490 | Interfaces
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Assign an IP address to a port channel
You can assign an IP address to a port channel and use port channels in Layer 3 routing protocols.
To assign an IP address, use the following command in the INTERFACE mode:
Delete or disable a port channel
To delete a port channel, you must be in the CONFIGURATION mode and use the no interface portchannel
channel-number command.
When you disable a port channel (using the
shutdown command) all interfaces within the port channel are
operationally down also.
Load balancing through port channels
FTOS uses hash algorithms for distributing traffic evenly over channel members in a port channel (LAG).
The hash algorithm distributes traffic among ECMP paths and LAG members. The distribution is based on
a flow, except for packet-based hashing. A flow is identified by the hash and is assigned to one link. In
packet-based hashing, a single flow can be distributed on the LAG and uses one link.
Packet based hashing is used to load balance traffic across a port-channel based on the IP Identifier field
within the packet. Load balancing uses source and destination packet information to get the greatest
advantage of resources by distributing traffic over multiple paths when transferring data to a destination.
FTOS allows you to modify the hashing algorithms used for flows and for fragments. The
load-balance and
hash-algorithm commands are available for modifying the distribution algorithms. Their syntax and
implementation are somewhat different between the E-Series and the C-Series and S-Series.
E-Series load-balancing
On the E-Series, the default load-balance criteria are a 5-tuple, as follows:
• IP source address
Command Syntax Command Mode Purpose
ip address ip-address mask [secondary] INTERFACE Configure an IP address and mask on the interface.
•
ip-address mask: enter an address in
dotted-decimal format (A.B.C.D) and the mask
must be in slash format (/24).
•
secondary: the IP address is the interface’s
backup IP address. You can configure up to eight
secondary IP addresses.
Note: Hash-based load-balancing on MPLS does not work when packet-based hashing (load-balance
ip-selection packet-based
) is enabled.
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