netdev - [iproute PATCH v2] man: ip-route.8: Document nexthop limit

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Date:   Tue, 13 Nov 2018 16:55:13 +0100
From:   Phil Sutter <phil@....cc>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev@...r.kernel.org, David Ahern <dsahern@...il.com>
Subject: [iproute PATCH v2] 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>
---
Changes since v1:
- Reviewed text.
- 'route append' trick works with IPv6 only.
---
 man/man8/ip-route.8.in | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/man/man8/ip-route.8.in b/man/man8/ip-route.8.in
index a33ce1f0f4006..11dd4ca7abf68 100644
--- 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.
-- 
2.19.0