Router Nexthop
nv show router nexthop
Shows information about the next hops in the RIB, such as the IP address, VRF, interface, type, and so on.
Add -o json at the end of the command to see the output in a more readable format.
Version History
Introduced in Cumulus Linux 5.0.0
Example
cumulus@switch:~$ nv show router nexthop -o json
{
"rib": {
"29": {
"address-family": "ipv4",
"installed": "on",
"interface-index": 1,
"ref-count": 2,
"resolved-via": {
"lo": {
"flags": {
"active": {},
"directly-connected": {},
"installed": {}
},
"type": "interface",
"vrf": "default"
}
},
"type": "zebra",
"valid": "on",
"vrf": "default"
},
"30": {
"address-family": "ipv4",
"installed": "on",
"interface-index": 2,
"ref-count": 2,
"resolved-via": {
"eth0": {
"flags": {
"active": {},
"directly-connected": {},
"installed": {}
},
"type": "interface",
"vrf": "mgmt"
}
},
"type": "zebra",
"valid": "on",
"vrf": "default"
},
"31": {
"address-family": "ipv4",
"interface-index": 65,
"ref-count": 2,
"resolved-via": {
"vlan30v0": {
"flags": {
"active": {},
"directly-connected": {},
"installed": {}
},
"type": "interface",
"vrf": "BLUE"
}
...
nv show router nexthop group
Shows the next hop groups in the RIB. Next hop groups are a way to encapsulate ECMP information together.
You must use --applied with this command to show the output.
Version History
Introduced in Cumulus Linux 5.0.0
Example
cumulus@switch:~$ nv show router nexthop group --applied
No Data
nv show router nexthop group <nexthop-group-id>
Shows information about the specified next hop group in the RIB.
Cumulus Linux 5.4 and later no longer provides this command.
Command Syntax
| Syntax | Description |
|---|---|
<nexthop-group-id> | The next hop group ID. |
Version History
Introduced in Cumulus Linux 5.0.0
Example
cumulus@switch:~$ nv show router nexthop 1
nv show router nexthop group <nexthop-group-id> via
Shows information about the next hop addresses for the specified next hop group.
Cumulus Linux 5.4 and later no longer provides this command.
Command Syntax
| Syntax | Description |
|---|---|
<nexthop-group-id> | The next hop group ID. |
Version History
Introduced in Cumulus Linux 5.0.0
Example
cumulus@switch:~$ nv show router nexthop 1 via
nv show router nexthop group <nexthop-group-id> via <via-id>
Shows details of a particular next hop group specified by the next hop address.
Cumulus Linux 5.4 and later no longer provides this command.
Command Syntax
| Syntax | Description |
|---|---|
<nexthop-group-id> | The next hop group ID. |
<via-id> | The IP address. |
Version History
Introduced in Cumulus Linux 5.0.0
Example
cumulus@switch:~$ nv show router nexthop 10 via fe80::a00:27ff:fea6:b9fe
nv show router nexthop rib
Shows information about the next hops in the RIB, such as the IP address, VRF, interface, type, and so on.
Version History
Introduced in Cumulus Linux 5.4.0
Example
Cumulus Linux 5.8:
cumulus@switch:~$ nv show router nexthop rib
Installed - Install state
ID Installed UpTime Vrf Valid Via ViaIntf ViaVrf Depends
--- --------- -------- ------- ----- ------------------------- ------------- ------- -------
7 on 00:10:43 default on lo default
8 on 00:13:36 default on eth0 mgmt
9 on 00:13:36 default on eth0 mgmt
10 00:10:43 default on
11 on 00:10:43 default on 192.168.200.1 eth0 mgmt
12 on 00:10:43 default on
15 on 00:10:43 default on
30 on 00:10:43 default on
32 on 00:13:33 default on swp53 default
34 00:13:33 default on swp51 default
36 00:13:33 default on swp52 default
38 00:13:33 default on swp54 default
68 00:10:50 default on peerlink.4094 default
76 on 00:10:48 default on fe80::4ab0:2dff:fe59:eedc peerlink.4094 default
88 00:10:46 default on br_default default
89 00:10:46 default on vlan10v0 RED
90 on 00:10:46 default on vlan10 RED
91 00:10:46 default on vlan10v0 RED
92 00:10:46 default on vlan4024_l3 RED
93 00:10:46 default on vlan20 RED
94 on 00:10:46 default on vlan10 RED
95 on 00:10:46 default on vlan20 RED
96 on 00:10:46 default on vlan30 BLUE
97 00:10:46 default on vlan4036_l3 BLUE
98 on 00:10:46 default on vlan30 BLUE
105 00:10:46 default on vlan4024_l3v0 RED
106 00:10:46 default on vlan20v0 RED
107 00:10:46 default on vlan20v0 RED
108 00:10:46 default on vlan30v0 BLUE
109 00:10:46 default on vlan4036_l3v0 BLUE
110 00:10:46 default on vlan30v0 BLUE
113 00:10:41 default on vxlan48 default
115 on 00:01:57 default on fe80::4ab0:2dff:fe3f:44c1 swp51 default
119 on 00:00:48 default on fe80::4ab0:2dff:fe25:2e13 swp52 default
132 on 00:00:48 default on fe80::4ab0:2dff:fe4e:2c21 swp53 default
138 on 00:00:48 default on fe80::4ab0:2dff:fead:9d3f swp54 default
Cumulus Linux 5.4.0 thru 5.7:
cumulus@switch:~$ nv show router nexthop rib
Nexthop-group address-family installed interface-index ref-count type valid vrf Summary
------------- -------------- --------- --------------- --------- ----- ----- ------- ------------------
...
75 ipv4 on 74 2 zebra on default
76 ipv4 on 74 2 zebra on default
77 unspecified on 2 zebra on default Nexthop-group: 78
Nexthop-group: 79
Nexthop-group: 78
Nexthop-group: 79
78 ipv4 on 67 3 zebra on default
79 ipv4 on 67 3 zebra on default
90 ipv6 on 55 8 zebra on default
96 ipv6 on 54 8 zebra on default
108 unspecified on 6 zebra on default Nexthop-group: 109
Nexthop-group: 65
Nexthop-group: 90
Nexthop-group: 96
Nexthop-group: 109
Nexthop-group: 65
Nexthop-group: 90
Nexthop-group: 96
...
nv show router nexthop rib <nhg-id>
Shows information about the specified next hop in the RIB.
Command Syntax
| Syntax | Description |
|---|---|
<nhg-id> | The next hop group ID. |
Version History
Introduced in Cumulus Linux 5.4.0
Example
cumulus@switch:~$ nv show router nexthop rib 140
operational
--------------- --------------------
type zebra
ref-count 3
vrf default
valid on
installed on
interface-index 67
uptime 2024-11-14T09:00:18Z
Via
======
Flags - u - unreachable, r - recursive, o - onlink, i - installed, d -
duplicate, c - connected, A - active, Type - Type of nexthop, Weight - Weight to
be used by the nexthop for purposes of ECMP, VRF - VRF to use for egress.
Nexthop Flags Type Weight VRF Interface
----------- ----- ---------- ------ ---- -----------
10.10.10.63 oiA ip-address 1 BLUE vlan4006_l3
Via BackupNexthops
=====================
No Data
Depends
==========
No Data
Dependents
=============
Nexthop-group
-------------
257
nv show router nexthop rib <nhg-id> depends
Shows information about the next hops on which a specific next hop relies.
Cumulus Linux 5.11 and later no longer provides this command.
Command Syntax
| Syntax | Description |
|---|---|
<nhg-id> | The next hop group ID. |
Version History
Introduced in Cumulus Linux 5.4.0
Example
cumulus@switch:~$ nv show router nexthop rib 55 depends
Nexthop-group
-------------
56
57
nv show router nexthop rib <nhg-id> dependents
Shows information about the next hop dependents on which a specific next hop relies.
Cumulus Linux 5.11 and later no longer provides this command.
Command Syntax
| Syntax | Description |
|---|---|
<nhg-id> | The next hop group ID. |
Version History
Introduced in Cumulus Linux 5.4.0
Example
cumulus@switch:~$ nv show router nexthop rib 56 dependents
Nexthop-group
-------------
55
nv show router nexthop rib <nhg-id> resolved-via
Shows details about the next hop address for a particular next hop.
Cumulus Linux 5.11 and later no longer provides this command.
Command Syntax
| Syntax | Description |
|---|---|
<nhg-id> | The next hop group ID. |
Version History
Introduced in Cumulus Linux 5.4.0
Example
cumulus@switch:~$ nv show router nexthop rib 140 resolved-via
Flags - u - unreachable, r - recursive, o - onlink, i - installed, d -
duplicate, c - connected, A - active, Type - Type of nexthop, Weight - Weight to
be used by the nexthop for purposes of ECMP, VRF - VRF to use for egress.
Nexthop Flags Type Weight VRF Interface
----------- ----- ---------- ------ ---- -----------
10.10.10.63 oiA ip-address 1 BLUE vlan4006_l3
nv show router nexthop rib <nhg-id> resolved-via <resolved-via-id>
Shows details of a particular next hop specified by the next hop IP address.
Cumulus Linux 5.11 and later no longer provides this command.
Command Syntax
| Syntax | Description |
|---|---|
<nhg-id> | The next hop group ID. |
<resolved-via-id> | The next hop IP address. |
Version History
Introduced in Cumulus Linux 5.4.0
Example
cumulus@switch:~$ nv show router nexthop rib 56 resolved-via 10.10.10.63
operational
------------ -----------
type ip-address
weight 1
vrf default
flags-string iA
interface
============
Interface
---------
swp5
nv show router nexthop rib <nhg-id> resolved-via-backup
Shows information about the backup next hops for the specified next hop.
Cumulus Linux 5.11 and later no longer provides this command.
Command Syntax
| Syntax | Description |
|---|---|
<nhg-id> | The next hop group ID. |
Version History
Introduced in Cumulus Linux 5.4.0
Example
cumulus@switch:~$ nv show router nexthop rib 39 resolved-via-backup
No Data
nv show vrf <vrf-id> router nexthop-tracking
Shows the IPv4 and IPv6 next hop tracking information for the specified VRF. Next hop tracking is an optimization feature that reduces the processing time involved in the BGP bestpath algorithm by monitoring changes to the routing table.
Command Syntax
| Syntax | Description |
|---|---|
<vrf-id> | The VRF name. |
Version History
Introduced in Cumulus Linux 5.3.0
Example
cumulus@switch:~$ nv show vrf default router nexthop-tracking
IpAddress - Nexthop ip address, Interface - Resolved via interface,
DirectlyConnected - Indicates if nexthop is directly connected or not,
ProtocolFiltered - Indicates whether protocol filtered or not, Flags - o -
onlink, c - directly-connected, A - active
AFI IpAddress Interface VRF Weight ResolvedProtocol DirectlyConnected ProtocolFiltered Flags
---- ----------- ------------- ------- ------ ---------------- ----------------- ---------------- -----
ipv4 10.0.1.34 swp51 default 1 bgp off off A
swp52 default 1 A
swp54 default 1 A
swp53 default 1 A
10.10.10.2 peerlink.4094 default 1 bgp off off A
10.10.10.3 swp51 default 1 bgp off off A
swp52 default 1 A
swp54 default 1 A
swp53 default 1 A
10.10.10.4 swp51 default 1 bgp off off A
swp52 default 1 A
swp54 default 1 A
swp53 default 1 A
10.10.10.63 swp51 default 1 bgp off off A
swp52 default 1 A
swp54 default 1 A
swp53 default 1 A
10.10.10.64 swp51 default 1 bgp off off A
swp52 default 1 A
swp54 default 1 A
swp53 default 1 A
nv show vrf <vrf-id> router nexthop-tracking <afi>
Shows the IPv4 or IPv6 next hop tracking information for the specified VRF.
Command Syntax
| Syntax | Description |
|---|---|
<vrf-id> | The VRF name. |
<afi> | The address family (IPv4 or IPv6). |
Version History
Introduced in Cumulus Linux 5.3.0
Example
cumulus@switch:~$ nv show vrf default router nexthop-tracking ipv4
operational applied pending
------------ ------------ ------- -------
[ip-address] 10.10.10.2
[ip-address] 10.10.10.3
[ip-address] 10.10.10.4
[ip-address] 192.168.0.22
nv show vrf <vrf-id> router nexthop-tracking <afi> route-map
Shows the IPv4 or IPv6 next hop tracking information for all route maps in the specified VRF.
You must use --applied with this command to show the output.
Command Syntax
| Syntax | Description |
|---|---|
<vrf-id> | The VRF name. |
<afi> | The address family (IPv4 or IPv6). |
Version History
Introduced in Cumulus Linux 5.3.0
Example
cumulus@switch:~$ nv show vrf default router nexthop-tracking ipv4 route-map --applied
Summary
--------- -------------
routemap1 protocol: bgp
nv show vrf <vrf-id> router nexthop-tracking <afi> route-map <nht-routemap-id>
Shows the IPv4 or IPv6 next hop tracking information for a specific route map in the specified VRF.
You must use --applied with this command to show the output.
Command Syntax
| Syntax | Description |
|---|---|
<vrf-id> | The VRF name. |
<afi> | The address family (IPv4 or IPv6). |
<nht-routemap-id> | The next hop tracking route map name. |
Version History
Introduced in Cumulus Linux 5.3.0
Example
cumulus@switch:~$ nv show vrf default router nexthop-tracking ipv4 route-map ROUTEMAP1 --applied
applied
---------- -------
[protocol] bgp
nv show vrf <vrf-id> router nexthop-tracking <afi> route-map <nht-routemap-id> protocol
Shows the IPv4 or IPv6 next hop tracking information for all protocols in the route map in the specified VRF.
You must use --applied with this command to show the output.
Command Syntax
| Syntax | Description |
|---|---|
<vrf-id> | The VRF name. |
<afi> | The address family (IPv4 or IPv6). |
<nht-routemap-id> | The next hop tracking route map name. |
Version History
Introduced in Cumulus Linux 5.3.0
Example
cumulus@switch:~$ nv show vrf default router nexthop-tracking ipv4 route-map ROUTEMAP1 protocol --applied
---
Bgp
nv show vrf <vrf-id> router nexthop-tracking <afi> route-map <nht-routemap-id> protocol <nht-protocol-id>
Shows the IPv4 or IPv6 next hop tracking information for a specific route map protocol for the specified VRF.
You must use --applied with this command to show the output.
Command Syntax
| Syntax | Description |
|---|---|
<vrf-id> | The VRF name. |
<afi> | The address family (IPv4 or IPv6). |
<nht-routemap-id> | The next hop tracking route map name. |
<nht-protocol-id> | The protocol: bgp, ospf, ospf6, or static. |
Version History
Introduced in Cumulus Linux 5.3.0
Example
cumulus@switch:~$ nv show vrf default router nexthop-tracking ipv4 route-map ROUTEMAP1 protocol bgp --applied