lacp port priority

tringlarido

Hi,

I don't understand response D supposed to be true of question :

Which three statements are true of the Link Aggregation Control Protocol (LACP)? (Choose three.)


A. LACP is used to connect to non-Cisco devices.
C. LACP packets are sent with the command channel-group 1 mode active.
D. Standby interfaces should be configured with a higher priority. !!!!!!!!!!!!!!

My understanding of standby host interface is :
to configure :

switch# configure terminal
switch(config)# interface ethernet 1/5
switch(config-if)# lacp port-priority 2000

and :
The lower the number, the higher the priority. Ports with the highest priorities are designated as the active ports in an aggregate trunk.

=> so why response D is correct ? do they mean a high port-priority value rather than a high priority ? these priorities are quite confusing

thanks

SteveO86

Might be a poorly worked question, whats option B.?

---

Think of it like the spanning the lower the priority the more likely it will be the root bridge


So the lower the LACP port priority value the more likely it will be the active port and the higher the priority value the more likely it will be the standby port. (Or less likely it will be the active port)




Step 5

lacp port-priority value
Example:
Router(config-if)# lacp port-priority 500

Specifies the priority for the physical interface.
•value—Valid range is from 1 to 65535. The higher the number, the lower the priority.




Link Aggregation Control Protocol (LACP) (802.3ad) for Gigabit Interfaces* [Cisco IOS Software Releases 12.2 SB] - Cisco Systems

tringlarido

thanks steve
the full question is

Which three statements are true of the Link Aggregation Control Protocol (LACP)? (Choose three.)
A. LACP is used to connect to non-Cisco devices.
B. LACP packets are sent with the command channel-group 1 mode desirable.
C. LACP packets are sent with the command channel-group 1 mode active.
D. Standby interfaces should be configured with a higher priority.
E. Standby interfaces should be configured with a lower priority.

SteveO86

Yea B is wrong

D is right as well, the higher the priority value the more likely it will be the standby. When the question refers to the priority they are referring to the priority value. (I assume)

tringlarido

thank you steve!