Which BGP attribute is used to detect routing loops?
Which BGP attribute is used to detect routing loops?
The AS path attribute in BGP is used to detect routing loops. It contains the sequence of Autonomous System (AS) numbers that the route has traversed. A BGP router examines the AS path for its own AS number; if found, it will reject the route to prevent loops. This mechanism ensures that a BGP router does not receive a route that it had previously advertised.
A. AS path AS path is a mandatory attribute in BGP that contains the sequence of AS numbers that the route has traversed. It helps prevent routing loops by ensuring that a BGP speaker does not accept a route that contains its own AS number in the AS path attribute. This prevents a BGP speaker from advertising a route back to the AS from which it learned the route, thereby avoiding routing loops in the BGP network.