(R)LFA и TI-FRR Матвей Александров системный инженер
[email protected]
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Содержание • LF LFA A (Loop-Fr (Loop-Free ee Alterna Alternative) tive) • RLFA (Remote LFA) • TI-FRR (Topology (Topology Independent Inde pendent Fast Re-Route)
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О чем речь? речь? • Попытаться реализовать MPLS FRR в IP/LDP сетях • Если в сети сети есть альтерна альтернативные тивные маршруты маршруты – почему бы их не ? посчитать заранее заранее?
• … и запрограммировать в PFE (!)
// магические 50 мс
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LFA LF A (Loop-Free Alternative) Alternative)
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Терминология • • • •
S – source (узел, (узел, вычисляющий топологию) D – destination (узел, который хотим достичь) E – primary next-hop сосед((и) N – сосед
S
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Link-protecting Link-pr otecting LF LFA A S
link-prote protecting cting LFA LFA для S, чтобы • Узел N: linkдостичь D
4
• Условие1 Условие1:: (N,D) < (N,S) + (S,D) • 5+5 5+5 < 5 + 4+5 4+5 выполняется • что ббуде удетт в случае случае метрики метрики 30 для линка линка E-N?
• Условие2 Условие2:: (N,D) < (N,E) + (E,D)
E
5
5 (30)
N
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Node-Link protecti protecting ng LFA
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Виртуальный стенд
warrior@vmx-71# run show version | match "Junos:" Junos: 17.3R1.10
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Топология_1:: link защита Топология_1
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Топология _1: nod nodee-lin link k защита
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Топология _1: nod nodee-lin link k защита + fallback
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Доступные критерии warrior@vmx-71# set routing-options backup-selection destination 7.0.0.74/32 interface ge-0/0/1.0 ? Possible completions: > admin-group
Administrative group policies for backup-selection
> backup-neighbor
Backup Neighbor ID based policies for backup selection
bandwidth-greater-eq ual-primary
Use backup nexthop only if bandwidth is >= bandwidth of primary nexthop
dest-metric
Destination metric
downstream-paths-onl y
Choose only the downstream nodes for backup
+ evaluation-order
Interface policy criteria evaluation order
+ metric-order
Metric evaluation order
> node
Node ID based policies for backup selection
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Remote LFA
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LFA неэффективен в кольцевых топологиях Link protection
5
Link protection
0
0.0/30
VMX-71 (S)
warrior@vmx-71# run show ospf backup coverage
5
1
0.12/30
Node Coverage:
1
1
VMX-21 (D)
VMX-31 (D)
2
2
5
0 8/30
0 20/30
Topology default coverage:
Area 0.0.0.0
5
Covered
Total
Percent
Nodes
Nodes
Covered
1
5
20.00%
// VMX-74, ECMP
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Remote LFA - теория
S Protected link
• (R1,R2,R3): extended P-space • узлы, которые S и его соседи (R1) (R1) могут достичь достич ь без испо использов льзования ания линка S-R5
• (R3,R4): Q-space
R1
R5
R2
R4
• узлы, которые могут достичь R5 без использования линка S-R5
R3:: PQ PQ-n -nod ode e • R3
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RLFA – RLFA – при пример мер (1) 5
VMX-71 (S)
0
0.0/30
5
1
0.12/30
warrior@vmx-71# show protocols ldp auto-targeted-session;
// включаем auto automati matic c sess sessions ions
track-igp-metric; interface ge-0/0/0.0;
1
1
VMX-21
VMX-31 (D)
2
2
interface ge-0/0/1.0; interface lo0.0; warrior@vmx-71# show protocols ospf backup-spf-options
5
0.8/30
tLDP
0.20/30
5
remote-backup-calculation;
// включаем RLFA
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RLFA – RLFA – при пример мер (2)
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RLFA – RLFA – при пример мер (3)
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RLFA – RLFA – при пример мер (4)
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RLFA – RLFA – при пример мер (5)
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RLFA – RLFA – при пример мер (6)
warrior@vmx-71# run show ospf backup coverage Node Coverage:
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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