SWITCH 300-115 1.5 Configure and verify EtherChannels

1.5.a LACP, PAgP, manual

screenshot

For CCNP Switch it is advisable to get some switches. Two should be enough to get you through. 3560 minimum, (and so cheap on ebay) which will support everything you need.

Make redundant links between your switches as in the diagram.

set up etherchannel between the 4 switches. I chose on mode to begin; config below:

etherch_02

the mode is “on”, f0/11 and 12 are bundled layer 2 and up. to prove that, if you mismatch link configurations between ports, see below suspended port f0/11:

etherch_study_01

adding storm-control suspended f0/11. So make them the same on both sides and be especially careful in production if you are not using negotiation or etherchannel guard.

Make a PAGP etherchannel between a different set of links:

sw2(config)#int range f0/11 – 12
sw2(config-if-range)#no channel-g 1 mode on
sw2(config-if-range)#channel-g 1 mode desir

etherch_03

make another set of links an LACP channel (note the wait below):

sw1(config)#int rang f0/7 – 8
sw1(config-if-range)#channel-g 2 mode act
sw1(config-if-range)#do sh etherchann summ | b G
Group  Port-channel  Protocol    Ports
——+————-+———–+———————————————–
1      Po1(SU)         PAgP      Fa0/11(P)   Fa0/12(P)
2      Po2(SU)         LACP      Fa0/7(w)    Fa0/8(w)
3      Po3(SU)          –             Fa0/9(P)    Fa0/10(P)

sw1(config-if-range)#do sh ether summ
Flags:  D – down        P – bundled in port-channel
I – stand-alone s – suspended
H – Hot-standby (LACP only)
R – Layer3      S – Layer2
U – in use      f – failed to allocate aggregator

M – not in use, minimum links not met
u – unsuitable for bundling
w – waiting to be aggregated
d – default port

Number of channel-groups in use: 3
Number of aggregators:           3

Group  Port-channel  Protocol    Ports
——+————-+———–+———————————————–
1      Po1(SU)         PAgP      Fa0/11(P)   Fa0/12(P)
2      Po2(SU)         LACP      Fa0/7(P)    Fa0/8(P)
3      Po3(SU)          –             Fa0/9(P)    Fa0/10(P)

i made them both desirable, and active on both ends, but you could choose desirable/auto active/passive between the two pair, just not auto/auto nor passive/passive…

but you knew that…

try the command show etherchannel port…