1. PBB TE
PBB-TE
(c) Anuradha Udunuwara 1

2. Agenda
• Introduction
• QinQ
• PBB
• PBB-TE
• Conclusion
(c) Anuradha Udunuwara 2

3. Introduction
(c) Anuradha Udunuwara 3

4. Connection-less (CL) networking based
( L) w g
on Ethernet and IP/MPLS has been
around for some time. There are m y
f m m . many
carriers who have not only implemented
these technologies, but have used them
g , m
to completely replace their legacy
network So, why are we discussing
network. So
connection-oriented(CO) packet
networking?
t ki ?
(c) Anuradha Udunuwara 4

5. Carrier Ethernet options
• PBB-TE MPLS TP
PBB TE, MPLS-TP
– no control plane (like MPLS in IP/MPLS)
– uses EMS/NMS for provisioning
• NMS based control plane
• centralized intelligence on a server
• vendor sticky
– no multi point
– smaller forwarding tables
• MPLS
(c) Anuradha Udunuwara 5

6. QinQ
(c) Anuradha Udunuwara 6

7. QinQ
= 802 1QiQ
802.1QiQ
= 802.1ad
= P id Bridging (PB)
Provider B id i
[C-VLAN inner, S-VLAN outer]
In this scenario provider needs to learn
scenario,
all customer MACs.
(c) Anuradha Udunuwara 7

8. Where is it most appropriate to use Q-in-Q and
MAC-in-MAC i
MAC i MAC in a Hi Hierarchical L2 Network?
hi l N t k?
• MAC-in-MAC core domain surrounded by
MAC in MAC
Q-in-Q access domains.
– Removes need for global Q-tag management
• Locally convert MAC-in-MAC service tag to local
Q g
Q-tag
– Reduces number of MAC addresses seen by
MAC-in-MAC domain to number of Q-in-Q
domains.
(c) Anuradha Udunuwara 8

9. Why Not VPLS End-to-End?
End to End?
• VPLS has scalability issues
– E.g. to connect 5 PE devices requires 20
LSPs [(n*(n-1)/2)*2] 40 PEs: 1 536
[(n (n 1)/2) 2], 1,536.
– Large bandwidth loss due to broadcast
retransmissions.
• VPLS requires new features
– Protection OAM discovery
Protection, OAM,
(c) Anuradha Udunuwara 9

10. PBB
(c) Anuradha Udunuwara 10

11. PBB
= 802.1ah
802 1ah
= Provider Backbone Bridging(PBB)
= MAC in MAC
i
(c) Anuradha Udunuwara 11

12. PBB
• PBB uses STP (PBB-TE does not use
STP)
• PBB stops the access MAC
h
complexity form core.
p y
– Ex:- run PBB at access and VPLS in
the core (so the VSI needs to learn
only the S-MAC not 100,000 of C-
MACs)
(c) Anuradha Udunuwara 12

13. PBB TE
PBB-TE
(c) Anuradha Udunuwara 13

14. PBB TE
PBB-TE
= 802 1Qay
802.1Qay
= Provider Backbone Bridging –Traffic
Engineering
E i i
= PBT (Provider Backbone Transport) by
p y
Nortel
Both PBB-TE and MPLS-TP has “SDH-like”
operation
(c) Anuradha Udunuwara 14

15. PBB-TE builds on Ethernet
• MPLS-TP requires an underlying L1/L2
p
protocol …… at a time when Ethernet is
migrating to the MAN and WAN as the
ubiquitous underlying L1/L2 protocol
• MPLS TP proposes t use a L2 switching l b l
MPLS-TP to it hi label
that is unrelated to Ethernet’s addressing
scheme
– And define its own control plane and management
plane
• PBB TE proposes t use a Eth
PBB-TE to Ethernet’s
t’
addressing scheme
– And leverage Ethernet’s PBB provider header,
Ethernet s header
management plane and control plane
(c) Anuradha Udunuwara 15

16. • PBB-TE was designed to handle point-
PBB TE point
to-point data services in a PBB network.
(c) Anuradha Udunuwara 16

17. While PBB provides for Carrier-Ethernet
switching,
PBB-TE provides for Carrier-Ethernet
Transport
through the addition of the following
characteristics:
• Ability to provision protected virtual circuits
• Improved control of the transport layer's
layer s
operational state through SDH-like OA&M
• Improved network and survivability
mechanisms such as protection and
restoration as seen in SDH
(c) Anuradha Udunuwara 17

18. The PBB-TE Advantage
• Secure Demarcation
– Customer networks may have overlapping addresses, which
could cause forwarding conflicts in the Telecom Operators
network.
• Customer Separation & Service Scalability
– PBB provides 16 million unique service id
id illi i i identifiers, apart from
ifi f
providing 2 transport tunnels.
• Single-ended Provisioning
– only the end-nodes have to be provisioned
(c) Anuradha Udunuwara 18

19. PBB/PBB-TE combination
• PBB and PBB-TE can be deployed in the same network,
p y ,
and can also share a fiber pair.
• Network nodes use the B-VLAN field in the PBB
header t diff
h d to differentiate between th PBB and PBB TE
ti t b t the d PBB-TE
traffic.
• While PBB traff c can be protected using ERPS (ITU-
Wh le BB traffic us ng E S (
T G.8032), the PBB-TE traffic is protected using EPS
(ITU-T G.8031).
• H
Hence, while PBB-TE can be used to transport
hil PBB TE b dt t t
services that require traffic-engineering, PBB can be
used for any-to-any or multipoint services, all on the
y y p
same network.
(c) Anuradha Udunuwara 19

20. Conclusion
(c) Anuradha Udunuwara 20

21. • All three (MPLS/VPLS, MPLS-TP, PBB-TE)
solve the same problem
• MPLS-TP is born out of realization that
M LS/V LS s
MPLS/VPLS is complex and expensive
expens ve
– Essentially confirms providers only really have a
long term choice between MPLS-TP and PBB-TE
• So why chose PBB-TE over MPLS-TP, or vice-
versa?
(c) Anuradha Udunuwara 21