History of VPLS at IETF

1
History of VPLS at IETF

• Ali Sajassi
• November 12, 2002

2
VPLS Virtual Private LAN Services

• Providing a bridged LAN service among different
  CEs/sites of each customer
• End-to-end service is an (Emulated) Bridged LAN
  service (Bridging Emulated LAN)
• Dividing it such that IETF takes care of
  Emulated LAN portion of it and IEEE takes care
  of Bridging portion of it

3
VPLS System

VPLS
-
A

VPLS
-
B


PE
CE
-
1


CE
-
2

PE
Service Provider
Backbone

VPLS
-
B

CE
-
1



PE
Emulated LAN
VPLS
-
A

Bridged LAN
CE
-
2

4
VPLS System w/ Distributed-PE

VPLS
-
A

VPLS
-
A

U-PE
CE
-
1

CE
-
2

PE

N-PE

VPLS
-
B

Service Provider
VPLS
-
B

Backbone

CE
-
2

Access
Network

CE
-
1

PE


U-PE
VPLS
-
B

VPLS
-
A

CE
-
3

VPLS
-
B

CE
-
2

CE
-
4

5
VPLS Components

• Logical Components for a VPLS Reference
  Architecture
• Attachment VCs
• Pseudo Wires
• PSN Tunnels
• Auto Discovery
• Auto Configuration
• Virtual Switch Instance

6
VPLS System An Example
7
VPLS Evolution

• Got started w/ draft-lasserre-tls-mpls-00.txt
  about 15 months ago
• Soon after there was a draft-vkompella to address
  signaling aspects for MAC address learning and
  withdrawal
• After that the following drafts were issued to
  address system scalability in terms of PWs and
  its associated signaling
• Logical PE
• Distributed TLS
• Hierarchical VPLS
• VPLS (Distributed) Architectures

8
VPLS Evolution - Continue

• Then there was consolidation among number of
  drafts
• Next there was a quite period
• And now There is a new set of solutions

9
VPLS Evolution - Continue

• During Consolidation phase, the following drafts
  got merged together
• draft-lasserre got first merged with
  draft-vkompella
• the resultant draft got merged with
  draft-khandekar
• the resultant draft got merged with draft-sajassi

10
VPLS Evolution - Continue

• The first generation of drafts were based on PtP
  PWs
• New drafts try to address two areas
• MAC address reduction in the access network
  using MAC-in-MAC
• PWs reduction in the core using MPtP PWs and
  more efficient forwarding in the Egress PE

11
New Solutions on VPLS

• Two categories of drafts
• Category 1 MAC-in-MAC encapsulation
• E-HVPLS
• VHLS
• Category 2 Use of MP2P MP2MP PWs
• IPLS
• MVPLS
• GVPLS

12
E-HVPLS Enhanced HVPLS

• SP Assigns a MAC address to each Attachment
  Circuit on U-PE and N-PE
• All customer Ethernet frames over that AC gets
  encapsulated using the assigned MAC address

13
VHLS Virtual Hierarchical LAN Services

• Same as E-HVPLS except it assigns a MAC address
  to a U-PE instead of an AC of the U-PE
• It used a VPN-id to uniquely identify a VPLS
  instance since
• Forwarding table is keyed using MAC VPN-id (9
  bytes)
• All customer Ethernet frames from the U-PE gets
  encapsulated using the assigned MAC address and
  VPN-id

14
IPLS IP LAN Services

• A VPLS type solution optimized for IP routers as
  CEs
• Forwarding is done in data plane
• Learning is done in control plane (using proxy
  ARP)
• Forwarding is asymmetric (uses MAC addresses in
  ingress PE but not egress PE) thus more efficient
• A MP2P PW (MPLS label) is used for each attached
  CE
• A MP2MP PW (a set of labels) is used for
  multicast/broadcast
• Packet replication for MP2MP PW is done at the
  N-PE

15
MPVLS VPLS based on IP Multicast

• Forwarding and learning are done in data plane
• Forwarding is asymmetric (uses MAC addresses in
  ingress PE but not egress PE) thus more efficient
• A MP2P PW (IP address) is used for each
  Attachment Circuit (not attached CE)
• A MP2MP PW is used for multicast/broadcast and
  unknown unicast frames
• One multicast group is used per VPLS instance
• Packet replication for MP2MP PW is distributed
  over the core

16
GPVLS Generic VPLS

• Forwarding and learning are done in data plane
• Forwarding can be both symmetric and asymmetric
• A MP2P PW (MPLS Label) is used for each
  Attachment Circuit or each VPLS instance at the
  egress PE
• A MP2MP PW is used for multicast/broadcast and
  unknown unicast frames
• Packet replication for MP2MP PW is done at the
  N-PE