2.9.a Static
To configure static ether channels use the “mode on” option. Then configure the port range and the port channel interface with the “no switchport” option.
Switch>en
Switch#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)#^Z
%SYS-5-CONFIG_I: Configured from console by console
Switch#show spanning-tree
VLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 32769
Address 0001.C707.7E59
Cost 19
Port 1(FastEthernet0/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Address 0090.2B11.53A2
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 20
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Fa0/1 Root FWD 19 128.1 P2p
Fa0/2 Altn BLK 19 128.2 P2p
Fa0/3 Altn BLK 19 128.3 P2p
Fa0/4 Altn BLK 19 128.4 P2p
Switch(config)#int ran f0/1-4
Switch(config-if-range)#no switchport
Switch(config-if-range)#
%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
Switch(config-if-range)#channel-group 1 mode on
Switch(config-if-range)#
Creating a port-channel interface Port-channel 1
%LINK-5-CHANGED: Interface Port-channel1, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel1, changed state to up
Switch(config-if-range)#int port-channel 1
Switch(config-if)#ip address 10.0.0.1 255.255.255.0
Switch(config-if)#no shutdown
Switch(config-if)#^Z
2.9.b PAGP
To enable PAGP just specify the following option:
Switch(config-if-range)#channel-group 1 mode ? active Enable LACP unconditionally auto Enable PAgP only if a PAgP device is detected desirable Enable PAgP unconditionally on Enable Etherchannel only passive Enable LACP only if a LACP device is detected Switch(config-if-range)#channel-group 1 mode
2.9.c LACP
To enable LACP just specify the options:
Switch(config-if-range)#channel-group 1 mode ? active Enable LACP unconditionally auto Enable PAgP only if a PAgP device is detected desirable Enable PAgP unconditionally on Enable Etherchannel only passive Enable LACP only if a LACP device is detected Switch(config-if-range)#channel-group 1 mode
To troubleshoot and verify the configuration use the various “show” commands:
Switch#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: 1
Number of aggregators: 1
Group Port-channel Protocol Ports
------+-------------+-----------+----------------------------------------------
1 Po1(RU) - Fa0/1(P) Fa0/2(P) Fa0/3(P) Fa0/4(P)
Switch#show etherchannel ?
load-balance Load-balance/frame-distribution scheme among ports in
port-channel
port-channel Port-channel information
summary One-line summary per channel-group
Switch#show etherchannel port-channel
Channel-group listing:
----------------------
Group: 1
----------
Port-channels in the group:
---------------------------
Port-channel: Po1
------------
Age of the Port-channel = 00d:00h:01m:14s
Logical slot/port = 2/1 Number of ports = 4
GC = 0x00000000 HotStandBy port = null
Port state = Port-channel
Protocol = PAGP
Port Security = Disabled
Ports in the Port-channel:
Index Load Port EC state No of bits
------+------+------+------------------+-----------
0 00 Fa0/1 On 0
0 00 Fa0/2 On 0
0 00 Fa0/3 On 0
0 00 Fa0/4 On 0
Time since last port bundled: 00d:00h:01m:14s Fa0/4
The “show” commands should display enough information to troubleshoot the ether channel.
Note: on some switches the “no switchport” command is not available. I used a Layer 3 switch in Packet Tracer 7 to perform these labs. GNS3 does not support etherchannels.