What is the default LACP system priority and election rule ?

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LACP system priority is 32768, and the device with the smaller LACP system ID is used as the Actor.

Other related questions:
What are DR, BDR, DR other and election rules
DR means designated router. BDR means backup designated router. DR Other indicates a device that is neither a DR or a BDR. The DR advertises link-state advertisements (LSAs) to all the devices in the network. The DR election rules are as follows: When going Up, an interface sends Hello messages and enters the waiting state. In the waiting state, a waiting timer is triggered. The waiting timer duration is the same as the dead timer duration. By default, the waiting timer duration is 40 seconds, which cannot be changed. Before the waiting timer is triggered, sent Hello messages carry no DR or BDR field. In the waiting state, if a received Hello message carries the DR and BDR fields, the DR and BDR are accepted directly without any election triggered, and neighbor state synchronization starts, directly exiting the waiting state. Assume that a DR and a BDR exist on the network. Any device newly connected to the network will accept the DR and BDR that exist on the network regardless of the router ID of the device. If the DR fails and goes down, the BDR takes over the role of the DR and the remaining devices whose priority is greater than 0 compete to become the new BDR. DR election rules are used to elect a DR only when devices with different router IDs or configured with different DR priorities are started at the same time. The election rules are that the device with the highest DR priority is elected as DR and the device with the second highest DR priority as BDR. A device with a DR priority of 0 can be a DR Other only. In the case of the same priority, the device with the greatest router ID is elected as DR, the device the second greatest router ID becomes the BDR, and other devices are DR Others.

How can I configure LACP priority on CE switches
LACP priorities include system and interface priorities. 1. The system priority determines the Actor and Partner. The device with a higher system priority functions as the Actor and the active interfaces are selected based on the Actor. 2. The interface priority determines selection of active interfaces. The interfaces with a higher priority are selected as active interfaces. A smaller value indicates a higher priority. # Configure the LACP system priority. system-view [~HUAWEI] lacp priority 10 [*HUAWEI] commit# # Configure the LACP priority for 10GE1/0/1. system-view [~HUAWEI] interface eth-trunk 1 [*HUAWEI-Eth-Trunk1] trunkport 10ge 1/0/1 [*HUAWEI-Eth-Trunk1] mode lacp-static //Before configuring the interface priority, ensure that the interface has been added to an Eth-Trunk in LACP mode. [*HUAWEI-Eth-Trunk1] quit [*HUAWEI] interface 10ge 1/0/1 [*HUAWEI-10GE1/0/1] lacp priority 1 [*HUAWEI-10GE1/0/1] commit

OSPF DR and BDR election rules
On broadcast and NBMA networks, the DR and BDR selected by OSPF are electoral, lifelong, and hereditary. Electoral DR and BDR are not designated manually. Instead, they are elected by all the routers on a network segment. When the DR and BDR are elected on a network segment and are lifelong, each router newly added to the network segment does not replace the existing the DR or BDR even if the router has a higher priority. If the DR and BDR are hereditary, the BDR replaces the DR when the DR is faulty and other routers compete to be the BDR. The process of DR/BDR election on a broadcast or an NMBA link is as follows: 1. After interfaces on a device are Up, the device sends Hello packets and enters the Waiting state. The waiting timer value is the same as that of the dead timer. The default value is 40s and cannot be modified. 2. Before the waiting timer is triggered, the Hello packets sent by the device do not contain the DR and BDR fields. After the device enters the Waiting state, if it sends Hello packets containing the DR and BDR fields, it acknowledges the DR and BDR existing on the network and does not trigger an election. The device changes its state from Waiting and starts synchronization with a neighbor. 3. If the DR and BDR already exist on the network, an added device acknowledges the DR and BDR. In such a case, DR/BDR election is not performed even if this device has a largest router ID or top DR priority. 4. When the DR is Down due to faults, the BDR replaces the DR and another device of a priority higher than 0 becomes the new BDR. 5. DR election is performed only when devices with different router IDs or DR priorities start simultaneously. The election rules are as follows: The device with the highest priority functions as the DR, and the device with the second highest priority functions as the BDR. A device with the priority of 0 can only function as the DR Other. If all devices have the same priority, the device with the largest router ID functions as the DR, the device with the second largest router ID functions as the BDR, and the others as DR Others. For more information about OSPF DR election and BDR election, click 问鼎OSPF(2) .

How to set the LACP priority based on the rate
By default, the system selects active interfaces based on interface priorities. However, low-speed member interfaces may be selected as active interfaces because of their high priorities. To select high-speed member interfaces, run the lacp selected speed command to configure the system to select active interfaces based on the interface rate.

How does an S series switch process packets when Layer 2 multicast references an ACL
In Layer 2 multicast, three functions need to reference the ACL. After an ACL is referenced, packets are processed based on ACL rules. If no rule is configured, packets are processed as follows: - IGMP snooping group policy: In V200R001 and earlier versions, the default rule is permit. In V200R002 and later versions, if default-permit is not configured, the default rule is deny; if default-permit is configured, the default rule is permit. - IGMP snooping prompt leave: In V200R001 and earlier versions, the default rule is permit. In V200R002 and later versions, if default-permit is not configured, the default rule is deny; if default-permit is configured, the default rule is permit. - IGMP snooping SSM policy: The default rule is deny.

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