You are testing the capabilities of MPLS OAM ping. Which statement is true?

The correct answer is D. An LSP is not required for the reply to reach the ingress MPLS router. An MPLS echo reply is sent in response to an MPLS echo request. The reply is sent as an IP packet and it is forwarded using IP, MPLS, or a combination of both types of switching. Head-end router will receive an echo-reply from the last router (before the broken binding), and that

MPLS and Segment Routing

Question

Options

AMPLS OAM ping works solely with Cisco MPLS TE
BMPLS OAM ping works solely with P2P LSPs
CAn LSP breakage results in the ingress MPLS router never receiving any reply
DAn LSP is not required for the reply to reach the ingress MPLS router

How the community answered

(51 responses)

A
2% (1)
B
4% (2)
C
6% (3)
D
88% (45)

Explanation

An MPLS echo reply is sent in response to an MPLS echo request. The reply is sent as an IP packet and it is forwarded using IP, MPLS, or a combination of both types of switching. Head-end router will receive an echo-reply from the last router (before the broken binding), and that reply will be: 'U' - unreachable.

Topics

#MPLS OAM#LSP Ping#MPLS Troubleshooting#MPLS Operations

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