How to verify MLAG link status?
After the MLAG neighbor relationship is correctly established and MLAG link configurations are loaded on the MLAG devices, use the following command to show the MLAG link to verify the MLAG link status.
run show mlag link {<link-id>| summary}
 For example,
admin@XorPlus# run show mlag link summary # of Links: 2 Link  Local LAG  Link Status  Local Status  Peer Status  Config Matched  Flood ----  ---------  -----------  ------------  -----------  --------------  ----- 1     ae1        IDLE         UP            UNKNOWN      No              No  2     ae2        IDLE         UP            UNKNOWN      No              No
See the command reference of run show mlag link for more details about the explanation of all the output.
In the display result, if Link Status is not FULL or Local Status is not UP, you can check whether LACP neighbor is established normally between the access devices and MLAG peer device by using the command run show lacp neighbor.
For example,
admin@Xorplus# run show lacp neighbor Aggregated interface: ae1 Port Number  Partner System ID   Partner Port Num  Port Priority  Oper Key  State -----------  -----------------------  ----------------  -------------  --------  ----- Aggregated interface: ae2 Port Number  Partner System ID  Partner Port Num  Port Priority  Oper Key  State -----------  -----------------------  ----------------  -------------  --------  ----- te-1/1/5     32768,3C:2C:99:89:89:01  2         32768          0x20      0x3D
In the displayed result, the State value should be 0x3D. If not, that indicates the LACP neighbor relationship is not successfully established. Then you can check whether a packet is sent to the CoPP or check the LACP configurations.
 For example,
admin@Xorplus# run show copp statistics lacp-class lacp-class Traffic statistics: forwarding-class state: active Input rate 0 bits/sec, 0 packets/sec Input Packets............................0 Input Octets.............................0 Drop rate 0 bits/sec, 0 packets/sec Drop Packets.............................0 Drop Octets..............................0
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