Viola L2 Services and Tests

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Viola L2 Services and Tests

• Author
• Wilfried Maas T-Systems Technology Center
  Darmstadt

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L2 Services in Viola VPWS/VPLSneeded protocols

• Link State based IGP
• OSPF
• or IS-IS
• MPLS Transport Tunnel
• RSVP-TE
• or LDP
• Full mesh of all PE devicescould be used for
  multiple Services
• L2-Services
• Martini Tunnel

PE
P
PE
PE
Line MPLS-Transport- Tunnel PE Provider
Edge (with Services) P Provider Router (no
Services)

• Viola
• IGP ? OSPF
• Transport Tunnel ? MPLS-RSVP-TE
• Systems used in Viola
• Alcatel 7750
• Riverstone XGS 15000

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L2 Services in ViolaVPWS Virtual Private Wire
Service
Pseudowire
Physical Line
Transport- tunnel
Point to point connectionsAll Ethernet packets
are transported from the ingress interface to
egress interface
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L2 Services in ViolaVPWS Virtual Private Wire
Service
VLAN 200
VLAN 100
Variant B VLAN Ports(Subinterfaces)
any VLAN (e.g. 100) untagged frames
any VLAN (e.g. 100) untagged frames
Variant A VLAN transparent
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Viola VPWS Interworking Riverstone 15008
Alcatel 7750SR
These results are as well valid for the VPLS
Service.
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L2 Services in ViolaVPLS Virtual private LAN
Service
VPLS
VPLS
VPLS
VPLS
VPLS
VPLS
VPLS
PE
VPLS
PE
VPLS
VPLS
VPLS
PE
VPLS
VPLS

• Multipoint to multipoint connectivity
• Ethernet switched service per VPLS instance
• MAC learning (per VPLS)
• All PEs must be fully meshed by pseudo wires,
  once per VPLS instance
• ? N2 problem
• Port definition (VLAN/no VLAN) like VPWS Service

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VPLS Service with H-VPLS
VPLS
VPLS
VPLS

• H-VPLS can break the full mesh requirement of
  VPLS
• N2 Problem can be solved
• Ethernet loop avoidance must be considered to
  prevent circulating packets
• Ethernet spanning tree mechanism or similar is
  needed if the H-VPLS connection should be
  redundant.

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Viola L2 Network VPLS Full Mesh in the Core
15008 Caesar
15008 Bonn
7750 Bonn
VPLS Full-Mesh
7750 St. Augustin
7750 Jülich
15008 Jülich
15008 St. Augustin
15008 FH Bonn
15008 A2 St. Augustin
VPLS
H-VPLS Spoke
VPLS Core Riverstone
VPLS Core Alcatel
H-VPLS Spoke Riverstone
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Theoretical usage of H-VPLS in VIOLA
Connectivity of Sub networks with H-VPLS Spokes
15008 Caesar
Spanning Tree necessary
7750 Bonn
15008 Bonn
H-VPLSSpoke
VPLS Full-Mesh
VPLS Full-Mesh
7750 St. Augustin
7750 Jülich
15008 Jülich
15008 St. Augustin
15008 FH Bonn
VPLS
15008 A2 St. Augustin
H-VPLS Spoke
H-VPLS could reduce the required quantity of
pseudo wires.
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H-VPLS Test Alcatel and RiverstoneRedundancy
with Link Aggregation
PE St. Augustin2
PE Bonn
Spoke on LAG2 x Gigabit Ethernet
PE St. Augustin
PE Jülich
Link Aggregation was successfully tested on
Alcatel and Riverstone systems. The outage time
on failure of single link was about 100 ms.
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H-VPLS Test Alcatel Redundant Dual-Home
Connection
Alcatel proprietary solution !
1 Management VPLS could be used to protect
multiple VPLS instances.
Spoke standby link
7750 St. Augustin2
7750 Bonn
Management VPLS spanning tree
Spoke active link
protected by Management VPLS
7750 St. Augustin
7750 Jülich
With 2 Management VPLSs instances and a split
setting of primary paths between the VPLS
instances a load sharing could be implemented.
VPLS
H-VPLS Spoke
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H-VPLS Test Alcatel Redundant Dual-Home
Connection
Alcatel proprietary solution !
7750 Bonn
7750 St. Augustin2
Metro 2
Spoke SDPs between Metros, Redundancy achieved
with RSTP and M-VPLS
Management VPLS
7750 Jülich
7750 St. Augustin
Metro 1
VPLS
H-VPLS Spoke
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H-VPLS Test RiverstoneRedundant Dual-Home
Connection for MTUs
Riverstone proprietary solution !

• Standby connection is only defined at the MTU
• Traffic at the standby link is blocked at the MTU
  (if the active link is up)
• Redundancy scenario works only in this (triangle)
  topology

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Thank you for your attention !
Wilfried Maas SSC ENPS 64295 Darmstadt /
Germany Email wilfried.maas_at_t-systems.com