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Etherchannel with portchannel trunk.


Ether-channel or (link aggregation). Ether-channel is a technology that allows us to bundle multiple physical links into a single logical link. Ether-channel is used to aggregate bandwidth between multiple layer 2 / layer 3 interfaces



In other words Ether channel is a link aggregation technology on Cisco devices (primarily switches) which allows us to combine multiple physical links and make it into a single logical link. Multiple physical links into a single logical link. The advantage of Ether channels is that it provides high bandwidth.

Ether-channel increase bandwidth and provides redundancy by aggregating individual links between switches. Ether-channel load balances traffic over all the links in the bundle.

 We can use maximum 8 physical interface to configure bundle into a single logical link 



let see the configuration of Ether-channel with port-channel trunk.

Topology:



























  • configure the bundle of four links. make it one logical link.
  • configure pagp 
  • configure the portchannel interface as Trunk link.
SW-1(config)#interface range fastEthernet 0/1 - 4
SW-1(config-if-range)#channel-protocol pagp
SW-1(config-if-range)#channel-group 1 mode auto
SW-1(config-if-range)#exit

Creating a port-channel interface Port-channel 1


%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/2, changed state to down
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/2, changed state to up
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/3, changed state to down
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/3, changed state to up
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to down
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to up


SW-1(config-if-range)# interface range fastEthernet 0/5 - 8
SW-1(config-if-range)#channel-protocol pagp
SW-1(config-if-range)#channel-group 2 mode desirable
SW-1(config-if-range)#exit

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/6, changed state to down
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/6, changed state to up
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/7, changed state to down
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/7, changed state to up 
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/8, changed state to down 
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/8, changed state to up



SW-2(config)#interface range fastEthernet 0/1 - 4
SW-2(config-if-range)#channel-protocol pagp
SW-2(config-if-range)#channel-group 1 mode desirable
SW-2(config-if-range)#exit

%LINK-3-UPDOWN: Interface Port-channel1, changed state to down
 %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel1, changed state to down

%LINK-5-CHANGED: Interface Port-channel1, changed state to up
 %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel1, changed state to up


SW-2(config)#interface range fastEthernet 0/5 - 8
SW-2(config-if-range)#channel-protocol pagp
SW-2(config-if-range)#channel-group 3 mode auto
SW-2(config-if-range)#exit

Creating a port-channel interface Port-channel 3

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/5, changed state to down
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/5, changed state to up
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/6, changed state to down
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/6, changed state to up
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/7, changed state to down
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/7, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/8, changed state to down
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/8, changed state to up






SW-3(config)#interface range fastEthernet 0/1 - 4
SW-3(config-if-range)#channel-protocol pagp
SW-3(config-if-range)#channel-group 4 mode auto
SW-3(config-if-range)#exit

Creating a port-channel interface Port-channel 4

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/2, changed state to down
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/2, changed state to up
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/3, changed state to down 
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/3, changed state to up 
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to down 
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to up


SW-3(config)#interface range fastEthernet 0/5 - 8
SW-3(config-if-range)#channel-protocol pagp
SW-3(config-if-range)#channel-group 3 mode desirable
SW-3(config-if-range)#exit

Creating a port-channel interface Port-channel 3

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/5, changed state to down
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/5, changed state to up
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/6, changed state to down
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/6, changed state to up
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/7, changed state to down
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/7, changed state to up
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/8, changed state to down 
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/8, changed state to up

%LINK-5-CHANGED: Interface Port-channel3, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel3, changed state to up

 SW-4(config)#interface range fastEthernet 0/1 - 4
SW-4(config-if-range)#channel-protocol pagp
SW-4(config-if-range)#channel-group 4 mode desirable
SW-4(config-if-range)#exit

Creating a port-channel interface Port-channel 4

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/2, changed state to down
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/2, changed state to up
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/3, changed state to down
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/3, changed state to up
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to down
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed state to up

%LINK-5-CHANGED: Interface Port-channel4, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel4, changed state to up


SW-4(config)#interface range fastEthernet 0/5 - 8
SW-4(config-if-range)#channel-protocol pagp
SW-4(config-if-range)#channel-group 2 mode auto
SW-4(config-if-range)#exit

Creating a port-channel interface Port-channel 2

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/5, changed state to down
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/5, changed state to up
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/6, changed state to down
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/6, changed state to up
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/7, changed state to down
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/7, changed state to up
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/8, changed state to down
 %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/8, changed state to up


%LINK-5-CHANGED: Interface Port-channel2, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel2, changed state to up


SW-1#show etherchannel summary

Flags: D - down P - 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
u - unsuitable for bundling
w - waiting to be aggregated
d - default port


Number of channel-groups in use: 2
Number of aggregators: 2

Group Port-channel Protocol Ports
------+-------------+-----------+----------------------------------------------

1 Po1(SU) PAgP Fa0/1(P) Fa0/2(P) Fa0/3(P) Fa0/4(P)
2 Po2(SU) PAgP Fa0/5(P) Fa0/6(P) Fa0/7(P) Fa0/8(P)




SW-1#show spanning-tree

VLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 32769
Address 0001.9704.C446
Cost 7
Port 28(Port-channel2)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Address 00E0.F7BB.EAB0
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 20

Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Po1 Desg FWD 7 128.27 Shr
Po2 Root FWD 7 128.28 Shr




SW-2# show etherchannel summary
Flags: D - down P - 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
u - unsuitable for bundling
w - waiting to be aggregated
d - default port


Number of channel-groups in use: 2
Number of aggregators: 2

Group Port-channel Protocol Ports
------+-------------+-----------+----------------------------------------------

1 Po1(SU) PAgP Fa0/1(P) Fa0/2(P) Fa0/3(P) Fa0/4(P)
3 Po3(SU) PAgP Fa0/5(P) Fa0/6(P) Fa0/7(P) Fa0/8(P)

SW-2# show spanning-tree
VLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 32769
Address 0001.9704.C446
Cost 14
Port 28(Port-channel3)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Address 00D0.BC66.E3E5
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 20

Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Po3 Root FWD 7 128.28 Shr
Po1 Altn BLK 7 128.27 Shr

SW-2# show ip interface brief
Interface IP-Address OK? Method Status Protocol
Port-channel1 unassigned YES manual up up
Port-channel3 unassigned YES manual up up
FastEthernet0/1 unassigned YES manual up up
FastEthernet0/2 unassigned YES manual up up
FastEthernet0/3 unassigned YES manual up up
FastEthernet0/4 unassigned YES manual up up
FastEthernet0/5 unassigned YES manual up up
FastEthernet0/6 unassigned YES manual up up
FastEthernet0/7 unassigned YES manual up up
FastEthernet0/8 unassigned YES manual up up


 SW-3# show etherchannel summary
Flags: D - down P - 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
u - unsuitable for bundling
w - waiting to be aggregated
d - default port


Number of channel-groups in use: 2
Number of aggregators: 2

Group Port-channel Protocol Ports
------+-------------+-----------+----------------------------------------------

3 Po3(SU) PAgP Fa0/5(P) Fa0/6(P) Fa0/7(P) Fa0/8(P)
4 Po4(SU) PAgP Fa0/1(P) Fa0/2(P) Fa0/3(P) Fa0/4(P)

SW-3# show spanning-tree
VLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 32769
Address 0001.9704.C446
Cost 7
Port 27(Port-channel4)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Address 0003.E4B3.E4ED
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 20

Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Po3 Desg FWD 7 128.28 Shr
Po4 Root FWD 7 128.27 Shr

SW-3# show ip interface brief
Interface IP-Address OK? Method Status Protocol
Port-channel3 unassigned YES manual up up
Port-channel4 unassigned YES manual up up
FastEthernet0/1 unassigned YES manual up up
FastEthernet0/2 unassigned YES manual up up
FastEthernet0/3 unassigned YES manual up up
FastEthernet0/4 unassigned YES manual up up
FastEthernet0/5 unassigned YES manual up up
FastEthernet0/6 unassigned YES manual up up
FastEthernet0/7 unassigned YES manual up up
FastEthernet0/8 unassigned YES manual up up

SW-4# show etherchannel summary
Flags: D - down P - 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
u - unsuitable for bundling
w - waiting to be aggregated
d - default port


Number of channel-groups in use: 2
Number of aggregators: 2

Group Port-channel Protocol Ports
------+-------------+-----------+----------------------------------------------

2 Po2(SU) PAgP Fa0/5(P) Fa0/6(P) Fa0/7(P) Fa0/8(P)
4 Po4(SU) PAgP Fa0/1(P) Fa0/2(P) Fa0/3(P) Fa0/4(P)

SW-4# show spanning-tree
VLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 32769
Address 0001.9704.C446
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Address 0001.9704.C446
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 20

Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Po4 Desg FWD 7 128.27 Shr
Po2 Desg FWD 7 128.28 Shr

SW-4# show ip interface brief
Interface IP-Address OK? Method Status Protocol
Port-channel2 unassigned YES manual up up
Port-channel4 unassigned YES manual up up
FastEthernet0/1 unassigned YES manual up up
FastEthernet0/2 unassigned YES manual up up
FastEthernet0/3 unassigned YES manual up up
FastEthernet0/4 unassigned YES manual up up
FastEthernet0/5 unassigned YES manual up up
FastEthernet0/6 unassigned YES manual up up
FastEthernet0/7 unassigned YES manual up up
FastEthernet0/8 unassigned YES manual up up


SW-1(config)#interface port-channel 1
SW-1(config-if)#switchport mode trunk
 SW-1(config-if)#exit

SW-1(config)#interface port-channel 2
SW-1(config-if)#switchport mode trunk
 SW-1(config-if)#exit


SW-2(config)#interface port-channel 1
SW-2(config-if)#switchport mode trunk
SW-2(config-if)#exit


%SPANTREE-2-UNBLOCK_CONSIST_PORT: Unblocking Port-channel1 on VLAN0001. Port consistency restored.

%SPANTREE-2-UNBLOCK_CONSIST_PORT: Unblocking Port-channel1 on VLAN0001. Port consistency restored.

 SW-2(config)#interface port-channel 3
SW-2(config-if)#switchport mode trunk
 SW-2(config-if)#exit



SW-3(config)#interface port-channel 3
SW-3(config-if)#switchport mode trunk
 SW-3(config-if)#exit

SW-3(config)#interface port-channel 4
SW-3(config-if)#switchport mode trunk
 SW-3(config-if)#exit

SW-4(config)#interface port-channel 2
SW-4(config-if)#switchport mode trunk
 SW-4(config-if)#exit

SW-4(config)#interface port-channel 4
SW-4(config-if)#switchport mode trunk
 SW-4(config-if)#exit



SW-1#show interfaces trunk
Port Mode Encapsulation Status Native vlan
Po1 on 802.1q trunking 1
Po2 on 802.1q trunking 1

Port Vlans allowed on trunk
Po1 1-1005
Po2 1-1005

Port Vlans allowed and active in management domain
Po1 1
Po2 1

Port Vlans in spanning tree forwarding state and not pruned
Po1 1
Po2 1



SW-2#show interfaces trunk
Port Mode Encapsulation Status Native vlan
Po1 on 802.1q trunking 1
Po3 on 802.1q trunking 1

Port Vlans allowed on trunk
Po1 1-1005
Po3 1-1005

Port Vlans allowed and active in management domain
Po1 1
Po3 1

Port Vlans in spanning tree forwarding state and not pruned
Po1 none
Po3 1


SW-4#show interfaces trunk
Port Mode Encapsulation Status Native vlan
Po2 on 802.1q trunking 1
Po4 on 802.1q trunking 1

Port Vlans allowed on trunk
Po2 1-1005
Po4 1-1005

Port Vlans allowed and active in management domain
Po2 1
Po4 1

Port Vlans in spanning tree forwarding state and not pruned
Po2 1
Po4 1



SW-2#show spanning-tree
VLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 32769
Address 0001.9704.C446
Cost 14
Port 28(Port-channel3)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Address 00D0.BC66.E3E5
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 20

Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Po3 Root FWD 7 128.28 Shr
Po1 Altn BLK 7 128.27 Shr








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