An engineer is troubleshooting a connectivity issue across the MPLS network and is verifying the forwarding behavior of packets. Which table does the engineer look at to verify the forwarding behavior

The correct answer is D. FIB. FIB as edge LSR is the LER. LER will check the fib for the IP packet and if it needs to go via LSP there will be an entry for the Label. All in between LSRs will check the LFIB.

MPLS and Segment Routing

Question

An engineer is troubleshooting a connectivity issue across the MPLS network and is verifying the forwarding behavior of packets. Which table does the engineer look at to verify the forwarding behavior of an IP packet as it enters the MPLS network at the ingress LSR?

Options

ALFIB
BLIB
CRIB
DFIB

How the community answered

(32 responses)

A
3% (1)
B
3% (1)
C
6% (2)
D
88% (28)

Explanation

FIB as edge LSR is the LER. LER will check the fib for the IP packet and if it needs to go via LSP there will be an entry for the Label. All in between LSRs will check the LFIB.

Topics

#MPLS forwarding#Ingress LSR#FIB#IP-to-MPLS

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