1. PCE CC: Load Balancing Use Case
Artem Rachitskiy, MTS Belarus
Anton Gulida, MTS Belarus
Boris Khasanov, Huawei

2. Mobile TeleSystems Belarus
The largest mobile operator in Belarus
Over 5M mobile subscribers (>55% of population)
The only LTE provider in Belarus for the moment
Services offered:
Mobile (2G, 3G, 4G)
FTTx
IPTV
Mobile Backhaul Network (MBH)
20G between aggregation devices
Plenty of L2 rings on access
1G for FTTx subscribers
Technologies:
VPLS-based aggregation layer
LDP, RSVP signaling
MPLS TE tunnels for VPLS peering
Hot/standby failover for TE with multiple explicit paths

3. MBH diagram Where are we going? >70 tunnels at the moment
>140 explicit paths
At least 4 new TE paths per new device
Where are we going?

4. Problems Inefficient link utilization Manual provisioning
Impossible to provide time-based (scheduled) bandwidth reservations
No flexibility for placing Service Routers in the network
Hard to load balance traffic amongst different TE tunnels

5. PCECC usage for LB Establish PCEP Sessions
SDN controller
PCECC
Operator APP
NBI
1. PC Open (with PCECC capablity)
2.Path calculation, Label allocation
3. Add LSP
4. Label Forwarding Entry Download
5. Update LSP&RIB, LB traffic
PCEP sessions
PCEP messages
AGGN+1
VLAN
Access
Sub ring 1
ring 1
AGG1
Core PE
AGG
AGG3
AGG N-1
AGG N
EPC
Establish PCEP Sessions
Connect from PCE to each router
Do label resource allocation & LSP DB synchronization with all nodes
Collect information about state of the network
New connectivity created as required
PCE requests ingresses to add LSPs using control plane or
Program labels at each node along the path
PCE sends update message to PCC to ingresses
Activate the LSPs and say what they are to be used for
AGG Transport LSP
Core LSP

6. Next steps
PCECC based solution for our use case requires answers to the following questions:
SDN controller (PCECC) performance has to be good enough to handle centralized control plane for the whole network
Additional research, testing and measurements are needed
The SDN controller (PCECC) cannot be single point of failure
Realization of the controller should satisfy redundancy, and recovery requirements
Network operator must have control and visibility
Right application should be developed

7. Thank you!