Siemens S323, S223 Bridge Protocol Data Unit Configuration, Hello Time, Max Age, Forward Delay

UMN:CLI	User Manual
	SURPASS hiD 6615 S223/S323 R1.5

To clear configured Restarting Protocol Migration, use the following command.

Command	Mode	Description
stp clear-detected-protocol	Bridge	Configures restarting protocol migration function.
PORTS

8.3.9Bridge Protocol Data Unit Configuration

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Bridge Protocol Data Unit (BPDU) is a transmission message in LAN in order to configure, maintain the configuration for STP/RSTP/MSTP. Switches that STP is configured ex- change their information BPDU to find best path. MSTP BPDU is general STP BPDU hav- ing additional MST data on it’s end. MSTP part of BPDU does not rest when it is out of Region.

•Hello Time

Hello time decides an interval time when a switch transmits BPDU. It can be config- ured from 1 to 10 seconds. The default is 2 seconds.

•Max Age

Root switch transmits new information every time based on information from another switches. However, if there are many switches on network, it takes lots of time to transmit BPDU. And if network status is changed while transmitting BPDU, this in formation is useless. To get rid of useless information, max age is identified in each information.

•Forward Delay

Switches find location of another switches connected to LAN though received BPDU and transmit packets. Since it takes certain time to receive BPDU and find the loca- tion before transmitting packet, switches send packet at regular interval. This interval time is named forward delay.

The configuration for BPDU is applied as selected in force-version. The same commands are used for STP, RSTP, MSTP, PVSTP and PVRSTP.

8.3.9.1Hello Time

Hello time decides an interval time when a switch transmits BPDU. To configure hello time, use the following command.

Command	Mode		Description
		Configures hello time to transmit the message in STP,
stp mst hello-time <1-10>		RSTP and MSTP:
	Bridge	1-10: set the hello time. (default: 2)
stp pvst hello-time		Configures hello	time to transmit the message in
		PVSTP and PVRSTP:
VLAN-RANGE <1-10>
		1-10: set the hello time. (default: 2)

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