IPRAN grid-ring topologies - Problem statement for Fast IGP - - PowerPoint PPT Presentation

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Jan 22, 2023 198 likes •294 views

IPRAN grid-ring topologies - Problem statement for Fast IGP Convergence algorium Susan Hares drafu-hares-lsr-grid-ring-convergence What Makes some IPRAN Topologies unique A B C D 1 2 Not the Random styles of Dense mesh of GRID

SLIDE 1

IPRAN grid-ring topologies - Problem statement for Fast IGP Convergence algorium

Susan Hares drafu-hares-lsr-grid-ring-convergence

SLIDE 2

What Makes some IPRAN Topologies unique

A B C D 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 28 27 21 22 23 24 30 29 25 26 31 5 6

H L A B G I C D E F J M K N O

Rings connected to Two GRID nodes (ring-grid node) Random styles of GRID topologies

Hares - LSR - IPRAN topology + FAST IGP Convergence Flooding 2

Not the Dense mesh of Data center

SLIDE 3

Basic Unit of Grid

Hares - LSR - IPRAN topology + FAST IGP Convergence Flooding 3

Red most Connected node

SLIDE 4

Example 9X 12 Grid

Hares - LSR - IPRAN topology + FAST IGP Convergence Flooding 4

A B E G C H I F D A B E G C H I F D A B E G C H I F D A B E G C H I F D A B E G C H I F D A B E G C H I F D A B E G C H I F D A B E G C H I F D A B E G C H I F D A B E G C H I F D A B E G C H I F D A B E G C H I F D

SLIDE 5

Problems with IPRAN deployments

Ring with routers (usually Sonet) connect to

two Grid Routers – mobile RAN nodes hang ofg routers

GRID size varies (20 by 20 to 10K by 10K, >>)
Desire single IGP, but need fast convergence

(less than 200 ms a goal)

Rolling power outage in some deployments

where power grid has problems

Hares - LSR - IPRAN topology + FAST IGP Convergence Flooding 5

SLIDE 6

Desired in Fast IGP Technology

Zero-confjguratjon for Ring (self-

confjguratjon or template based)

Fast IGP

– Minimize convergence tjme under 200ms for fast IGP convergence algorithm. – Algorithm used only afuer initjal IGP converges – Fast Reroute must handle multjple failures (from rolling power outages/brownouts).

Hares - LSR - IPRAN topology + FAST IGP Convergence Flooding 6

SLIDE 7

Drafu Content + Next Steps

Drafu: contains convergence equatjons – to

provide theoretjcal background.

Next Steps: Can we evaluate the network

topology when considering the value of alternatjve FAST IGP algorithms?

Hares - LSR - IPRAN topology + FAST IGP Convergence Flooding 7

SLIDE 8

Questjons

Hares - LSR - IPRAN topology + FAST IGP Convergence Flooding 8