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Topology Discovery Correlating different network topology layers in heterogeneous environments Diederik Vandevenne Dennis Pellikaan February 8, 2013 Diederik Vandevenne, Dennis Pellikaan Topology Discovery February 8, 2013 1 / 13

SLIDE 1

Topology Discovery

Correlating different network topology layers in heterogeneous environments Diederik Vandevenne Dennis Pellikaan February 8, 2013

Diederik Vandevenne, Dennis Pellikaan Topology Discovery February 8, 2013 1 / 13

SLIDE 2

Introduction

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SLIDE 3

Research question

What are the challenges with the correlation of physical topology information based on LLDP and logical topology information? Working hypotheses LLDP is mature enough and widely implemented, which makes it a useful protocol for topology discovery in heterogeneous network environments All information needed to correlate the different network topology layers is available in the Management Information Base

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SLIDE 4

Link Layer Discovery Protocol

LLDP Data Unit Chassis ID Port ID Time to Live Optional fields End of LLDPDU Operation modes

Send only Receive only Send and receive

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SLIDE 5

Topology based on LLDP

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SLIDE 6

Ethernet with STP

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SLIDE 7

VLANs

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SLIDE 8

IP

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SLIDE 9

Complete Topology

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SLIDE 10

Implementation

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SLIDE 11

Findings

Maturity of LLDP at SURFsara

124 devices 83% supports LLDP 9% does not support LLDP 8% unknown

NOT all relevant information for topology discovery can be retrieved from standardized management information base objects

Not all standardized MIB objects are supported by all vendors Some information can only be retrieved from proprietary MIB objects

Device IDs (ChassisID, IP address) must be unique Layer two path finding might be needed to create a correct IP layer topology

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SLIDE 12

Conclussions Challenges of topology discovery

LLDP is mature enough and widely implemented, which makes it a useful protocol for topology dis- covery purposes in heterogeneous network environ- ments All information needed to correlate the different network topology layers is available in the man- agement information base

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SLIDE 13

Questions?

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