Why both TE ports on C3560CX-12PD-S remain down,but they are in operat

[aashkar]

I have a swithc C3560CX-12PD-S running on 15.2(7)E4.

It has 2 TE ports that are in an etherchannel (mode on) and on SFP with fiber connection.

The ports show down\down (notconnected), yet they are in operation and pass traffic.

The upstream ports on another switch (C9300) show as up\up.

Is there any setting to make the port show UP\UP, or is this a bug?

What is preventing it from showing up\up?

Thank you!

[Flavio Miranda]

Surely it is a bug. The port must come up as soon as you plug another device. What you may see sometimes is protocol down but down/down is not possible unless we have a bug.

[aashkar]

Thank you, Flavio!

I will look for a stable firmware and see what happens.

[balaji.bandi]

post the configuration like below :

show run interface te x/x

show interface ten x/x

show EtherChannel x summary

what kind of SFP is this  ? 10G SR ? have you checked the Fibre ?

twice the Fibre lead and test. 

also, check giving fibre lead loop to see is the port comes up.

[aashkar]

Hi Balaji,

Here is what the config is and the status of the interface.

Please note that both upstream and downstream ports are 10G, but the SFPs used are for 1G port.

I also tried 10G SFP on both sides of the link and no difference.

The trunk is passing traffic, but this is what the situation is.

==================== Upstream switch C9300 ========================
interface TenGigabitEthernet1/1/4
description to-Te1/0/1
switchport trunk allowed vlan 2,5
switchport mode trunk
channel-group 4 mode on
end

XC-1#show int te 1/1/4
TenGigabitEthernet1/1/4 is up, line protocol is up (connected)
Hardware is Ten Gigabit Ethernet, address is 5488.de4e.12b8 (bia 5488.de4e.12b8)
Description: to-Te1/0/1
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not set
Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseSX SFP

==================== Downstream switch C3560CX-12PD-S ==============================
interface TenGigabitEthernet1/0/1
description GFX-PLANT29-XC-1_Te1/1/4
switchport trunk allowed vlan 2,5
switchport mode trunk
channel-group 4 mode on

XA-4_Guard#show int TenGigabitEthernet1/0/1
TenGigabitEthernet1/0/1 is down, line protocol is down (notconnect)
Hardware is Ten Gigabit Ethernet, address is 00b8.b325.100b (bia 00b8.b325.100b)
Description: to-Te1/1/4
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not set
Full-duplex, 1000Mb/s, link type is auto, media type is unkown

[balaji.bandi]

is this your own fiber or coming from a provider?

blizzard here, one side I can see up/up, are you sure you connected to the right port?

another side I see media unknown ? what SFP are you using? Can you remove SFP and re-insert and see the logs ?

Full-duplex, 1000Mb/s, link type is auto, media type is unknown

Sometimes you need to default the interface and setup speed 1000 and re-insert the SFP may work.

[aashkar]

I tried setting the BW manually to 1G, but same result.

What is also weird is ssh is enabled, but does not establishes ssh sessions, so I lost access to the switch.

This new switch has replaced another switch of similar model, but 8 ports instead of 12.

I adapted the same config to the new one and uploaded it to it.

Unfortunately the switch is not under support contract so I have to try resolving it myself.

[Leo Laohoo]

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@aashkar wrote:

Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseSX SFP

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That is not a 10 Gbps optic.  So this means  G1/0/1 (3560CX side) is up/up.

[balaji.bandi]

can you post show interace status ?