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Catalyst 4006 a few Queries

I have a Catalyst 4006 switch in a test environment which I have setup as per the below link. The setup works fine but I have a few queries.

a) When I execute the command show interfaces port-channel 10, it displayes it as Half-duplex, Unknown Speed, Media type unknown, Force link-up.
Is it a normal behaviour?

b) The command show port channel on the Supervisor, shows "3/1 Not directly connected to switch"
What does it mean?

Console> (enable) show module
Mod Slot Ports Module-Type               Model               Sub Status
--- ---- ----- ------------------------- ------------------- --- --------
1   1    2     1000BaseX Supervisor      WS-X4013            no  OK
2   2    6     1000BaseX Ethernet        WS-X4306            no  ok
3   3    34    Router Switch Card        WS-X4232-L3         no  ok
4   4    24    10/100/1000 Ethernet      WS-X4424-GB-RJ45    no  ok

Router#show interfaces port-channel 10
Port-channel10 is up, line protocol is up
  Hardware is GEChannel, address is 0007.84e4.7809 (bia 0000.0000.0000)
  MTU 1500 bytes, BW 2000000 Kbit, DLY 10 usec, rely 255/255, load 1/255
  Encapsulation ARPA, loopback not set, keepalive set (10 sec)
  Half-duplex, Unknown Speed, Media type unknown, Force link-up

Console> (enable) show port channel
Port  Status     Channel              Admin Ch
                 Mode                 Group Id
----- ---------- -------------------- ----- -----
3/1  connected  on                     123   833
3/2  connected  on                     123   833
----- ---------- -------------------- ----- -----

Port  Device-ID                       Port-ID                   Platform
----- ------------------------------- ------------------------- ----------------

3/1   Not directly connected to switch
3/2  Router                          GigabitEthernet4          cisco Cat4232L3
----- ------------------------------- ------------------------- ---------------

Everyone's tags (1)
Cisco Employee

Catalyst 4006 a few Queries


The first thing to check/rule out is the following  cosmetic issue documented under DDTS CSCdp04017.

When channeling in the ON mode, the ports show the neighbor information using CDP data.

The IOS sends out CDP packets on both channel interfaces and physical interfaces ...

One of the cat ports sees multiple CDP neighbors and reports 'not directly connected'.

You can try configuring port-channel mode to desirable on both sides of the links to see if it changes situation.

You can also try disabling cdp

Regarding the "Half-duplex, Unknown Speed, Media type unknown, Force link-up" it can be a trace of the problem explained above. Try workarounds suggested and then see if you still see same. If yes - check if other side is configured with half duplex and negotiation is correct.


- what is connected to the other side of Po?

on IOS:

show int po10

show int gi3/1

show int gi3/1

sh run int po10

sh run int gi3/1

sh run int gi3/2

on catos:

show port 3/1

show port 3/2

show port-channel

sh conf mod 3



Catalyst 4006 a few Queries

Thanks Nikolay for the workaround.

Disabling CDP resolved one issue. However the following command still shows the channel as half duplex with unknown speed.

Router#show interfaces port-channel 10

But on IOS the command show int gi3 and show int gi3 lists it as 1gbps with full duplex.

Similarly on cat os 3/1 and 3/2 is listed as 1gbps with full duplex.


Catalyst 4006 a few Queries

Where can I find the cosmetic issue documented under DDTS CSCdp04017 ?

Cisco Employee

Catalyst 4006 a few Queries


You can read it here:

Kind Regards,

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Kind Regards, Ivan Shirshin **Please grade this post if you find it useful.
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