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Apricot2001 Effectiveness of VLAN Chan Wai Kok ([email protected]) Faculty of Information Technology Salim Beg ([email protected]) Faculty of Engineering Multimedia University. The benefit of VLAN. Simplify the process of add, moves and changes

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Apricot2001Effectiveness of VLAN Chan Wai Kok ([email protected])Faculty of Information TechnologySalim Beg ([email protected]) Faculty of EngineeringMultimedia University


The benefit of vlan
The benefit of VLAN

  • Simplify the process of add, moves and changes

  • Provide broadcast, multicast traffic isolation by grouping similar traffic types to a VLAN.

  • Provide some form of security


Goals of this presentation
Goals of this presentation

  • To find out the broadcast traffic trend

  • To study the effectiveness of VLAN in broadcast isolation


Why broadcast isolation is important
Why Broadcast isolation is important ?

  • On a 1 Gbps capacity backbone network

  • If 1% traffic is (broadcast + multicast + unknown unicast), all end stations with 10Mbps link may be congested (but backbone have more capacity!!!)

  • Broadcast frames will take up CPU resources. E.g On Pentium 120Mhz,

    • 1000 broadcast pps :- 15 % CPU resource

    • 3000 broadcast pps :- 28 % CPU resource


Related work will e leland daniel v wilson bellcore 1989 1990
Related Work(Will E. Leland & Daniel V Wilson Bellcore 1989 - 1990)

  • collected LAN traffic data for long time scale and analyzed the trend

  • Their showed that there is a great disparity in the values of peak to mean ratio for packet arrival rate. (73 to 861 for 5 sec to 5 milisec respectively)

  • LAN traffic is Bursty

  • Focus on behavior of total Ethernet traffic






Analysis method
Analysis Method

  • Collect network traffic from few different IP Subnet and check the broadcast plus multicast traffic quantity.

  • Run an IP Multicast application

  • See how it’s effect the broadcast plus multicast traffic in the IP subnet.

  • Make some conclusions on the result


Network setup
Network Setup

  • A Pentium PC is used as a network analyzer

  • Traces are taken for a few days

  • Network consists of WinNT servers and Win95 PCs.

  • Each IP subnet consists of 60, 85 and 45 hosts respectively. 3 different labs.

  • Two Labs are is fully used during office hour.

  • Students accessing WinNT server to work

  • No Novell Server (future is IP)


Type of packets detected
Type of Packets Detected

  • ARP request

  • Spanning Tree Frame (hello frame)

  • Netbios

  • SAP

  • IP Multicast Solicitation


Traffic statistic
Traffic statistic

  • Average bandwidth (extremely low)

    • 1413, 1761, 1381 bps (office hour)

    • 809, 789, 406 bps (non office hour)

  • Maximum bandwidth (1 % of 10Mbps)

    • 31920, 125408, 130752 bps (office hour)

    • 29824, 70640, 38608 bps (non office hour)

  • Majority of the traffic is background traffic

  • Generally, broadcast traffic is very low





Traffic statistic with ip multicast application
Traffic Statistic with IP Multicast application

  • One IP Multicast Channel sending audio and text.

  • Average bandwidth :- 112 Kbps

  • Maximum Bandwidth :- 155 Kbps

  • Dramatic increased of (broadcast plus multicast) bandwidth when IP Multicast is ran.

  • Traffic isolation will required IP Multicast VLAN



Ip multicast vlan
IP Multicast VLAN

  • Router will duplicate IP Multicast packet to all IP Subnet that joined in IP Multicast group

  • Some switch ports have multiple IP Subnet VLAN memberships. Therefore, may receive in duplicated IP Multicast packet

  • IP Multicast VLAN is patented by 3com US Patent No: 5,818,838

  • Term as IGMP spoofing

  • Dynamic filtering of IP Multicast group at switch port level.

  • Available in many commercial switches.


Ip multicast application
IP Multicast Application

  • Who is running IP Multicast at the 1st place ?

  • A 4.5 year studies on MBone traffic shows

  • 90% of users joined multicast group less than 74 times

  • top 1% joined MBone group > 350 times

  • 20% IP addresses - at least 1 hour per connection

  • 70% IP addresses :- average 1 min per connection


Ip multicast application1
IP Multicast Application

  • Over 4.5 year

  • 20% of users joined MBone more than 1 day

  • 5% of users joined > 300 hours

  • A total of 33,545 unique IP is seen in 4.5 year

  • Jan 1998 :- 10,600 unique IP seen

  • ( > 20,000 IP didn’t joined any multicast session for more than 1 year)

  • Jan 1999 :- 5,000 unique IP seen


Conclusion
Conclusion

  • When no IP Multicast application

  • Total Broadcast and multicast traffic is very low

  • problem of broadcast isolation does not arise at the first place

  • VLAN is of little use


Conclusion1
Conclusion

  • When IP Multicast is deployed

  • Dramatic increase in mean bandwidth

  • VLAN is useful only when IP Multicast application is deployed

  • Make sure that current/future switch support IP Multicast VLAN

  • However, IP Multicast application is still not popular yet.

  • Studies have shown MBone is growing slowly and it uses is not widespread.


References
References

  • http://imj.ucsb.edu/publications.html

    • BGPK. Almeroth, "A Long-Term Analysis of Growth and Usage Patterns in the Multicast Backbone (MBone)", IEEE INFOCOM '00, Tel Aviv, ISRAEL, March 2000

  • http://www.patents.ibm.com

  • http://www.argreenhouse.com/papers/wel/

    • Will E. Leland, Daniel V. Wilson, “High Time-resolution Measurement and Analysis of LAN Traffic: Implications for LAN Interconnection,” Proceedings IEEE Infocom 1991, Bal Harbour, Florida, April 1991, pp.1360-1366. building and forwarding


Question
Question ??

Question can be forwarded to

[email protected]


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