Juniper JN0-363 - Service Provider Routing and Switching, Specialist (JNCIS-SP)

To test connectivity to a server from within a specific routing instance, you use the ping command along with the routing-instance option to specify the routing instance from which you are pinging. This is necessary because the routing table associated with vr3 is separate from the main routing table, and you must explicitly tell the device to use the vr3 routing table to reach the server.

The exhibit shows that the Label Switched Path (LSP) is down. One common reason for this could be that the IGP is not providing traffic engineering information to the MPLS process. Since the exhibit shows the OSPF configuration, enabling traffic engineering extensions for OSPF would allow OSPF to distribute the labels and traffic engineering information necessary for LSP establishment.

References

Juniper Networks Technical Documentation on MPLS and OSPF

To create connections between routing instances on the same Junos device and route between them, you can use logical tunnel interfaces, which are virtual interfaces that can be used to route traffic between instances without the need for physical connectivity. Additionally, loopback interfaces, which represent the device itself, can be used to route traffic between routing instances as they are always up and can be reached within the device.

References

Juniper Networks Technical Documentation on Routing Instances

Juniper Networks Technical Documentation on Logical Tunnel Interfaces

The exhibit shows that the BGP session state is "Active," which generally indicates that the router is trying to establish a BGP session but has not received a response. One common cause for this issue is that there is no route to the BGP neighbor's address. Since the routers are using internal BGP (iBGP) and they are in the same AS, the AS number does not need to be unique, and a next-hop self policy is not strictly required for iBGP. The router-id is usually automatically determined and does not need to be explicitly set.

The FE80::/10 prefix is reserved for IPv6 link-local addresses. These addresses are auto-configured on all IPv6-enabled interfaces and can be used for communication within the local link (subnet) only.

References

Juniper Networks Technical Documentation on IPv6 Addressing