FOUNDRY-SN-SW-L4-SWITCH-GROUP-MIB

MIB Reference — IPNetwork Monitor · Updated October 05, 2026

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Organization: Brocade Communications Systems, Inc.

Last Updated: 2010-06-02

Category: Vendor: Foundry/Brocade

Description: Brocade Foundry Layer 4 switch group MIB providing server load balancing, traffic distribution, and application switching management objects.

Start monitoring vendor-neutral, standards-based MIB, any SNMPv3-capable network device (SNMP engine identity/boot/clock status) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

What Is FOUNDRY-SN-SW-L4-SWITCH-GROUP-MIB?

FOUNDRY-SN-SW-L4-SWITCH-GROUP-MIB is a Brocade (formerly Foundry Networks) enterprise MIB that manages the Layer 4 server-load-balancing (SLB) and application-switching functions on Foundry/Brocade switching platforms. It exposes global SLB configuration limits such as snL4MaxSessionLimit and snL4TcpSynLimit, along with live session/traffic counters in objects like snL4slbTotalConnections, snL4slbForwardTraffic, snL4slbReverseTraffic, snL4slbDrops, snL4slbAged, and snL4slbFinished, plus virtual-server/real-server grouping objects (snL4VirtualServer, snL4RealServer). Its principal use is software/service-level load monitoring: tracking total and dropped connections, aged (timed-out) sessions, and forward/reverse traffic volume reveals whether the load balancer is healthy and whether backend real servers are handling traffic properly, while snL4slbLimitExceeds and snL4slbDisableCount flag capacity or health-check failures affecting specific virtual/real servers. It complements standard IF-MIB interface counters by adding L4/application-layer session semantics specific to Foundry's SLB feature set. It is deployed on Brocade/Foundry ServerIron-class switches used for server load balancing in data centers, and a FOUNDRY-SN-SW-L4-SWITCH-GROUP-MIB download from Brocade is normally required to compile these SLB session and traffic objects into a monitoring platform.

IPNetwork Monitor allows you to monitor SNMP objects defined in FOUNDRY-SN-SW-L4-SWITCH-GROUP-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

  • Brocade/Foundry ServerIron-class Layer 4-7 switch

Monitoring Examples

An administrator would poll snL4slbTotalConnections, snL4slbForwardTraffic, and snL4slbReverseTraffic to gauge overall load-balancer traffic, while watching snL4slbDrops, snL4slbDangling, and snL4slbDisableCount per snL4RealServer entry. A rising snL4slbDrops count together with an increasing snL4slbDisableCount would indicate that one or more real servers behind a snL4VirtualServer are failing health checks or exceeding snL4MaxSessionLimit, degrading the load-balanced application's availability.

What Can Be Monitored

  • total SLB connections
  • forward/reverse traffic volume
  • dropped/aged/finished sessions
  • real server disable/health-check failures
  • session limit exceed events
  • virtual/real server configuration
Imported Objects

From FOUNDRY-SN-AGENT-MIB

DisplayString

From FOUNDRY-SN-ROOT-MIB

switchOBJECT-IDENTITY

From SNMPv2-SMI

Counter32
Counter64
Integer32
IpAddress
MODULE-IDENTITY
OBJECT-TYPE
TimeTicks

From SNMPv2-TC

TEXTUAL-CONVENTION

How to Use in IPNetwork Monitor

Example using snL4slbTotalConnections OID:

Select a Brocade/Foundry ServerIron-class Layer 4-7 switch (server load balancing) as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type snL4slbTotalConnections into the Find box to locate it in the OID tree, then select it and click OK. It reports the total connections in this device. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter32-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.
OIDs

RFC description

Layer 4 load balancing and switching configuration for Brocade/Foundry network switches.

Start monitoring Brocade/Foundry ServerIron-class Layer 4-7 switch (server load balancing) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

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