04-15-2009 07:58 AM - edited 03-06-2019 05:11 AM
Hi
please find my ether channel config below
interface Port-channel1
switchport trunk allowed vlan 11-14
switchport mode trunk
no ip address
----------------------------------------
interface FastEthernet0/2
switchport mode trunk
no ip address
channel-group 1 mode on
----------------------------------
interface FastEthernet0/9
switchport mode trunk
no ip address
channel-group 1 mode on
I am not able to see port channel up
out put is pasted below
---------------------
sh etherchannel s
Flags: D - down P - in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
u - unsuitable for bundling
U - in use f - failed to allocate aggregator
d - default port
Number of channel-groups in use: 1
Number of aggregators: 1
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SD) - Fa0/2(s) Fa0/9(s)
sh etherchannel brie
Channel-group listing:
-----------------------
Group: 1
----------
Group state = L2
Ports: 2 Maxports = 8
Port-channels: 1 Max Port-channels = 1
Protocol: -
A01-KG-DMZ-1#sh eht
A01-KG-DMZ-1#sh eht the
A01-KG-DMZ-1#sh etherchannel d
Channel-group listing:
-----------------------
Group: 1
----------
Group state = L2
Ports: 2 Maxports = 8
Port-channels: 1 Max Port-channels = 1
Protocol: -
Ports in the group:
-------------------
Port: Fa0/2
------------
Port state = Up Cnt-bndl Suspend Not-in-Bndl
Channel group = 1 Mode = On/FEC Gcchange = -
Port-channel = null GC = - Pseudo port-channel = Po1
Port index = 0 Load = 0x00 Protocol = -
Age of the port in the current state: 00d:05h:56m:10s
Probable reason: vlan mask is different
Port: Fa0/9
Port state = Up Cnt-bndl Suspend Not-in-Bndl
Channel group = 1 Mode = On/FEC Gcchange = -
Port-channel = null GC = - Pseudo port-channel = Po1
Port index = 0 Load = 0x00 Protocol = -
Age of the port in the current state: 00d:05h:56m:14s
Probable reason: vlan mask is different
Port-channels in the group:
----------------------
Port-channel: Po1
------------
Age of the Port-channel = 00d:03h:15m:04s
Logical slot/port = 1/0 Number of ports = 0
GC = 0x00000000 HotStandBy port = null
Port state = Port-channel Ag-Not-Inuse
Protocol = -
Could some one help to fix this isssue
regd
Adhitya
Solved! Go to Solution.
04-15-2009 09:06 AM
Adhitya,
That's what I'm talking about.
The VLANs trunked on the port-channel interface and the member interfaces should match. If there is a mismatch, the status of the interfaces will be down
Toshi
04-15-2009 10:45 AM
Toshi is right.
The physical interfaces as well as the logical port channel interface must be configured to pass the same vlans.
I made this point earlier.
When you dont specifically allow vlans on a trunk, you are allowing all of them by default. Remember, the logical channel must be an exact representation of the physical channels.
HTH
Victor
04-15-2009 08:18 AM
Hi, Adhitya:
For a port channel to come up successfully with all the associated links in the bundle, the configurations on each end have to be identical and hardware has to have the same capabailities.
That having been said, please make sure that:
1.) All ports are set to "switchport"
2.) All have the correct trunk encapsulation (dot1q, ISL).
3.) All are using the same trunking mode (dynamic desirable, on, etc) and that all ports are allowing the same vlans.
4.) Make sure all ports have the same speed and duplex settings (hardcode them preferably).
5.) Make sure all the ethernet cables are good and plugged into the correct ports.
You can always remove the etherchannel configuration and bring up each trunk one at aa time. When you verify all of the above, plus the fact that the ports can trunk successfully, then try adding them to the channel group.
PS When I say check all ports, I mean on both sides of the link -- all the ports involved.
HTH
Victor
04-15-2009 08:23 AM
Hi Victor,
thanks for the updates
Here are the my answers below
1.) All ports are set to "switchport" ( its L2 Switch 2950 )
2.) All have the correct trunk encapsulation (dot1q, ISL). ( encapsulatio is dot1q at bothe ends)
3.) All are using the same trunking mode (dynamic desirable, on, etc) and that all ports are allowing the same vlans. ( All are using same mode)
4.) Make sure all ports have the same speed and duplex settings (hardcode them preferably). ( All ports has same settings)
5.) Make sure all the ethernet cables are good and plugged into the correct ports.(Cables are good)
Please help
adhitya
04-15-2009 08:26 AM
adhitya,
Would you please post a "show interface x/x switchport" command on 4 links?
Toshi
04-15-2009 08:30 AM
Also, are you sure that the trunks come up without the port channel being configured?
04-15-2009 08:33 AM
Dear ALl
A01-KG-DMZ-1#show interfaces fa0/2 switchport
Name: Fa0/2
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: down (suspended member of bundle Po1)
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL
Protected: false
Voice VLAN: none (Inactive)
Appliance trust: none
A01-KG-DMZ-1#show interfaces fa0/9 switchport
Name: Fa0/9
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: down (suspended member of bundle Po1)
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL
Protected: false
Voice VLAN: none (Inactive)
Appliance trust: none
A01-KG-DMZ-1#
---------------
A01-KG-DMZ-2#show int
A01-KG-DMZ-2#show interfaces fa0/2 sw
A01-KG-DMZ-2#show interfaces fa0/2 switchport
Name: Fa0/2
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: down (suspended member of bundle Po1)
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL
Protected: false
Voice VLAN: none (Inactive)
Appliance trust: none
A01-KG-DMZ-2#show interfaces fa0/9 switchport
Name: Fa0/9
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: down (suspended member of bundle Po1)
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL
Protected: false
Voice VLAN: none (Inactive)
Appliance trust: none
A01-KG-DMZ-2#
04-15-2009 08:36 AM
Also, are you sure that the trunks come up without the port channel being configured?
04-15-2009 08:38 AM
Dear
Yes Trunk comes up with out port channel configured
Adhitya
04-15-2009 08:45 AM
Adhitya,
switchport trunk allowed vlan 11-14 Do you want to do this on both sides?
SW1:
interface Port-channel1
switchport trunk allowed vlan 11-14
switchport mode trunk
no ip address
----------------------------------------
interface FastEthernet0/2
switchport trunk allowed vlan 11-14
switchport mode trunk
no ip address
channel-group 1 mode on
----------------------------------
interface FastEthernet0/9
switchport trunk allowed vlan 11-14
switchport mode trunk
no ip address
channel-group 1 mode on
SW2:
interface Port-channel1
switchport trunk allowed vlan 11-14
switchport mode trunk
no ip address
----------------------------------------
interface FastEthernet0/2
switchport trunk allowed vlan 11-14
switchport mode trunk
no ip address
channel-group 1 mode on
----------------------------------
interface FastEthernet0/9
switchport trunk allowed vlan 11-14
switchport mode trunk
no ip address
channel-group 1 mode on
Please let us know how things work out. I always do "shut and no shut".
Toshi
04-15-2009 08:48 AM
Dear,
U mean to say that i need to add the below commads at interfae level
switchport trunk allowed vlan 11-14
04-15-2009 09:06 AM
Adhitya,
That's what I'm talking about.
The VLANs trunked on the port-channel interface and the member interfaces should match. If there is a mismatch, the status of the interfaces will be down
Toshi
04-15-2009 10:45 AM
Toshi is right.
The physical interfaces as well as the logical port channel interface must be configured to pass the same vlans.
I made this point earlier.
When you dont specifically allow vlans on a trunk, you are allowing all of them by default. Remember, the logical channel must be an exact representation of the physical channels.
HTH
Victor
04-17-2009 10:59 AM
@ Aditya,
As suggested by Toshi & Other...U need to configure command "switchport trunk allowed vlan 11-14" in each fastethernet / gigabit ethernet port bundled for a port channel.
Regards
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