1. Vach Kompella Joe Regan Ron Haberman Alcatel-Lucent
Regional VPLS
Vach Kompella
Joe Regan
Ron Haberman
Alcatel-Lucent

2. Problem: Scaling a VPLS
Flat architecture
Too many end-to-end sessions
Too much replication
Few labels
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3. More on Scaling Hierarchical VPLS Reduces end-to-end sessions
Reduces replication
Too many MACs learned at n-PE
More labels
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4. More on Scaling Use MS-PWs Reduces number of sessions
Keeps MAC address learning to minimum
Too much replication
Many more labels
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5. What Have We Learned Four important dimensions of scaling Sessions
Replication
MAC address learning
Labels
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6. Regional VPLS Use MS-PW for scaling sessions
Use hierarchy to scale replication
Use hierarchy to reduce labels
Use regional labels to reduce MAC address learning
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7. Regional VPLS Model Full-FIB Regional PE Half-FIB
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8. New Concepts
Regional PE: a dual nature PE which behaves like an S-PE to the core and nPE to the region
Half-FIB: a FIB of local MAC addresses learned from the region
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9. R-VPLS Operation - ForwardM1
Flood M2
Learn M1 at PE1
Flood M2
PE1
Learn M1 is Blue
PE2
Blue
Green
RPE1
RPE2
RPE3
Flood M2 M2
Red
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10. R-VPLS Operation – Optimized Flooding
Flood M2 using Flood PW
Learn M1 at PE1
Flood M2
PE1
Learn M1 is Blue
PE2
Blue
Green
RPE1
RPE2
RPE3
Flood M2 M2
Red
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11. R-VPLS Operation - ReverseM1
Learn M2 is Green
Forward M1
on Blue PW
PE1
Forward M1 to PE1
Blue
PE2
Green
RPE1
RPE2
RPE3
Learn M2 at PE2 M2
Red
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12. RVPLS Operation - Unicast
Forward to M2
on Green PW M1
PE1
Forward on Green PW
PE2
Blue
Green
RPE1
RPE2
RPE3
Forward M2 to PE2 M2
Red
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13. Advantages of R-VPLS Optimized flooding Fewer pseudowires
Fewer sessions
Small number of labels
Limited MAC learning at nPEs
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14. Next Steps Auto-discovery Dual homing of RPEs Cascaded regions
Quantifying the scaling advantages
Wait for re-charter to ask for consensus as WG draft
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