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Gliffy Diagram
nameRemoteUDSPDstNid1
pagePin1

Table of Contents

Purpose

This document describes the UDSP feature from the user perspective. The document will cover all Intended use cases, list expected behaviour and potential issues for each.

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Gliffy Diagram
nameRemoteUDSPDstNid1
pagePin13

UDSPBehaviour

On PeerB, add UDSP that gives one of the PeerA nids highest priority

On PeerB, designate Gateway1 as preferred for the same PeerA nid.

All sends from PeerB go to the prioritized nid of PeerA through the preferred gateway 

Use "lnetctl stats show" on Gateway1 and Gateway2. On every send from PeerB to PeerA, "route_count" should increase only on Gateway1. On PeerA "send_count" and "recv_count" should increase only for the prioritised nid. On PeerB, Gateway1 should be listed as preferred for the specified nid of PeerA on tcp:

Code Block
lnetctl udsp add --dst 192.168.122.103@tcp

lnetctl udsp add --dst 192.168.122.103@tcp --rte 192.168.122.102@tcp

lnetctl udsp show
udsp:
    - idx: 0
      src: NA
      dst: 192.168.122.103@tcp
      rte: NA
      action:
          priority: 0
    - idx: 1
      src: NA
      dst: 192.168.122.103@tcp
      rte: 192.168.122.102@tcp

PeerB:

Code Block
lnetctl peer show -v 4

>>>>
        - nid: 192.168.122.103@tcp
          udsp info:
              net priority: -1
              nid priority: 0
              Preferred gateway NIDs:
                  NID-0: 192.168.122.102@tcp
<<<<

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