1、安装snmp及本地mib库
apt-get install snmp snmp-mibs-downloader
2、获取接口带宽：
snmpwalk -v 2c -c community 1.1.1.1 ifInOctets.55 |awk '{print $NF}'
-v 1|2c|3 指定SNMP协议版本
-c COMMUNITY 指定共同体字符串
3、带宽计算：
providing an example is a good idea.
time= 60 seconds
Diff. Inoctets = 1427697887 - 1427402450 = 295437 octets received in 60 seconds
1 octet = 8 bits
average bit rate = Diff.InOcoctets*8/60 =
39391,6 bps
so the usage is :
39391,6 / 1544000 = 2,55 % usage of BW inbound direction
you can perform a similar calculation for outbound direction
4、报错：ifOutOctets.55: Unknown Object Identifier (Sub-id not found: (top) -> ifOutOctets)
修改本地配置，vim /etc/snmp/snmp.conf
注释#mibs
来源：https://blog.csdn.net/wang1144/article/details/52399589