Zhenbin li li zhang yuanjiao liu huawei technologies ietf 86 orlando fl usa
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OSPF Extensions for Automatic Computation of MPLS Traffic Engineering Path Using Traffic Engineering Layers and Areas draft-li-ospf-auto-mbb-te-path-00. Zhenbin Li, Li Zhang, Yuanjiao Liu Huawei Technologies IETF 86, Orlando, FL, USA. ATN. ATN. ATN. ATN. ATN.

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Zhenbin Li, Li Zhang, Yuanjiao Liu Huawei Technologies IETF 86, Orlando, FL, USA

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Zhenbin li li zhang yuanjiao liu huawei technologies ietf 86 orlando fl usa

OSPF Extensions for Automatic Computation of MPLS Traffic Engineering Path Using Traffic Engineering Layers and Areas draft-li-ospf-auto-mbb-te-path-00

Zhenbin Li, Li Zhang, Yuanjiao Liu

Huawei Technologies

IETF 86, Orlando, FL, USA


Application of mpls te in mbb

ATN

ATN

ATN

ATN

ATN

Application of MPLS TE in MBB

Last Mile

Access

Aggregation

RNC/SGW/MME

CSG

CSG

BSC

RSG

AGG

STM-1

BTS

E1

CSG

STM-1

PE

ATM

P

PE

ATM RNC

NodeB

CSG

GE

Tunnel

Eth.

AGG

RSG

CSG

NodeB / eNB

IP RNC/S-GW/MME

TDM/ATM Services

E2E PWE3

2G TDM PW

3G ATM PW

3G ETH VRF

LTE VRF S1

LTE VRF X2

2G TDM PW

3G ATM PW

3G ETH VRF

LTE VRF S1

LTE VRF X2

E2E L3VPN

Ethernet Service

  • MPLS TE is used in the network to carry L2VPN/L3VPN services, providing traffic engineering, OAM, etc.

  • As the network scale expands, more MPLS TE tunnels have to be deployed.

  • It is important to deploy MPLS TE tunnel easily.


Zhenbin li li zhang yuanjiao liu huawei technologies ietf 86 orlando fl usa

Problem Statement of MPLS TE Auto Path Computation

CSG

AGG

OSPF Area 0

Access Ring 1

RSG

AGG

CSG

Aggregate Ring

Access Ring 2

AGG

RSG

CSG

AGG

Access Ring3

CSG

Access Ring4

CSG

  • Requirement 1: Completely disjointed primary and backup LSP

  • Requirement 2: Avoid passing through different access rings


Existing solutions and challenge

Existing Solutions and Challenge

  • Existing Solutions

    • Solution 1: To set reasonable link cost

    • Solution 2: To use explicit-path or affinity property(Color)

  • Challenge

    • It will be very complex and time-consuming to adjust the cost for a large scale network or change explicit path or affinity property for a great deal of MPLS TE tunnels.


Architecture of mpls te auto path computation concept of ta tl

Architecture of MPLS TE Auto Path Computation: Concept of TA/TL

TL3/TA0

RSG

RSG

TL3/TA0

Layer3

  • Concept of TA/TL

  • TL (TE Layer): It indicates the physical layer of the node in the network.

  • TA (TE Area): It indicates the physical ring of the node.

  • TL and TA are defined for MPLS TE path

  • computation according to the natural

  • topology of the mobile network.

  • IGP Flooding TA/TL Info

  • TL and TA information are flooded and installed into TEDB.

Aggregate Ring 1

TL2/TA0TA3

AGG

TL2/TA0TA1TA2

AGG

Layer2

AGG

TL2/TA0TA1TA2TA3

Access

Ring 3

Access

Ring 2

TL1/TA3

CSG

TL1/TA1

CSG

Access

Ring 1

Layer1

TL1/TA2

CSG

TL1/TA1

CSG


Architecture of mpls te auto path computation enhanced cspf algorithm

Architecture of MPLS TE Auto Path Computation: Enhanced CSPF Algorithm

TL3/TA0

RSG

RSG

TL3/TA0

Layer3

  • Rules for Enhanced CSPF Algorithm

  • Rule1: If the destination node of the LSP is not in the same TA as the source node or the passed node, the node in the different layer will be the potential next-hop.

  • Rule2: One LSP's TL track can not include TLh->TLl->TLh, this means that the LSP cannot pass through the low layer twice.

  • Rule3: If the LSP reach a node that in the same TA as the destination node, the LSP must be calculated in this TA only.

  • Rule 4: If the LSP reach a node that among more than one TAs, the node in different TA should be prior to be the next hop.

  • Rules for Determining Primary/Secondary LSP

  • Rule 5: The LSP which passes fewer TLs will be the primary LSP.

  • Rule 6: If the two LSPs passes the same TLs, the one with shorter metric in every layer from high to low will be the main LSP

Aggregate Ring 1

TL2/TA0TA3

AGG

TL2/TA0TA1TA2

AGG

Layer2

AGG

TL2/TA0TA1TA2TA3

Access

Ring 3

Access

Ring 2

TL1/TA3

CSG

TL1/TA1

CSG

Access

Ring 1

Layer1

TL1/TA2

CSG

TL1/TA1

CSG


Ospf extensions ta tlv and tl tlv

OSPF Extensions: TA TLV and TL TLV

0 1 2 3

0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| Type | Length |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| TE-Area number |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

// //

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| TE-Area number N |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| Type | Length |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| TE-Layer number |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

  • Elements of Procedure

  • The OSPF TA and TL TLV is carried within the OSPF Routing Information LSA.

  • The TA TLV and TL TLV may be advertised within an Area-local or Routing-domain scope Router Information LSA, depending on the MPLS TE profile.


Zhenbin li li zhang yuanjiao liu huawei technologies ietf 86 orlando fl usa

Next Steps

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