Cross-stack Etherchannel in the 12.2.(40)SE IOS Release

Unanswered Question
Sep 14th, 2007

There is stack of two Catalyst 3750E-24T and of two Catalyst 3750E-12S. On the two Catalyst 3750E-24T configured Cross-stack Etherchannel (interface Port-channel1) is bundling interfaces GigabitEthernet 1/0/1 and GigabitEthernet 2/0/1 in the mode 'on'. This Port-channel connected to Port-channel on Catalyst 2960 (interface Port-channel1) which is bundling Interfaces GigabitEthernet 0/1 and GigabitEthernet 0/2 in the mode 'on' too. I have next result:

Switch3750E-24# show etherchannel 1 summary

Flags: D - down P - bundled in port-channel

I - stand-alone s - suspended

H - Hot-standby (LACP only)

R - Layer3 S - Layer2

U - in use f - failed to allocate aggregator

M - not in use, minimum links not met

u - unsuitable for bundling

w - waiting to be aggregated

d - default port

Number of channel-groups in use: 8

Number of aggregators: 8

Group Port-channel Protocol Ports


1 Po1(SU) - Gi1/0/1(P) Gi2/0/1(P)


Switch3750E-24# show etherchannel 1 port

Ports in the group:


Port: Gi1/0/1


Port state = Up Mstr In-Bndl

Channel group = 1 Mode = On Gcchange = -

Port-channel = Po1 GC = - Pseudo port-channel = Po1

Port index = 0 Load = 0x00 Protocol = -

Age of the port in the current state: 0d:02h:19m:51s


Switch3750E-24# show etherchannel 1 port-channel

Port-channels in the group:


Port-channel: Po1


Age of the Port-channel = 1d:23h:45m:33s

Logical slot/port = 10/1 Number of ports = 2

GC = 0x00000000 HotStandBy port = null

Port state = Port-channel Ag-Inuse

Protocol = -

Port security = Disabled

Ports in the Port-channel:

Index Load Port EC state No of bits


0 00 Gi1/0/1 On 0

Time since last port bundled: 0d:00h:06m:45s Gi2/0/1

If to use 'shutdown' command on the interface GigabitEthernet 1/0/1 then Port-channel don't have bundled port at all, but have status 'up' and is working, only is not displaying.

What is it? Is it bug or features of a IOS Release?

I have this problem too.
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wochanda Fri, 09/14/2007 - 15:23

The latter two commands you're doing look a little more in-depth into the switch asic programming. These commands often dont have cross-switch visibility, which is why you're only seeing information that pertains to the switch you're on.

For the other half of the information try this:

remote command 2 show etherchannel 1 port

remote command 2 show etherchannel 1 port-channel


remote command all show etherchannel 1 port

remote command all show etherchannel 1 port-channel


alexkotlov Mon, 09/17/2007 - 23:00

The using 'remote command' don't display interface GigabitEthernet2/0/1 in Port-channel too. It's only this IOS Release. In the previous Releases all commands worked correctly.


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