From 03f781f7e106185c3a8a9bbadce60b87e8282720 Mon Sep 17 00:00:00 2001
From: Siyuan <siyuan@buildjet.com>
Date: Thu, 6 Nov 2025 15:52:37 +0000
Subject: [PATCH] chore: skip TLV end check for LLDP shutdown frame

---
 internal/lldp/rx.go | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/internal/lldp/rx.go b/internal/lldp/rx.go
index fbb38b4e..7ccb1033 100644
--- a/internal/lldp/rx.go
+++ b/internal/lldp/rx.go
@@ -248,14 +248,11 @@ func (l *LLDP) handlePacketLLDP(mac string, raw *layers.LinkLayerDiscovery, info
 		Source: "lldp",
 		Mac:    mac,
 	}
-	gotEnd := false
 
 	ttl := lldpDefaultTTL
 
 	for _, v := range raw.Values {
 		switch v.Type {
-		case layers.LLDPTLVEnd:
-			gotEnd = true
 		case layers.LLDPTLVChassisID:
 			n.ChassisID = string(raw.ChassisID.ID)
 			n.Values["chassis_id"] = n.ChassisID
@@ -292,7 +289,10 @@ func (l *LLDP) handlePacketLLDP(mac string, raw *layers.LinkLayerDiscovery, info
 		}
 	}
 
-	if gotEnd || ttl < 1*time.Second {
+	// delete the neighbor if the TTL is less than 1 second
+	// LLDP shutdown frame should have a TTL of 0 and contains mandatory TLVs only
+	// but we will simply ignore the TLVs check for now
+	if ttl < 1*time.Second {
 		l.deleteNeighbor(n)
 	} else {
 		l.addNeighbor(n, ttl)