JuniperHighBandwidthUsage1gib

JuniperHighBandwidthUsage1gib #

Interface is highly saturated. (> 0.90GiB/s)

Alert Rule
alert: JuniperHighBandwidthUsage1gib
annotations:
  description: |-
    Interface is highly saturated. (> 0.90GiB/s)
      VALUE = {{ $value }}
      LABELS = {{ $labels }}    
  runbook: https://srerun.github.io/prometheus-alerts/runbooks/czerwonk-junos-exporter/juniperhighbandwidthusage1gib/
  summary: Juniper high Bandwidth Usage 1GiB (instance {{ $labels.instance }})
expr: rate(junos_interface_transmit_bytes[1m]) * 8 > 1e+9 * 0.90
for: 1m
labels:
  severity: critical

alert: JuniperHighBandwidthUsage1gib
annotations:
  description: |-
    Interface is getting saturated. (> 0.80GiB/s)
      VALUE = {{ $value }}
      LABELS = {{ $labels }}    
  runbook: https://srerun.github.io/prometheus-alerts/runbooks/czerwonk-junos-exporter/juniperhighbandwidthusage1gib/
  summary: Juniper high Bandwidth Usage 1GiB (instance {{ $labels.instance }})
expr: rate(junos_interface_transmit_bytes[1m]) * 8 > 1e+9 * 0.80
for: 1m
labels:
  severity: warning

Here is a sample runbook for the Prometheus alert rule:

Meaning #

The JuniperHighBandwidthUsage1gib alert is triggered when the transmit bandwidth of a Juniper interface exceeds 90% of its 1GiB capacity. This alert indicates that the interface is highly saturated, which can lead to network congestion, packet loss, and poor performance.

Impact #

  • Network congestion and packet loss
  • Poor network performance and reliability
  • Potential impact on critical business applications and services
  • Increased risk of network downtime and outages

Diagnosis #

To diagnose the issue, follow these steps:

  1. Check the interface usage: Verify the transmit bandwidth usage of the affected interface using the junos_interface_transmit_bytes metric.
  2. Identify the traffic source: Analyze the network traffic to determine the source of the high bandwidth usage (e.g., specific applications, hosts, or networks).
  3. Check for configuration issues: Review the Juniper device configuration to ensure that there are no misconfigured settings or policies that could be contributing to the high bandwidth usage.
  4. Verify device resource utilization: Check the CPU and memory utilization of the Juniper device to ensure that it is not overwhelmed.

Mitigation #

To mitigate the issue, follow these steps:

  1. Implement traffic shaping or policing: Configure traffic shaping or policing policies on the Juniper device to limit the bandwidth usage of specific applications or hosts.
  2. Optimize network configuration: Review and optimize the network configuration to ensure that it is aligned with best practices and is not contributing to the high bandwidth usage.
  3. Upgrade device resources: Consider upgrading the Juniper device resources (e.g., CPU, memory) to ensure that it can handle the increased bandwidth demands.
  4. Monitor and analyze network traffic: Continuously monitor and analyze network traffic to identify and address any potential issues before they become critical.
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