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400-007 · Question #55

A network architect must redesign a service provider edge, where multiservice and multitenant PEs are currently present. Which design feature should be minimized in the new design to achieve…

The correct answer is B. fate sharing. Fate sharing means multiple tenants or services share the same failure domain, so a single device failure impacts all co-located services simultaneously, reducing reliability in a multitenant SP edge.

Designing Network Infrastructure

Question

A network architect must redesign a service provider edge, where multiservice and multitenant PEs are currently present. Which design feature should be minimized in the new design to achieve reliability?

Options

  • Abridging
  • Bfate sharing
  • Credundancy
  • Dunicast overlay routing

How the community answered

(39 responses)
  • A
    3% (1)
  • B
    79% (31)
  • C
    13% (5)
  • D
    5% (2)

Why each option

Fate sharing means multiple tenants or services share the same failure domain, so a single device failure impacts all co-located services simultaneously, reducing reliability in a multitenant SP edge.

Abridging

Bridging may introduce complexity and broadcast domain issues but is a specific service capability rather than the primary reliability risk in a multitenant PE redesign.

Bfate sharingCorrect

In a multiservice, multitenant PE environment, fate sharing occurs when diverse customers and services are consolidated onto the same physical device; a software crash, hardware failure, or misconfiguration on that PE disrupts all tenants at once. Minimizing fate sharing - by separating tenants or services across independent failure domains - ensures that a failure in one domain does not propagate to others, directly improving reliability and availability for all customers.

Credundancy

Redundancy is a core reliability mechanism and should be maximized, not minimized, in a service provider edge design.

Dunicast overlay routing

Unicast overlay routing such as MPLS L3VPN is the foundational technology enabling multitenant separation and scalable PE design and should not be minimized.

Concept tested: Fate sharing minimization in SP edge design

Source: https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/MPLS_High_Avail/MPLSHighAvail.html

Topics

#fate sharing#service provider edge#reliability#multiservice PE

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