This object counts the number of outgoing packets forwarded for this specific transit tunnel after the label swap, and as the description notes, is only supported on certain platforms. Comparing this against cienaCesMplsStaticTransitTunnelIncomingPackets on the same row reveals whether this transit hop is silently dropping a portion of the LSP's traffic internally, since a healthy transiting LSP should show incoming and outgoing packet counts tracking closely together over time. For example, an incoming counter climbing steadily while the outgoing counter on the same row stays flat indicates this specific router is dropping transit traffic for this tunnel rather than the problem lying elsewhere in the path.