C2960S switches reset SFP+ ports hourly

We have several C2960S switches that seem to reset their uplink SFP+ ports at the same time each hour. It looks like it's only a brief reset but any Cisco phones we have attached to these switches will lose their connectivity to our Subscriber and reset. Has anyone else seen this? We are running iOS 15.2(2a)E1 due to a different error we were having (%ENTROPY errors), and Cisco TAC recommended we upgrade to the latest code. I included a "sho log" to demonstrate what I'm talking about. The interface in question is Gi1/0/49 which has a GLC-T in it that uplinks to our Data Center switches.

I see you have 2960s, but there is know bug for the 2960-X series regarding GLC-T and other SFPs.
So, this maybe effecting your switch as well but not sure.
here is the bug id and link:
CSCur56395
https://tools.cisco.com/bugsearch/bug/CSCur56395/?reffering_site=dumpcr
HTH

Similar Messages

SFP port problm

Hi all.I am trying to connect cisco 2960 series(WS-C2960-48PST-L) switch to planet switch via sfp port,we are using cisco module in cisco side and planet module in the planet switch but the sfp port did not working..please help.....
Posted by WebUser Muhammed Rashid from Cisco Support Community App

Is the Cisco side down/down? Does the Cisco recognize the module?
show interface x/x and show interface transceiver for the Cisco side would be good.
Daniel Dib
CCIE #37149

2960x - stack cables connected while switches power on. SFP ports - status unknown

Connected 2960x uplink using SFP ports both stacks and all 4 ports worked good.
Remote tech connected last stack cable between first and last switch, in 2 different 2960x stacks of switches, while switches were powered on. A longer stack cable was needed. 3 of 4 SFP ports did stopped communicating.
One stack SFP stayed up in switch 2, not master. Completed reload - other SPF connected in switch 4/0/52
Second stack no connection on either SFP, remote tech power cycled switches.
After power cycle one SFP worked in Master 1/0/52, other switches SFP ports show "unknown" when inserting SFP.
Configured port 48 on stack with issue and connected second uplink just fine.
Has anyone experienced this with the SFP's?
- GLC-T P/N 30-1410-03
Looking for documentation on reccommending procedure for connecting stack cables while switches should be powered off or not.
Thanks,

Opened Cisco TAC case. the following bug was found.
the two different HBRN's below require 2 different IOS and they cannot be in same stack.
https://tools.cisco.com/bugsearch/bug/CSCur56395
switch#sh ver | s Hardware Board
Hardware Board Revision Number : 0x05
switch#remote command 2 sh ver | s Hardware Board
Switch : 2 :------------ Hardware Board Revision Number : 0x05
switch#remote command 3 sh ver | s Hardware Board
Switch : 3 : ------------ Hardware Board Revision Number : 0x12
switch#remote command 4 sh ver | s Hardware Board
Switch : 4 :------------Hardware Board Revision Number : 0x12
From Cisco.
Developers have recommended to upgrade the IOS version of switches with a Hardware Board revision Number below 0x10 to the release 15.0(2.0).EX5ES. this is the one attached to this email and should be applied to switch 1 and 2.
For switches with a Hardware Board revision Number above 0x10 to the release 152-2.4.E1ES, which I will send you right away. This should be done on switch 3 and 4.
Now, If you load the engineering special, you will need to do a full power-cycle (physically unplug the power and plug it back in for every single switch). A simple ‘reload’ will not resolve this.
The same must be done on Switch-0. For this stack you will only need to load the image attached to this email since all the Hardware Board revision Numbers are lower than 0x10.
done.

SG500X-24 Switch SFP ports

Hi,
i have a question about the max number of sfp ports available on the SG500X-24 Switch. I need to configure a Stack with 2 SG500X-24 units: can i use 5G ports and have 4 SFP as network ports. In the quick start guide i read that i can use i couple for stack and only 1 couple of ports for standard network, while around Internet i read different. So my question is: can i use all the 6 SFP ports of the switches? 2 5G ports for stacking and 4 SFP ports for normal network operation ?
Thank you,
Roberto

Hi Rob, the switch has 4 10 gig ports. There is also 2 5 gig ports. The 5 gig ports are combo ports meaning you can use either xg3 and xg4 OR the 5g ports.
-Tom
Please mark answered for helpful posts

SFP Ports on 3560 Switches

Hi All,
I have 3560G-24Ts-s, it contains 4 SFP based Ports, I would like to know:-
1- What does (SFP) stand for?
2- what does SFP based ports provide?
thank you,

HI
SFP stand for small form factor pluggables.
SFP ports are fiber interfaces u can compare them to GBICS.We can use them for connectivity between the switches as they are gigabit interfaces.
Thanks
Mahmood

Uplink ports and actual sfp port in switches ( please help )

Dear all,
I am reading around to see the differences between uplink ports and normal ethernet ports. It seems to be uplink port just reverse the rx,tx pins and remove the needs of using a crossover cable.
I have done a simple representation of using the below (normal ethernet ports)
PC
SWITCH
ROUTER
RX
straight
TX
straight
RX
RX
straight
TX
straight
RX
TX
straight
RX
straight
TX
TX
straight
RX
straight
TX
I assumed that the SWITCH ethernet port pins are naturally arranged as opposite from the PC so that a straight cable can be used and the same applies to a router port.
Q1) Hence from PC to Router ethernet port, I will need a cross cable, am I right ?
============================================================
Then I chance upon this website http://duxcw.com/faq/network/uplink.htm which states "A PC can be connected to an uplink port with a crossover cable"
As per my assumption above, a router has normal ethernet ports and uplink ports (for connecting to the wan/modem), since the normal ethernet ports of a router are in the order of (RX,RX,TX,TX) as shown above, I assumed the uplink port is (TX,TX,RX,RX).
PC
ROUTER normal ethernet port
PC
ROUTER uplink port
RX
cross
RX
RX
straight
TX
RX
cross
RX
RX
straight
TX
TX
cross
TX
TX
straight
RX
TX
cross
TX
TX
straight
RX
Q2) So how can the PC connect to the Router's Uplink port using a crossover cable ? Shouldn't it be using straight cable instead if it is trying to connect to a router's uplink port ?
============================================================
Q3) Where connecting switches (switch 1 to swtich2) using uplink port, can I say that a straight cable will be connected to switch 1 uplink port on 1 end, and a normal ethernet port in switch 2 on another end ?
SWITCH#1 ethernet port
SWITCH#1 Uplink port
SWITCH#2 ethernet port
TX
RX
straight
TX
TX
RX
straight
TX
RX
TX
straight
RX
RX
TX
straight
RX
============================================================
Q4) What is the purpose of an SFP port in a switch ? is it use as an uplink port ? Where does it actually uplink/connect to ?
Q5) If i connect a switch Uplink port to another switch Uplink port, does it means that I have to use a crossover cable ? does SFP fiber come with "crossover" type too ?
============================================================
Q6) If an uplink port in a switch is use to connect to a router (can we?), do i need to use a crossover cable then ? since a normal switch ethernet port will use a straight cable to connect to a router port ? as shown below
SWITCH
ROUTER
SWITCH UPLINK
ROUTER
TX
straight
RX
RX
cross
RX
TX
straight
RX
RX
cross
RX
RX
straight
TX
TX
cross
TX
RX
straight
TX
TX
cross
TX
============================================================
Q7) Last but not least, if a design connect two switches using SFP uplink ports on both side, what would be the main purpose ? to increase the amount of ports ? Why not stack them then ?
Sorry for the lengthy post, will really appreciate if some gurus can shed some light on the above.
Thanks a million.
Regards,
Noob

Hi Noob,
On some kit like netgear hubs etc, you may find a little button or
slider switch which may be labelled MDI or MDI(X) this allows a
straight cable to be used between 2 Hubs or switches (Both DCEs).
Some Cisco switches/routers will allow you to do the same but in software
interface fastethernet 1/0/1
mdix auto
====================================
DTE devices like say your laptop PC NIC card has an MDI (Medium Dependant Interface).
Physically this wires out as ( For 10/100M):-
RJ45 PIN
1 -- TRANSMIT +ve
2 -- TRANSMIT -ve
3 -- RECEIVE +ve
6 -- RECEIVE -ve
DCE devices like hubs & swiches have MDI-X (Medium Dependant Interface - Crossedover).
Physically this wires out as ( For 10/100M):-
RJ45 PIN
1 -- RECEIVE +ve
2 -- RECEIVE -ve
3 -- TRANSMIT +ve
6 -- TRANSMIT -ve
So lets connect the device together with a STRAIGHT cable ( Function DTE to DCE)
PC/NIC = DTE = MDI                                SWITCH = DCE = MDI(X)
RJ45 PIN                                           RJ45 PIN
1 -- TRANSMIT +ve -------------------------------- 1 -- RECEIVE +ve
2 -- TRANSMIT -ve -------------------------------- 2 -- RECEIVE -ve
3 -- RECEIVE +ve --------------------------------- 3 -- TRANSMIT +ve
6 -- RECEIVE -ve --------------------------------- 6 -- TRANSMIT -ve
So we transmit from the DTE and receive on the DCE and vice versa (BINGO).
Remember Routers are regarded as DTEs
=================================
So lets connect 2 switches together with a CROSSOVER cable ( Function DCE to DCE)
UPLINK to UPLINK
SWITCH = DCE = MDI(X)                           SWITCH = DCE = MDI(X)
RJ45 PIN                                           RJ45 PIN
1 -- RECEIVE +ve -------------------------------- 3 -- TRANSMIT +ve
2 -- RECEIVE -ve --------------------------------- 6 -- TRANSMIT -ve
3 -- TRANSMIT +ve ------------------------------ 1 -- RECEIVE +ve
6 -- TRANSMIT -ve ------------------------------- 2 -- RECEIVE -ve
So we transmit from the DCE and receive on the DCE and vice versa (BINGO).
Regards
Alex

3548-XL-EN to switch with small form-factor pluggable (SFP) ports

Is it possible to connect my 3548 with a WS-G5484 directly to a 3560-24TS
with small form-factor pluggable (SFP) port?
thanks

Yes.. You will need a LC-SC connector. The part number for a 10-Meter Fiber Multimode SX LC-to-SC Connectors is "CSS5-CABSX-LCSC"

Upgradation of Switch SFP ports

Can we use XFP transcivers in Cisco WS-C3560G-48TS-S SFP port.

No
You can check that on www.cisco.com/go/configmaker
Regards
JD

Linking C2960s switches through Fiber optic patch panel.

Hi, I have C2960s switches. I have to interconnect the switches through Fiber optic patch panel. Let me know which is the type of the connector used in the SFP ports.

There are a types of connectors that you need to consider:
1. Switch to Fiber Patch Panel
2. Fiber patch panel to Fiber patch panel
However, typically SFPs have LC type connection. With regards to Fiber Patch panel, typically (in my experience) SC type connection is used.
I have attached screenshots of the connectors as well :)
Don't forget to rate or mark as correct! :)

SFP Port Disabled?

Hi I have a link between:
Switch A (3750G PS48)
and
Switch B (2 stacked 3750G TS24)
These are connected via fiber through their SFP ports using the SFP GLC-SX-MM tranceivers.
On Switch A, one of the SFP ports (poort 50) indicates that it is disabled from the Cisco Device Manager web page and it is showing an amber light.
On switch B, both SFP ports have green LEDs.
Any ideas on how to enable this port?

Not able to do a show interface "port" for ports 49 and 50 (dont know why). Is it because these are SFP ports?
Anyway, I did a show interface and shown below is the output for 49 and 50. 49 is showing greed, while 50 is amber:
GigabitEthernet1/0/49 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 0016.c7f7.a831 (bia 0016.c7f7.a831)
MTU 1500 bytes, BW 1000000 Kbit, 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
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:01, output 00:00:17, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 1000 bits/sec, 1 packets/sec
5 minute output rate 1000 bits/sec, 1 packets/sec
83696 packets input, 15488039 bytes, 0 no buffer
Received 46220 broadcasts (0 multicast)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 30403 multicast, 0 pause input
0 input packets with dribble condition detected
162927 packets output, 71484021 bytes, 0 underruns
0 output errors, 0 collisions, 5 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
0 output buffer failures, 0 output buffers swapped out
GigabitEthernet1/0/50 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 0016.c7f7.a832 (bia 0016.c7f7.a832)
MTU 1500 bytes, BW 1000000 Kbit, 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
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:23, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
118803 packets input, 9003642 bytes, 0 no buffer
Received 118281 broadcasts (0 multicast)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 113959 multicast, 0 pause input
0 input packets with dribble condition detected
29254 packets output, 10447720 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
0 output buffer failures, 0 output buffers swapped out
Any ideas?

Link Fail Alarm - SFP Ports

Hello,
I have been trying to configure the Link Fail Alarm on SFP ports for a Cisco CGS2520 (Cisco CGS-2520-16S-8PC).
SFP: GLC-FE-100FX-RGD (10-2360-02).
I can create a new Alarm Profile and attach it to the Ports that I want to monitor. The update Profile can then be saved to the startup-config and the configuration can be viewed as being correct.
If I then pull a fibre cable the Alarm is generated as expected.
However when I reboot the Switch the Alarm Profile is still within the configuration but it is no longer attached to the ports (i.e. the Alarm Profile configuration is shown on the startup-config however the running-config does not contain the alarm profile on the SFP port). Therefore when the Fibre Cable is removed no alarm is generated.
I have run through the procedure as defined in Chapter 7 of the Cisco CGS2520 Configuration Guide and as stated above copied the running-config to the startup-config.
Is anyone able to advise why the port attachment is lost when the switch is restarted – the Alarm Profile is retained.
Thank you,
Darsh

Hello,
I have been trying to configure the Link Fail Alarm on SFP ports for a Cisco CGS2520 (Cisco CGS-2520-16S-8PC).
SFP: GLC-FE-100FX-RGD (10-2360-02).
I can create a new Alarm Profile and attach it to the Ports that I want to monitor. The update Profile can then be saved to the startup-config and the configuration can be viewed as being correct.
If I then pull a fibre cable the Alarm is generated as expected.
However when I reboot the Switch the Alarm Profile is still within the configuration but it is no longer attached to the ports (i.e. the Alarm Profile configuration is shown on the startup-config however the running-config does not contain the alarm profile on the SFP port). Therefore when the Fibre Cable is removed no alarm is generated.
I have run through the procedure as defined in Chapter 7 of the Cisco CGS2520 Configuration Guide and as stated above copied the running-config to the startup-config.
Is anyone able to advise why the port attachment is lost when the switch is restarted – the Alarm Profile is retained.
Thank you,
Darsh

Configuring a 5508 via the SFP ports

Is there anyway to configure a 5508 via the SFP ports? Or do you have to use the service port for autoinstall or NCS auto provisioning? It looks like it grabs a DHCP address but it doesn't seem to like telnet,ssh ,http or https. There isn't anyone onsite.

Thanks, I got it figured out. The 5508 was plugged up to a switch that was configured for lag (for the 5508 that was hooked up before). I changed the port channel to put the native vlan on one that hands out DHCP. The blank 5508 grabbed an ip but wasn't working. I ended up disabling the other ports connecting to the 5508. I defaulted the switchport that was connected to the 5508's SFP port 1 and put it in the right access vlan. I was then able to ping the IP it grabbed and http in to it.
thanks though!

20gbit Port-channels using sfp+ ports

Hi,
I am hoping to implement a cost affective solution that can utilise the uplinks ports on the 2960-X & XR series switch and the appropriate up/downlink modules for the 3750-X series switch
Would anyone know if it is possible to bundle the 10gbit sfp+ ports into a 20gbit port-channel?
Has anyone done this or could they point me in the right direction for documentation?
Thanks

Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
BTW, don't forget, you only have two 10g ports per 3750X.

SFP ports and Giga ports

Hi all,
I am designing a network where fiber will have a key role and I am wondering what is the max throughput of a SFP port (1000BaseSX), and why would I go for that kind of port rather than a normal Giga port...
I have been looking around for documents and papers but nothing so far.
Thanks to help

Maximum throughput is based entirely on your appliance.
Switch Performance Portable Product Sheet
http://www.cisco.com/web/partners/downloads/765/tools/quickreference/switchperformance.pdf
Router Performance Portable Product Sheet
http://www.cisco.com/web/partners/downloads/765/tools/quickreference/routerperformance.pdf
Take note that the file is dated 2008 so I don't know how often Cisco updates these.
Hope this helps.

SFP ports

Hi ,
Could any one please tell me abt small form-factor pluggable (SFP) ports
? what exaclty is its function ?
regards
Neo

I think they come in different speeds. The ones I recently got were gig copper sfps. I think its main goal is to allow for fiber or copper at different speeds. say you dont want to spend the money on a totally gig switch, as they are more expensive, well you can get a 10/100 switch with 4 sfp ports in which you can place gig sfp modules to uplink over your existing copper links.
HTH

C2960S switches reset SFP+ ports hourly

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