Why use Quagga Anyway? - 4-8 May 2009€¦ · Thanks for listening! That's all folks.....any...

Why use Quagga Anyway?

Nick Hilliard

[email protected]

mailto:[email protected]

mailto:[email protected]

Copyright © INEX 2009All Rights Reserved

IXP Fabric

Single-RIB BGP policy problem

Single RIB

Route Server

A

X

B

D

C

Y


IXP Fabric


Single RIB

Route Server

A

X

B

D

C

Y

ABCD route server clients


IXP Fabric


Single RIB

Route Server

A

X

B

D

C

Y


X reaches IXP via transit A and B


IXP Fabric


Single RIB

Route Server

A

X

B

D

C

Y



AYX longer than BX


IXP Fabric


Single RIB

Route Server

A

X

B

D

RS calculates best path as BX

C

Y



AYX longer than BX


IXP Fabric


Single RIB

Route Server

A

X

B

D


C

YB does not peer

with D (tag 0:D)



AYX longer than BX


IXP Fabric


Single RIB

Route Server

A

X

B

D


C

YB does not peer

with D (tag 0:D)

D should see XYA path



AYX longer than BX


IXP Fabric


Single RIB

Route Server

A

X

B

D


C

YB does not peer

with D (tag 0:D)


RS RIB has only one best path - BX



AYX longer than BX


IXP Fabric


Single RIB

Route Server

A

X

B

D


C

YB does not peer

with D (tag 0:D)


RS RIB has only one best path - BX



AYX longer than BXD does not see X


How Per-Client Loc-RIBs Work

Multi-RIB

RouteServer

A

X

B D

C

Y

Loc-RIB A

Loc-RIB B

Loc-RIB D

Loc-RIB C

export

import



Multi-RIB

RouteServer

A

X

B D

C

Y


Loc-RIB A

Loc-RIB B

Loc-RIB D

Loc-RIB C

export

import



Multi-RIB

RouteServer

A

X

B D

C

Y



Loc-RIB A

Loc-RIB B

Loc-RIB D

Loc-RIB C

export

import



Multi-RIB

RouteServer

A

X

B D

C

Y



AYX longer than BX

Loc-RIB A

Loc-RIB B

Loc-RIB D

Loc-RIB C

export

import



Multi-RIB

RouteServer

A

X

B D

C

Y



AYX longer than BX

Loc-RIB A

Loc-RIB B

Loc-RIB D

Loc-RIB C

export

import

import rule filters on tag



Multi-RIB

RouteServer

A

X

B D

C

Y



AYX longer than BX

Loc-RIB A

Loc-RIB B

Loc-RIB D

Loc-RIB C

export

import


RIB C sees BX and AYX



Multi-RIB

RouteServer

A

X

B D

C

Y



AYX longer than BX

Loc-RIB A

Loc-RIB B

Loc-RIB D

Loc-RIB C

export

import



RIB D only sees AYX



Multi-RIB

RouteServer

A

X

B D

C

Y



AYX longer than BX

Loc-RIB A

Loc-RIB B

Loc-RIB D

Loc-RIB C

export

import



RIB D only sees AYX

RIB C selects BX

BX



Multi-RIB

RouteServer

A

X

B D

C

Y



AYX longer than BX

Loc-RIB A

Loc-RIB B

Loc-RIB D

Loc-RIB C

export

import



RIB D only sees AYX

RIB C selects BXRIB D selects AYX

BX

AYX


Multiple Loc-RIBs also mean:Memory consumption and CPU usage go from O(P) to:

... where N = number of clients, P = number of prefixes

Add a little if “soft-reconfiguration inbound” used

Quagga is single-threadedmultiple cores won’t help you for CPUbut 64 bit images might for memory

you can now run separate daemons for IPv4 and IPv6

All this is fine if you’re a small IXPNot so good if you have lots of prefixes and route-server clients.

Problems with Multiple Loc-RIBs

Thanks for listening!

That's all folks...

...any questions?

Why use Quagga Anyway? - 4-8 May 2009€¦ · Thanks for listening! That's all folks.....any...

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