![]() ![]() If the session is not up state, it can vary between IDLE and ACTIVE (depends on the Finite State Machine process).If a BGP session is down and does not come up, issue the show ip bgp all summary command. Here you can find the current status of the session: Use this topology diagram as a reference for the outputs provided in this document. Keep in mind that all possible variables and scenarios cannot be considered and a deeper analysis could be required by Cisco TAC. This document describes a basic guide to troubleshoot the most common issues in Border Gateway Protocol (BGP), gives corrective actions, useful commands/debugs to detect the root cause of the problems, and best practices to avoid potential issues. If your network is live, ensure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. This document is not restricted to specific software and hardware versions, but commands are applicable for Cisco IOSĀ® and Cisco IOSĀ® XE. Basic BGP protocol knowledge is useful, you can refer to the BGP Configuration Guide for more information. There are no specific prerequisites for this document. ![]() This document describes how to troubleshoot the most common issues with the Border Gateway Protocol (BGP) and provides basic solutions and guidelines. ![]()
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