Configuring The Pagp Learn Method And Priority - Cisco WS-C3550-12G Software Configuration Manual
Multilayer switch
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Configuring EtherChannel
Beginning in privileged EXEC mode, follow these steps to configure EtherChannel load balancing:
Command
Step 1
configure terminal
Step 2
port-channel load-balance {dst-mac | src-mac} Configure an EtherChannel load-balancing method.
Step 3
end
Step 4
show etherchannel load-balance
Step 5
copy running-config startup-config
To return EtherChannel load balancing to the default configuration, use the no port-channel
load-balance global configuration command.
Configuring the PAgP Learn Method and Priority
Network devices are classified as PAgP physical learners or aggregate-port learners. A device is a
physical learner if it learns addresses by physical ports and directs transmissions based on that
knowledge. A device is an aggregate-port learner if it learns addresses by aggregate ports.
For compatibility with Catalyst 1900 series switches, configure the PAgP learning method on the
Catalyst 3550 switches to learn source-MAC addresses on the physical port. The switch then sends
packets to the Catalyst 1900 switch using the same interface in the EtherChannel from which it learned
the source address.
Catalyst 3550 Multilayer Switch Software Configuration Guide
21-14
Purpose
Enter global configuration mode.
The default is src-mac.
Select one of these keywords to determine the load-distribution
method:
•
dst-mac—Load distribution is based on the destination-host
MAC address of the incoming packet. Packets to the same
destination are sent on the same port, but packets to different
destinations are sent on different ports in the channel.
•
src-mac—Load distribution is based on the source-MAC
address of the incoming packet. Packets from different hosts
use different ports in the channel, but packets from the same
host use the same port in the channel.
When src-mac is used, load distribution based on the source
and destination IP address is also enabled. For all IP traffic
being routed, the switch chooses a port for transmission
based on the source and destination IP address. Packets
between two IP hosts always use the same port for packet
transmission, but packets between any other pair of hosts
might use a different transmission port.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Chapter 21
Configuring EtherChannel
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