Somewhat unlikely to see on the wire, but it could happen :-)

As per IANA Early Allocation
https://www.iana.org/assignments/bgp-parameters/bgp-parameters.xhtml#bgp-parameters-3

OK?

Index: print-bgp.c
===================================================================
RCS file: /cvs/src/usr.sbin/tcpdump/print-bgp.c,v
diff -u -p -r1.32 print-bgp.c
--- print-bgp.c	25 May 2022 16:21:11 -0000	1.32
+++ print-bgp.c	17 Feb 2024 10:35:35 -0000
@@ -211,6 +211,7 @@ static const char *bgpnotify_major[] = {
 	"OPEN Message Error", "UPDATE Message Error",
 	"Hold Timer Expired", "Finite State Machine Error",
 	"Cease", "ROUTE_REFRESH Message Error",
+	"Send Hold Timer Expired",
 };
 #define bgp_notify_major(x) \
 	num_or_str(bgpnotify_major, \