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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
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