VSX: Split
This document showcases a complete inter-switch-link (ISL) link failure scenario where both of the ISL links between spine switches goes down.
The following is a visualization of a disconnected ISL link and how the traffic pattern would look:
The following is expected in this scenario:
- After disconnecting both ISL links and
keepaliveis up and properly configured, the VSX secondary switch should put all its MCLAGs intolacp-blockedstate and traffic should only flow through VSX primary. - VSX primary switch should continue to operate without any problems.
- If traffic was originally flowing through secondary VSX member, a small percentage of packets may be dropped when disconnecting the ISL. A sub second value is expected during this event.
- When connecting back ISL link, the hashing needs to be recalculated and some packets may be dropped during this event as well. A sub second value is expected during this event.