300-510 Exam Dumps | Refer to the exhibit. The network is situated at different locations on the customer site. The customer

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Question 85

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Question 85/142

Refer to the exhibit. The network is situated at different locations on the customer site. The customer runs a mission-critical application behind CE2, which is connected over a 10 GB link to the local network of the customer. After recent configuration changes to the P and PE routers, an LSP failure has occurred, causing connectivity issues. CE1 is unable to reach the CE2 internal IP address.
Which action resolves this issue?

A. Configure the ip ospf network point-to-point command on PE2.

B. Change the subnet mask on the PE2 loopback interface from /24 to /32.

C. Configure the ip ospf network point-to-multipoint command on PE2.

D. Implement BGP in the core and configure an MPLS TE tunnel between PE1 and PE2.

Correct Answer: B

The PE2 loopback address (33.33.33.1) is being used as the LDP (Label Distribution Protocol) router ID. The subnet mask for the loopback interface is /24, causing issues with label allocation and distribution. MPLS LDP requires loopback interfaces to be configured with a /32 mask to uniquely identify routers and ensure proper label distribution.
Changing the PE2 loopback address mask to /32 ensures it is uniquely advertised and reachable throughout the MPLS core. This allows the correct label (33.33.33.1/32) to be bound and distributed, fixing the LSP issue and restoring end-to-end connectivity.

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