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Low Bandwidth Intent

The low bandwidth intent finds the path between source and destination with the lowest bandwidth. The bandwidth is based on the theoretical maximum bandwidth given by the interface speed or the virtual rate/bandwidth impairment. The path follows the links with the lowest bandwidth. It's ideal for applications requiring low bandwidth.

Important: the implementation does ensure that the path with the lowest bandwidth is used, thus the path is not optimal in terms of lowest hop count.

Network Topology

The network topology below, with the associated rate limits, is used to demonstrate this intent. The bandwidth/rate impairments were applied using the Lab Impairment Script. Since, the there is almost no traffic in the network, the path should follow the path including the highest bandwidth links.

Hawkv6 Network with Bandwidth Impairments

Example Scenario

In this example, Host-A (acting as a client) requests a low bandwidth path to Host-B (acting as a server). The HawkEye controller calculates the optimal path based on the lowest maximum bandwidth between the two hosts.

HawkWing Configuration

---
client_ipv6_address: 2001:db8:a::10
hawkeye:
  enabled: true
  address: 2001:db8:e5::e
  port: 10000
services:
  webserver-b:
    ipv6_addresses:
      - 2001:db8:b::10
    applications:
      - port: 80
        intents:
          - intent: low-bandwidth

API Request

The low bandwidth request is saved single intent folder. The JSON request format is as follows:

{
    "ipv6_source_address": "2001:db8:a::10",
    "ipv6_destination_address": "2001:db8:c::10",
    "intents": [
        {
            "type": "INTENT_TYPE_LOW_BANDWIDTH"
        }
    ]
}

Result

The result includes the following SID List, ensuring the lowest maximum bandwidth path between the two hosts:

  • fc00:0:1:0:1::
  • fc00:0:3:0:1::
  • fc00:0:7:0:1::
  • fc00:0:6:0:1::
  • fc00:0:b:0:1::

The packets are routed through the following devices: HOST-A -> SITE-A -> XR-1 -> XR-3 -> XR-7 -> XR-6 -> SITE-B -> HOST-B

or in the worst case scenario:

  • fc00:0:1:0:1::
  • fc00:0:3:0:1::
  • fc00:0:2:0:1::
  • fc00:0:6:0:1::
  • fc00:0:7:0:1::
  • fc00:0:8:0:1::
  • fc00:0:b:0:1::

The packets are routed through the following devices: HOST-A -> SITE-A -> XR-1 -> XR-3 -> XR-2 -> XR-6 -> XR-7 -> XR-8 -> SITE-B -> HOST-B

Low Bandwidth Path