D-Link Xstack DES-3528 Series Reference Manual page 53

xStack® DES-3528/DES-3552 Series Layer 2 Managed Stackable Fast Ethernet Switch Web UI Reference Guide
a. It has an IP Address.
b. It is not a command switch or member switch of another Single IP group.
c. It is connected to the member switches through its management VLAN.
2. 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:
a. It is not a CS or MS of another IP group.
b. It is connected to the CS through the CS management VLAN.
3. 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 of the Switch 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:
a. It is not a CS or MS of another Single IP group.
b. It is connected to the CS through the CS management VLAN
The following rules also apply to the above roles:
• Each device begins in a Candidate state.
• CSs 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.
• The user can manually configure a CS to become a CaS.
• A MS can become a CaS by:
• Being configured as a CaS through the CS.
If report packets from the CS to the MS time out.
•
• The user can manually configure a CaS to become a CS
• 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, additionalDES-3528/DES-3552 Series switches
may join the group 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 CaS becomes a MS, it automatically becomes a member of the first SNMP community (includes 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.
Upgrade to v1.61
To better improve SIM management, the DES-3528/DES-3552 Series switches have been upgraded to version
1.61 in this release. Many improvements have been made, including:
1. The Commander Switch (CS) now has the capability to automatically rediscover member switches that
have left the SIM group, either through a reboot or web malfunction. This feature is accomplished through
the use of Discover packets and Maintenance packets that previously set SIM members will emit after a
reboot. Once a MS has had its MAC address and password saved to the CS's database, if a reboot occurs
in the MS, the CS will keep this MS information in its database and when a MS has been rediscovered, it
will add the MS back into the SIM tree automatically. No configuration will be necessary to rediscover these
switches.
There are some instances where pre-saved MS switches cannot be rediscovered. For example, if the Switch is still
powered down, if it has become the member of another group, or if it has been configured to be a Commander
Switch, the rediscovery process cannot occur.
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