Functional Tests of MPLS and VPN on TWAREN

Department of Electrical Engineering Computer Networking LabNational Sun Yat-Sen University Prof. Tsang-Ling Sheu

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Functional Tests of MPLS and Functional Tests of MPLS and VPN on TWARENVPN on TWAREN

Tsang-Ling Sheu

Dept. of Electrical Engineering

National Sun Yat-Sen University

Kaohsiung, TAIWAN


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OutlineOutline

MPLS ArchitecturesFast ReroutingPreemption Load sharing Auto-bandwidth Multiple MPLS-VPN


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MPLS ArchitecturesMPLS Architectures

Multiple Protocols Label Switching– Integrate IP routing and ATM Label Switching

Route once and Switch many

– Establish LSP (Label Switching Path) from Ingress LSR to Egress LSR

via RSVP-TE , LDP, or CR-LDP

– Provide QoS via Queuing Disciplines (or DiffServ) WRR, DRR, Token Bucket

– Provide Traffic Engineering


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MPLS Networks

MPLS Networks

Diffserv MPLS

Networks

Core LSR Core LSR

Sender

Ingress LSR

Egress LSR

Receiver

Data IP

Data IP MPLS

Data IP MPLS

Data IP

Label EXP S TTL

20bits 3bits 1bit 8bits

MPLS Architectures


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Packet-to-FEC Mapping FEC-to-NHLFE Mapping

FEC-to-NHLFEMapping

Swap LabelAttach label Detach label

MPLS Domain

Label

NHLFE

NHLFE

NHLFE

Ingress LSR LSR Egress LSR

Label Switching Path (LSP)


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MPLS Traffic Engineering MPLS Traffic Engineering

Bandwidth Reservation

Traffic Rerouting

Path Preemption

Path Selection

QoS-based Forwarding


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Traffic Engineering


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TWAREN TopologyTWAREN Topology


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NotationNotationSymbol Notation

NSYSU National Sun Yat-Sen University

NCKU National Cheng-Kung University

NSYSU 7609R CISCO 7609 at NSYSU

NCKU 7609R CISCO 7609 at NCKU

TN 12416R CISCO 12416 at Tainan Gigapop

TC 12416R CISCO 12416 at Taichung Gigapop

HC 12416R CISCO 12416 at Hsinchu Gigapop

TP 12416R CISCO 12416 Taipei Gigapop


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Fast ReroutingFast Rerouting

NSYSU 7609R TN 12416R TP 12416RPacket Generator

TC 12416R

LSP 301

LSP 302

HC 12416R

LSP 300Traffic

Data Traffic

LSP

Traffic before Link Failure


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Fast Rerouting (Cont.)Fast Rerouting (Cont.)


TC 12416R

LSP 301

LSP 302

HC 12416R

LSP 300Traffic

Data Traffic

LSP

Traffic after recovery


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Packet DropPacket Drop Sending rate = 100 Mbps , 200 Mbps and 300 Mbps


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Recovery Time Recovery Time Sending rate = 100 Mbps , 200 Mbps and 300 Mbps


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Throughput Throughput Sending rate = 100 Mbps, 200 Mbps and 300 Mbps


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Packet DropPacket Drop Packet size =1000 Byte, Auto length, 64 byte. sending rate = 100 Mbps


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Recovery Time Recovery Time Packet size = 1000 Byte, Auto length, 64 byte. Sending rate = 100 Mbps


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Throughput Throughput Packet size = 1000 Byte, Auto length, 64 byte. Sending rate = 100 Mbps


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LSP Preemption LSP Preemption


LSP Tunnel 301 (Middle priority, 300Mbps)

HC 12416R

LSP Tunnel 300 (Low priority, 200Mbps)

550M

400M

Topology before Preemption


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LSP Preemption (Cont.)LSP Preemption (Cont.)


LSP Tunnel 301 (Middle priority, 300Mbps)

HC 12416R

LSP Tunnel 300 (Low priority, 200Mbps)

550M

400M

LSP Tunnel 302 (High priority, 500Mbps)

Topology after Preemption


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Preemption ResultsPreemption Results

Sending rate (Mbps) 100 200 300

Packet drop 49028 11376638 12683173

Recovery Time (sec) < 1 27 21

Packet Size = Auto Length

Recovery time from Preemption is not uniform. It may talk less then one second or more than 20 seconds.


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Load SharingLoad Sharing


HC 12416R

LSP Tunnel 421

LSP Tunnel 422


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Load Sharing via HashLoad Sharing via Hash Cisco router uses hash function to distribute traffic over the same subnet Three source-destination groups are tested individually.

(1) 192.168.60.51 --- > 192.168.111.21

192.168.50.53 --- > 192.168.111.21

(2) 192.168.50.52 --- > 192.168.111.21

192.168.60.51 --- > 192.168.111.21

(3) 192.168.50.53 --- > 192.168.111.21

192.168.60.53 --- > 192.168.111.21

192.168.50.0/24 and 192.168.60.0/24 are on NSYSU 7609R

192.168.111.21 is on Taipei Gigapop (TP 12416R).


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Experimental ResultsExperimental Results The first group uses different LSP Tunnels

(192.168.60.51 to 192.168.111.21: Tunnel 422

192.168.50.53 to 192.168.111.21: Tunnel 421)

The second group uses the same tunnel: Tunnel 422. The third group uses the same tunnel: Tunnel 421.

Load sharing is working, but because of hash function, it may need lots of source-destination pairs to be transmitted simultaneously.


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Auto-Bandwidth Auto-Bandwidth


HC 12416R

LSP Tunnel 311


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Experimental ResultsExperimental Results

Time (second)

Bandwidth (Kbps)

214second

521second

826second

150000Kbps160000Kbps

120000Kbps

190000KbpsTraffic Sending Bit Rate

300 second

600 second

900 second

1200 second

119994Kbps

157121Kbps

186872Kbps

190042Kbps

After Auto-Bandwidth


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Multiple MPLS-VPNMultiple MPLS-VPN

VPN uses BGP backbone– Redistribute Connected– Redistribute Static

VPN uses MPLS Tunnels


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BGP Backbone: Redistribute ConnectedBGP Backbone: Redistribute Connected

HC-12416(P)

TN-12416(P)

NSYSU-7609(PE)

Packet Generator

VPN A

NCU-7609(PE)

CCU-7609(PE) Linux Router (CE)

VPN A

VPN B

VPN B

G 9/12 : 192.168.120.120

eth1 : 192.168.120.1

eth1 : 192.168.34.2

G 9/16 : 192.168.34.1

Loopback 0 : 211.79.51.2

Loopback 0 : 211.79.58.2

192.168.120.0/24

192.168.34.0/24

192.168.33.0/24

192.168.36.0/24

Linux Router (CE)

Linux Router (CE)

Linux Router (CE)


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BGP Backbone: Redistribute StaticBGP Backbone: Redistribute Static

HC-12416(P)

TN-12416(P)

NSYSU-7609(PE)

Packet Generator

VPN A

NCU-7609(PE)

CCU-7609(PE) Linux Router (CE)

VPN A

VPN B

VPN B

G 9/12 : 192.168.120.120

eth1 : 192.168.120.1

eth1 : 192.168.34.2

G 9/16 : 192.168.34.1

Loopback 0 : 211.79.51.2

Loopback 0 : 211.79.58.2

192.168.120.0/24

192.168.34.0/24

211.73.67.0/26

211.73.67.64/26

VPN C

VPN C211.73.67.192/26

192.168.33.0/24

VPN C

192.168.36.0/24

Linux Router (CE)

Linux Router (CE)

Linux Router (CE)


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VPN uses MPLS TunnelsVPN uses MPLS Tunnels

HC-12416(P)

TN-12416(P)

NSYSU-7609(PE)

Packet Generator

VPN A

NCU-7609(PE)

CCU-7609(PE)

VPN A

VPN B

VPN B

Linux Router (CE)

G 9/12 : 192.168.120.120eth1 : 192.168.120.1

eth1 : 192.168.34.2

G 9/16 : 192.168.34.1

Loopback 0 : 211.79.51.2

Loopback 0 : 211.79.58.2

192.168.120.0/24

192.168.34.0/24

LSP_VPNA_1

LSP_VPNA_2

LSP_VPNB_2

LSP_VPNB_1

Linux Router (CE)

Linux Router (CE)

Linux Router (CE)


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ConclusionsConclusions MPLS is the selected switching technique for

backbone networks (it has been widely employed in USA)– Fast Rerouting, Path Preemption, and Load Sharing are

proved technologies – LSP tunneling facilitates the progress of MPLS-VPN

Bandwidth guarantee in MPLS relies on DiffServ technologies– Mapping problems still exist between 3-bit Exp field

and 6-bit DSCP field

Functional Tests of MPLS and VPN on TWAREN

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