What is the cause of the failure?

Refer to the exhibit.

Eth 1/1 of SONiC-1 and Eth1/56 of SONiC-2 should be a routed link connecting the two Enterprise SONiC switches. No traffic is passing between them.

What is the cause of the failure?
A . An incorrect IPv6 address type was used for interface Eth1/56 of SONiC-2.
B . A spanning-tree is blocking the routed link.
C . IPv6 is not enabled on interface Eth 1/1 of SONiC-1.
D . There is a cable that is unplugged between SONiC-1 and SONiC-2.

View Answer

Answer: A

Explanation:

From the exhibit, it is evident that Eth1/56 on SONiC-2 is assigned a link-local IPv6 address (fe80::e7d:8aff:fecb /64). Link-local addresses are not routable beyond the local network segment, which means they cannot be used to route traffic between SONiC-1 and SONiC-2. For routed links, global unicast addresses must be used.

References:

Dell Technologies SONiC documentation

IPv6 Addressing Guide