What is the function of interface priorities

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The port priority command sets the interface priorities, that is, specifies the default priorities of incoming packets on the interface. AR series routers send packets to different queues based on the interface priority. By default, the AR interface does not trust packet priorities. Packets enter queues according to the interface priority.


If all packets enter queues according to the interface priority, all packets on an interface enter the same queue. Differentiated services cannot be provided. Using the trust command, you can specify the priority to be mapped for packets, that is, search for a priority mapping to the packet priority in the priority mapping table.

-The AR120&AR150&AR160&AR200&AR500 series and AR1200 series send packets to different interface queues based on the mapped 802.1p priorities, and use the queue scheduling to provide services for packets with different priorities.

-On AR2200 series,
--From V200R001C00, the device sends packets to different interface queues based on the mapped 802.1p priorities, and use the queue scheduling to provide services for packets with different priorities.
--From V200R003C00, the AR2204 or AR2220E sends packets to different interface queues based on the mapped 802.1p priorities, and use the queue scheduling to provide services for packets with different priorities. While the AR2201, AR2202, AR2220, AR2240C and AR2240 send packets to different interface queues based on the mapped local priorities, and use the queue scheduling to provide services for packets with different priorities.

-The AR3200&AR3600 series send packets to different interface queues based on the mapped local priorities, and use the queue scheduling to provide services for packets with different priorities.

Other related questions:
How are interface priorities calculated
The priority of the VGMP group is lowered by 2 only when: -A physical interface in the VGMP group fails. -An Eth-Trunk interface in the VGMP group fails. The failure of a member interface of the Eth-Trunk does not affect the priority of the VGMP group. -A member interface of the VGMP group in a VLAN fails. -A member interface of an IP-Link fails.

What is the function of the cluster priority on S series modular switches
For S series modular switches, the clustering priority of a member switch determines the role of the member switch in role election. A larger value indicates a higher priority and higher probability that the member switch is elected as the master switch. However, if a switch with a high priority starts slowly, it cannot be the master switch. If you want a switch to be the master switch, start the switch first. Election rules for an S series master switch: 1. The switch that starts and enters the single-chassis CSS state first becomes the master switch. 2. If the two switches complete startup at the same time, the switch with a higher priority becomes the master switch. 3. If the two switches complete startup at the same time and have the same priority, the switch with a smaller MAC address becomes the master switch. 4. If the two switches complete startup at the same time and have the same priority and MAC address, the switch with a smaller CSS ID becomes the master switch.

What is the function of the tunnel interface (GRE interface)
The tunnel interface (GRE interface) encapsulates and decapsulates data packets using GRE. The tunnel interface that sends encapsulated packets is called the tunnel source interface, and the one that receives these packets on the peer end is called the tunnel destination interface. Generally, the local WAN interface is used as the tunnel source interface, and the peer WAN interface is used as the tunnel destination interface.

What is the function of the FXS interface of an AR router
The function of the FXS interface of an AR router is described as follows: The FXS interface is used to access the analog devices of users. It works as a physical connector which connects a digital telephone switching system and a user device, such as a POTS telephone or a fax machine.

Configure STP on an interface of the S1728GWR-4P switch
Configure STP on an interface of an S1728GWR-4P switch as follows: 1. Choose Spanning Tree > STP. 2. Select Configure Interface from the Step drop-down list box. 3. Select Configure from the Action drop-down list box. 4. Configure the parameters such as Spanning Tree, Admin Link Type, Priority, and Admin Path Cost. 5. Click Apply.

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