Module 6

Question 1

what is a port channel?

Answer 1

when an ethernchannel is configured, the resulting virtual interface is a port channel. The physical interfaces are bundled together into a port channel interface

Question 2

what are benefits of port channelling?

Answer 2

-more bandwidth without upgrading
-fault tolerance/redundancy
-if one physical link goes down, port channel stays up

Question 3

What are the guidelines of port channeling?

Answer 3

-switch must support it
-ports must be same speed and duplex
-max 8 ports in a port channel
-same vlans/mode

Question 4

etherchannels can be formed through negotiation using one of two protocols, what are those protocols?

Answer 4

Port aggregation protocol (PAgP) and Link aggregation control protocol (LACP)

Question 5

commands to configure link aggregation

Answer 5

s1(config)#int range fa0/1-3
(config-if-range)#channel-group 1 mode desirable
s1(config)#int Po1
s1(config-port)#switchport mode trunk
s1(config-port)#switchport trunk all vlan (vlan numbers)
s1(config-port)#no shutdown

s2(config)#int range fa0/1-3
s2(config-int-range)#channel-group 1 mode auto
s2(config)#int Po1
s2(config-port)#switchport mode trunk
s2(config-port)#switchport trunk all vlan (vlan numbers)
s2(config-port)#no shutdown

show ether summ (shows config for port channels)

Question 6

What does show ether summ display? what does “s” and “r” under port channel represent?

Answer 6

group port-channel protocol ports
S represents layer 2 connection, R represents layer 3 connection

Question 6

what negotiation protocols go with which?

Answer 6

desirable goes with auto or desirable, auto only goes with desirable, and active goes with either active or passive, and passive only goes with active