Hi,
We have a QinQ link and each end of the link goes to 2 ports setup in a
LACP port channel. We have noticed that the traffic leaving the QinQ is
only going out of one port and not balancing between the two ports.
I have tried changing the balancing algorithm used however doesn't seem
to be making difference.
The Setup is as follows
End user device A -> <2x1G port channel> -> Cisco 4948 -> Rest of
network -> Cisco 4948 -> <2x1G port channel> -> End user device B
The port channel facing the end user device are setup as a dot1Q tunnel
-------
interface GigabitEthernet1/1
switchport access vlan 1337
switchport mode dot1q-tunnel
mtu 9198
logging event link-status
no cdp enable
channel-protocol lacp
channel-group 1 mode passive
interface GigabitEthernet1/2
switchport access vlan 1337
switchport mode dot1q-tunnel
mtu 9198
logging event link-status
no cdp enable
channel-protocol lacp
channel-group 1 mode passive
interface Port-channel1
switchport
switchport access vlan 1337
switchport mode dot1q-tunnel
mtu 9198
logging event link-status
l2protocol-tunnel cdp
l2protocol-tunnel stp
l2protocol-tunnel vtp
#show etherchannel load-balance
EtherChannel Load-Balancing Configuration:
src-dst-port
EtherChannel Load-Balancing Addresses Used Per-Protocol:
Non-IP: Source XOR Destination MAC address
IPv4: Source XOR Destination TCP/UDP (layer-4) port number
IPv6: Source XOR Destination IP address
#show etherchannel 1 detail
Channel-group listing:
----------------------
Group: 1
----------
Group state = L2
Ports: 2 Maxports = 8
Port-channels: 1 Max Port-channels = 1
Protocol: LACP
Ports in the group:
-------------------
Port: Gi1/1
------------
Port state = Up Mstr Assoc In-Bndl
Channel group = 1 Mode = Passive Gcchange = -
Port-channel = Po1 GC = - Pseudo port-channel =
Po1
Port index = 0 Load = 0x00 Protocol = LACP
Flags: S - Device is sending Slow LACPDUs F - Device is sending fast
LACPDUs.
A - Device is in active mode. P - Device is in passive
mode.
Local information:
LACP port Admin Oper Port
Port
Port Flags State Priority Key Key Number
State
Gi1/1 SP bndl 32768 0x40 0x40 0x1C
0x3C
Partner's information:
Port Flags State Priority AdminKey DevID Age OperKey
PortNum PortState
Gi1/1 FA bndl 1 0x0 xxxx.xxxx.xxxx 1s 0x4E21
0x10 0x3F
Age of the port in the current state: 5d:09h:57m:58s
Port: Gi1/2
------------
Port state = Up Mstr Assoc In-Bndl
Channel group = 1 Mode = Passive Gcchange = -
Port-channel = Po1 GC = - Pseudo port-channel =
Po1
Port index = 1 Load = 0x00 Protocol = LACP
Flags: S - Device is sending Slow LACPDUs F - Device is sending fast
LACPDUs.
A - Device is in active mode. P - Device is in passive
mode.
Local information:
LACP port Admin Oper Port
Port
Port Flags State Priority Key Key Number
State
Gi1/2 SP bndl 32768 0x40 0x40 0x1D
0x3C
Partner's information:
Port Flags State Priority AdminKey DevID Age OperKey
PortNum PortState
Gi1/2 FA bndl 1 0x0 xxxx.xxxx.xxxx 28s 0x4E21
0x27 0x3F
Age of the port in the current state: 5d:09h:54m:52s
Port-channels in the group:
---------------------------
Port-channel: Po1 (Primary Aggregator)
------------
Age of the Port-channel = 62d:23h:05m:40s
Logical slot/port = 11/1 Number of ports = 2
Port state = Port-channel Ag-Inuse
Protocol = LACP
Port security = Disabled
Ports in the Port-channel:
Index Load Port EC state No of bits
------+------+------+------------------+-----------
0 00 Gi1/1 Passive 0
1 00 Gi1/2 Passive 0
Time since last port bundled: 5d:09h:54m:54s Gi1/2
Time since last port Un-bundled: 5d:13h:43m:08s Gi1/2
-------
It feels like it the switches are not looking at the right headers
within the packet and not matching on the Layer 3/4 headers, possibly
due to the packets being double tagged assuming it does the XOR before
the outer tag is removed?
Any ideas on what might be going on here?
Regards
David
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