Henry's Points

Although there is only 2 points for Trunking, it does need to carefully setup and verification. Two things need to keep in mind.

1. Don’t configure “interface Port-channel0″ in layer 2 channel-group. Cisco IOS takes care of it.

2. Make sure all swichports which participate in channel-group have the same configuration in physical layer, including speed, duplex, trunk mode and encapsulation.

HENRY_SW1#config t
HENRY_SW1(config)#inter range fa0/23, fa0/24
HENRY_SW1(config-if-range)#switchport trunk encapsulation dot1q
HENRY_SW1(config-if-range)#switchport trunk allowed vlan all
HENRY_SW1(config-if-range)#switchport mode trunk
HENRY_SW1(config-if-range)#channel-group 1 mode desirable
HENRY_SW1(config-if-range)#end

In case of loop when configure ethernet-channel, make sure that Port-channel participate spanning-tree, instead of those two ports.

HENRY_SW1#sh spanning-tree vlan 432

VLAN0432
Spanning tree enabled protocol ieee
Root ID Priority 32768
Address 0001.4327.7daf
Cost 145
Port 65 (Port-channel1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 33200 (priority 32768 sys-id-ext 432)
Address 000d.29ad.2880
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300

Interface Role Sts Cost Prio.Nbr Type
—————- —- — ——— ——– ——————————–
Fa0/13 Desg FWD 19 128.13 P2p
Fa0/14 Desg FWD 19 128.14 P2p
Fa0/15 Desg FWD 19 128.15 P2p
Fa0/16 Desg FWD 100 128.16 Shr
Po1 Root FWD 12 128.65 P2p

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