Specifications

Basic Switch Configuration 191
Chapter 9
2. Follow the rules of operation below.
Rules of Operating a Virtual Switch
1. When a single SC is present in the chassis, it will try to use all the line
cards present. SC-0 can use any combination of Line Cards (LCs), for
example: LC-1, LC-2 or LC3.
SC-1 can use any combination of LC-2 and LC-3.
2. When two SCs are present in the chassis, SC-0 is dedicated to LC-2 only
and SC-1 is dedicated to LC-3 only. In this case, there are two Gigabits of
bandwidth available between each LC and SC pairs.
Hot Swapping Support
Hot swapping is fully supported. Any cards can be removed or added at any
time. For example: If SC-0, and LC-2 and LC-3 are installed, then SC-0 uses all
the LC-2 and LC-3 ports. When SC-1 is inserted, SC-0 immediately releases
control of LC-3, and SC-1 will boot and take over control of LC-3.
Traffic between SC-0 and LC-2 is not interrupted.
If SC-0 is then removed, SC-1 takes over LC-2 and controls LC-2 and LC-3,
again without traffic interruption.
NOTE—Port numbering is fixed by slot numbers.This means that in a fully
loaded system, SC-0 will use ports 2/ and SC-1 will use ports 3/.
Dual SC Operation Example
To illustrate this dual SC operation:
1. Install SC-0, LC-2 and LC-3. Configure Layer-2 and Layer-3 on ports 2/
and 3/.
2. Remove SC-0.
3. Install SC-1, LC-2 and LC-3. Configure Layer-2 and Layer-3 on ports 2/
and 3/.
4. Install all the cards. SC-0 will use only LC-2 and SC-l will use only LC-3.
However, if one of the SC is removed, the other SC will take over an use
the previously set configuration.
Resetting the Other SC
The reload-peer-SC command allows one SC to reset the other SC in a dual SC
configuration. This does not affect the SC on which the command is executed
(and the LC it controls).