Use Case of I2RS in Mobile Backhaul
Network
draft-zhang-i2rs-mbb-usecase-00
Li Zhang, Zhenbin Li (Huawei Technologies)
Dapeng Liu (China Mobile)
IETF 88, Vancouver,BC, Canada
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Service Requirements for MBB Configuration
Last Mile
Access
Aggregation
RNC/SGW/MME
CSG
ATN
BTS
CSG
E1
BSC
RSG
AGG
ATN
CSG
ATM
ATN
PE
NodeB
Eth.
CSG
NodeB / eNB
P
PE
AGG
RSG
STM-1
ATM RNC
CSG
ATN
ATN
TDM/ATM Application
2G TDM PW
IP RNC/S-GW/MME
E2E PWE3
Multi-segment PWE3
HVPN
E2E L3VPN
Protection mechanism
3G ATM PW
3G ETH VRF
Route Policy
Network Monitoring
LTE VRF S1
LTE VRF X2
Ethernet Application
Seamless
MPLS
MPLS LDP
MPLS TE
MPLS TP
 Multiple Applications across 2G to LTE, various network architectures, different service carriers make MBB configuration
more arduous
 Traditional configuration and diagnoses mechanisms base on device-level management tools and manual processing are illsuited to meet the requirements of today‘s scalable, flexible, and complex mobile backhaul network.
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Usecase1: Application configuration
Challenges
 various radio access modes: TDM/ATM-based and IP-based across 2G to 5G
 various radio applications: OM, voice, data, video with different SLAs
 various network architectures: multiple IGP areas and AS
Flexible Configuration
 where the T-LDP should be configured, where the BGP peer should be
established, where the VPN instance should be deployed, and where the
BGP LSP should be set up
I2RS Requirements
 Store a global mobile backhaul network solution provisioning information
in a central location
 Distribute MBB configuration from the central location automatically
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Usecase2: Route Policy Enforcement
Route policy focus on:
 Avoiding route advertisement across entire network
 supporting best route selection for VPN FRR or ECMP
 allowing On-demand route advertisement
Dynamic enforcement
 Different network devices has individual route policy details in a networkwide route policy
I2RS requirements:
 Use common APIs to collect network information dynamically
 Push route policy centralized and automatically
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Usecase3: Service Tunnel Implementation
Service tunnel types:
 MPLS LDP LSP: DU, DoD, Longest length match, policy for LSP control
 MPLS-TE LSP: multiple path control attributes and multiple protection modes
 MPLS-TP LSP: multiple LSP types, static LSP is need in MBB
Hierarchical deployment
 service tunnel implementation is not constant and unique across
access/aggregate/core network in MBB
 kinds of LSPs could be used separately or simultaneously in the whole MBB
I2RS requirements:
 Acquire the ability of network devices automatically
 Get the requirements of services on control plane to calculate and set up the
LSP centrally.
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Usecase4: Protection Mechanism
Hierarchical Protection Mechanism :
 tunnel protection : LDP FRR (LFA, Remote-LFA, MRT, e.g.), MPLS-TE LSP HSB
and TE FRR, MPLS-TP LSP Line or ring protection
 service protection : dual-homing attachment is suitable with PW Redundancy
and VPN FRR or VPN ECMP
Flexible design
 Selection of service and tunnel, as well as the protection mode
I2RS requirements:
 Get the whole information about tunnel and service
 Control and manage protection design centrally
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Usecase5: Network Monitoring
Multiple monitoring tools:
 Tools: Different monitoring tools for different monitoring objects, such as
NQA, MPLS-TP OAM, IPFPM
 Traffic path: get exact traffic path is useful for point-to-point detection
Accurate deployment
 Deploy appropriate monitoring tools and accurate detection
I2RS requirements:
 Get and store the entire topology and routing information centralized
 Calculate and store the traffic path naturally
 Deploy accurate network monitoring tools automatically
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Next Steps
• Solicit comments and feedback
• Revise the draft
IETF 88 I2RS
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