Simply put,Allied Telesyn Single IP Management is a concept that will stack switches together over Ethernet instead of using stacking ports or modules. Switches

using Single IP Management (labeled here as SIM) must conform to the following rules:

•

SIM is an optional feature on the Switch and can easily be enabled or disabled. SIM grouping has no effect on the normal operation of the Switch in

the user's network.

•

There are three classifications for switches using SIM.The Commander Switch (CS), which is the master switch of the group, Member Switch (MS),

which is a switch that is recognized by the CS a member of a SIM group, and a Candidate Switch (CaS), which is a switch that has a physical link to the

SIM group but has not been recognized by the CS as a member of the SIM group.

•

A SIM group can only have one Commander Switch (CS).

•

All switches in a particular SIM group must be in the same IP subnet (broadcast domain). Members of a SIM group cannot cross a router.

•

A SIM group accepts up to 32 switches (numbered 0-31), including the Commander Switch (numbered 0).

•

There is no limit to the number of SIM groups in the same IP subnet (broadcast domain), however a single switch can only belong to one group.

•

If multiple VLANs are configured, the SIM group will only utilize the default VLAN on any switch.

•

SIM allows intermediate devices that do not support SIM.This enables the user to manage a switch that are more than one hop away from the CS.

The SIM group is a group of switches that are managed as a single entity.The switch may take on three different roles:

Commander Switch (CS) – This is a switch that has been manually configured as the controlling device for a group, and takes on the following

characteristics:

•

It has an IP Address.

•

It is not a command switch or member switch of another Single IP group.

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.

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 Switch, 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:

Each device begins in a Commander state.

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.

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.

5.The user can manually configure a CaS to become a CS.

After configuring one switch to operate as the CS of a SIM group, additional switches may join the group by either 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, 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 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.

The Allied Telesyn Single IP Management commands in the Command Line Interface (CLI) are listed (along with the appropriate parameters) in the following

table.

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