Leonardo Sambrana of Extreme Networks gave a presentation covering MPLS LSP load sharing, selective VLAN mapping to VPLS, and MPLS in an SDN environment. The presentation discussed how LSP load sharing improves traffic distribution over link aggregation groups. It also explained how selective VLAN mapping allows multiple VLANs to be mapped to a single VPLS service. Finally, it compared traditional MPLS deployments to an SDN-based approach using OpenDaylight and discussed using MPLS traffic engineering and L3 VPNs with SDN.

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Leonardo Sambrana
Sr. Systems Engineer – Extreme Networks
PTT Forum 8
LSP Load sharing / SDN

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Agenda
– MPLS LSP Loadsharing
– Selective VMAN into VPLS
– MPLS and SDN

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MPLS LSP Loadsharing

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Pseudo-wire (PW) Label Switch Path (LSP) Load Sharing provides the ability for L2VPN PWs to use
multiple Transport LSPs for carrying tunneled data across the MPLS network.
One of the primary drivers for this functionality is related to traffic distribution over Link Aggregation
Groups (LAG). Current HW hashing algorithms on MPLS Transit Nodes uses MPLS labels to derive a
hash value. While a L2VPN PW uses only 1 Transport LSP, there are only 2 MPLS labels to hash on
(Outer transport label, inner VC label) for a given PW. When a PW uses multiple Tunnel LSPs, there are
more labels for the HW to use for hashing, resulting in a significantly improved distribution over LAG in
MPLS Transit Nodes
MPLS LSP Loadsharing
Label 1 EXP
Bottom
= 0
TTL Label 2 EXP
Bottom
= 1
TTL

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MPLS LSP Loadsharing
Extreme Networks Confidential and Proprietary. Internal Use Only
ISP4
ISP1
1. Single VPLS PW (Pseudo-wire)
2. Multiple LSP’s for a single PW over a LAG group
3. Traffic is hashed based on the MPLS Shim Header Outer Label (LSP)
..... Inner Label Layer 3 HeaderOuter Label
LSP VC

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MPLS Traffic Distribution over LAG with LSP
Loadsharing
Single PW Muliple LSP’s
ISP1
ISP4

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Topologia
1
1
22
3
3 4
4
2
2
3 3
3.3.3.x/30 6.6.6.x/30
5.5.5.x/30
4.4.4.x/301.1.1.x/30
2.2.2.x/30
lo 20.20.20.20
lo 50.50.50.50
lo 40.40.40.40
lo 30.30.30.30
lo 10.10.10.10

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1
1
22
3
3 4
4
2
2
3 3
3.3.3.x/
30
6.6.6.x/
30
5.5.5.x/
30
4.4.4.x/
30
1.1.1.x/
30
2.2.2.x/
30
lo
20.20.20.20
lo
50.50.50.5
0
lo
40.40.40.40
lo
30.30.30.30

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1
1
22
3
3 4
4
2
2
3 3
3.3.3.
x/30
6.6.6.
x/30
5.5.5.
x/30
4.4.4.
x/30
1.1.1.
x/30
2.2.2.
x/30
lo
20.20.20.2
0
lo
50.50.50
.50
lo
40.40.40.
40
lo
30.30.30.
30

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Label 1 EXP
Bottom
= 0
TTL Label 2 EXP
Bottom
= 1
TTL

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Selective VMAN (VLAN) into VPLS

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Selective VMAN (VLAN) into VPLS
Selective VLAN mapping to VPLS provides the ability for multiple VLANs to be mapped to a single
VPLS service. This is achieved by assigning VMAN with CEP port as a service to VPLS.
VMAN is the VLAN stacking (a.k.a. Q-in-Q) feature. It has two types of ports: access and network. The
access port can be unaware or aware of VLAN. The customer edge port is the VLAN aware port of
VMAN. It is also known as selective Q-in-Q. The CEP allows plethora of configurable options.
- An Ethernet port can be associated with multiple VMANs based on the CVIDs.
- Multiple CVIDs on multiple Ethernet ports can be associated with a VMAN.
- A range of CVIDs can be specified instead of individually configured.
- CVID translations and egress filtering.

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Selective VMAN (VLAN) into VPLS
ISP 4
ISP 1
ISP 3
ISP 2
CEP Port
create vman vm1
configure vman vm1 add ports 3 cep cvid 10– 11
create vpls VSI1 fec-id-type pseudo-wire 35
configure vpls VSI1 add service vman vm1
configure vpls VSI1 add peer 1.2.3.2 core
VPLS Peer 1.2.3.2
VLAN 11
VLAN 12
VLAN 10
C-DA C-SA STAG CTAG DATA FCS

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Selective VMAN (VLAN) into VPLS
20
Port 1
Port 2
Port 3
VLAN A, B, D, E
VLAN B, C
VLAN A, E
VPLS 3 for VLAN E
VPLS 2 for VLAN D
VPLS 1 for VLAN A, B, C

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Exemplo de uso de Selective VMAN (VLAN)
SEM SELECTIVE VMAN (VLAN)
 VPLS por grupo de interese de
tráfego
 Pseudowires por VPLS:
– n(n-1)/2
 Pseudowire por switch/VPLs:
– n-1
 Para n=60, 20 VPLSs
– 1770 pseudowires por
VPLS
 Total = 35.400
pseudowires na rede
– 59 pseudowire por
switch/vpls
 Total = 59*20 = 1180
pseudowires por switch
21
VPLS
PE - Switch 1
PE - Switch 2
ISPa
ISPn
P
P
PE - Switch n
ISPb
ISPc
ISPd ISPe
VPLS

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Exemplo de uso de Selective VMAN (VLAN)
COM SELECTIVE VMAN (VLAN)
 Grupos de interesse de tráfego
utilizando VMAN única
 Pseudowires por VPLS:
– n(n-1)/2
 Pseudowire por switch/VPLs:
– n-1
 Para n=60, 1 VPLS
– 1770 pseudowires por VPLS
 Total = 1770 pseudowires na rede
– 59 pseudowires por switch
22
VPLS
VMAN
PE - Switch 1
PE - Switch 2
ISPa
ISPn
P
P
PE - Switch n
ISPb
ISPc
ISPd ISPe

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MPLS - SDN
23
MPLS - SDN

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Why MPLS?
24
MPLS Services
Why do Service Providers use MPLS?
MPLS VPN´s MPLS - TE
Motivation
High profitable
Flexibility
Resiliency / Redundancy
Transparency
Motivation
Deterministic Behavior
Efficient Resource
Utilization

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Traditional deployment
25

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OpenDaylight Helium
26

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SDN MPLS Deployment
27

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MPLS Traffic-Engineering
28

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MPLS L3-VPNs
29

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Referencias
30
- http://archive.openflow.org/wk/index.php/MPLS_with_OpenFlow/SDN
- Saurav Das, Unified Control Architecture for Packet and Circuit Network
Convergence, PhD Thesis, Stanford University,.
- Saurav Das, Ali Reza Sharafat, Guru Parulkar, Nick McKeown, MPLS with
a Simple OPEN Control Plane, invited talk at Packet Switching Symposium
at OFC/NFOEC'11, Los Angeles,.

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