Linux Enable LLDP

linux_lldp.md

original source: https://community.mellanox.com/docs/DOC-1522

Option 1: lldpad

1. Install lldpad on the server:

• For RHEL/CentOS

#yum install lldpad

• For Ubuntu

#apt-get install lldpad

2. Run the LLDP Daemon:

#lldpad -d

3. Run the following script:

for i in `ls /sys/class/net/ | grep eth` ;
      do echo "enabling lldp for interface: $i" ;
      lldptool set-lldp -i $i adminStatus=rxtx  ;
      lldptool -T -i $i -V  sysName enableTx=yes;
      lldptool -T -i $i -V  portDesc enableTx=yes ;
      lldptool -T -i $i -V  sysDesc enableTx=yes;
      lldptool -T -i $i -V sysCap enableTx=yes;
      lldptool -T -i $i -V mngAddr enableTx=yes;
done

Note: for RHEL 7 the interface name doesn't contain "eth" but "enp" (or similar) to the grep should be "grep enp".

Note: in case you use lldpad and wish to pass the management address via LLDP TLV on specific interface, you need to add this specifically. Otherwise, only the hostname will pass via LLDP TLV.

For example:

# lldptool -T -i eth2 -V mngAddr ipv4=192.168.24.185

Option 2: lldpd

Another possible LLDP linux application is called lldpd (not lldpad) This version of LLDP doesn't require and specific configuration, it sends the TLVs by default. including the management address.

• For RHEL/CentoOS There is no yum inventory For RHEL/CentOS for this application, need to download the install the rpm (there are several location on the web for that) and then to restart the application. Here is a link to download the llapd.

#/etc/init.d/lldpd restart

• For Ubuntu

#apt-get install lldpad
#/etc/init.d/lldpd restart

Once lldpad or lldpd are installed, make sure SNMP is running:

# /etc/init.d/snmpd start
Starting snmpd (via systemctl):                            [  OK  ]

why do we need snmpd to be running ?

When you say

For RHEL/CentoOS There is no yum inventory For RHEL/CentOS for this application

you mean to say

For RHEL/CentOS, you will need to add the EPEL repository (e.g. via yum install epel-release) before installing lldpd (e.g. yum install lldpd)

You may also want to stress that /etc/init.d was never proper on any enterprise linux. While it's not proper either, service lldpd start is still compatible across all enterprise linux variants.