zebra: bugfix of error quit of zebra, due to no nexthop ACTIVE

There exists some rare situations where fpm will attempt
to send a route update with no valid nexthops.  In that
case an assert would be hit.  This is not good for
trying to keep your routing daemons up and running
when we can safely just recover the situation.

Fixes #7588
Signed-off-by: batmancn <batmanustc@gmail.com>
<fixed commit message, and used zlog_err>
Signed-off-by: Donald Sharp <sharpd@nvidia.com>
(cherry picked from commit 5306e6cf00c58a4c4558609d623ecbbd79faabf1)

diff --git a/zebra/zebra_fpm.c b/zebra/zebra_fpm.c
index 4144c0afe06e6211baf57911fcce4985b9df9007..eff17202bcae439594b390c26923c9b465ec50ec 100644 (file)
--- a/zebra/zebra_fpm.c
+++ b/zebra/zebra_fpm.c
@@ -990,7 +990,6 @@ static int zfpm_build_route_updates(void)
                        data_len = zfpm_encode_route(dest, re, (char *)data,
                                                     buf_end - data, &msg_type);
 
-                       assert(data_len);
                        if (data_len) {
                                hdr->msg_type = msg_type;
                                msg_len = fpm_data_len_to_msg_len(data_len);
@@ -1001,6 +1000,9 @@ static int zfpm_build_route_updates(void)
                                        zfpm_g->stats.route_adds++;
                                else
                                        zfpm_g->stats.route_dels++;
+                       } else {
+                               zlog_err("%s: Encoding Prefix: %pRN No valid nexthops",
+                                        __func__, dest->rnode);
                        }
                }