Layer 3 etherchannel - load 0x00
folks
i have a quick question i'm hoping you can help with
i have a layer 3 etherchannel between 2 * 3750G stacks, both clusters use gi1/0/25 and gi/2/0/25 for the etherchannel and both are set as 'on'
i have traffic passing over the link but i get the following output from a show etherchannel detail
there are no bits being recorded and the load is 0x00
can someone help to explain this please?
thanks to anyone taking the time to reply
Group: 10
Group state = L3
Ports: 2 Maxports = 8
Port-channels: 1 Max Port-channels = 1
Protocol: -
Minimum Links: 0
Ports in the group:
Port: Gi1/0/25
Port state = Up Mstr In-Bndl
Channel group = 10 Mode = On Gcchange = -
Port-channel = Po10 GC = - Pseudo port-channel = Po10
Port index = 0 Load = 0x00 Protocol = -
Age of the port in the current state: 10d:01h:43m:57s
Port: Gi2/0/25
Port state = Up Mstr In-Bndl
Channel group = 10 Mode = On Gcchange = -
Port-channel = Po10 GC = - Pseudo port-channel = Po10
Port index = 0 Load = 0x00 Protocol = -
Age of the port in the current state: 10d:01h:43m:54s
Port-channels in the group:
Port-channel: Po10
Age of the Port-channel = 10d:01h:45m:24s
Logical slot/port = 10/10 Number of ports = 2
GC = 0x00000000 HotStandBy port = null
Passive port list = Gi1/0/25 Gi2/0/25
Port state = Port-channel L3-Ag Ag-Inuse
Protocol = -
Port security = Disabled
Ports in the Port-channel:
Index Load Port EC state No of bits
------+------+------+------------------+-----------
0 00 Gi1/0/25 On 0
0 00 Gi2/0/25 On 0
Time since last port bundled: 10d:01h:43m:54s Gi1/0/25
Hi,
I guess this is just a hardware limitation on the 3k platforms (ASICs).
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Glen is absolutely correct. on layer 2 switches EtherChannel load balancing can use either source-MAC or destination-MAC address forwarding.
With source-MAC address forwarding, when packets are forwarded to an EtherChannel, the packets are distributed across the ports in the channel based on the source-MAC address of the incoming packet. Therefore, to provide load balancing, packets from different hosts use different ports in the channel, but packets from the same host use the same port in the channel. With destination-MAC address forwarding, when packets are forwarded to an EtherChannel, the packets are distributed across the ports in the channel based on the destination host MAC address of the incoming packet. Therefore, packets to the same destination are forwarded over the same port, and packets to a different destination are sent on a different port in the channel.
So with every different source or destination mac it will use a diff link. If there is a session started on a aprticular link for a source to a destination it will keep on using the same link until the session termiantes or link goes down.
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Hi All,
I have one Catalyst 6509 connected to Catalyst 4500X-VSS using a Layer 2 Etherchannel.
So, 6509 are using src-dst-ip for Etherchannel Load Balance and 4500X are using src-dst-port.
Anyone knows if this will work fine or if I may have some problem?
Is recommended change that configuration or not?
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As you know Etherchannel is kind of load sharing among the links...It has its own way of load sharing/balancing the traffic if you leave it to default. (which means you might end up using the same link most often times if you dont change the default load balancing method). Hence we see people change the default method to the one which they want and get the nearest load sharing/balancing over the links utilization.
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Case B : 3 server connected on the switch behind a router on each site
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The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
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In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
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GigabitEthernet2/1 Enabled Up Inline-vlan-pair N/A
GigabitEthernet2/2 Disabled Down Unpaired N/A
GigabitEthernet2/3 Disabled Down Unpaired N/A
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Dec 8 15:11:41.363: FEC: pagp_switch_hotstandby: for agport Po1
Dec 8 15:11:41.363: FEC: pagp_switch_hotstandby: PAgP not enabled on agport Po1
Dec 8 15:11:41.367: FEC: pagp_switch_port_down: Gi3/23 Inform yes
Dec 8 15:11:41.367: FEC: pagp_switch_invoke_port_down: Gi3/23
Dec 8 15:11:41.367: FEC: fec_unbundle: Gi3/23
Dec 8 15:11:41.367: FEC: pagp_switch_change_vgc: gcchngreq == 0 for Gi3/23
Dec 8 15:11:41.367: FEC: pagp_switch_change_vgc: Gi3/23 gcchngreq = 0 gc = 0
Dec 8 15:11:41.367: %EC-5-UNBUNDLE: Interface GigabitEthernet3/23 left the port-channel Port-channel1
Dec 8 15:11:41.367: FEC: pagp_switch_delete_port_from_agport_internal: delete_port_from_agport: for port Gi3/23
Dec 8 15:11:41.367: FEC: delete port (Gi3/23) from agport (Po1)
Dec 8 15:11:41.367: FEC: pagp_switch_delete_port_from_agport_list: afb->nports-- = 1 [Gi3/23]
Dec 8 15:11:41.367: FEC: Un-Bndl msg NOT send to PM for port Gi3/23 from Po1
Dec 8 15:11:41.367: FEC: pagp_switch_reset_load_index: reading load-index for port Po1
Dec 8 15:11:45.363: FEC: pagp_switch_port_up: Gi3/23
Dec 8 15:11:45.363: FEC: pagp_switch_invoke_port_up: Gi3/23
Dec 8 15:11:45.363: FEC: pagp_switch_agc_compatable: comparing GC values of Gi3/23 Gi3/24 flag = 1 1
Dec 8 15:11:45.363: FEC: pagp_switch_port_attrib_diff: Gi3/23 Gi3/24 same
Dec 8 15:11:45.363: FEC: pagp_switch_agc_compatable: GC values are compatable
Dec 8 15:11:45.363: FEC: fec_bundle: Gi3/23
Dec 8 15:11:45.363: FEC: add port (Gi3/23) to agport (Po1)
Dec 8 15:11:45.363: FEC: pagp_switch_add_port_to_agport_list: afb->nports++ = 2 [Gi3/23]
Dec 8 15:11:45.363: %EC-5-BUNDLE: Interface GigabitEthernet3/23 joined port-channel Port-channel1
Dec 8 15:11:45.363: FEC: pagp_switch_add_port_to_agport_internal: msg to PM to bundle port Gi3/23 with Po1
Dec 8 15:11:45.363: FEC: pagp_switch_want_to_bundle: Bndl msg to PM for port Gi3/23 to Agport Po1
Dec 8 15:11:45.363: FEC: pagp_switch_hotstandby: for agport Po1
Dec 8 15:11:45.363: FEC: pagp_switch_hotstandby: PAgP not enabled on agport Po1
Dec 8 15:11:45.367: FEC: pagp_switch_reset_load_index: reading load-index for port Po1
Dec 8 15:12:08.370: FEC: pagp_switch_hotstandby: for agport Po1
Dec 8 15:12:08.370: FEC: pagp_switch_hotstandby: PAgP not enabled on agport Po1
Dec 8 15:12:08.374: FEC: pagp_switch_port_down: Gi3/24 Inform yes
Dec 8 15:12:08.374: FEC: pagp_switch_invoke_port_down: Gi3/24
Dec 8 15:12:08.374: FEC: fec_unbundle: Gi3/24
Dec 8 15:12:08.374: FEC: pagp_switch_change_vgc: gcchngreq == 0 for Gi3/24
Dec 8 15:12:08.374: FEC: pagp_switch_change_vgc: Gi3/24 gcchngreq = 0 gc = 0
Dec 8 15:12:08.374: %EC-5-UNBUNDLE: Interface GigabitEthernet3/24 left the port-channel Port-channel1
Dec 8 15:12:08.374: FEC: pagp_switch_delete_port_from_agport_internal: delete_port_from_agport: for port Gi3/24
Dec 8 15:12:08.374: FEC: delete port (Gi3/24) from agport (Po1)
Dec 8 15:12:08.374: FEC: pagp_switch_delete_port_from_agport_list: afb->nports-- = 1 [Gi3/24]
Dec 8 15:12:08.374: FEC: Un-Bndl msg NOT send to PM for port Gi3/24 from Po1
Dec 8 15:12:08.374: FEC: pagp_switch_reset_load_index: reading load-index for port Po1
Dec 8 15:12:13.362: FEC: pagp_switch_port_up: Gi3/24
Dec 8 15:12:13.362: FEC: pagp_switch_invoke_port_up: Gi3/24
Dec 8 15:12:13.362: FEC: pagp_switch_agc_compatable: comparing GC values of Gi3/24 Gi3/23 flag = 1 1
Dec 8 15:12:13.362: FEC: pagp_switch_port_attrib_diff: Gi3/24 Gi3/23 same
Dec 8 15:12:13.362: FEC: pagp_switch_agc_compatable: GC values are compatable
Dec 8 15:12:13.362: FEC: fec_bundle: Gi3/24
Dec 8 15:12:13.362: FEC: add port (Gi3/24) to agport (Po1)
Dec 8 15:12:13.362: FEC: pagp_switch_add_port_to_agport_list: afb->nports++ = 2 [Gi3/24]
Dec 8 15:12:13.362: %EC-5-BUNDLE: Interface GigabitEthernet3/24 joined port-channel Port-channel1
Dec 8 15:12:13.362: FEC: pagp_switch_add_port_to_agport_internal: msg to PM to bundle port Gi3/24 with Po1
Dec 8 15:12:13.362: FEC: pagp_switch_want_to_bundle: Bndl msg to PM for port Gi3/24 to Agport Po1
Dec 8 15:12:13.362: FEC: pagp_switch_hotstandby: for agport Po1
Dec 8 15:12:13.362: FEC: pagp_switch_hotstandby: PAgP not enabled on agport Po1
Dec 8 15:12:13.366: FEC: pagp_switch_reset_load_index: reading load-index for port Po1 -
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