Dell Force10 MXL Blade Configuration Manual page 469

• Max-age is the length of time the bridge maintains configuration information before it refreshes that
information by recomputing the RST topology.
Note: Dell Force10 recommends that only experienced network administrators change the RST group
parameters. Poorly planned modification of the RSTG parameters can negatively impact network
performance.
Table 27-2 lists the default values for RSTP.
Table 27-2. RSTP Default Values
RSTP Parameter
Forward Delay
Hello Time
Max Age
Port Cost
Port Priority
To change these parameters, use the following commands, on the root bridge:
Task
Change the forward-delay parameter.
• Range: 4 to 30
• Default: 15 seconds
Change the hello-time parameter.
Note: With large configurations (especially those with more ports) Dell
Force10 recommends that you increase the hello-time.
Range: 1 to 10
Default: 2 seconds
Change the max-age parameter.
Range: 6 to 40
Default: 20 seconds
To view the current values for global parameters, use the
privilege mode (Figure
40-Gigabit Ethernet interfaces
10-Gigabit Ethernet interfaces
Port Channel with two 40-Gigabit Ethernet interfaces
Port Channel with two 10-Gigabit Ethernet interfaces
27-5).
Command Syntax
forward-delay seconds
hello-time seconds
max-age seconds
command from EXEC
show spanning-tree rstp
Rapid Spanning Tree Protocol (RSTP) | 467
Default Value
15 seconds
2 seconds
20 seconds
1400
2000
600
1800
128
Command Mode
PROTOCOL
SPANNING TREE
RSTP
PROTOCOL
SPANNING TREE
RSTP
PROTOCOL
SPANNING TREE
RSTP