Centos configures lldp to establish a neighbor relationship with the switch

The program to open lldp on centos is lldpad, and lldpd on ubuntu. Of course, the connected switch also needs to open lldp

First install and run

#yum install lldpad
#lldpad -d

Open on all interfaces

for i in `ls /sys/class/net/ | grep "em\|eth"|grep -v veth`
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 ipv4=`hostname -I`
  lldptool -T -i $i -V mngAddr enableTx=yes
done

In this way, the switch can find that
lldpad has a command line debugging tool on the server

#lldptool get-tlv -n -i "interface"

Ubuntu should be easier to use, directly have lldpcli command line for debugging

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lldp protocol packet capture:

tcpdump -i enp3s0 -nev ether proto 0x88cc

centos7 recommends the following scheme for simpler configuration: https://blog.csdn.net/BK_sys/article/details/88554593

lldpd yum installation method: https://software.opensuse.org/download.html?project=home:vbernat&package=lldpd