Hi All,
I have been trying to understand Cisco SNMP command
and so far, after a few weeks of reading materials on
Cisco websites and recently purchasing O'reily "Essential
SNMP" prove unsuccessfull in fully
implementing SNMP Version3 (aka SNMPv3).
Mainly, I am having problem understand a few
concept regarding Cisco devices:
1) What is the purpose of Cisco "EngineID id-number",
specifically the "
snmp-server engineID" command?
I understand that the engineID number
is 24 character long and it is useful for SNMPv3
because the user's password digest is based on
both the password and the local engine ID.
Now, does it have any significance for SNMPv1
or SNMPv2c? Can this parameter be omitted if only
SNMPv1 or SNMPv2 is used?
2) What is the difference between local and remote
engineID? I am always
under the impression that if snmp-server is
enable on the router, then the
router will be listening for incoming SNMP traffic on
UDP port 161. Because
port 161 is listening for SNMP traffic,
Network Management Station (NMS)
that runs Management Software like HPOpenView,
Cabletron Spectrum and
Loriot and UCD-SNMP for Unix to querry the router
for information.
Furthermore, if the cisco router is enable for "traps"
it will send 'trap'
messages on UDP port 162 to the NMS for messages
like the link is up/down
or when the router is rebooted. If that is the case,
then what the heck is
the local and remote engineID? It seems like the if the
engineID is "remote" on
the "snmp-server engineID remote id-number", does it
mean that the snmp server
running somewhere other than the router? Can someone
explain this to me?
3) What is the disadvantage of using SNMPv3? Can I still
access MIB-2 and other standard MIBs?
Many thanks
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