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Juniper

JN0-102 · Question #253

What is the default export routing policy for EBGP?

The correct answer is A. Accept all active BGP routes. The default export policy for EBGP is to only advertise active BGP routes that were learned from other BGP peers.

Routing Policy and Firewall Filters

Question

What is the default export routing policy for EBGP?

Options

  • AAccept all active BGP routes.
  • BAccept all BGP routes.
  • CAccept no routes.
  • DAccept all active IGP routes.

How the community answered

(37 responses)
  • A
    86% (32)
  • B
    8% (3)
  • C
    3% (1)
  • D
    3% (1)

Why each option

The default export policy for EBGP is to only advertise active BGP routes that were learned from other BGP peers.

AAccept all active BGP routes.Correct

By default, an EBGP speaker will only advertise routes that it has learned from other BGP peers and that are marked as "active" in its routing table. This means it re-advertises BGP routes that it considers best and that have been installed in the forwarding table. It does not by default advertise routes learned via Interior Gateway Protocols (IGPs) or routes that are inactive.

BAccept all BGP routes.

EBGP does not accept *all* BGP routes for export by default; it only exports *active* BGP routes that it has selected as the best path.

CAccept no routes.

EBGP does not accept no routes by default; it does advertise its active BGP learned routes.

DAccept all active IGP routes.

EBGP does not by default accept all active IGP routes for export; these would need to be explicitly redistributed into BGP using a policy.

Concept tested: EBGP Default Export Policy

Source: https://www.juniper.net/documentation/us/en/software/junos/routing-policy/topics/topic-map/policy-routing-default-policy.html

Topics

#BGP#export policy#routing policies

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