Segment Routing - Traffic Engineering Flashcards
SR-TE uses a ________ to steer traffic through the network
policy
An SR-TE policy path is expressed as a ___________
List of segments
There are two types of SR-TE policies:
1 _________
2 _________
dynamic and explicit.
Quais nodes mantém estados no SR Te
Apenas o headend
Ambos SR TE e RSVP TE possuem suporte a ECMP
Falso
Ambos SR TE e RSVP TE foram Engineered for SDN
true
Quais entidades são responsáveis por determinar o caminho no SR TE ?
Node local ou headend / método distribuído
PCE / Método centralizado
Os caminhos são escolhidos baseados em :
__________
__________
metrics (cost, latency, bandwidth, and so on) and constraints (color, affinity, node, and so on).
Steering traffic onto SR-TE:
Who determines the policy: ____ or _____.
How is policy created: ___________
local or central
static, autoroute, BGP SR-TE dynamic
Because many SR-TE policies require a tunnel-te interface, the term “tunnel” is also used in the context of SR-TE
False:
Because many SR-TE policies do not require a tunnel-te interface, the term “tunnel” is avoided in the context of SR-TE
An ___________ is expressed as a SID list—the list of segments that specifies the path
SR-TE policy path
________ segment is a fundamental building block of SR-TE:
The ________ segment is a local segment identifying an SR-TE policy:
Each SR-TE policy is associated 1-for-1 with a ________ SID.
The ________ SID can be used to steer traffic into the SR-TE policy:
Binding
The ________ SID is a local label, statically or dynamically allocated for each SR-TE policy:
____________ SIDs can be manually configured if desired, per policy in some cases.
A ____________ SID can also be allocated for RSVP-TE tunnels (configurable).
The ____________-SID label is allocated when the SR-TE policy is instantiated.
Bringing down an SR-TE policy does not remove its ____________ SID.
Binding
The SR-TE policy interface tunnel-te down does not remove the binding SID. If SR-TE policy is deleted, binding SID is moved to the __________________ “zombie” table. It holds on to that label for about 30 minutes
Label Switching Database (LSD)
São constraints válidas:
Include and/or exclude traffic engineering affinity.
Include and/or exclude IP address.
Include and/or exclude SRLG.
Maximum accumulated metric (IGP, traffic engineering, and delay).
Maximum number of SIDs in the solution SID list.
true
SR-TE can be deployed using a centralized controller, it cannot be a router or a virtualized router
false:
It may be simply a conventional stateful path computation element (PCE) running on a physical or virtualized router.
Weighted ECMP SR Policy permite balancear tráfego por caminhos de custos desiguais controlando quando de tráfego pode ser enviado para cada caminho com base em suas capacidades
true
No SR TE qual mecanismo primário de traffic steering ?
Binding SID
______________ direciona automaticamente o tráfego para uma SR TE Policy a partir de marcações de communities color
O BGP SR TE Steering
