netdev - [iproute PATCH] man: ip-route.8: Document nexthop limit

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Message-Id: <20181112222101.9674-1-phil@nwl.cc>
Date:   Mon, 12 Nov 2018 23:21:01 +0100
From:   Phil Sutter <phil@....cc>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev@...r.kernel.org
Subject: [iproute PATCH] 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@....cc>
---
 man/man8/ip-route.8.in | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/man/man8/ip-route.8.in b/man/man8/ip-route.8.in
index a33ce1f0f4006..383178c11331e 100644
--- a/man/man8/ip-route.8.in
+++ b/man/man8/ip-route.8.in
@@ -589,6 +589,13 @@ argument lists:
 route reflecting its relative bandwidth or quality.
 .in -8
 
+The internal buffer used in iproute2 limits the maximum number of nexthops to
+be specified in one go. If only a gateway address is given, the current buffer
+size allows for 144 IPv6 nexthops and 253 IPv4 ones. If more are required, they
+may be added to the existing route using
+.B "ip route append"
+command.
+
 .TP
 .BI scope " SCOPE_VAL"
 the scope of the destinations covered by the route prefix.
-- 
2.19.0