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:
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
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 FastEthernet0/8, 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
%LINK-5-CHANGED: 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 FastEthernet0/8, changed state to down
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 FastEthernet0/3, 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 FastEthernet0/8, 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-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
%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
%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
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)#interface port-channel
2
SW-1(config-if)#switchport mode
trunk
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-if)#switchport mode
trunk
SW-3(config)#interface port-channel
3
SW-3(config-if)#switchport mode
trunk
SW-3(config)#interface port-channel
4
SW-3(config-if)#switchport mode
trunk
SW-4(config)#interface port-channel
2
SW-4(config-if)#switchport mode
trunk
SW-4(config)#interface port-channel
4
SW-4(config-if)#switchport mode trunk
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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