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User Manual for the NETGEAR 7300S Series Layer 3 Managed Switch Software
Quality of Service (QoS) Commands
11-49
202-10088-01, March 2005
Queue IdQueue identification number
An interface supports n queues numbered 0 to (n-1).
The number n is platform dependent and corresponds to the num-
ber of supported queues (traffic classes).
The following information is repeated for each drop precedence level defined for the preceding
Queue Id.
Drop Precedence Level
The drop precedence level for this queue, from 1 to p.
The spe-
cific p value is platform dependent.
Tail Drop Threshold
The tail drop queue threshold value for this drop precedence
level, expressed in sixteenths of the overall device queue size
(e.g., 0/16, 1/16, 2/16…, 16/16).
This is a configured value.
Page 312 / 400
User Manual for the NETGEAR 7300S Series Layer 3 Managed Switch Software
11-50
Quality of Service (QoS) Commands
202-10088-01, March 2005
Page 313 / 400
User Manual for the NETGEAR 7300S Series Layer 3 Managed Switch Software
Managing Switch Stacks
12-1
202-10088-01, March 2005
Chapter 12
Managing Switch Stacks
This chapter describes the concepts and recommended operating procedures to manage
FSM7328S or FSM7352S switches running Release 4.0.0 and includes the following sections:
•
Initial installation and power-up of a stack
•
Removing a unit from the stack
•
Adding a unit to an operating stack
•
Replacing a stack member with an new unit
•
Renumbering stack members
•
Moving the master to a different unit in the stack
•
Removing a master unit from an operating stack
•
Merging two operational stacks
•
Pre configuration
•
Upgrading firmware
•
Migration of configuration with a firmware upgrade
Understanding Switch Stacks
A
switch stack
is a set of up to eight Ethernet switches connected through their stacking ports. One
of the switches controls the operation of the stack and is called the stack master. The
stack master
and the other switches in the stack are
stack members
. The stack members use stacking technology
to behave and work together as a unified system. Layer 2 and Layer 3 protocols present the entire
switch stack as a single entity to the network.
The stack master is the single point of stack-wide management. From the stack master, you
configure:
•
System-level (global) features that apply to all stack members
•
Interface-level features for all interfaces on any stack member
Page 314 / 400
User Manual for the NETGEAR 7300S Series Layer 3 Managed Switch Software
12-2
Managing Switch Stacks
202-10088-01, March 2005
A switch stack is identified in the network by its network IP address. The network IP address is
assigned according to the MAC address of the stack master. Every stack member is uniquely
identified by its own
stack member number
.
All stack members are eligible stack masters. If the stack master becomes unavailable, the
remaining stack members participate in electing a new stack master from among themselves. A set
of factors determine which switch is elected the stack master. These factors are:
1.
The switch who is master always has priority to retain the role of master
2.
Assigned priority
3.
MAC address
If the master cannot be selected by (1), then (2) is used. If (2) does not resolve which stack member
becomes stack master, then (3) is used.
The stack master contains the saved and running configuration files for the switch stack. The
configuration files include the system-level settings for the switch stack and the interface-level
settings for all stack members. Each stack member retains a copy of the saved file for backup
purposes.
If the master is removed from the stack, another member will be elected master, and will then run
from that saved configuration.
You can use these methods to manage switch stacks:
•
Stack web interface
•
Command line interface (CLI) over a serial connection to the console port of the master
•
A network management application through the Simple Network Management Protocol
(SNMP)
Switch Stack Membership
A switch stack has up to eight stack members connected through their stacking ports. A switch
stack always has one stack master.
A standalone switch is a switch stack with one stack member that also operates as the stack master.
You can connect one standalone switch to another to create a switch stack containing two stack
members, with one of them being the stack master. You can connect standalone switches to an
existing switch stack to increase the stack membership.
Page 315 / 400
User Manual for the NETGEAR 7300S Series Layer 3 Managed Switch Software
Managing Switch Stacks
12-3
202-10088-01, March 2005
If you replace a stack member with an identical model, the new switch functions with exactly the
same configuration as the replaced switch, assuming that the new switch is using the same member
number as the replaced switch. For information about the benefits of preconfiguring a switch
stack, see
“Preconfiguration” on page 12-15
.
The operation of the switch stack continues uninterrupted during membership changes unless you
remove the stack master or you add powered-on standalone switches or switch stacks.
•
Adding powered-on switches (merging) causes the stack masters of the merging switch stacks
to elect a stack master from among themselves. The re-elected stack master retains its role and
configuration and so do its stack members. All remaining switches, including the former stack
masters, reload and join the switch stack as stack members. They change their stack member
numbers to the lowest available numbers and use the stack configuration of the re-elected
stack master. Therefore, when you merge two powered stacks, you cannot control which unit
becomes stack master and which configuration is used. For these reasons, it is recommended
that powered switches be powered down before adding to an existing operating stack.
•
Removing powered-on stack members can cause the switch stack to divide (partition) into two
or more switch stacks, each with the same configuration. However, if cabled properly, the
switch stack should not divide.
–
If the switch stack divides, and you want the switch stacks to remain separate, change the
IP address or addresses of the newly created switch stacks.
–
If you did not intend to partition the switch stack:
•
Power off the newly created switch stacks
•
Reconnect them to the original switch stack through their stacking ports
•
Power on the switches

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