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400-007 · Question #83

Which statement about hot-potato routing architecture design is true?

The correct answer is A. Hot-potato routing is the preferred architecture when connecting to content providers. Hot-potato routing, where traffic exits a network at the earliest possible point, is the preferred BGP architecture when peering with content providers because it shifts transit burden off your network onto the peer's infrastructure.

Designing Network Infrastructure

Question

Which statement about hot-potato routing architecture design is true?

Options

  • AHot-potato routing is the preferred architecture when connecting to content providers
  • BHop-potato keeps traffic under the control of the network administrator for longer
  • COSPF uses hot-potato routing if all ASBRs use the same value for the external metric
  • DHot-potato routing is prone to misconfiguration as well as poor coordination between two

How the community answered

(22 responses)
  • A
    77% (17)
  • B
    5% (1)
  • C
    14% (3)
  • D
    5% (1)

Why each option

Hot-potato routing, where traffic exits a network at the earliest possible point, is the preferred BGP architecture when peering with content providers because it shifts transit burden off your network onto the peer's infrastructure.

AHot-potato routing is the preferred architecture when connecting to content providersCorrect

Hot-potato routing causes a network to forward traffic out via the closest BGP exit point, minimizing internal bandwidth consumption. Content providers favor this peering model because it delivers traffic to their well-provisioned network early, and the eyeball ISP benefits by offloading internal transit cost as quickly as possible.

BHop-potato keeps traffic under the control of the network administrator for longer

Keeping traffic under the network administrator's control for a longer path describes cold-potato routing, which is the opposite of hot-potato behavior.

COSPF uses hot-potato routing if all ASBRs use the same value for the external metric

When all ASBRs advertise the same external metric, OSPF selects the exit point based on the lowest internal IGP cost to the ASBR, which actually produces hot-potato behavior - but this statement incorrectly implies it is a special condition rather than describing the general mechanism.

DHot-potato routing is prone to misconfiguration as well as poor coordination between two

Susceptibility to misconfiguration and poor inter-AS coordination is a characteristic associated with complex policy routing or confederations, not a defining property of the hot-potato routing architecture itself.

Concept tested: BGP hot-potato vs cold-potato routing design

Source: https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13754-26.html

Topics

#hot-potato routing#BGP routing policy#inter-AS routing#traffic engineering

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