Connectivity Guide

Illegal packetse rcvd: 0
Local Port: MAC Address=74:e6:e2:f5:b5:80
System Identifier=32768,32768
Port Identifier=32768,32768
Operational key=1
LACP_Activity=passive
LACP_Timeout=Long Timeout(30s)
Synchronization=IN_SYNC
Collecting=true
Distributing=true
Partner information refresh timeout=Long Timeout(90s)
Actor Admin State=BCFHJKNO
Actor Oper State=BDEGIKNO
Neighbor: 276
MAC Address=00:00:00:00:00:00
System Identifier=,00:00:00:00:00:00
Port Identifier=0,14:18:77:7a:2d:00
Operational key=1
LACP_Activity=passive
LACP_Timeout=Long Timeout(30s)
Synchronization=IN_SYNC
Collecting=true
Distributing=true
Partner Admin State=BCEGIKNP
Partner Oper State=BDEGIKNO
LACP fallback
LACP fallback allows downstream devices, like Servers, connected to ports of a switch congured as LACP to establish a link when the
system is not able to nalize the LACP handshake.
For example, when servers boot in PXE mode, the server cannot exchange LACP PDUs and the switch does not enable the ports.
Whenever a PXE server reboots, both the port-channel and ports go down. While rebooting, the ports come up, but not the port-channel.
LACP fallback enables the port-channel to be up and keeps sending packets to the PXE server.
When you enable LACP fallback, the switch starts a timer. If the timer expires before LACP completes, then the switch selects one port of
the port group and makes it operational.
You can set the timer using the lacp fallback timeout timer-value command.
The LACP fallback feature adds a member port to LACP port-channel if it does not receive LACP PDUs from the peer for a particular
period of time.
The server uses the fallback port to nalize the PXE-boot process. When the server starts with the OS, the process completes the LACP
handshake and the fallback port re-unites the other members. The member port becomes active and sends packets to the PXE server.
When the switch starts receiving LACP PDU, OS10 ungroups the statically added member port from LACP port-channel and resumes with
normal LACP functionality..
When you enable LACP fallback, the port that comes up is selected based on the following:
• LACP port priority conguration allows deterministic port allocation. The port with the least priority is placed in the active state when a
port-channel is in LACP fallback mode.
• If all the ports in a port-channel have same port priority, the switch internally compares the interface names by base name, module
number, port number, and then selects the lowest one to be active. For example, Ethernet 1 is less than Ethernet 2 and hence Ethernet
1 becomes active.
• In a VLT network, if the interface name is the same on both the VLT peers, then the port in switch with lower system MAC address
becomes active.
Limitations
180
Layer 2