VLAN [Compatibility Mode]
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Transcript of VLAN [Compatibility Mode]
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VLAN
Suman Pandey
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References D. Passmore, and J. Freeman, The Virtual
LAN Technology Report,http://www.3com.com/nsc/200374.html, March,1997
IEEE 802.1Q, IEEE Standard for Local and
Metropolitan Area Networks: Virtual BridgeLocal Area Networks, 1998 Meng Guo , Subrata Mazumdar , Discovery of
Spanning Trees in Virtual Bridged LAN , The
Quarterly Newsletter of SNMP Technology,Comment, and Events, Volume 9, Number 1,December, 2001
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Outline General Concepts of VLAN
What is VLAN ? Why use VLAN's? Different way to assign VLAN Membership. S annin Tree in VLAN
Frame processing and 802.1Q standard Different kind of logical VLAN architecture
Implementation Details of VLAN for TopologyDiscovery Different Vendor specific Solutions SPECTRUM VLAN manager implementation MIB used
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General Concepts of VLAN
Paper: The Virtual LANTechnology Report
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What is VLAN ? vendor-specific solution
and strategy, so definingit is an issue.
VLAN's allow a networkmanager to logically
segmen a n odifferent broadcastdomains.
multiple physical LAN
segments independent ofphysical location and cancommunicate as if theywere on a common LAN
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Why use VLAN's?
Performance
Formation of Virtual Workgroups
Simplified Administration
Reduced Cost Security
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VLAN Membership Membership by Port
Membership by MACAddress
M m r hi IP
port vlan
1 12 1
3 2
Subnet Address
disadvantage of thismethod is that itdoes not allow foruser mobility.
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VLAN Membership Membership by Port
Membership by MACAddress
M m r hi IP n
MAC Address vlan
1212354145121 1
2389234873743 1
3045834758445 2
Address 5483573475843 1
Advantage :
no reconfiguration needed
Disadvantage : VLAN membership must be
assigned initially.
performance degradation asmembers of different VLANs coexist
on a single switch port
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VLAN Membership Membership by Port
Membership by MACAddress
M m r hi IP
IP Subnet vlan
23.2.24 126.21.35 2
Subnet Address Advantage: Good for application-based VLAN
strategy
User can move workstations
eliminate the need for frame tagging
Disadvantage :
Performance/ looking for L3 address inpacket.
Less effective with protocols such asIPX, DECnet, or AppleTalk
unroutable protocols such as NetBIOS
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Frame Processing in VLAN envRole of Bridges
bridge on receiving data determines to whichVLAN the data belongs either by implicit orexplicit tagging [802.1Q].
e r ge a so eeps rac o mem ersin a filtering database which it uses to determinewhere the data is to be sent
all the bridges in the VLAN should contain thesame information in their respective filteringdatabases
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Active Topology of Network withBridges
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Tagging [802.1Q]
Ethernet Frame Tag Header:
Token Ring and Fiber Distributed Data
n er ace ag ea er:
TCI
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VLAN architecture going forwardInfrastructural VLAN Service-Based VLAN
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Other Details of the Report DHCP with VLAN
ATM with VLAN
VLAN Migration Strategy
Automatic configuration of VLAN
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Implementation Details of
VLAN for To olo Discover
Paper: Discovery of SpanningTrees in Virtual Bridged LAN
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Different Vendor specific Solutions Avaya's VLANMaster application - only works with
Avayas Cajun switches.
Aprisma's SPECTRUM VLAN Manager It uses theCabletron Discovery Protocol (CDP) to find all CDPcompatible 802.1Q switches in a domain
Cisco's VlanDirector uses Cisco Discovery Protocol(CDP) VlanDirector cannot manage any devices that donot run CDP.
3COM's Enterprise VLAN Manager
Granite open source C API/SDK to provision VLANconfigurations using SNMP for Riverstone products.
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MIB InformationMIB used
RFC1213-MIB BRIDGE-MIB (RFC 1493)
Q-BRIDGE-MIB (RFC 2674).
dot1dStpPort
dot1qPvid
dot1dStpPortState
dot1dStpPortDesignatedRoot dot1dStpPortDesignatedBridge
dot1dStpPortDesignatedPort
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Discovery of Spanning Trees and
VLANs
Steps Deduce the target Virtual Bridged LAN from an arbitrary
IP address in the Virtual Bridged LAN
Automaticall discover all the brid es in the tar et Virtual
Bridged LAN Collect spanning tree and VLAN related MIB variables
from the discovered brides using SNMP
Construct the spanning trees in the Virtual Bridged LAN
and associate the spanning trees with VLANs.
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Implementation Detail
They have used Avaya's
Cajun switches, and the STPis stored in PROMINET-MIB
Collecting Spanning Tree RelatedInformation
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Implementation Detail
Construction of Per-VLANSpanning Tree Spanning Tree of VLAN 12
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