Switches
Fabric → Switches lists switches and congestion across the managed fabric. Open a
switch for its ports and history. Congestion uses collected metrics and is available
to viewers; Ports, Routes, Counters and Terminal need working SSH
credentials and the operator or admin role.
Choose Managed Switches
Managed lists the switches included in congestion rankings and fabric events. Choose
All to see every discovered switch. Operators and admins can change each row's
Managed toggle for all users. An excluded switch stays on the topology map in gray;
its exporter keeps polling. Limit polling separately with SWITCH_MGMT_CIDRS. Hiding changes display scope;
the congestion evaluator continues recording every switch.
Congestion
Configure gNMI on SONiC switches. SNMP-only switches have no queue congestion telemetry. stale, waiting, unsupported and unprobed identify switches whose readings cannot be used. A dash means unavailable; a failed query makes that signal unknown.
Issues lists switch ports with drops, PFC or ECN and RNICs with no congestion control. Most congested servers and Most congested switches rank devices by the number of affected RNICs or ports. Select a server to list its MangoBoost RNICs, or a switch to open Congestion. The rates use the selected 1m, 15m or 1h window.
| Signal | Meaning |
|---|---|
| ECN | Share of transmitted packets marked, and marks per second: an egress queue crossed its marking threshold |
| PFC RX / TX | Pause frames received / sent per second: the peer pauses this port / this port pauses its peer |
| Drops | Egress queue and ingress priority-group drops per second, reported separately |
| Sending CNPs | A MangoBoost RNIC received marked traffic and sent congestion notifications |
| Receiving CNPs | A MangoBoost RNIC was asked to slow its transmission |
A switch port counts as affected with any ECN or PFC, or at least 10 drops/s. Low-rate control traffic can increment ingress drops without indicating congestion. An RNIC counts with at least 1 CNP/s in either direction or ECN on the switch port toward it. RNICs cabled to excluded switches are omitted. Missing or ambiguous LLDP leaves the switch-port association unknown. If placement queries fail, all RNICs are included under a notice because switch-based filtering is unavailable.
The RNIC list shows RDMA rates and Features: CFR, a PCC algorithm and host/SoC mode, Optimized Packet Spraying and Selective Repeat. Unreadable features keep their last reading for up to ten minutes, marked stale, then become unknown. MAC displays these features; configure them with the Mango SDK.
Congestion over time compares the five largest series across the selected 1, 6 or 24 hours. A switch's Congestion tab adds per-port ECN by queue, PFC by priority and direction, drops and peak queue/priority-group buffer use. These counters identify signals and connected devices; they do not establish which flow caused congestion.
See congestion events for persistent episodes.
Ports
Ports shows interface state, IP, MTU, speed and description. On SONiC and Dell OS10 you can change these, reset ports, set breakout and manage loopbacks. Before changing a switch managed by another controller, review the RNIC notices.
Routes
Routes manages BGP neighbors, advertisements, ECMP max-paths and soft reset, and shows the routing table.
Counters
Counters shows traffic rates, discards and errors, plus queue and PFC readings where supported. For streaming telemetry, configure gNMI.
Terminal
Terminal opens an SSH session.
