Click the Exhibit button. The routers shown in the exhibit are configured for segment routing. In this scenario, what is the adjacency SID that Router B advertises to Router A?
Shloud be answer B
Currently, Junos OS enables you to configure a SPRING node SID for IPv4 and IPv6 address families for each routing instance. This node SID is attached to an IPv4 and IPv6 router ID if the router ID is configured on the loopback interface. Otherwise, the lowest IP address assigned to the loopback interface is chosen as the node SID. Configuring a node SID through policy allows you to choose the loopback address that gets the node SID. If the node SID configuration exists and a policy is defined for node SID selection for the same prefix, then the policy configuration takes precedence.
As others have indicated. The adjacency SID that Router B advertises to Router A in a segment is determined in this scenario by the MPLS label indicated in the exhibit. so the Answer is D. I don't know why there are so many upvotes on the wrong answer.......
The adjacency SID in segment routing is advertised by one router to inform another about the label that should be used to forward traffic to it over a particular link. In this scenario, Router B would advertise an adjacency SID to Router A, which would be usedby Router A to forward traffic to Router B. Based on the exhibit, the adjacency SID that Router B advertises to Router A would be 12.
References: Juniper Networks documentation on Segment Routing: Segment Routing Overview
The adjacency SID (Segment Identifier) that Router B advertises to Router A in a segment routing configuration is indicated by the MPLS label associated with the link as seen from Router B's perspective. According to the diagram, Router B is associated with the MPLS label 12 for the link between Router A and Router B.
Therefore, the adjacency SID that Router B advertises to Router A is:
D. 12
should b letter A because image mentioned that labels are 11 and 12 because adjancency SID are dinamically assigned. It is not related with loopback(node SID). So finally if some device wants send packets to Router B must has label 11 in stack. This label was advertised by Router B in IGP.
zineeddine Highly Voted 6 months, 2 weeks ago
Shloud be answer B
Currently, Junos OS enables you to configure a SPRING node SID for IPv4 and IPv6 address families for each routing instance. This node SID is attached to an IPv4 and IPv6 router ID if the router ID is configured on the loopback interface. Otherwise, the lowest IP address assigned to the loopback interface is chosen as the node SID. Configuring a node SID through policy allows you to choose the loopback address that gets the node SID. If the node SID configuration exists and a policy is defined for node SID selection for the same prefix, then the policy configuration takes precedence.
upvoted 2 times
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