100).Name a few well-known BGP metric attributes?īGP path selection depends on the values of the following attributes: For other routes, you will also have a default route. Partial updates: In the partial update configuration mode of BGP you will receive the routes for prefixes that are suitable to reach from your ISP router. This mode required a lot amount of memory.

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This is the most efficient way of configuration when you have a small amount of memory.įull updates: I n this mode of configuration you will receive the full routing table from ISP. You can configure the BGP protocol according to your memory and hardware requirements in the following ways:ĭefault route: In this mode of configuration ISP only advertises the default route with BGP, and all other routes are accessible through this default route. What are the different modes of configuration for BGP? BGP is a good option in transit autonomous systems, which means that you can allow your data packets to move through from one autonomous system to another autonomous system. You can establish a connection between different autonomous systems by BGP. Normally we use the BGP in a large ISP environment. Its hop count is an AS and that way it is also known as path vector protocol. What is the default administrative distance for BGP?įollowing are the default administrative distance for BGP routes:īGP is a protocol for ISPs and it is like a distance-vector protocol. The protocol metric is called path-vector or attributes.Periodically sends keepalive messages to verify TCP connections.

Sends updates only after network changes (no periodic updates).

Uses TCP to transfer data, this ensures reliable delivery of protocol updates (port 179).

This is a General BGP Interview Question most face in a networking job interview.īGP is a path-vector protocol with the following common characteristics: What do you know about BGP, explain some basic characteristics? BGP is considered as a path vector protocol & it routing metric is based on paths, network-policies sets by a network administrator. BGP may be used for routing within an AS and classified as IGP protocol while the other protocols may be referred to as Exterior Border Gateway Protocol. Since BGP operates with large amounts of data (the current size of the table for IPv4 is more than 450 thousand routes), the principles of its configuration and operation are different from the internal dynamic routing protocols (IGP). BGP is for large networks and is normally used for connecting different ISPs. What is BGP?īGP stands for Border Gateway Protocol and it is the main dynamic routing protocol used on the Internet. It will cover all concepts of BGP (Border Gateway Protocol). In this article, you will find the most important and most asked BGP Interview Questions For Experienced CCNA and CCNP Network Engineers. BGP Interview Questions For Experienced CCNA and CCNP Network Engineers

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