Netmanias기술문서:IEEE802.1adPB(ProviderBridge)표준분석

IEEE802.1adPB(ProviderBridge)표준분석
2007년08월5일
NMCConsultingGroup(tech@netmanias.com)

2
.Formerlyknownas“StackedVLAN”or“StackableVLAN”
.TunnelingusingS-TAG(ServiceVlanTag,TagType=88A8h)
.C-TAG(CustomerVlanTag,Tagtype=8100h)
.보통의 Ethernet II Frame에서 사용되지 않는 CFI bit를 DEI bit로사용 (S-tag내에서 사용)
.기존 C-tag내의 3 bit PCP값 범위내에서 DEI를 표현하기 위해 7P1D, 6P2D, 5P3D등의 mode를 제시하고 Encoding/Decoding 방법을 제시함
IEEE802.1AD
PCP(PriorityCodePoint)
DEI(DropEligibleIndicator)
Default8P0D
※Priorityfollowedbytheletters“DE”ifdropeligibleisTRUE.
802.1adEncapsulation

3
그림1
ProviderBridgedNetwork
Customer
Network(vlan10)
Customer
Network(vlan10)
FCS
32
Payload
E-Type
16
C-VID
12
10
E-Type
16
8100H
SA
48
A
DA
48
D
FCS
32
Payload
E-Type
16
C-VID
12
10
E-Type
16
8100H
S-VID
12
200
E-Type
16
88A8H
SA
48
A
DA
48
D
FCS
32
Payload
E-Type
16
C-VID
12
10
E-Type
16
8100H
SA
48
A
DA
48
D
MACA
MACB
MACC
MACD
S-VLANMACTABLE
MACA
P1
V200
MACB
P1
V200
MACC
P2
V200
MACD
P2
v200
S-VLANMACTABLE
MACA
P1
V200
MACB
P1
V200
MACC
P2
V200
MACD
P2
V200
S-VLANMACTABLE
MACA
P1
V200
MACB
P1
V200
MACC
P2
V200
MACD
P2
V200
CustomerNetwork의MacAddress들이PBN의모든Bridge들에서Learning됨
1.MacSeparation안됨2.Scalability제약이생김
MACA
MACD
Vlan200
C-VLAN:10
S-VLAN:200
.MacSeparationisnotsupported(i.e.PBsalsolearncustomeraddresses)
.BPDUProcessingisseparated(customerBPDUsaretunneledthroughPBNjustasnormaldatapackets)
.LimitedScalability(MACaddressestablecapacity,S-VIDLimitation)
MACA’sBPDU
BPDU는TAG를포함할수없으므로CustomerNetwork과ProviderNetwork를구분하기위해ProviderBridgeGroupAddress로01:80:C2:00:00:08을Reserve했음.
MACA’sBPDU
ProviderBPDU
C-VLANMACTABLE
MACA
P1
V10
MACB
P1
V10
MACC
P2
V10
MACD
P2
v10
C-VLANMACTABLE
MACA
P1
V10
MACB
P1
V10
MACC
P2
V10
MACD
P2
V10
802.1adOverview

4
.ServiceTransparency
.CustomerServiceInterfaces
.Port-basedServiceInterface
.C-taggedServiceInterface
.S-taggedServiceInterface
.Serviceinstancesegregation
.Serviceinstanceselectionandidentification
.ServicePrioritySelection
.ServiceAccessProtection
.CFM(ConnectFaultManagement)
PNP(ProviderNetworkPort)
CNP(CustomerNetworkPort)
CEP(CustomerEdgePort)
PEP(ProviderEdgePort)
S-VID(ServiceVLANIdentifier)
C-VID(CustomerVLANIdentifier)
CustomerNetworkPort
ProviderEdgePort
ProviderEdgeBridge
ProviderNetworkPort
CustomerEdgePort
C-VLANcomp
InternalLan
S-VLANcomp
ProviderPort:Customer에서ProviderNetwork으로향하는Port
CustomerPort:하나의Customer의방향으로만향하는Port
NetworkPort:S-VLANComponent의Port
EdgePort:C-VLANComponent의Port
InternalLAN:C-VLANcomponent와S-VLANcomponent를연결하는내부적으로사용되는LAN(=Link)
MACServicesbyPBN

5
NetworkPortConfigurationManagedObject
1)CustomerNetworkPort에PVID설정2)PEP를CVLAN에추가3)PEP와CEP를CVLAN의UntaggedSet에추가(포트가Untagged로설정되어져야할경우만)
CustomerNetworkPort
ProviderEdgePort
ProviderEdgeBridge
ProviderNetworkPort
CustomerEdgePort
C-VLANcomp
InternalLan
PNP(ProviderNetworkPort)
CNP(CustomerNetworkPort)
CEP(CustomerEdgePort)
ProviderBridgePortTypeManagedObject
ProviderBridgePortType
VIDTranslationTable
LocalS-VID..RelayS-VID
CustomerEdgePortConfigurationManagedObject
ServicePriorityRegenerationTable
C-VIDRegistrationTable
C-VID..S-VID
ForwardingProcess
FilteringDatabase
InternalConnections
ProviderEdgePortConfiguration
CustomerNetworkPort
ProviderNetworkPort
ProviderBridge
S-VLANcomp
S-VLANcomp
PortComponents(1/2)

6
CustomerEdgePortConfigurationManagedObject
ServicePriorityRegenerationTable
C-VIDRegistrationTable
ForwardingProcess
FilteringDatabase
InternalConnections
ProviderEdgePortConfiguration
CEPnumber,C-VID
1)S-VID2)UntaggedPEP3)UntaggedCEP
CEPnumber,S-VID
1)PVIDonPEP2)DefaultUserPriority3)AcceptableFrameTypesa.AdmitonlyVLAN-Taggedframesb.AdmitonlyUntaggedandPriority-Taggedframesc.Admitallframes4)EnableIngressFilteringatPEPa.Enableb.Disable
CEPnumber,S-VID
1)ReceivedPriority0~7:Integerrange0~7
CustomerNetworkPort
ProviderEdgePort
ProviderEdgeBridge
ProviderNetworkPort
CustomerEdgePort
C-VLANcomp
InternalLan
S-VLANcomp
PortComponents(2/2)

7
.CustomerSystemcantransmitonlyUntaggedFrameorPriorityTaggedFrames
.S-VIDisdeterminedatProviderBridge’sCNP(CustomerNetworkPort).
.PrioritycanbedeterminedbyPriorityTaggedFrameandcanbechangedbyPRTable(PriorityRegenerationTable)
Port-basedSI
CE
CE
CustomerNetwork
CustomerA
CustomerB
CVLANAwareCEs
S-VID=10,*PVID=10
S-VID=20,*PVID=20
S-Component
CNP#1
CNP#2
PNP#1
PNP#2
ProviderBridge(PB)
AdmitonlyUntaggedandPriorityTaggedFrames
AssignPVIDateachCNPandPVIDdeterminesFrame’sSVID
It’saServiceInstanceSelection
PB
PB
PRTable
PRTable
ProviderNetwork
PBcanregeneratethepriorityoftheFrameatCNP.
Bydefault,valuesarethesamewithreceivedpriorities.
Untagged/PriorityTagged
S-Tagged
PNPProviderNetworkPort
CNPCustomerNetworkPort
CEPCustomerEdgePort
PEPProviderEdgePort
S-VIDServiceVLANIdentifier
C-VIDCustomerVLANIdentifier
PRTablePriorityRegenerationTable
Port-basedServiceInterface:FunctionalBehavior

8
Port-basedSI
CE
CE
CustomerNetwork
CustomerA
CustomerB
CVLANAwareCEs
S-VID=10,*PVID=10
S-VID=20,*PVID=20
S-Component
CNP#2
PNP#1
PNP#2
ProviderBridge(PB)
AdmitonlyUntaggedandPriorityTaggedFrames
AssignPVIDateachCNPandPVIDdeterminesFrame’sSVID
It’saServiceInstanceSelection
PB
PB
PRTable
PRTable
ProviderNetwork
PBcanregeneratethepriorityoftheFrameatCNP.
Bydefault,valuesarethesamewithreceivedpriorities.
Untagged/PriorityTagged
S-Tagged
S-VID=20,*PVID=20
PNP#2
PE
PRTable
PRTable
S-Tagged
PVID(forport-basedS-VLANclassification)
PVID=10
AcceptableFrameType
AdmitOnlyUntaggedandPriority-taggedframes
VLANConfigforS-VID=10
MemberPorts={CNP#1,PNP#1}
TXUntaggedPorts={CIP#1}
PBcanregeneratethepriorityoftheFrameatCNP.Bydefault,valuesarethesamewithreceivedpriorities.
AcceptableFrameType
AdmitOnlyUntaggedandPriority-taggedframes
PVID(forport-basedS-VLANclassification)
PVID=20
VLANConfigforS-VID=20
MemberPorts={CNP#2,PNP#2}
TXUntaggedPorts={CIP#}
PBcanregeneratethepriorityoftheFrameatCNP.
Bydefault,valuesarethesamewithreceivedpriorities.
PriorityRegenerationTable
ForPriority0~7
CNP#1
Port-BasedServiceInterface:PrincipalConfigurationParameters

9
bluecloud3
PBN
S-taggedInterface
PB
CE2
CustomerA(Site2)
PB
Port-basedSI
Port-basedSI
CE1
S-VID=10,*PVID=10
S-Component
CNP#1
CNP#2
PNP#1
PNP#2
ProviderBridge(PB)
CustomerA(Site1)
Payload
E-Type
SA
CE1
DA
CE2
UntaggedFrame
Payload
E-Type
SVID
10
E-Type
88-A8h
SA
CE1
DA
CE2
S-taggedFrame
Payload
E-Type
SA
CE1
DA
CE2
UntaggedFrame
IncomingUntaggedFramefromCustomerNetwork
S-taggingwithS-VID10
※PriorityTaggedFrame은S-Tag에S-VID가없으므로UntaggedFrame과동일하게처리하나Priority관련된처리만함.
Port-BasedServiceInterface:FrameEncapsulationforUntaggedCustomerFrames

10
.AllFramesfromCustomerAhavetobetaggedwithC-TAG.
.FramesaretranslatedbasedonCVIDRegistrationTable.
C-taggedbasedSI
CE
CustomerNetwork
CustomerA
S-VID=10,*PVID=10
S-VID=20,*PVID=20
S-Component
CNP#1
CNP#2
PNP#1
PNP#2
PEB(ProviderEdgeBridge)
AssignPVIDateachCNPandPVIDdeterminesFrame’sSVID
PB
PB
PRTable
PRTable
ProviderNetwork
PBcanregeneratethepriorityoftheFrameatCNP.
Bydefault,valuesarethesamewithreceivedpriorities.
S-Tagged
PNPProviderNetworkPort
CNPCustomerNetworkPort
CEPCustomerEdgePort
PEPProviderEdgePort
PEBProviderEdgeBridge
S-VIDServiceVLANIdentifier
C-VIDCustomerVLANIdentifier
PRTablePriorityRegenerationTable
C-Component
PEP#1
CEP#1
PEP#2
C-tagged
InternalLan
AdmitonlyTaggedFrames
InternalLan
C-VID=100(*PVID=100)
C-VID=200(*PVID=200)
C-VID=100
C-VID=200
S-VID=10
S-VID=20
C-compdistinguishTrafficsbyCVIDs.
It’saServiceInstanceSelection
CVIDRegistrationTable
CVID
SVID
100
10
200
20
FDBsupportsCustomerNetworkandProviderNetworkHierarchy
C-taggedServiceInterface:FunctionalBehavior
MACTABLE
CNP#1
CEP#1
V100
MACA
V10
MACA
C-comp
S-comp

11
C-taggedbasedSI
CE
CustomerNetwork
CustomerA
S-VID=10,*PVID=10
S-VID=20,*PVID=20
S-Component
CNP#1
CNP#2
PNP#1
PNP#2
PEB(ProviderEdgeBridge)
AssignPVIDateachCNPandPVIDdeterminesFrame’sSVID
PB
PB
PRTable
PRTable
ProviderNetwork
PBcanregeneratethepriorityoftheFrameatCNP.
Bydefault,valuesarethesamewithreceivedpriorities.
S-Tagged
PNPProviderNetworkPort
CNPCustomerNetworkPort
CEPCustomerEdgePort
PEPProviderEdgePort
PEBProviderEdgeBridge
S-VIDServiceVLANIdentifier
C-VIDCustomerVLANIdentifier
PRTablePriorityRegenerationTable
C-Component
CEP#1
PEP#2
C-tagged
InternalLan
AdmitonlyTaggedFrames
InternalLan
CVIDRegistrationTable
CVID
SVID
100
10
200
20
C-VID=100(*PVID=100)
C-VID=200(*PVID=200)
C-VID=100
C-VID=200
S-VID=10
S-VID=20
C-compdistinguishTrafficsbyCVIDs.
It’saServiceInstanceSelection
PBcanregeneratethepriorityoftheFrameatCNP.
Bydefault,valuesarethesamewithreceivedpriorities.
PVID(basedonInternalLan)
PVID=100
VLANConfigforC-VID=100
MemberPorts={CEP#1,PEP#1}
CVIDRegistrationTable
TranslationMappingbetweenCVIDandSVID
AcceptableFrameType
AdminonlyTaggedFrames
S-VID=20,*PVID=20
PNP#2
PE
PRTable
S-Tagged
PVID(forport-basedS-VLANclassification)
PVID=10
AcceptableFrameType
AdmitOnlyTagged
VLANConfigforS-VID=10
MemberPorts={CNP#1,PNP#1}
TXUntaggedPorts={}
PriorityRegenerationTable
ForPriority0~7
PVID(basedonInternalLan)
PVID=200
VLANConfigforC-VID=200
MemberPorts={CEP#1,PEP#2}
CVIDRegistrationTable
TranslationMappingbetweenCVIDandSVID
PEP#1
C-taggedServiceInterface:PrincipalConfigurationParameters

12
bluecloud3
PBN
S-taggedInterface
PEB
CE2
CustomerA(Site2)
PB
C-taggedSI
C-taggedSI
CE1
S-VID=10,*PVID=10
S-Comp
PNP#1
PNP#2
ProviderBridge(PB)
CustomerA(Site1)
Payload
E-Type
CVID
200
E-Type
81-00h
SA
CE1
DA
CE2
C-taggedFrame
Payload
E-Type
CVID
200
E-Type
81-00h
SVID
20
E-Type
88-A8h
SA
CE1
DA
CE2
S-taggedFrame
C-taggedFrame
IncomingC-taggedFramefromCustomerNetwork
S-taggingwithS-VID20
※C-VID200인경우만표현,C-VID100인경우C-VID/S-VIDmapping만상이함
C-Comp
S-VID=20,*PVID=20
C-VID=100
C-VID=200
Payload
E-Type
CVID
200
E-Type
81-00h
SA
CE1
DA
CE2
CNP#1
CNP#2
C-TaggedServiceInterface:FrameEncapsulationforC-TaggedCustomerFrames

13
.ServiceInstanceSelectionisdoneatCNPwithagivenS-Tag.
.S-VIDcanbetranslatedatCNPwithVIDTranslationTable.
.PrioritycanbedeterminedbyPriorityTaggedFrameandcanbechangedbyPRTable(PriorityRegenerationTable)
S-TaggedSI
CE
CustomerNetwork
CustomerA
SVLANAwareCEs
S-VID=10
S-VID=200
S-Component
CNP#1
CNP#2
PNP#1
PNP#2
ProviderBridge(PB)
IngressFilteringforS-TaggedFrames
BasedonS-Tag
ServiceInstanceSelectionisprocessed.
PB
PB
PRTable
ProviderNetwork
AtCNP,VIDcanbetranslatedwithRelayedVIDbasedontheVIDTranslationTable
S-Tagged
S-Tagged
PNPProviderNetworkPort
CNPCustomerNetworkPort
CEPCustomerEdgePort
PEPProviderEdgePort
S-VIDServiceVLANIdentifier
C-VIDCustomerVLANIdentifier
PRTablePriorityRegenerationTable
S-VID=10
S-VID=20
LocalVID
RelayedVID
1
1
2
2
…
…
20
200
…
…
VIDTranslationTable
S-VID=10
S-VID=200
S-TaggedServiceInterface:FunctionalBehavior

14
S-TaggedSI
CE
CustomerNetwork
CustomerA
SVLANAwareCEs
S-VID=10
S-VID=200
S-Component
CNP#1
CNP#2
PNP#1
PNP#2
ProviderBridge(PB)
IngressFilteringforS-TaggedFrames
BasedonS-Tag
ServiceInstanceSelectionisprocessed.
PB
PB
PRTable
ProviderNetwork
AtCNP,VIDcanbetranslatedwithRelayedVIDbasedontheVIDTranslationTable
S-Tagged
S-Tagged
S-VID=10
S-VID=20
LocalVID
RelayedVID
1
1
2
2
…
…
20
200
…
…
VIDTranslationTable
S-VID=10
S-VID=200
S-VID=20,*PVID=20
PNP#2
PE
PRTable
S-Tagged
IngressFiltering
SoIt’spossibletoreceiveonlyS-taggedFrames
VLANConfigforS-VID=10
MemberPorts={CNP#1,PNP#1}
TXUntaggedPorts={}
VLANConfigforS-VID=200
MemberPorts={CNP#1,PNP#2}
TXUntaggedPorts={}
VIDTranslationTable
ItisapplicableatCNP{LocalVID=20,RelayedVID=200}
S-TaggedServiceInterface:PrincipalConfigurationParameters

15
bluecloud3
PBN
S-taggedInterface
PB
CE3
CustomerA(Site3)
PB
S-taggedSI
S-taggedSI
CE1
S-VID=10
S-Comp
CNP#1
CNP#2
PNP#1
PNP#2
ProviderBridge(PB)
CustomerA(Site1)
S-taggedFrame
Payload
E-Type
IPv4
SVID
200
E-Type
88-A8h
SA
CE1
DA
CE2
S-taggedFrame
S-taggedFrame
IncomingS-taggedFramefromCustomerNetwork
S-VIDistranslatedfrom20to200
S-VID=200
S-VID=10
S-VID=200
LocalVID
RelayedVID
1
1
2
2
…
…
20
200
…
…
VIDTranslationTable
S-VID=10
S-VID=20
CustomerA(Site2)
S-taggedSI
PB
Payload
E-Type
IPv4
SVID
20
E-Type
88-A8h
SA
CE1
DA
CE2
Payload
E-Type
IPv4
SVID
200
E-Type
88-A8h
SA
CE1
DA
CE2
※S-VID10의경우에는Encapsulation에변화없음
S-taggedInterface
PB
S-VID=10
S-VID=10
S-VID=10
S-TaggedServiceInterface:FrameEncapsulationforS-TaggedCustomerFrames

16
PB
PB
CustomerNetworkB
CustomerNetworkB’
InCaseofWhenPriorityisderivedfromS-Tagged
그림1
CE
E-Type
C-TAG
E-Type
8100H
S-VID
200
DEI
0
PCP
7
E-Type
88A8H
SA
DA
E-Type
C-TAG
E-Type
8100H
S-VID
200
DEI
0
PCP
3
E-Type
88A8H
SA
DA
E-Type
C-TAG
E-Type
8100H
S-VID
200
DEI
0
PCP
3
E-Type
88A8H
SA
DA
CE
E-Type
C-TAG
E-Type
8100H
S-VID
200
DEI
0
PCP
2
E-Type
88A8H
SA
DA
PB
RcvdPriority
Dfltpriority
CnfgdPriority
0
0
0
1
1
0
2
2
1
3
3
1
4
4
2
5
5
2
6
6
3
7
7
3
PriorityRegenerationTable
RcvdPriority
Dfltpriority
CnfgdPriority
0
0
0
1
1
0
2
2
1
3
3
2
4
4
4
5
5
5
6
6
6
7
7
7
E-Type
C-TAG
E-Type
C-VID
20
CFI
0
PCP
4
E-Type
8100H
SA
DA
C-VID
20
CFI
0
PCP
4
E-Type
8100H
S-VID
300
CFI
0
PCP
2
E-Type
88A8H
SA
DA
InCaseofWhenPriorityisderivedfromC-Tagged
PEB
PB
CustomerNetworkA
CustomerNetworkA’
CE
CE
PB
ProviderNetworkCore
C-VID
20
CFI
0
PCP
4
E-Type
8100H
S-VID
300
CFI
0
PCP
2
E-Type
88A8H
SA
DA
C-VID
20
CFI
0
PCP
4
E-Type
8100H
S-VID
300
CFI
0
PCP
1
E-Type
88A8H
SA
DA
PriorityRegenerationExample

17
PB
PB
CustomerNetworkB
CustomerNetworkB’
S-taggedInterface
그림1
CE
E-Type
C-TAG
E-Type
8100H
S-VID
300
DEI
0
PCP
0
E-Type
88A8H
SA
DA
E-Type
C-TAG
E-Type
8100H
S-VID
300
DEI
0
PCP
0
E-Type
88A8H
SA
DA
CE
E-Type
C-TAG
E-Type
8100H
S-VID
300
DEI
0
PCP
0
E-Type
88A8H
SA
DA
PB
LocalVID
RelayedVID
1
1
2
2
…
…
200
300
…
…
ProviderNetworkCore
S-VLANAwareCustomerEquipment
MACTABLE
MACA
P1
V300
MACB
P2
V300
E-Type
C-TAG
E-Type
8100H
S-VID
200
DEI
0
PCP
0
E-Type
88A8H
SA
A
DA
B
MACA
MACTABLE
MACA
P1
V300
MACB
P2
V300
MACTABLE
MACA
P1
V300
MACB
P2
V300
MACTABLE
MACA
P1
V300
MACB
P2
V300
MACTABLE
MACA
P1
V200
MACB
P2
V200
※MAC의ISS에서VlanTranslation이먼저일어난후에MacLearning이일어난다.따라서MACA는LocalVID인Vlan200에서Learning되지않고Vlan300에Learning된다.
MACB
Port-basedinterface
PVID=200
VLAN300P1,P2
VLAN300P1,P2
VLAN300P1,P2
VLAN300P1,P2
VIDTranslationTable
VID
Members
1
1
2
2
…
…
200
P1,P2
…
…
VID
Members
1
1
2
2
200
P1
300
P2
…
…
VID
Members
1
1
2
2
200
…
300
P1,P2
…
…
VID
Members
1
1
2
2
200
…
300
P1,P2
…
…
VID
Members
1
1
2
2
200
…
300
P1,P2
…
…
1.SeparateCustomerNetworkfromProviderNetwork
2.EvenifCustomeruseS-VID,ProviderdonothavetofollowthatS-VID.
3.It’sapplicableatonlyS-taggedInterfaces.
VIDTranslationTableExample

18
그림1
ProviderNetworkCore
ProviderBridgedNetwork
PB
PB
PB
PB
PB
PB
PB
PB
PB
PB
CE
CE
CE
PB
PB
CE
PEB
PB
PB
PEB
CE
CE
CE
CE
CustomerNetworkA
CustomerNetworkB
CustomerNetworkC
CustomerNetworkD
CustomerNetworkD’
CustomerNetworkC’
CustomerNetworkB’
CustomerNetworkA’
CTAG
UNTAG
STAG
UNTAG
PVID10적용S-Tag10
10
10
10
10
10
C-VIDRegstrationTable
40
40
40
40
40
VIDTranslationTable(optional)S-Tagging30
30
30
30
30
30
UNTAG
CNP에PVID40적용
CEP와PEP를CVLAN에추가필요한경우CEP,PEP를CVLAN의UntaggedSet으로설정
CEP가Untag로설정된경우
C-TaggedInterface
S-TaggedInterface
Port-basedInterface
Port-basedInterface
NetworkExample

19
01-80-C2-00-00-01~01-80-C2-00-01-0A까지의GroupAddresses들은
CustomerNetwork또는ProviderNetwork을구분하지않고
Hop-by-Hop으로Filtering된다.
01-80-C2-00-00-01~01-80-C2-00-01-0A까지의GroupAddresses들을제외한BPDU들은ProviderNetwork에서Bypass되어Customer-to-Customer로젂달된다.
802.1adReservedAddresses(1/2)

20
그림1
ProviderBridgedNetwork
Customer
Network(vlan10)
Customer
Network(vlan10)
MACB
MACD
Vlan200
01-80-C2-00-00-00
S-VID200Tunnel
01-80-C2-00-00-01
PB들은01-80-C2-00-00-00,01-80-C2-00-00-0B~01-80-C2-00-01-0F까지의GroupAddresses들은Filtering하지않는다.
MACB
MACA
MACC
01-80-C2-00-00-01~01-80-C2-00-01-0A까지의GroupAddresses들은Provider및CustomerBridge들에서모두Filtering한다(HopbyHop).
01-80-C2-00-00-00
01-80-C2-00-00-00
Customer
Network(vlan10)
01-80-C2-00-00-00
MACB
MACB
MACA
MACD
MACC
802.1adReservedAddresses(2/2)

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