024 - Ceragon - 802.1q - Presentation v3.2

8/18/2019 024 - Ceragon - 802.1q - Presentation v3.2

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Proprietary and Confidential

Introduction to 802.1 P/Q


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Prerequisites

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Prior to taking this module, trainee should be familiar with thefollowing:

•Ethernet Topologies

•OSI 7 a!ers model


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Agenda "genda

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" a!er # Proto$ol whi$h enables enhan$ed

traffi$ maneu%ers :

• Prioriti&ation

• 'iltering• Pro%isioning• (apping )e*g* + "T( tofrom ET-.

/hat is 0"12

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/hat is 0"12

3egular ET- networks forward broad$ast frames to all endpoints

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0"1 networks forward broad$ast frames onl! to pre+defined ports)Profile (embership.

0"1 4

0"1 567

Swit$h ports

/hat is 0"12

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• reaking large networks into smaller parts )'ormation of %irtual workgroups.

• Simplified "dministration )no need for re+$abling when user mo%es.

• Impro%ing road$ast 8 (ulti$ast traffi$ utili&ation

• (apping e9pensi%e ba$kbones )"T(. to simpler 8 $heaper ET- ba$kbones

• Se$urit! establishing tunnels trunks through the network for dedi$atedusers )traffi$ between 0"1s is restri$ted.*

"d%antages of 0"1

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efore we start e9plaining bit b! bit, what is 0"1

and how does it work, let us re%iew first the

stru$ture of a regular ET- frame

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Length / Type < 1500 + Parameter indi$ates number of ;ata !tes

Length / Type > 1536 + Parameter indi$ates Proto$ol T!pe )PPPoE, PPPo", "3P et$*.

Preamble +SFD

DA SA Length / !"e DAA + PAD F#S

< !tes < !tes= !tes # !tes 6< + 45>> !tes6 !tes

)?#+bit

@3@.

'@S is $reated b! the sender and re$al$ulated b! the re$ei%er

Minimum 64 Bytes < FRAME SIE < M!"imum 151# Bytes

Antagged Ethernet 'rame

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• "dditional information is inserted

• 'rame si&e in$reases to 45## !tes

Tagged Ethernet 'rame

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4 Bytes

TPI; B Tag proto$ol I;

T@I B Tag @ontrol Information

@'I B 4 bit $anoni$al 'ormat Indi$ator

Preamble + SFD DA SA Length / !"e DAA + PAD F#S

? it 4 it 4# it

#I

#FI

$LA% A&

P'A& $LA% ID

PID (

0)8100



0"1 I; uses 4# bits, therefore the number of ma9imum 0"1s is

6>CC<• 0I; > B reser%ed

• 0I; 6>C>+6>C< B reser%ed )dedi$ated for IP+4>s internal purposes su$h as (1F et$*.• 0I; 4 B default

• "fter tagging a frame, '@S is re$al$ulated

• @'I is set to > for ET- frames, 4 for Token 3ing to allow T3 frames o%er

ET- ba$kbones )some %endors ma! use @'I for internal purposes.

Tagging a 'rame

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Protocol t!"e $alue

agged Frame 0)8100

A*P 0)080

Q'in'Q ,#IS#- 0)8100

Q'in'Q ,otherendor

0)88A8

Q'in'Q ,otherendor

0)100

Q'in'Q ,otherendor

0)200

*A*P 0)803

IP 0)0800

IP 0)8DD

PPPo4

0)88/0)88

5

6PLS0)8857/0)8858

IS'IS 0)8000

LA#P 0)880

802.1) 0)8884

TPI; in tagged frames in alwa!s set to

>9=4>>

It is important that !ou understand the

meaning and usage of this parameter

ater when we dis$uss GoS, we shall

demonstrate how 8 wh! the s!stem

audits this parameter

TPI; ET-E3+T!pe Proto$ol T!peH

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E%er! swit$h port is asso$iated with spe$ifi$ 0"1 membership

• P3O eas! $onfigured• @O1 no user mobilit!

'or e9ample ports 4,# 8 $an see ea$h other but $annot PI1F

other ports )different 0"1 membership.

0"1 (embership: ! Port

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1 2 3 4 5 6 7 8

VLAN 1

V L A N

2 2

V L A N

5

V L A N

3 3 3

V L A N

9

V L A N

1 0 0


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P3O user mobilit!, no

re$onfiguration when P@mo%es

@O1 needs to be assigned

initiall!, not an eas! task

with thousands of

endpoints

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0"1 (embership: ! ("@

>>:#>:=f:6>:45:?4

>>:#>:=f:6>:45:?>>>:#>:=f:6>:45:ef

00$33$e%$3#$01$&3

00$33$e%$3#$01$&500$33$e%$3#$01$!0

VLAN 44

VLAN 5


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(embership is based on the a!er ? header

1o pro$ess of IP address is done

(ain disad%antage longer o%erall throughput

0"1 (embership: ! Subnet )? 0"1.

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4>*4>*4>*4#

4>*4>*4>*4##4>*4>*4>*4?

11'1'1'10'1&

11'1'1'10'&311'1'1'10

VLAN 44

VLAN 5


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$LA% aare

Sitch

;e%i$e unaware of 0"1s

transmits untagged

)regular. ET- frames

Swit$h tags the ingress

frames with 0I; a$$ording

to spe$ifi$ Tagging

me$hanism

"$$ess Port a port whi$h is not aware of 0"1s

)@annot tag outgoing frames or un+tag in$oming frames.

A

Port T!pes

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;e%i$e unaware of 0"1s

transmits untagged

)regular. ET- frames

Swit$h tags the ingress frames with 0I; a$$ording to

spe$ifi$ Tagging me$hanism

Swit$h un+tags frames with 0I; re$ei%ed from network

and deli%ers untagged frames to "$$ess ports

Trunk Port a port whi$h is aware of 0"1s

)@an tag or un+tag in$oming frames.

$LA% aare

SitchA

Port T!pes

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$LA% aare

Sitch

Trunk Port $an $arr! tagged frames with different 0I;s*This requires Port (embership $onfiguration*

A

A A

hi "ort i not a member o9 the run:

"ort memberhi" lit; hence;tra


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• "dditional 0"1 )S+0"1. is inserted

• 'rame si&e in$reases to 45#< !tes

G+in+G

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4 Bytes

Preamble +SFD

DA SA Length / !"e

DAA +PAD

F#S

? it 4 it 4# it

#FI

S '$LA%

PID (

0)88A8

P'A& $LA%ID

#I

#FI

P'A&$LA%ID

#I PID (

0)8100

# '$LA%

4 Bytes

? it 4 it 4# it


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$LA%

aare Sitch

G+in+G )"*J*"* ;ouble TaggingH0"1 En$apsulationH.

Enhan$ed se$urit! not e9posing original 0I;

Impro%ed fle9ibilit! of 0I; in the network

)Ingress 0I; was alread! assigned in the network.

#% P%

K

Port T!pes

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Introdu$tion to GoS @oS

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/e $an e9tend the benefits of "T( GoS into Ethernet "1s to guarantee Ethernet priorities

a$ross the "T( ba$kbone* " # swit$h or ? router reads in$oming =>#*4p or IP ToS priorit!bits, and $lassifies traffi$ a$$ordingl!*

To mat$h the priorit! le%el with the appropriate "T( ser%i$e $lass and other parameters, the

swit$h then $onsults a mapping table with pre+defined settings*

@3

03

A3

P+Tag <

P+Tag 6

P+Tag >

(apping "T( GoS o%er ET- @oS )3'@ 46=?.

Core

Site

Hub

Site

Tail site

RNC

BSC/MSC

FibeAir

IP-10

n x T1/E1

FE/E

E

E

ST!1/

"C3

"T(

3outer

MPLS

Router IP-10

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(apping ET- to (PS and %i$e %ersa

Core

Site

Hub

Site

Tail site

RNC

BSC/MSC

FibeAir

IP-10

n x T1/E1

FE/E

E

E

ST!1/

"C3

ST!1/

"C3

MPLS

Router

MPLSRouter IP-10

IP+4>s # swit$h $an take part in the pro$ess of transporting

ser%i$es through (PS $ore

'ramesser%i$es are mapped to (PS 'E@s a$$ording to:

• 0"1 I; mapped to (PS ELP bits

• 0"1 P+it mapped to (PS ELP bits

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IngreP'ag

%umber o9 Aailable ra


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• The default priorit! used for transmission b! end stations is >

• /ith a single queue, there are no $hoi$es* "ll traffi$ is est Effort

• (ultiple queues are needed to isolate 1etwork @ontrol from the user data traffi$

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0"1 P+it 3emap )Traffi$ @lasses.


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"$ron!ms

• ET- Ethernet• 1I@ 1etwork Internet @ard• 0I; 0lan I;• 0"1 0irtual "1• P+T"F Priorit! Tag, Priorit! its

• @'I @anoni$al 'ormat Indi$ator • TPI; Tag Proto$ol Identifier • '@S 'rame @he$k Sequen$e• ;" ;estination "ddress• S" Sour$e "ddress

• GoS Gualit! of Ser%i$e

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"sso$iated IEEE Standards

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• IEEE 802.3 = 4thernet ,6a). 9rame i>e ( 1318 b!te

• IEEE 802.3ac = 4thernet ,(a9* frame si&e B 45## b!tes.

• IEEE 802.1 d = 6A# ?ridge @rt introduced the conce"t o9Filtering Serice in a bridged local netor:

• IEEE 802.1 q = $LA% agging

• IEEE 802.1 p = Priorit! agging / 6a""ing

• I444 802.1ag = -A6 ,#F6


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Thank !u "

trainingceragon.com

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024 - Ceragon - 802.1q - Presentation v3.2

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