This object reports how many link-state advertisements are currently sitting in the retransmission queue for this sham link neighbor, LSAs that have been sent but not yet acknowledged by the far end. It matters as a direct measure of adjacency health under load: a consistently non-zero or growing queue length indicates the neighbor is not acknowledging LSAs promptly, which could mean packet loss on the underlying MPLS VPN path or the neighbor router being overloaded. An admin seeing this queue length climb steadily rather than draining back toward zero should suspect the sham link's underlying transport is dropping packets or the remote router is struggling to keep up.