how to configure link aggregation on Cisco
Port channel interface:
Using
port channel interface group you can perform the same configuration at once,
you need to configure all your configuration on your channel group and then it will
replicate all your configuration on all the interface that you have added to that
channel group.
With
port aggregation you can utilize your interface with maximum throughput and
speed. Suppose you have two redundant interfaces between your switches, using
channel group you can utilize both interfaces at once. If you have two links of
1G each between two switches, you don’t get the 2G bandwidth/speed with channel
group but you can used both link as once. In absence of channel group spaining
tree protocol block one of link and use only one link/interface at a time. But
with port channel if you have two PC with switch as shown in figure, then PC1
may use interface 0/1 and PC2 may use other interface a, in this way you can
utilize both of your interfaces. EtherChannel provides
automatic recovery for the loss of a link by redistributing the load across the
remaining links. If a link fails, EtherChannel redirects traffic from the
failed link to the remaining links in the channel without intervention.
Commands:
interface range f1/0 - 1
channel group 1 mode on
For configuring different setting with port channel you can use following configurations:
interface port-channel 1
switchport speed 4000
no shut
When
you created the channel group then it is necessary that you should perform all your
configuration through that channel-group if you do some configuration on individual
interfaces then it will give you error of ”mismatch configuration”..
