PE1 and PE2 provide a BGP-signaled VPLS service named VPN Blue. PE1 has site ID 2, label base 2500, and label offset 1. PE2 has site ID 4, label base 3000, and label offset 1. Which label does PE2…

The correct answer is D. 3001. TX=remote base label+local site ID-remote offest RX= local base labe+remote site ID-local offset So, PE2 should be expecting to receive 3001 (3000+2-1) and it should be transmitting 2503 (2500+4-1)

MPLS Layer 2 VPNs

Question

PE1 and PE2 provide a BGP-signaled VPLS service named VPN Blue. PE1 has site ID 2, label base 2500, and label offset 1. PE2 has site ID 4, label base 3000, and label offset 1. Which label does PE2 expect to receive on VPLS VPN Blue traffic received from PE1 site ID 2?

Options

A2505
B5499
C2503
D3001

How the community answered

(36 responses)

A
11% (4)
B
3% (1)
C
3% (1)
D
83% (30)

Explanation

TX=remote base label+local site ID-remote offest RX= local base labe+remote site ID-local offset So, PE2 should be expecting to receive 3001 (3000+2-1) and it should be transmitting 2503 (2500+4-1)

Topics

#VPLS BGP signaling#label base#label offset#site ID calculation

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