Tip
This is the documentation for the 19.02 version. Looking for the documentation of the latest version? Have a look here.
Monitoring Interfaces¶
Each interface has associated counters, which enable traffic volume and error monitoring.
Note
To limit the amount of administrative traffic, VPP only updates these counters every 10 seconds.
There are four commands used to monitor interfaces, show interface, show
counters, interface clear counters, and show packet-counters.
show interface¶
The show interface command prints important traffic volume and error counters
specific to each interface. For example:
tnsr# show interface
Interface: GigabitEthernet0/6/0
Admin status: up
Link up, 1G bit/sec, full duplex
Link MTU: 9216 bytes
MAC address: 00:00:42:0b:86:cf
IPv4 Route Table: ipv4-VRF:0
IPv4 addresses:
1.1.1.1/24
IPv6 Route Table: ipv6-VRF:0
counters:
received: 214541 bytes, 2144 packets, 0 errors
transmitted: 862 bytes, 11 packets, 0 errors
2143 drops, 0 punts, 0 rx miss, 0 rx no buffer
The show interface command also supports filtering of its output using one
or more special keywords. When the list is filtered, its name, description, and
administrative status are printed along with the chosen output.
- acl
Prints the access control lists configured on an interface
- counters
Prints the interface traffic counters for an interface
- ipv4
Prints the IPv4 addresses present on the interface and the IPv4 route table used by the interface.
- ipv6
Prints the IPv6 addresses present on the interface and the IPv6 route table used by the interface.
- link
Prints the link status (e.g. up or down), media type and duplex, and MTU
- mac
Prints the hardware MAC address, if present
- nat
Prints the NAT role for an interface (e.g. inside or outside)
These keywords may be used with the entire list of interfaces, for example:
tnsr# show interface ipv4
The filtering may also be applied to a single interface:
tnsr# show interface GigabitEthernet0/6/0 link
Multiple keywords may also be used:
tnsr# show interface ipv4 link
show counters¶
The show counters command displays detailed information on all available
interface counters.
Example output:
tnsr# show counters
Interface: GigabitEthernet0/6/0
admin up link up
counter: value updated cleared elapsed
rx-bytes: 8118 1520970418 1520970410 8
rx-packets: 82 1520970418 1520970410 8
rx-ip4: 82 1520970418 1520970410 8
rx-ip6: 0 1520970418 1520970410 8
rx-error: 0 1520970418 1520970410 8
rx-miss: 0 1520970418 1520970410 8
rx-no-buffer: 0 1520970418 1520970410 8
tx-bytes: 0 1520970418 1520970410 8
tx-packets: 0 1520970418 1520970410 8
tx-error: 0 1520970418 1520970410 8
drop: 82 1520970418 1520970410 8
punt: 0 1520970418 1520970410 8
The columns have the following meanings:
- counter
The name of the counter.
- value
The value, as of the last update, for the named counter.
- updated
The time that the counters were last updated. This time is represented as a UNIX timestamp, which is the number of seconds since midnight, January 1st 1970 UTC based on the time setting of the router.
- cleared
A UNIX timestamp representing the last time that the counter values were reset.
- elapsed
The elapsed time, in seconds, since the counters were cleared. This is calculated as (update time - cleared time).
Counter values take a minimum of 10 seconds to be populated with valid data.
During this time, the values in this table are invalid and the value and
updated time will be 0.
The cleared time will not update until the counters are manually cleared.
Until this happens, the cleared and elapsed time are displayed as -.
clear interface counters¶
The interface clear counters <name> command clears all counters
on a given interface.
If no specific interface is given,
all interfaces will have their counters cleared:
tnsr# interface clear counters
Counters cleared
tnsr#
Available Counters¶
Counter |
Description |
|---|---|
rx-bytes |
bytes received |
rx-packets |
packets received |
rx-ip4 |
IPv4 packets received |
rx-ip6 |
IPv6 packets received |
rx-error |
receiver errors |
rx-miss |
receiver miss |
rx-no-buffer |
no buffers on receiver |
tx-bytes |
bytes transmitted |
tx-packets |
packets transmitted |
tx-error |
transmitter errors |
drop |
packets dropped |
punt |
packets punted |
show packet-counters¶
The show packet-counters command prints packet statistics and error counters
taken from the dataplane. These counters show counts of packets that have passed
through various aspects of processing, such as encryption, along with various
types of packet send/receive errors.
Example output:
tnsr# show packet-counters
Count Node Reason
624 dpdk-crypto-input Crypto ops dequeued
624 dpdk-esp-decrypt-post ESP post pkts
624 dpdk-esp-decrypt ESP pkts received
622 esp-encrypt ESP pkts received
624 ipsec-if-input good packets received
304 ip4-input Multicast RPF check failed
9 ip4-arp ARP requests sent
22 lldp-input lldp packets received on disabled interfaces
8 ethernet-input no error
2 ethernet-input unknown ethernet type
5821 ethernet-input unknown vlan
16 arp-input ARP request IP4 source address learned
28 GigabitEthernet0/14/0-output interface is down
8 GigabitEthernet3/0/0-output interface is down