ACE switching-mode command

Hy guys.
Can anybody explain what exactly the "switching-mode" command does?
Thanks!

Hi David,
First confirm that the gateway is set correctly on the servers. It must be the MSFC IP. Secondly, take captures to see where whether ACE is getting the response and forwarding it to MSFC or not.
If it is an ACE module then you will have to take capture the switch backplane Tengig interface of the switch. If it is an ACE appliance then take sniffer capture on the switch interfaces connected to the Appliance. Make sure that both server and client vlan traffic is captured in the same file so complete flow can be viewed.
Here is the procedure to take sniffer on tengig interface:
The ACE's tengig port is always <ace-slot>/1.
Let's say your ACE is in slot 3. It's backplane interface would then be
Te3/1. You then use the monitor command to configure the source (SPAN)
port to this interface.
monitor session 1 source interface TenGigabitEthernet 3/1 both
monitor session 1 destination interface GigabitEthernet x/y
monitor session 1 filter vlan 510 - 511 , 640 , 652 - 656 <----
Line is optional and will capture only specified VLANs
Configure the destination (SPAN) port as a trunk port so that the VLAN
IDs will be preserved:
interface Gix/y
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate
Be sure that the network analyzer connected to the destination port can
monitor VLAN tags (a trunked port). Here is a link on how to configure
NICs using some of the Intel chipsets to pass the VLAN tagging info:
http://support.intel.com/support/network/sb/CS-005897.htm
Wireshark has posted this info, as well as how to configure NICs with
the Broadcom chipset:
http://wiki.wireshark.org/CaptureSetup/VLAN#head-e0dc0f9fe0cc6b1b1866d78
da7b97ead34dca1d8
With IOS Release 12.2(18)SXD and later releases, when a destination port
is a trunk, you can use the list of VLANs allowed on the trunk to
filter the traffic transmitted from the destination port. This should
not be necessary if you configured the optional 'filter' line in the
monitor session configuration.
interface Gix/y
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 102, 103
switchport mode trunk
switchport nonegotiate
Thanks,
Hasham

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I mean, as part of the cut-through processing, the VLAN tag needs to be analyzed. If the ingress port is configured to support VLAN tags, then the cut-through needs to wait to see that portion of the frame. Likewise, if the egress port is VLAN tagged, the frame will need to held until the frame's VLAN tag can be constructed.
So, yes, cut-through could work with VLAN tags, it will just add a bit of latency. It's up to the device vendor to determine how, and under what conditions, cut-though will work.
Some cut-through swtiches support "fragment-fee", which means that look at more of the header. Some (at least years ago), would use fragment-free dynamically (based on loading). So, again, it's really up to the device vendor. (BTW, "basic" cut-though assumes the whole frame will be received, but that's not always a valid assumption.)

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