DES-3550 Layer 2
Fast Ethernet Switch User’s Guide
164
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Member Switch (MS)
– This is a switch that has joined a single IP group and is
accessible from the CS, and it takes on the following characteristics:
It is not a CS or MS of another IP group.
It is connected to the CS through the CS management VLAN.
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Candidate Switch (CaS)
– This is a switch that is ready to join a SIM group but is not
yet a member of the SIM group. The Candidate Switch may join the SIM group through an
automatic function of the DES-3550, or by manually configuring it to be a MS of a SIM
group. A switch configured as a CaS is not a member of a SIM group and will take on the
following characteristics:
It is not a CS or MS of another Single IP group.
It is connected to the CS through the CS management VLAN
The following rules also apply to the above roles:
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Each device begins in a Commander state.
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CS’s must change their role to CaS and then to MS, to become a MS of a SIM
group. Thus, the CS cannot directly be converted to a MS.
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The user can manually configure a CS to become a CaS.
A MS can become a CaS by:
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Being configured as a CaS through the CS.
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If report packets from the CS to the MS time out.
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The user can manually configure a CaS to become a CS.
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The CaS can be configured through the CS to become a MS.
After configuring one switch to operate as the CS of a SIM group, additional DES-3550
switches may join the group either by an automatic method or by manually configuring the
switch to be a MS. The CS will then serve as the in band entry point for access to the MS. The
CS’s IP address will become the path to all MS’s of the group and the CS’s Administrator’s
password, and/or authentication will control access to all MS’s of the SIM group.
With SIM enabled, the applications in the CS will redirect the packet instead of executing the
packets. The applications will decode the packet from the administrator, modify some data,
and then send it to the MS. After execution, the CS may receive a response packet from the
MS, which it will encode and send it back to the administrator.
When a CS becomes a MS, it automatically becomes a member of the first SNMP community
(include read/write and read only) to which the CS belongs. However, if a MS has its own IP
address, it can belong to SNMP communities to which other switches in the group, including
the CS, do not belong.
SIM Using the Web Interface
All DES-3550 switches are set as
Candidate (CaS)
switches, as their factory default
configuration and the Single IP Management feature will be disabled. To enable SIM for the
Switch using the Web interface, go to the
Single IP Management
folder and click the
SIM
Settings
link, revealing the following window.