A community-college host cannot reach a shared service in another V…

Question

A community-college host cannot reach a shared service in another VN even though underlay ping between locators works. Which overlay troubleshooting focus is most appropriate?

Accepted Answer

Inspect LISP map-cache / map-resolution state for the destination EID because overlay reachability can fail independently of underlay locator ping. — If the roads between switches are fine but the destination still looks unknown, your phone book entry is probably missing. That phone book is LISP map-cache / map resolution for the EID. Underlay ping only proves locator reachability—it does not guarantee the overlay knows where the shared service lives.

Answer

Immediately replace the underlay IGP with static routes between all access VLANs.

Answer

Disable VXLAN campus-wide and bridge the two VNs at Layer 2 on the core.

Answer

Clear all AAA sessions globally before checking any fabric mapping tables.

A community-college host cannot reach a shared service in another VN even though underlay ping between locators works. Which overlay troubleshooting focus is most appropriate?

Short Explanation

Full Explanation