1-42
Parameters
centi-seconds
: Hello time to be set, in the range of 100 to 1,000 (in centiseconds).
Description
Use the
stp timer hello
command to set the hello time of the switch.
Use the
undo stp timer hello
command to restore the hello time of the switch to the default value.
By default, the hello time of the switch is 200 centiseconds.
A root bridge regularly sends out configuration BPDUs to maintain the stability of existing spanning
trees. If the switch does not receive BPDU packets in a specified period, spanning trees will be
recalculated because BPDU packets time out. When a switch becomes a root bridge, it regularly sends
BPDUs at the interval specified by the hello time you have configured on it. The other none-root-bridge
switches adopt the interval specified by the hello time.
As for the configuration of the three time-related parameters (namely, the hello time, forward delay, and
max age parameters), the following formulas must be met to prevent frequent network jitter.
2 × (forward delay – 1 second) >= max age
Max age >= 2 × (hello time + 1 second)
You are recommended to specify the network diameter of the switched network and the hello time by
using the
stp root primary
or
stp root secondary
command. After that, the three proper time-related
parameters are automatically calculated by MSTP.
Related commands:
stp timer forward-delay
,
stp timer max-age
,
stp bridge-diameter
.
Examples
# Set the hello time to 400 centiseconds.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] stp timer hello 400
stp timer max-age
Syntax
stp timer max-age
centi-seconds
undo stp
timer max-age
View
System view
Parameters
centi-seconds
: Max age to be set, in the range of 600 to 4,000 (in centiseconds).
Description
Use the
stp timer max-age
command to set the max age of the switch.
Use the
undo stp timer max-age
command to restore the default max age.
By default, the max age of a switch is 2,000 centiseconds.
Summary of Contents for 5500-EI PWR
Page 43: ...2 6...
Page 76: ...1 17...
Page 228: ...ii stp transmit limit 1 44 vlan mapping modulo 1 45 vlan vpn tunnel 1 46...
Page 477: ...5 24 Sysname vlan 2 Sysname vlan2 service type multicast...
Page 503: ...2 3 System View return to User View with Ctrl Z Sysname dot1x url http 192 168 19 23...
Page 519: ...iii...
Page 597: ...2 2 security policy server 192 168 0 1 user name format without domain...
Page 648: ...1 9 Examples Clear static ARP entries Sysname reset arp static...
Page 663: ...4 3 Sysname resilient arp interface vlan interface 2...
Page 767: ...1 28 From 12 00 Jan 1 2008 to 12 00 Jun 1 2008...
Page 1111: ...ii xmodem get 3 18...
Page 1314: ...A 44 Z...