---
name: "SNMP::Info::Layer2"
section: "3pm"
platform: "linux"
package: "libsnmp-info-perl"
version: "3.972002-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/SNMP::Info::Layer2"
---

# SNMP::Info::Layer2(3pm)

SNMP Interface to network devices serving Layer2 only.

## NAME

SNMP::Info::Layer2 - SNMP Interface to network devices serving Layer2 only.

## AUTHOR

Max Baker

## SYNOPSIS

```
 # Let SNMP::Info determine the correct subclass for you.
 my $l2 = new SNMP::Info(
                          AutoSpecify => 1,
                          Debug       => 1,
                          DestHost    => 'myswitch',
                          Community   => 'public',
                          Version     => 2
                        )
    or die "Can't connect to DestHost.\n";
 my $class      = $l2->class();
 print "SNMP::Info determined this device to fall under subclass : $class\n";
 # Let's get some basic Port information
 my $interfaces = $l2->interfaces();
 my $i_up       = $l2->i_up();
 my $i_speed    = $l2->i_speed();
 foreach my $iid (keys %$interfaces) {
    my $port  = $interfaces->{$iid};
    my $up    = $i_up->{$iid};
    my $speed = $i_speed->{$iid}
    print "Port $port is $up. Port runs at $speed.\n";
 }
```

## DESCRIPTION

This class is usually used as a superclass for more specific device classes listed under SNMP::Info::Layer2::\*   Please read all docs under SNMP::Info first.

Provides abstraction to the configuration information obtainable from a Layer2 device through SNMP.  Information is stored in a number of MIBs.

For speed or debugging purposes you can call the subclass directly, but not after determining a more specific class using the method above.

```
 my $l2 = new SNMP::Info::Layer2(...);
```

### Inherited Classes

- SNMP::Info

  - SNMP::Info::Bridge

  - SNMP::Info::DocsisHE

  - SNMP::Info::Entity

  - SNMP::Info::LLDP

  - SNMP::Info::PowerEthernet

  - SNMP::Info::PortAccessEntity

  ### Required MIBs

- Inherited Classes

  MIBs required by the inherited classes listed above.

MIBs can be found in netdisco-mibs package.

## GLOBALS

These are methods that return scalar value from SNMP

### Overrides

- $l2-\>**model()**

  Cross references `$l2`-\>**id()** with product IDs in the Cisco MIBs.

  For HP devices, removes `'hpswitch'` from the name

  For Cisco devices, removes c\<'sysid'\> from the name

- $l2-\>**vendor()**

  Tries to discover the vendor from `$l2`-\>**model()** and `$l2`-\>**description()**

- $l2-\>**serial()**

  Returns a serial number if found from *ENTITY-MIB* and *OLD-CISCO-*... MIB.

### Globals imported from SNMP::Info

See documentation in "USAGE" in SNMP::Info for details.

### Globals imported from SNMP::Info::Bridge

See documentation in "GLOBALS" in SNMP::Info::Bridge for details.

### Globals imported from SNMP::Info::Entity

See documentation in "GLOBALS" in SNMP::Info::Entity for details.

### Globals imported from SNMP::Info::LLDP

See documentation in "GLOBALS" in SNMP::Info::LLDP for details.

### Globals imported from SNMP::Info::PortAccessEntity

See documentation in "GLOBALS" in SNMP::Info::PortAccessEntity for details.

## TABLE METHODS

These are methods that return tables of information in the form of a reference to a hash.

### Overrides

- $l2-\>**interfaces()**

  Creates a map between the interface identifier (iid) and the physical port name.

  Defaults to `"ifDescr"` but checks and overrides with `"ifName"`

### Table Methods imported from SNMP::Info

See documentation in "USAGE" in SNMP::Info for details.

### Table Methods imported from SNMP::Info::Bridge

See documentation in "TABLE METHODS" in SNMP::Info::Bridge for details.

### Table Methods imported from SNMP::Info::Entity

See documentation in "TABLE METHODS" in SNMP::Info::Entity for details.

### Table Methods imported from SNMP::Info::LLDP

See documentation in "TABLE METHODS" in SNMP::Info::LLDP for details.

### Table Methods imported from SNMP::Info::PortAccessEntity

See documentation in "TABLE METHODS" in SNMP::Info::PortAccessEntity for details.