Config Router

  • Google Sheets
  • CCNA Online training
    • CCNA
  • CISCO Lab Guides
    • CCNA Security Lab Manual With Solutions
    • CCNP Route Lab Manual with Solutions
    • CCNP Switch Lab Manual with Solutions
  • Juniper
  • Linux
  • DevOps Tutorials
  • Python Array
You are here: Home / Juniper / SNMP statistics for interfaces not clearing after they are cleared

SNMP statistics for interfaces not clearing after they are cleared

May 28, 2016 by James Palmer

Interface statistics are not clearing via SNMP even though they are showing zeros under the show interface extensive.

For all JUNOS platform, the interfaces statistics are not clearing via snmp after they are clear from the cli. Please take a look to the following outputs,
Topology: Mx480(ge-5/2/0.0).1 ————–.2 (ge3/0/1.0)m120 – Addressing: 10.10.10/30
OID: 1.3.6.1.2.1.2.2.1.10 ifInOctets
From MX480:
when we check the show interface statistics, we do see that the interface has some traffic outputs,

lab@lab> show interfaces ge-5/2/0.0 extensive
Logical interface ge-5/2/0.0 (Index 65543) (SNMP ifIndex 611) (Generation 203)
Flags: SNMP-Traps 0x4004000 Encapsulation: ENET2
Traffic statistics:
Input bytes : 420
Output bytes : 490
Input packets: 5
Output packets: 5
Local statistics:
Input bytes : 420
Output bytes : 490
Input packets: 5
Output packets: 5
Transit statistics:
Input bytes : 0 0 bps
Output bytes : 0 0 bps
Input packets: 0 0 pps
Output packets: 0 0 pps

When we perform a query using the SNMP OID, we received a different value,

lab@lab> show snmp mib walk 1.3.6.1.2.1.2.2.1.10 | match 611
ifInOctets.611 = 2316

We can try to clear the stastics from the interface using clear interface command,

lab@lab> clear interfaces statistics ge-5/2/0

lab@lab> show interfaces ge-5/2/0.0 extensive
Logical interface ge-5/2/0.0 (Index 65543) (SNMP ifIndex 611) (Generation 203)
Flags: SNMP-Traps 0x4004000 Encapsulation: ENET2
Traffic statistics:
Input bytes : 0
Output bytes : 0
Input packets: 0
Output packets: 0
Local statistics:
Input bytes : 0
Output bytes : 0
Input packets: 0
Output packets: 0
Transit statistics:
Input bytes : 0 0 bps
Output bytes : 0 0 bps
Input packets: 0 0 pps
Output packets: 0 0 pps

But they are not clear as we can see via SNMP,

lab@Contrabando> show snmp mib walk 1.3.6.1.2.1.2.2.1.10 | match 611
ifInOctets.611 = 2316

We can try to restart the SNMP/Mib-process and we will still have the same behavior,

lab@lab> restart snmp
Simple Network Management Protocol process started, pid 73388

lab@lab> restart mib-process
Management Information Base II process started, pid 73393

lab@lab> show snmp mib walk 1.3.6.1.2.1.2.2.1.10 | match 611
ifInOctets.611 = 2316

This is an expected behavior for all the JUNOS platforms. What happens is that SNMPD will look at the kernel for the statistics and in there they actual values are accumulated so every time that the query is done for any statistics you will have the value accumulated in order to have the actual values or statistics since the interface was brought up. Another thing to keep in consideration is that all the JUNOS counters are real time. These stats are stored in kernel. This number is NOT refreshed or reset after a particular time interval.

As it is represented above even though the process are killed you will see that the counters are incrementing. We have also check that by an interface flapped, it will show the same values.

The only way to have this counter reset, it is to reboot the JUNOS device or offline/online the line card. Please look an example for the line card rebot.

Here, we offline the FPC,

lab@lab> request chassis fpc slot 5 offline
Offline initiated, use "show chassis fpc" to verify

We verify that it is offline,

lab@lab> show chassis fpc
Temp CPU Utilization (%) Memory Utilization (%)
Slot State (C) Total Interrupt DRAM (MB) Heap Buffer
0 Online 30 7 0 2048 12 13
1 Online 29 10 0 2048 12 13
2 Online 34 7 0 2048 18 13
3 Empty
4 Online 38 6 0 1024 7 41
5 Offline ---Offlined by cli command---

Then we online the card,

lab@lab> request chassis fpc slot 5 online
Online initiated, use "show chassis fpc" to verify

lab@lab> show chassis fpc
Temp CPU Utilization (%) Memory Utilization (%)
Slot State (C) Total Interrupt DRAM (MB) Heap Buffer
0 Online 30 8 0 2048 12 13
1 Online 29 8 0 2048 12 13
2 Online 34 5 0 2048 18 13
3 Empty
4 Online 38 5 0 1024 7 41
5 Online 26 0 0 0 0 0 

lab@lab> show chassis fpc
Temp CPU Utilization (%) Memory Utilization (%)
Slot State (C) Total Interrupt DRAM (MB) Heap Buffer
0 Online 30 8 0 2048 12 13
1 Online 29 8 0 2048 12 13
2 Online 34 5 0 2048 18 13
3 Empty
4 Online 38 5 0 1024 7 41
5 Online 26 0 0 0 0 0

When we run the query for the same OID,

lab@lab> show snmp mib walk 1.3.6.1.2.1.2.2.1.10 | match 611
ifInOctets.611 = 0

We receive the actual value that the interface has,

lab@lab> show interfaces ge-5/2/0.0 extensive
Logical interface ge-5/2/0.0 (Index 141075) (SNMP ifIndex 611) (Generation 212)
Flags: SNMP-Traps 0x4004000 Encapsulation: ENET2
Traffic statistics:
Input bytes : 0
Output bytes : 0
Input packets: 0
Output packets: 0
Local statistics:
Input bytes : 0
Output bytes : 0
Input packets: 0
Output packets: 0
Transit statistics:
Input bytes : 0 0 bps
Output bytes : 0 0 bps
Input packets: 0 0 pps
Output packets: 0 0 pps

The second will be just to reboot the entire device and it will behave in the same manner.

Related

Filed Under: Juniper Tagged With: FPC, ifInOctets, SNMP, snmpd

Recent Posts

  • How do I give user access to Jenkins?
  • What is docker volume command?
  • What is the date format in Unix?
  • What is the difference between ARG and ENV Docker?
  • What is rsync command Linux?
  • How to Add Music to Snapchat 2021 Android? | How to Search, Add, Share Songs on Snapchat Story?
  • How to Enable Snapchat Notifications for Android & iPhone? | Steps to Turn on Snapchat Bitmoji Notification
  • Easy Methods to Fix Snapchat Camera Not Working Black Screen Issue | Reasons & Troubleshooting Tips to Solve Snapchat Camera Problems
  • Detailed Procedure for How to Update Snapchat on iOS 14 for Free
  • What is Snapchat Spotlight Feature? How to Make a Spotlight on Snapchat?
  • Snapchat Hack Tutorial 2021: Can I hack a Snapchat Account without them knowing?

Copyright © 2025 · News Pro Theme on Genesis Framework · WordPress · Log in