Ntdp Timer Port-Delay - 3Com 5500-EI PWR Reference Manual

Network congestion may occur if large amount of topology response packets reach the collecting
device in a short period. To avoid this case, each collected switch in the network delays for a period
before it forwards a received topology collection request through each NTDP-enabled port.
You can use the ntdp timer hop-delay command to set the delay on a collecting switch. The delay
value you set by the command is carried in the topology collection requests sent by the collecting switch,
and is used by collected devices to determine how long they should wait before they can forward the
received topology collection requests.
Examples
# Set the delay for collected switches to forward topology collection requests to 300 ms.
<aaa_0.Sysname> system-view
System View: return to User View with Ctrl+Z.
[aaa_0.Sysname] ntdp timer hop-delay 300

ntdp timer port-delay

Syntax
ntdp timer port-delay time
undo ntdp timer port-delay
View
System view
Parameters
time: Port forwarding delay in milliseconds. This argument ranges from 1 to 100.
Description
Use the ntdp timer port-delay command to configure the topology request forwarding delay between
two ports, that is, the interval at which the device forwards the topology requests through the
NTDP-enabled ports one after another.
Use the undo ntdp timer port-delay command to restore the default port forwarding delay.
By default, the port forwarding delay is 20 ms.
Network congestion may occur if large amount of topology response packets reach the collecting
device in a short period. To avoid this case, after a collected switch forwards a received topology
collection request through a port, it delays for a period before it forwards the request through the next
port. You can use the ntdp timer port-delay command to set the delay.
You can use the command on a collecting switch. The delay value you set by the ntdp timer port-delay
command is carried in the topology collection requests sent by the collecting switch, and is used by
collected devices to determine the topology collection request forwarding delay between two ports.
Examples
# Set the port forwarding delay for collected switches to forward NTDP requests to 40 ms.
<aaa_0.Sysname> system-view
System View: return to User View with Ctrl+Z.
[aaa_0.Sysname] ntdp timer port-delay 40
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