The most common reason for failing to establish either eBGP or iBGP neighbor relationships are due to misconfigurations. However, in addition to misconfigurations, the following factors can also prevent BGP adjacencies from establishing:
- Access Control Lists Filtering BGP Packets
- Layer 1 and Layer 2 Issues
- Device Resource Consumption
As with other routing protocols, ACLs can also prevent BGP neighbor adjacencies from being established. Given that BGP allows both internal and external peers to be more than one hop away, when configuring BGP between devices that are more than a single hop away . . .
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