Juniper Enterprise Routing and Switching - Professional (JNCIP-ENT) JN0-650 Question # 6 Topic 1 Discussion
JN0-650 Exam Topic 1 Question 6 Discussion:
Question #: 6
Topic #: 1
An incorrectly configured routing policy at your service provider led to several hundred thousand routes being placed in your edge router ' s routing table In this scenario, how would you limit the number of prefixes received on a BGP peer session?
A.
Enable the damping BGP parameter in the edge router configuration
B.
Enable the prefix-limit BGP parameter in the edge router configuration.
C.
Enable the graceful-restart BGP parameter in the edge router configuration.
D.
Enable the advertise-inactive BGP parameter in the edge router configuration.
When a peer incorrectly floods your router with an excessive number of routes, it can exhaust system resources and crash the routing engine.
Prefix-Limit (Option B): The prefix-limit (or accepted-prefix-limit) parameter is the primary defense against such " route leaks " .
You can set a maximum threshold for the number of prefixes allowed from a specific BGP neighbor or group.
When the limit is reached, Junos can be configured to either just log a warning or tear down the BGP session entirely (using the teardown keyword) to protect the router.
This prevents the " hundreds of thousand routes " from ever being fully processed or installed into the main routing table.
Damping (Option A): Damping is used to suppress unstable, " flapping " routes, but it does not limit the total volume of stable routes received.
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