The difference of configuring CAR at interface view and global on S series switch box device

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For the S series frame switch, the interface configuration of the CAR only limit the interface speed. When configure CAR at system view and define slot parameter, all interface of this slot will share this CAR. When configure CAR at sysetem view without defining slot parameter, all interfaces on every board share this CAR.
For example, configured inbound CAR as 5000kbit/s:
- If this is applied to the interface, the speed limit is only for this interface. This interface can receive up to 5000kbit/s.
- If this is configured at system view and specified slot parameter, the sum rate of all the interfaces on this slot on the board is 5000kbit/s;
- If this is configured at system view without specified slot parameter, the rate at all the interfaces on this device receive packets is up to 5000kbit/s.

Other related questions:
Differences between CARs configured globally and on an interface of an S series modular switch
For S series modular switches, the committed access rate (CAR) configured on an interface only limits the rate of packets on this interface, while the CAR configured globally limits the rate of packets on all interfaces of a specified card if the slot ID is specified, and limits the rate of packets on all interfaces of each card if the slot ID is not specified. Assume that the CAR for inbound packets is set to 5000 kbit/s. - If the CAR is applied to an interface, the maximum rate for the interface to receive packets is 5000 kbit/s. - If the CAR is applied globally and the slot ID is specified, the sum of the maximum rates for all interfaces on the cards in the slot to receive packets is 5000 kbit/s. - If the CAR is applied globally and the slot ID is not specified, the sum of the maximum rates for all interfaces on each card to receive packets is 5000 kbit/s.

How to configure CAR parameters for S series switches
When the S-series switch (except the S1700) is configured with a speed limit, you need to configure parameters such as cir cir-value and cbs cbs-value, where cir cir-value is the guaranteed rate of information, that is, the average rate that can be guaranteed. Cbs cbs-value means Commit burst size, that is, instantly through the promised burst traffic. For example, if you want to configure a speed limit of 4 Mbit / s, configure cir-value = 4 * 1024 kbit / s = 4096 kbit / s. Cbs-value is configured to be 100-200 times the cir-value. If the user does not configure cbs-value, the device will automatically specify it as the default.

The dhcp select global command is added to the VLANIF interface view after S series switch is upgraded
On fixed switches running V100R003, the DHCP server function (the dhcp select global command) is enabled in the VLANIF view by default, and there is no buildrun information. On fixed switches running V100R005 or a later version, the DHCP server function is disabled in the VLANIF view by default. To ensure compatibility with earlier versions, the DHCP server function is enabled in the VLANIF view after an upgrade. If the DHCP function (the dhcp enable command) is disabled globally, the dhcp select global command will not take effect, and you can manually delete this command. If the DHCP function (the dhcp enable command) is enabled globally after the upgrade, contact Huawei technical support for help before deleting the dhcp select global command.

The method of S series switches to view the IP address of the interface
S series switches (except S1700) There are two ways to view the IP address of the specified interface: - Run the "display ip interface brief [interface-type [interface-number]]" command in any view to check the IP configuration information of the interface. - Run the "display this" command to check the IP address configured on the interface.

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