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An ECMP group is identified by the IP address of one of its members. By entering the IP address in the form
<prefix/prefix-length>, the utility predicts the packet's physical egress port based on the destination ECMP
group. To predict the an egress physical port when the egress objects are VLAN routing interfaces with Port-
channel or port interfaces as members of the VLANs, the utility requires the PVID to be configured on the
interfaces and the next hops to be fully installed in hardware.
If an ECMP group is comprised of VLAN routing interfaces and each VLAN has a Port-channel that contains
multiple ports, the utility requires the PVID to be configured on the Port-channels. In this configuration, the
utility first predicts which VLAN routing interface the packet is forwarded to and finds the Port-channel by
matching the VLAN ID of the VLAN routing interface to the PVID of the Port-channel. Then, it predicts which
physical port in the Port-channel the packet is forwarded to.
To make correct prediction when Port-channels are used as egress interfaces, the utility requires the
enhanced hashing mode to be set on the Port-channels.
Hash prediction is supported only for unicast packets on QNOS-based platforms.
3.3.3. Port-channel Interface Overview
The show interface port-channel brief command provides summary information about all Port-channels
available on the system. In the following output, Port-channel 3/1 has been configured as a dynamic Port-
channel with five member ports. No other Port-channels have been configured.
(QCT) #show interface port-channel brief
Channel Port-Channel Min Link State Trap Type Mbr Ports Active Ports
ID Name Flag
--------- ------------- --- ---------- -------- ------- --------- ------------
Disabled Dynamic 0/1,0/2,
3.3.4. Port-channel Interaction with Other Features
From a system perspective, a Port-channel is treated just as a physical port, with the same configuration
parameters for administrative enable/disable, spanning tree port priority, path cost as may be for any other
physical port.
3.3.4.1. VLAN
When members are added to a Port-channel, they are removed from all existing VLAN membership. When
members are removed from a Port-channel they are added back to the VLANs that they were previously
members of as per the configuration file. Note that a port’s VLAN membership can still be configured when
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