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Link and SNMP Status
Physical Link Status SNMP Operational Status
zre1 zre2 zre1 zre2
zhp0
down down down down down
down up down up up
up down up down up
up up up up up
Table 5.3: Link and SNMP Status
The administrative status is directly controlled by ifconfig up/down. The administrative status
of the zhps and zres do not affect each other.
ifStackTable Entries
In the actual ifStackTable as shown in the MIB walk the following two OIDs (which denote
ifIndexes) show the relationships.
ifMIB.ifMIBObjects.ifStackTable.ifStackEntry.ifStackStatus.0.1 =
active(1)
ifMIB.ifMIBObjects.ifStackTable.ifStackEntry.ifStackStatus.0.2 =
active(1)
If they are X.Y then
• if X = 0 there is nothing above this interface
• if Y = 0 there is nothing below this interface
otherwise interface X has interface Y as a logical constituent.
SNMP Configuration
The SNMP agent is called snmpd and is started by default from the Linux boot up script
/etc/rcZ.d/S75snmpd
. If you do not wish to start snmpd, remove
etc/rcZ.d/S75snmpd
.
Configuration of the OpenArchitect switch SNMP agent is the same as configuration of any
standard Linux host that uses the NET-SNMP agent. Configuration information for persistent
data and security information is kept in
snmpd.conf
under the default SNMP configuration
location, which for the OpenArchitect switch is
/usr/share/snmp
.
snmpd.conf
is the
location to change sys information such as the syslocation and syscontact, as well as
permissions such as the rocommunity or rwcommunity.
NOTE: For NET-SNMP agents, these objects (sysLocation.0, sysContact.0 and
sysName.0) ordinarily are read-write. However, specifying the value for one of these
objects by giving the appropriate token in snmpd.conf makes the corresponding object
read-only, and attempts to set the value of the object will result in a notWritable error
Ethernet Switch Blade User's Guide release 3.2.2j page 81