IES-1248-51 User’s Guide
170
Chapter 24 Spanning Tree Protocol
Bridge Priority
Bridge priority is used in determining the root switch, root port and designated
port. The switch with the highest priority (lowest numeric value) becomes the
STP root switch. If all switches have the same priority, the switch with the lowest
MAC address will then become the root switch. The allowed range is 0 to 61440.
The lower the numeric value you assign, the higher the priority for this bridge.
Bridge Priority determines the root bridge, which in turn determines Hello Time,
Max Age and Forwarding Delay.
Hello Time
This is the time interval in seconds between BPDU (Bridge Protocol Data Units)
configuration message generations by the root switch. The allowed range is 1 to
10 seconds.
MAX Age
This is the maximum time (in seconds) a switch can wait without receiving a
BPDU before attempting to reconfigure. All switch ports (except for designated
ports) should receive BPDUs at regular intervals. Any port that ages out STP
information (provided in the last BPDU) becomes the designated port for the
attached LAN. If it is a root port, a new root port is selected from among the
switch ports attached to the network. The allowed range is 6 to 40 seconds.
Forwarding Delay
This is the maximum time (in seconds) a switch will wait before changing states.
This delay is required because every switch must receive information about
topology changes before it starts to forward frames. In addition, each port needs
time to listen for conflicting information that would make it return to a blocking
state; otherwise, temporary data loops might result. The allowed range is 4 to 30
seconds.
As a general rule:
Note:
2 * (Forward Delay - 1) >= Max Age >= 2 * (Hello Time + 1)
Port
This field identifies the Ethernet port.
Active
Select this check box to activate STP on this port.
Priority
Configure the priority for each port here.
Priority decides which port should be disabled when more than one port forms a
loop in a switch. Ports with a higher priority numeric value are disabled first. The
allowed range is between 0 and 255 and default value is 128.
Path Cost
Path cost is the cost of transmitting a frame on to a LAN through that port. It is
assigned according to the speed of the bridge. The slower the media, the higher
the cost.
Apply
Click
Apply
to save your changes to the IES-1248-51’s volatile memory. The
IES-1248-51 loses these changes if it is turned off or loses power, so use the
Config Save
link on the navigation panel to save your changes to the non-
volatile memory when you are done configuring.
Cancel
Click
Cancel
to begin configuring this screen afresh.
Table 40
Spanning Tree Protocol (continued)
LABEL
DESCRIPTION
Summary of Contents for IES-1248-51
Page 1: ...IES 1248 51 ADSL2 IP DSLAM User s Guide Version 3 51 ABQ 1 3 2006 ...
Page 4: ...IES 1248 51 User s Guide 4 Interference Statements and Warnings ...
Page 22: ...IES 1248 51 User s Guide 22 Table of Contents Index 379 ...
Page 30: ...IES 1248 51 User s Guide 30 List of Figures ...
Page 34: ...IES 1248 51 User s Guide 34 List of Tables ...
Page 48: ...IES 1248 51 User s Guide 48 Chapter 2 Hardware Installation ...
Page 62: ...IES 1248 51 User s Guide 62 Chapter 4 MDF Connections ...
Page 73: ...IES 1248 51 User s Guide Chapter 7 Introducing the Web Configurator 73 Figure 29 Logout ...
Page 74: ...IES 1248 51 User s Guide 74 Chapter 7 Introducing the Web Configurator ...
Page 88: ...IES 1248 51 User s Guide 88 Chapter 9 Home and Port Statistics Screens ...
Page 90: ...IES 1248 51 User s Guide 90 Chapter 10 System Information Figure 44 System Info ...
Page 98: ...IES 1248 51 User s Guide 98 Chapter 12 User Account ...
Page 104: ...IES 1248 51 User s Guide 104 Chapter 13 Switch Setup ...
Page 106: ...IES 1248 51 User s Guide 106 Chapter 14 IP Setup ...
Page 126: ...IES 1248 51 User s Guide 126 Chapter 16 xDSL Port Setup ...
Page 140: ...IES 1248 51 User s Guide 140 Chapter 17 xDSL Profiles Setup ...
Page 154: ...IES 1248 51 User s Guide 154 Chapter 19 VLAN ...
Page 188: ...IES 1248 51 User s Guide 188 Chapter 28 2684 Routed Mode ...
Page 192: ...IES 1248 51 User s Guide 192 Chapter 30 Syslog ...
Page 210: ...IES 1248 51 User s Guide 210 Chapter 33 Alarm ...
Page 240: ...IES 1248 51 User s Guide 240 Chapter 38 Commands ...
Page 256: ...IES 1248 51 User s Guide 256 Chapter 40 Alarm Commands ...
Page 262: ...IES 1248 51 User s Guide 262 Chapter 41 DHCP Relay Commands ...
Page 282: ...IES 1248 51 User s Guide 282 Chapter 44 IGMP Commands ...
Page 286: ...IES 1248 51 User s Guide 286 Chapter 45 Packet Filter Commands ...
Page 292: ...IES 1248 51 User s Guide 292 Chapter 46 IP Commands ...
Page 302: ...IES 1248 51 User s Guide 302 Chapter 48 SNMP ...
Page 338: ...IES 1248 51 User s Guide 338 Chapter 49 ADSL Commands ...
Page 358: ...IES 1248 51 User s Guide 358 Chapter 50 Virtual Channel Management ...
Page 370: ...IES 1248 51 User s Guide 370 Chapter 51 Troubleshooting ...
Page 378: ...IES 1248 51 User s Guide 378 ...