man: ip-route.8: Document nexthop limit

Add a note to 'nexthop' description stating the maximum number of
nexthops per command and pointing at 'append' command as a workaround.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>

diff --git a/man/man8/ip-route.8.in b/man/man8/ip-route.8.in
index a33ce1f0f40066415a9636acfcd6f921323ba1be..11dd4ca7abf68d8e393bd74e3018bb555172f496 100644 (file)
--- a/man/man8/ip-route.8.in
+++ b/man/man8/ip-route.8.in
@@ -589,6 +589,15 @@ argument lists:
 route reflecting its relative bandwidth or quality.
 .in -8
 
+The internal buffer used in iproute2 limits the maximum number of nexthops that
+may be specified in one go. If only
+.I ADDRESS
+is given, the current buffer size allows for 144 IPv6 nexthops and 253 IPv4
+ones. For IPv4, this effectively limits the number of nexthops possible per
+route. With IPv6, further nexthops may be appended to the same route via
+.B "ip route append"
+command.
+
 .TP
 .BI scope " SCOPE_VAL"
 the scope of the destinations covered by the route prefix.