The field points to the snmp_mibII(3) interface structure.
mib
The special ATM interface MIB (see below).
carrier
The current state of the carrier. One of the following:
ATMIF_CARRIER_ON
carrier detected,
ATMIF_CARRIER_OFF
no carrier,
ATMIF_CARRIER_UNKNOWN
the state of the carrier is unknown,
ATMIF_CARRIER_NONE
the device has no notion of carrier or is not able to sense it.
mode
For ATM devices with a SUNI chip this is the current mode of the interface:
ATMIF_SUNI_MODE_SONET
The interface is in SONET mode.
ATMIF_SUNI_MODE_SDH
The interface is in SDH mode.
ATMIF_SUNI_MODE_UNKNOWN
The interface either has no SUNI interface or the mode is unknown (for example, interface is down).
An ATM interface can be found by name or by SNMP interface index (see snmp_mibII(3) for a discussion of interface indexes). The function atm_find_if_name searches an interface given a name. The function atm_find_if searches an interface by its interface index. Both functions return NULL if an interface cannot be found.
The ATM MIB contains the following fields:
struct atmif_mib {
u_int version; /* currently 0 */
u_int device; /* type of hardware (system specific) */
u_int serial; /* card serial number (device specific) */
u_int hw_version;/* card version (device specific) */
u_int sw_version;/* firmware version (device specific) */
u_int media;/* physical media (see MIB) */
u_char esi[6]; /* end system identifier (MAC) */
u_int pcr; /* supported peak cell rate */
u_int vpi_bits; /* number of used bits in VPI field */
u_int vci_bits; /* number of used bits in VCI field */
u_int max_vpcs; /* maximum number of VPCs */
u_int max_vccs; /* maximum number of VCCs */
};
The interface is destroyed. The notification argument is not used.
ATMIF_NOTIFY_CARRIER
The carrier state on the interface has changed. The argument is the old state of the carrier. The new state can be obtained from the interface structure.
ATMIF_NOTIFY_VCC
A permanent VCC has been created or destroyed. The argument is an u_int that can be decoded as follows:
vpi = (arg >> 24) & 0xff;
vci = (arg >> 8) & 0xffff;
state = arg & 1;
state is 0 if the VCC was destroyed and 1 if it was created.
The registration for notification can be undone by passing the return value from atm_notify_aif to atm_unnotify_aif. The registrations is automatically removed if the interface is destroyed.
This table is an extension of ifTable. It contains a row for each ATM interface and is index with ifIndex. All fields are read-only except the begemotAtmIfMode column.
begemotAtmIfTableLastChange
Contains the tick when a row was created or destroyed in the above table or 0, if the table did not change since start of the SNMP agent.
begemotAtmHWTable
Is also indexed by ifIndex and contains hardware specific information. This table is read-only.
