Home » Cisco » 350-080 » Which statements are true about LACP port priority?
Each port that is configured to use LACP has an LACP port priority. Which statements are true about LACP port priority? (Choose three.)
A. Port priority value can be configured between 1 and 65535.
B. A higher port priority value means a higher priority of LACP.
C. Port priority can be configured so that specific links can be chosen as active links rather than the hot standby links within the port channel.
D. LACP uses the port priority with the port number to form the port identifier.
E. LACP Port priority default value should always be changed
Correct Answer: ACD
Explanation/Reference:
Explanation:
LACP uses the following parameters:
LACP system priority — Each system that runs LACP has an LACP system priority value. You can accept the default value of 32768 for this parameter, or you can configure a value between 1 and 65535. LACP uses the system priority with the MAC address to form the system ID and also uses the system priority during negotiation with other devices. A higher system priority value means a lower priority.
LACP port priority — Each port configured to use LACP has an LACP port priority. You can accept the default value of 32768 for the LACP port priority, or you can configure a value between 1 and 65535. LACP uses the port priority with the port number to form the port identifier. LACP uses the port priority to decide which ports should be put in standby mode when there is a limitation that prevents all compatible ports from aggregating and which ports should be put into active mode. A higher port priority value means a lower priority for LACP. You can configure the port priority so that specified ports have a lower priority for LACP and are most likely to be chosen as active links, rather than hot-standby links.
LACP administrative key — LACP automatically configures an administrative key value equal to the channel-group number on each port configured to use LACP. The administrative key defines the ability of a port to aggregate with other ports. A port’s ability to aggregate with other ports is determined by these factors:
– Port physical characteristics, such as the data rate, the duplex capability, and the point-to-point or shared medium state
– Configuration restrictions that you establish
Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/configuration/guide/cli/CLIConfigurationGuide/EtherChannel.html
(LACP ID Parameters)