400-007 · Question #402
Refer to the exhibit. A customer needs to implement a connectivity model by using one active link for inbound and outbound traffic and a second link for backup. The backup link is low speed and is…
The correct answer is B. Advertise a longer AS PATH to ISP 2. Increase the MED to ISP 2. To implement a primary and backup link design, a common approach is to manipulate BGP attributes such as AS PATH and MED (Multi-Exit Discriminator). By advertising a longer AS PATH to ISP 2, the primary link (ISP 1) is preferred due to its shorter AS PATH. Increasing the MED to…
Question
Refer to the exhibit. A customer needs to implement a connectivity model by using one active link for inbound and outbound traffic and a second link for backup. The backup link is low speed and is required only during outages of the primary link. Which design solution should be implemented?
Exhibit
Options
- AAdvertise a higher local preference to ISP 2. Increase the AS PATH inbound from ISP 1.
- BAdvertise a longer AS PATH to ISP 2. Increase the MED to ISP 2.
- CAdvertise more specific routes to ISP 1. Increase the local preference attribute of inbound BGP
- DAdvertise less specific routes to ISP 2. Increase the AS PATH inbound from ISP 1.
How the community answered
(37 responses)- A24% (9)
- B62% (23)
- C8% (3)
- D5% (2)
Explanation
To implement a primary and backup link design, a common approach is to manipulate BGP attributes such as AS PATH and MED (Multi-Exit Discriminator). By advertising a longer AS PATH to ISP 2, the primary link (ISP 1) is preferred due to its shorter AS PATH. Increasing the MED to ISP 2 also helps in making it less preferred unless the primary link fails, thereby making ISP 2 the backup link.
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