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zebra: Add show cmd to display all routes which use a NHG

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Adding a new entry to the existing show command
"show nexthop-group rib <ID> routes" which will
walk all the re's which uses that particular NHG and displays the route
node, protocol and the installed status.

Examples:

r1# sh nexthop-group rib 39 routes
Routes using nexthop group 39:
Route Entry                    Status      Protocol
------------------------------ ----------- --------
fc00::/64                      installed   connected
fc00::1/128                    installed   local
4:5::6:12/128                  installed   static

r1# sh nexthop-group rib 15 routes
Routes using nexthop group 15:
Route Entry                    Status      Protocol
------------------------------ ----------- --------
192.168.4.0/26                 installed   connected
192.168.4.1/32                 installed   local
1.1.1.4/32                     installed   static

Signed-off-by: Rajasekar Raja <rajasekarr@nvidia.com>
This commit is contained in:
Rajasekar Raja 2025-04-09 15:46:47 -07:00
parent 8dee7cf3e5
commit 4e0ba30515
2 changed files with 64 additions and 6 deletions
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6
doc/user/zebra.rst
View file

@ -1567,7 +1567,7 @@ zebra Terminal Mode Commands
total number of route nodes in the table. Which will be higher than
the actual number of routes that are held.
.. clicmd:: show nexthop-group rib [ID] [vrf NAME] [singleton [ip|ip6]] [type] [json]
.. clicmd:: show nexthop-group rib [ID [routes]] [vrf NAME] [singleton [ip|ip6]] [type] [json]
Display nexthop groups created by zebra. The [vrf NAME] option
is only meaningful if you have started zebra with the --vrfwnetns
@ -1578,7 +1578,9 @@ zebra Terminal Mode Commands
that has `Initial Delay`, means that this nexthop group entry
was not installed because no-one was using it at that point and
Zebra can delay installing this route until it is used by something
else.
else. [routes] option after the NHG ID will show all the routes using
a particular NHG.
.. clicmd:: show <ip|ipv6> zebra route dump [<vrf> VRFNAME]

64
zebra/zebra_vty.c
View file

@ -1435,11 +1435,12 @@ DEFPY (show_interface_nexthop_group,
DEFPY(show_nexthop_group,
show_nexthop_group_cmd,
"show nexthop-group rib <(0-4294967295)$id|[singleton <ip$v4|ipv6$v6>] [<kernel|zebra|bgp|sharp>$type_str] [vrf <NAME$vrf_name|all$vrf_all>]> [json]",
"show nexthop-group rib <(0-4294967295)$id [routes$routes]|[singleton <ip$v4|ipv6$v6>] [<kernel|zebra|bgp|sharp>$type_str] [vrf <NAME$vrf_name|all$vrf_all>]> [json]",
SHOW_STR
"Show Nexthop Groups\n"
"RIB information\n"
"Nexthop Group ID\n"
"Show routes using this nexthop group\n"
"Show Singleton Nexthop-Groups\n"
IP_STR
IP6_STR
@ -1450,19 +1451,74 @@ DEFPY(show_nexthop_group,
VRF_FULL_CMD_HELP_STR
JSON_STR)
{
struct zebra_vrf *zvrf = NULL;
afi_t afi = AFI_UNSPEC;
int type = 0;
bool uj = use_json(argc, argv);
json_object *json = NULL;
json_object *json_vrf = NULL;
struct route_entry *re = NULL;
if (uj)
json = json_object_new_object();
if (id)
return show_nexthop_group_id_cmd_helper(vty, id, json);
if (id) {
struct nhg_hash_entry *nhe = zebra_nhg_lookup_id(id);
if (!nhe) {
vty_out(vty, "%% Can't find nexthop group %lu\n", id);
return CMD_WARNING;
}
if (routes) {
if (uj) {
json_object *json_routes = json_object_new_array();
frr_each (nhe_re_tree, &nhe->re_head, re) {
json_object *json_route = json_object_new_object();
char buf[PREFIX_STRLEN];
const char *proto_name;
prefix2str(&re->rn->p, buf, sizeof(buf));
proto_name = zebra_route_string(re->type);
json_object_string_add(json_route, "prefix", buf);
json_object_boolean_add(json_route, "installed",
CHECK_FLAG(re->flags,
ZEBRA_FLAG_SELECTED));
json_object_string_add(json_route, "protocol", proto_name);
json_object_array_add(json_routes, json_route);
}
json_object_object_add(json, "routes", json_routes);
vty_json(vty, json);
} else {
vty_out(vty, "Routes using nexthop group %lu:\n", id);
vty_out(vty,
"Route Entry Status Protocol\n");
vty_out(vty,
"------------------------------ ----------- --------\n");
frr_each (nhe_re_tree, &nhe->re_head, re) {
char buf[PREFIX_STRLEN];
const char *proto_name;
prefix2str(&re->rn->p, buf, sizeof(buf));
proto_name = zebra_route_string(re->type);
vty_out(vty, "%-30s %-11s %s\n", buf,
CHECK_FLAG(re->flags, ZEBRA_FLAG_SELECTED)
? "installed"
: "not installed",
proto_name);
}
}
return CMD_SUCCESS;
}
show_nexthop_group_id_cmd_helper(vty, id, uj ? json : NULL);
return CMD_SUCCESS;
}
if (v4)
afi = AFI_IP;