Configuring the Simple Network Management Protocol (SNMP)

Marking an interface down

Suppose that the net1 interface of a host configured as a router is reporting many errors. SNMP can be used to mark the link as being ``down'' remotely.

First, the error count can be obtained with snmpstat.

   # snmpstat -i paris public
   Interface statistics
                        Type      InOctet   InPckts   InErrs   IfMtu
   Name    Address      Speed     OutOctet  OutPckts  OutErrs  OutQlen
   net0    paris        enetv2    3682304   14384     4800     1500
           02000000ec2f 10000000  2122240   8290      2138     0
   net1    paris        enetv2    3895218   18239     17036    1500
           02000000ec6c 10000000  2392148   8183      8147     0
   lo0     localhost    loop      5832      64        0        2048
                        0         5832      64        0        0

Next, the interface can be marked as being ``down'' using setany.

   # setany paris public ifAdminStatus.2 -i 2
   Name: ifAdminStatus.2
   Value: 2

When the line is repaired, the interface can be reactivated in a similar fashion:

   # setany paris public ifAdminStatus.2 -i 1
   Name: ifAdminStatus.2
   Value: 1