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350-501 · Question #33

Refer to the exhibit. Based on the show command output, which result m true after BGP session is established?

The correct answer is C. No routes are accepted from the neighbor 192.168.2.2, nor are any routes advertised to it. Based on a show command output (not provided), if the router neither advertises nor accepts routes, it indicates that BGP policies or configuration prevent any route exchange.

Networking

Question

Refer to the exhibit. Based on the show command output, which result m true after BGP session is established?

Exhibit

350-501 question #33 exhibit

Options

  • AThe IOS XR router advertises all routes to the neighbor 192.168.2.2, but it does not accept any
  • BThe IOS XR router advertises and accepts all routes to and from eBGP neighbor 192.168.2.2
  • CNo routes are accepted from the neighbor 192.168.2.2, nor are any routes advertised to it
  • DThe IOS XR router does not advertise any routes to the neighbor 192.168.2.2,but it accepts all

How the community answered

(41 responses)
  • A
    5% (2)
  • B
    2% (1)
  • C
    93% (38)

Why each option

Based on a `show` command output (not provided), if the router neither advertises nor accepts routes, it indicates that BGP policies or configuration prevent any route exchange.

AThe IOS XR router advertises all routes to the neighbor 192.168.2.2, but it does not accept any

This scenario describes a one-way communication, where routes are advertised but not accepted, which is different from a complete lack of exchange.

BThe IOS XR router advertises and accepts all routes to and from eBGP neighbor 192.168.2.2

This scenario describes full route exchange, which contradicts the correct answer's implication of no exchange.

CNo routes are accepted from the neighbor 192.168.2.2, nor are any routes advertised to itCorrect

This outcome typically results from an applied BGP policy, such as an inbound or outbound route-map or access-list, that explicitly denies all routes for the specified neighbor, or from the BGP session being in a state where route exchange is prevented (e.g., neighbor not activated).

DThe IOS XR router does not advertise any routes to the neighbor 192.168.2.2,but it accepts all

This scenario describes a one-way communication, where routes are accepted but not advertised, which is different from a complete lack of exchange.

Concept tested: BGP route exchange policies

Source: https://www.cisco.com/c/en/us/td/docs/iosxr/asr9000/routing/611/b-routing-611-asr9k-cg/b-routing-611-asr9k-cg_chapter_0100.html

Topics

#BGP#Route Filtering#Route Advertisement#Neighbor Relationship

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