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Joint ITU-T/IEEE Workshop on The Future of Ethernet Transport (Geneva, 28 May 2010). PBB-TE Infrastructure Protection Switching Operation. Bob Sultan, Huawei Technologies. Topics. Review PBB-TE Forwarding The Infrastructure Segment and IPG Monitoring the Segment Provisioning an IPG

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PBB-TE Infrastructure Protection Switching Operation

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Pbb te infrastructure protection switching operation

Joint ITU-T/IEEE Workshop

on The Future of Ethernet Transport(Geneva, 28 May 2010)

PBB-TE Infrastructure Protection Switching Operation

Bob Sultan,

Huawei Technologies


Topics

Topics

  • Review PBB-TE Forwarding

  • The Infrastructure Segment and IPG

  • Monitoring the Segment

  • Provisioning an IPG

  • Infrastructure Protection Switching


Pbb te forwarding esp

PBB-TE Forwarding (ESP)

FDB D

Filtering Database (FDB) B

<DA, VID>

<DA, VID>

Port Out

Port Out

<E, 7>

P1

<E, 7>

P2

P2

ESP X

P2

A

B

D

E

P1

P1

C

P2

P3

P1

FDB C

P3

P3

<DA, VID>

Port Out

<E, 7>

P3

  • Ethernet Switched Path (ESP) forwarding is based on provisioned 2-tuple <Destination MAC, VLAN Identifier> and associated outbound local port;


Pbb te forwarding tesi

A pair of counterdirectional congruent PtP ESPs form a PtP Traffic Engineered Service Instance (TESI);

IPS also applies to linear portions of PtMP TESIs;

PBB-TE Forwarding (TESI)

FDB D

Filtering Database (FDB) B

<DA, VID>

<DA, VID>

Port Out

Port Out

<E, 7>

P1

<E, 7>

P2

<A, 8>

P2

<A, 8>

P1

P2

ESP x

P2

A

B

D

E

P1

P1

C

P2

P3

P1

ESP y

FDB C

P3

TESI

P3

<DA, VID>

Port Out

<E, 7>

P3

<A, 8>

P1

4

Geneva, 28 May 2010


Segment

A segment is specified by a sequence of ports:

Green: B.P2 – C.P1 – C.P3 – D.P2

Red: F.P2 – G.P1 – G.P2 – H.P2

Bridge terminating a segment contains exactly one port associated with that segment;

Segment

P2

ESP x

P2

A

B

D

E

P1

P1

C

P2

P3

P1

P3

P3

P1

P1

F

P2

H

P2

G

P1

P2

5

Geneva, 28 May 2010


Segment monitoring

The state of an Infrastructure Segment is monitored by a Maintenance Association (MA) specific to that Segment;

Distinct type of MA; not the same as the PBB-TE MA associated with a TESI;

Terminates at PBP vs. CBP;

Down MEPs vs. Up MEPs;

Segment Monitoring

CCM

CCM

CCM

CCM

CCM

CCM

Green MEP

Green MEP

Green Segment MA

A

B

D

E

C

6

Geneva, 28 May 2010


Infrastructure protection group ipg

Non-overlapping segments having the same pair of segment endpoint bridges (SEB) form an IPG;

A Bridge maintains a table for each IPG terminating in that Bridge (just one shown in this figure);

The table contains a list of 2-tuples representing traffic provisioned to follow one of the Infrastructure Segments which is known as the Working Segment;

Infrastructure Protection Group (IPG)

I

J

SEB

SEB

A

B

D

E

C

Working Segment

IPG

IPG

<I, 9>

<J, 11>

F

H

G

<E, 7>

<A, 6>

7

Geneva, 28 May 2010


Protection segment

Protection Segment

The Protection Segment provides an alternate path for traffic associated with the listed 2-tuples for the IPG;

The IPG maintains the local port numbers associated with the Working and Protection Segments respectively;

I

J

SEB

SEB

P2

P2

A

B

D

E

C

Working Segment

P3

P3

IPG

IPG

WS: P2

WS: P2

PS: P3

Protection Segment

PS: P3

F

H

G

<I, 9>

<J, 11>

<A, 6>

<E, 7>

8

Geneva, 28 May 2010


Protection segment provisioning

Protection Segment Provisioning

Same list of 2-tuples at F, G, H; but provisioned as if traffic was forwarded on Protection Segment;

FDB B

<DA, VID>

Port Out

<E, 7>

P2

<A, 8>

P1

I

J

<J, 11>

P2

<I, 9>

P4

P4

P2

P2

A

B

D

E

C

P1

P3

P3

IPG

WS: P2

IPG

P1

PS: P3

WS: P2

F

H

P2

G

<I, 9>

PS: P3

<A, 6>

<J, 11>

FDB F

<E, 7>

<DA, VID>

Port Out

<E, 7>

P2

<A, 8>

P1

<J, 11>

P2

<I, 9>

P1

9

Geneva, 28 May 2010


Infrastructure protection switching

Infrastructure Protection Switching

Protection switch triggered by detection of state change in IPG Segment or manually;

Requires FDB update only at endpoint bridges;

Update only entries with 2-tuple in IPG list;

FDB D

FDB B

<DA, VID>

Port Out

<DA, VID>

Port Out

P3

<E, 7>

P1

<E, 7>

P2

<A, 8>

P2

P3

<A, 8>

P1

I

J

<J, 11>

P4

<J, 11>

P2

P3

<I, 9>

P2

<I, 9>

P4

P3

P4

P4

P2

X

P2

A

B

D

E

C

P1

P1

P3

P3

IPG

IPG

WS: P2

WS: P2

P1

PS: P3

PS: P3

F

H

P2

G

<I, 9>

<J, 11>

<A, 6>

<E, 7>

10

Geneva, 28 May 2010


Further points

Further Points

The IPS State Machine is identical to the TESI Protection State Machine

Except for the lowest-level functions that update the FDB outbound port values instead of changing the mapping from backbone service instance to BVID;

The TESI Protection State Machine is similar, but not identical, to the G.8031 State Machine;

IPS specifies optional M:1 protection, deployed by using an alternate Protection Segment when a Protection of higher priority is not available;

IPS supports the nesting of IPGs but this requires appropriate provisioning of hold-off timer values;

Further, the MA associated with the outer IPG must be provisioned to be protection switched by the inner IPG when a failure of the inner IPG occurs;

11

Geneva, 28 May 2010


Thank you

Thank You

12

Geneva, 28 May 2010


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