CISCOSB-rlBrgMulticast-MIB

MIB Reference — IPNetwork Monitor · Updated September 09, 2026

All MIBsCISCOSB-rlBrgMulticast-MIB

Organization: Cisco Small Business

Last Updated: 2011-05-30

Category: Technology: Bridging, Vendor: Cisco

Description: Manages Layer 2 multicast bridging and multicast filtering on Cisco Small Business switches.

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What Is CISCOSB-rlBrgMulticast-MIB?

CISCOSB-rlBrgMulticast-MIB is a private Cisco Small Business MIB covering Layer 2 multicast bridging behavior, specifically IGMP snooping and MLD snooping for constraining multicast traffic to interested ports, plus MAC-level multicast filtering. It exposes configuration data such as global snooping enable flags, per-VLAN IGMP version, host/router aging timers, and multicast TV-VLAN mappings used in IPTV deployments. Its monitoring value is primarily software/configuration status: verifying rlIgmpSnoopEnable and per-VLAN rlIgmpSnoopVlanIgmpVersion are correctly set, and that rlIgmpSnoopHostAgingTime/rlIgmpSnoopRouterAgingTime are tuned appropriately, since misconfigured aging can cause multicast streams to be flooded or dropped prematurely. It relies on standard IGMP/MLD protocol concepts (RFC 3376 IGMPv3, MLD) that it applies at the switch-snooping layer rather than defining new multicast routing behavior. It is typically deployed on Cisco Small Business switches carrying IPTV or multicast video/audio streams to reduce unnecessary flooding. Engineers can download the CISCOSB-rlBrgMulticast-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCOSB-rlBrgMulticast-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

  • Cisco Small Business (SB/SG series) switch

Monitoring Examples

An administrator would check rlIgmpSnoopEnable and rlIgmpSnoopVlanTable/Entry's rlIgmpSnoopVlanIgmpVersion to confirm snooping is active and using the expected IGMP version on a given VLAN. Inspecting rlIgmpSnoopMulticastTvTable for the rlIgmpSnoopMulticastTvVID mapping helps verify an IPTV multicast VLAN is correctly bound. If rlIgmpSnoopHostAgingTime is set too short, hosts actively watching a multicast stream may be aged out and the stream unnecessarily flooded or stopped, which would show up as unstable rlIgmpSnoopIGMP224ReportsHandle counts.

What Can Be Monitored

  • IGMP/MLD snooping enable state
  • per-VLAN IGMP version
  • host and router aging timers
  • multicast TV-VLAN mapping
  • MAC multicast filter state
  • IGMP report handling
Imported Objects

From BRIDGE-MIB

MacAddress

From CISCOSB-DEVICEPARAMS-MIB

rndErrorDescOBJECT-TYPE
rndErrorSeverityOBJECT-TYPE

From CISCOSB-MIB

rlBrgMulticastOBJECT-IDENTITY
rndNotificationsOBJECT-IDENTITY
switch001MODULE-IDENTITY

From IF-MIB

InterfaceIndex

From INET-ADDRESS-MIB

InetAddress
InetAddressType

From Q-BRIDGE-MIB

PortList
VlanIndex

From SNMPv2-SMI

IpAddress
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
TimeTicks
Unsigned32

From SNMPv2-TC

RowStatus
TEXTUAL-CONVENTION
TruthValue
OIDs

RFC description

Manages IGMP snooping and MAC multicast bridging on Cisco Small Business switches for efficient multicast traffic forwarding.

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Download CISCOSB-rlBrgMulticast-MIB