Monitoring Interfaces and Transceivers with NVUE
NVUE enables you to check the status of an interface, and view and clear interface counters. Interface counters provide information about an interface, such as the number of packets dropped, the number of inbound and outbound packets not transmitted because of errors, and so on.
Monitor Interface Status
To check the configuration and statistics for an interface, run the nv show interface <interface> command:
cumulus@switch:~$ nv show interface swp1
operational applied pending
------------------------ ----------------- ------- -------
type swp swp
[acl]
evpn
multihoming
uplink off
ptp
enable off
router
adaptive-routing
enable off
ospf
enable on
area none
cost auto
mtu-ignore off
network-type broadcast
passive on
priority 1
authentication
enable off
bfd
enable off
timers
dead-interval 40
hello-interval 10
retransmit-interval 5
transmit-delay 1
ospf6
enable off
pbr
[map]
pim
enable off
synce
enable off
ip
igmp
enable off
ipv4
forward on
ipv6
enable on
forward on
neighbor-discovery
enable on
[dnssl]
home-agent
enable off
[prefix]
[rdnss]
router-advertisement
enable on
fast-retransmit on
hop-limit 64
interval 600000
interval-option off
lifetime 1800
managed-config off
other-config off
reachable-time 0
retransmit-time 0
router-preference medium
vrrp
enable off
vrf default
[gateway]
link
auto-negotiate off on
duplex full full
speed 1G auto
fec auto
mtu 9216 9216
[breakout]
state up up
stats
carrier-transitions 4
in-bytes 300 Bytes
in-drops 5
in-errors 0
in-pkts 5
out-bytes 9.73 MB ß
out-drops 0
out-errors 0
out-pkts 140188
mac 48:b0:2d:ef:52:b8
ifindex 3
Show Interface Counters
NVUE provides the following commands to show counters (statistics) for the interfaces on the switch.
NVUE Command |
Description |
|---|---|
nv show interface --view counters |
Shows all statistics for all the interfaces configured on the switch, such as the total number of received and transmitted packets, and the number of received and transmitted dropped packets and error packets. |
nv show interface <interface> counters |
Shows all statistics for a specific interface, such as the number of received and transmitted unicast, multicast and broadcast packets, the number of received and transmitted dropped packets and error packets, and the number of received and transmitted packets of a certain size. |
nv show interface <interface> counters errors |
Shows the number of error packets for a specific interface, such as the number of received and transmitted packet alignment, oversize, undersize, and jabber errors. |
nv show interface <interface> counters drops |
Shows the number of received and transmitted packet drops for a specific interface, such as ACL drops, buffer drops, queue drops, and non-queue drops. |
nv show interface <interface> counters pktdist |
Shows the number of received and transmitted packets of a certain size for a specific interface. |
nv show interface <interface> counters qos |
Shows QoS statistics for the specified interface. See Show Qos Counters. |
nv show interface <interface> counters ptp |
Shows PTP statistics for a specific interface. See Show PTP Counters. |
The following example shows all statistics for all the interfaces configured on the switch:
cumulus@switch$ nv show interface --view counters
Interface MTU RX_OK RX_ERR RX_DRP RX_OVR TX_OK TX_ERR TX_DRP TX_OVR Flg
-------------- ----- ----- ------ ------ ------ ----- ------ ------ ------ -----
BLUE 65575 1 0 0 0 0 0 4 0 OmRU
RED 65575 1 0 0 0 0 0 4 0 OmRU
bond1 9000 718 0 0 0 1091 0 0 0 BMmRU
bond2 9000 727 0 0 0 1088 0 0 0 BMmRU
bond3 9000 722 0 0 0 1089 0 0 0 BMmRU
br_default 9216 360 0 10 0 475 0 0 0 BMRU
eth0 1500 946 0 0 0 299 0 0 0 BMRU
lo 65536 651 0 0 0 651 0 0 0 LRU
mgmt 65575 283 0 0 0 0 0 4 0 OmRU
peerlink 9216 4972 0 0 0 5028 0 0 0 BMmRU
peerlink.4094 9216 3263 0 0 0 3224 0 0 0 BMRU
swp1 9000 721 0 0 0 1091 0 0 0 BMsRU
swp2 9000 730 0 0 0 1088 0 0 0 BMsRU
swp3 9000 725 0 0 0 1089 0 0 0 BMsRU
swp49 9216 2807 0 0 0 2691 0 0 0 BMsRU
swp50 9216 2165 0 0 0 2337 0 0 0 BMsRU
swp51 9216 685 0 0 0 690 0 0 0 BMRU
swp52 9216 703 0 0 0 722 0 0 0 BMRU
swp53 9216 738 0 0 0 710 0 0 0 BMRU
swp54 9216 682 0 0 0 730 0 0 0 BMRU
vlan10 9216 108 0 20 0 91 0 0 0 BMRU
vlan10-v0 9216 63 0 20 0 45 0 0 0 BMRU
vlan20 9216 104 0 20 0 88 0 0 0 BMRU
vlan20-v0 9216 58 0 20 0 44 0 0 0 BMRU
vlan30 9216 112 0 20 0 94 0 0 0 BMRU
vlan30-v0 9216 61 0 20 0 44 0 0 0 BMRU
vlan4024_l3 9216 1 0 0 0 82 0 0 0 BMRU
vlan4024_l3-v0 9216 0 0 0 0 36 0 0 0 BMRU
vlan4036_l3 9216 1 0 0 0 85 0 0 0 BMRU
vlan4036_l3-v0 9216 0 0 0 0 37 0 0 0 BMRU
vxlan48 9216 45 0 0 0 21 0 0 0 BMRU
The following example shows all statistics for swp1:
cumulus@switch$ nv show interface swp1 counters
operational applied
------------------- ----------- -------
carrier-transitions 4
Detailed Counters
====================
Counter Receive Transmit
----------------- ------- --------
Broadcast Packets 0 0
Multicast Packets 0 0
Total Octets 0 0
Total Packets 0 0
Unicast Packets 0 0
Drop Counters
================
Counter Receive Transmit
--------------- ------- --------
ACL Drops 0 n/a
Buffer Drops 0 n/a
Non-Queue Drops n/a 0
Queue Drops n/a 0
Total Drops 0 0
Error Counters
=================
Counter Receive Transmit
---------------- ------- --------
Alignment Errors 0 n/a
FCS Errors 0 n/a
Jabber Errors 0 n/a
Length Errors 0 n/a
Oversize Errors 0 n/a
Symbol Errors 0 n/a
Total Errors 0 0
Undersize Errors 0 n/a
Packet Size Statistics
=========================
Counter Receive Transmit
---------- ------- --------
64 0 0
65-127 0 0
128-255 0 0
256-511 0 0
512-1023 0 0
1024-1518 0 0
1519-2047 0 0
2048-4095 0 0
4096-16383 0 0
Ingress Buffer Statistics
============================
priority-group rx-frames rx-buffer-discards rx-shared-buffer-discards
-------------- --------- ------------------ -------------------------
0 0 0 Bytes 0 Bytes
1 0 0 Bytes 0 Bytes
2 0 0 Bytes 0 Bytes
3 0 0 Bytes 0 Bytes
4 0 0 Bytes 0 Bytes
5 0 0 Bytes 0 Bytes
6 0 0 Bytes 0 Bytes
7 0 0 Bytes 0 Bytes
...
The following example shows error counters for swp1:
cumulus@switch$ nv show interface swp1 counters errors
Counter Receive Transmit
---------------- ------- --------
Alignment Errors 0 n/a
FCS Errors 0 n/a
Jabber Errors 0 n/a
Length Errors 0 n/a
Oversize Errors 0 n/a
Symbol Errors 0 n/a
Total Errors 0 0
Undersize Errors 0 n/a
- NVUE does not show detailed statistics for logical interfaces, such as bonds, VLAN interfaces or subinterfaces. To see basic statistics for logical interfaces, run the
nv show interface <interface> link statscommand. - On Mellanox switches, Cumulus Linux updates physical counters to the kernel every two seconds and virtual interfaces (such as VLAN interfaces) every ten seconds. You cannot change these values. Because the update process takes a lower priority than other
switchdprocesses, the interval might be longer when the system is under a heavy load.
Clear Interface Counters
To clear counters (statistics) for all interfaces, run the nv action clear interface counters command:
cumulus@switch$ nv action clear interface counters
all interface counters cleared
Action succeeded
To clear the counters for an interface, run the nv action clear interface <interface> counters command:
cumulus@switch$ nv action clear interface swp1 counters
swp1 counters cleared
Action succeeded
The nv action clear interface <interface> counters command does not clear counters in the hardware.