Differences between CARs configured globally and on an interface of an S series modular switch

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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.

Other related questions:
The difference of configuring CAR at interface view and global on S series switch box device
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.

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.

Can S series modular switches of different versions establish a cluster
CSS technology provides an automatic software loading mechanism. Member switches do not have to run the same software version, and they can set up a CSS as long as the software versions running on the member switches are compatible with one another. If software version running on the standby switch is different from that on the master switch, the standby switch downloads the system software from the master switch, restarts with the new system software, and joins the CSS again.

How to configure MAD on S series modular switches
For S series switches, when a cluster splits, two master switches may exist on the network, affecting network operations. In this case, you can configure MAD in direct mode for specified ports in a CSS to reduce the impact of a cluster split on the network. Alternatively, you can configure MAD in relay mode on specified Eth-Trunk ports. 1. Configuring MAD in direct mode MAD in direct mode can only be configured on Layer 2 Ethernet ports, and ports must be in Up state. # Configure MAD in direct mode on GigabitEthernet1/2/0/0. [CSS] interface gigabitethernet 1/2/0/0 [CSS-GigabitEthernet1/2/0/0] mad detect mode direct //Command line format in V200R002C00 and earlier versions: dual-active detect mode direct # Configure MAD in direct mode on GigabitEthernet2/10/0/0. [CSS] interface gigabitethernet 2/10/0/0 [CSS-GigabitEthernet2/10/0/0] mad detect mode direct //Command line format in V200R002C00 and earlier versions: dual-active detect mode direct 2. Configuring MAD in relay mode # In the CSS, configure MAD in relay mode for the inter-device Eth-Trunk. [CSS] interface eth-trunk 20 [CSS-Eth-Trunk20] mad detect mode relay //Command line format in V200R002C00 and earlier versions: dual-active detect mode relay [CSS-Eth-Trunk20] quit [CSS] quit # Configure MAD in relay mode on SwitchC. [SwitchC] interface eth-trunk 20 [SwitchC-Eth-Trunk20] mad relay //Command line format in V200R002C00 and earlier versions: dual-active relay

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