If your system has an Etherchannel fix, this guide will help you fix it.
Most problems with Etherchannels (link aggregation) can be attributed to misconfiguration. Remember that the configuration of all sports interfaces must be the same. With this in mind, Let’s take a look at some of the common problems with Etherchannels.
The idea is to enable FastEthernet 0/13 and 0/14 in Etherchannel, but that doesn’t work. Let’s take a look at the first problem …
Invalid Etherchannel Mode
Let’s take a look at our first problem: Etherchannel is not working properly. First, we check if all interfaces are functional:
SW1 # show Connects fa0 / 13 | Enable line protocolFastEthernet0 / 13 is a line extension, protocol is active (connected)
SW1 # show interfaces fa0 / 14 | Create Row ReportFastEthernet0 / 14 configured, standard protocol active (connected)
SW2 # show interfaces fa0 / 13 | Allow line protocolFastEthernet0 / 13 pending, protocol active (connected)
SW2 # show interfaces fa0 / 14 | Enable table protocolFastEthernet0 / 14 pending, protocol over (connected)
All interfaces are ready to use. Let’s see if you think we have a port-channel interface:
SW1 # show IP address int short | Enable portPort 1 channel not assigned YES not disabled
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SW2 # show Internet Protocol int short | Include nortPort 1 channel not assigned YES, not defined using
We can verify that the port channel screen was created, but it is inactive again. Let’s take a look at the details:
SW1 # show etherchannel | Start groupMulticast Port Link Protocol Ports------ + ------------- + ----------- + -------- --------- ---------------------------------1 Po1 (SD) LACP fa0 / 13 (i) Fa0 / 14 (I)
Here’s a cool command to test this Etherchannel. Use the show etherchannel summary cookie for your port’s channels. We see it. If sw1 was configured for LACP with SW2 for PAgP, it will never work. Let’s take a closer look:
SW1 # Show detailed information about Etherchannel 1Group status = L2Ports: 2 Maxports correspond to 16Port channels: 1 max. Number of port channels = 16Protocol: LACPMinimum links: 0Group ports:-------------------Connection: Fa0 / 13------------Port State = Up Sngl-port-Bndl Mstr Not-in-BndlChannel Group = Mode = Active Gcchange = -Port channel = zero GC = - chpseudo port al implies Po1Port index = three Load = 0x00 Protocol = LACPFlags: S - device is sending slow LACPDUs. F - device is sending fast LACPDUs. A - the device is in active mode. P - device in passive mode.Local information: LACP Admin Oper Port Port fieldPriority key port marks state key number stateFa0 / 13 SA independent 32768 0x1 0x1 0xF 0x7DPort age today: 0d: 00h: 11m: 59s Connection: Fa0 / 14------------ Port status is Up Sngl-port-Bndl Mstr Not-in-BndlChannel group is 1 Mode = Active Gcchange = -Port channel means zero GC = ~ pseudo port channel = Po1The port index is 0. Boot means 0x00 Protocol means LACP. Flags: S - device is sending slow LACPDUs. F - device is sending fast LACPDUs. A - the device is in the last active mode. P - device in passive mode. Local information: LACP prt Admin Oper Port PortPriority key port marks state key number stateFa0 / 14 SA independent 32768 0x1 0x1 0x10 0x7D Age of the product in its current state: 0d: 00h: 12m: 38sPort channels in a group: ---------------------------------------- Port channel: Po1 (main aggregator) ------------ Channel port age = 0d: 00h: 12m: 55sLogical slot / port corresponds to 2/1 number of ports is equal to 0HotStandBy port = zeroPort Express = Ag-Not-Inuse port channelProtocol = LACPPort security involves disabling
The best team is the etherchannel retail program. This gives you fantastic information, but I’m especially interested in knowing if LACP is configured in passive or active mode. Interfaces active in the structure will “actively” try to form a single air channel. Interfaces in passive mode will only perform LACP actions on demand. Let’s take a look at SW2:
SW2 # Show detailed information about Etherchannel 1Group status = L2Ports: 2 Maxports = 8Port channels: max. 7 port channels = 1Protocol: PAgPMinimum links: 0Group ports:-------------------Connection: Fa0 / 13------------Port Declaration = Up Sngl-port-Bndl Mstr Not-in-BndlChannel Group = 1 Mode = Desired-Sl Gcchange = 0Port Channel = Zero GC = 0x00010001 Pseudo Port Channel = Po1Port search engine spider = 0 Load = 0x00 Pr tol = PAgPFlags: S - The device is slowly sending hello. C Device is in a consistent state. A - The device is in automatic mode. - Device p remembers the exact port. - d PAgP failed.Timer: H - hello timer started. F - Output works by timer. S - Switching occurs by timer. I - the interface starts the timer.Local information: Partner Learning Group Hello PAgPPort LEDs State Timer Interval Counting Priority Method IfindexFa0 / 13 U4 / S4 H 30 s 0 128 All 10013 Age associated with the port in the current government: 0d: 00h: 15m: 25s Connection: Fa0 / 14------------ Port State = Up Sngl-port-Bndl Mstr Not-in-BndlChannel Group = Specific Mode = Desired Sl Gcchange = 0Port channel corresponds to zero GC = 0x00010001 Pseudo-port channel corresponds to Po1Port index = three Load = 0x00 Protocol = PAgP Flags: S - The device is slowly sending hello. C Device is in a consistent state. A - The device is in automatic mode. - The device learns on the physical port. - h PAgP failed.ThatTimer: H - hello timer started. Q - The output is considered to be the execution of the timer. S - Changeover is the cooking timer. I - the interface starts the timer. Local information: Partner Learning Group Hello PAgPPort LEDs State Timer Interval Counting Priority Method IfindexFa0 / 14 U4 / S4 H 30 s 0 128 All 10014 Port age in installed condition: 0d: 00h: 15m: 28s Port channels in a group: ---------------------------------------- Port channel: Po1------------ Age in the port channel = 0d: 00h: 15m: 51sLogical slot / port = 2/1 number of ports = 0GC corresponds to port 0x00000000 HotStandBy = zeroThe port state is the same as the Ag-Not-Inuse port channel.Protocol = PAgPPort monitoring = disabled
This is the result of the show etherchannel detail command for SW2. We can see that it has been configured for PAgP and the user interfaces c
Step 1. Find Access Locations. Examine the switches. When physical ports are uniquely assigned to an EtherChannel port, they behave like a port themselves.Step 2: Set the ports if you need trunk mode. A. Make sure all busy ports in the topology are installed on the trunk.
Common EtherChannel issues are as follows: The ports assigned to the EtherChannel are not part of the same VLAN or have not been configured as trunks. Ports with different natural VLANs cannot form EtherChannel. It looks like trunking has been reconfigured on some ports on which it forms EtherChannel, but not all.
Why isn’t the EtherChannel packet working? Switches use incompatible approaches to EtherChannel negotiation. Switch ports are not configured in trunk mode. The Trunk ID must be different for Switch A and Switch B.
