Cisco Switching/Routing :: 3750 (WS-C3750-48P ) Two Port Showing Err-disable And Amber

May 10, 2013

In our company 3nos Cisco 3750 (WS-C3750-48P) access switch in stake mode. All port are assigned with voice and data Vlan also Avaya IP connected with this switches. From last few days tow port 2/0/7 and 2/0/8 is showing amber and status is showing err-disable. At Avaya end it is showing a message “ETHERNET WAITING” in phone dispaly. I try to connect laptop directly with these ports but it is showing "Cross Connectivity". [code]

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Cisco Switching/Routing :: C3750 - Ethernet Port Goes To Err Disable Mode

Dec 6, 2011

I have stacked WS-C3750E-24PD with Ten Gigabit Ethernet ports configured under ether-channel. It has c3750e-universalk9-mz.122-55.SE1.bin IOS installed on it. One of the Ten Gigabit Ethernet ports, goes to err-disable mode with following errors on that specific ports.

%SFF8472-5-THRESHOLD_VIOLATION: Te1/0/2: Tx power low alarm; Operating value: -31.0 dBm, Threshold value:  -9.0 dBm.
%SFF8472-5-THRESHOLD_VIOLATION: Te1/0/2: Tx power low alarm; Operating value: -31.0 dBm, Threshold value:  -9.0 dBm. (DROmx-1-1)
I have gone through some of CSC forums like {URL}. The workaround is to "Remove the X2 or SFP from the inactive up link port" which is not in my case.

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Cisco Switching/Routing :: Port Goes Into Error Disable State 3750

Jun 29, 2012

We have a number of 3750 stacks used as access layer switches connecting Siemens VOIP phones and then a PC that connects to the phone.
For example if I plug PC A to the phone that connects to port 13 I pick up an IP addressand all works as predicted now if I plug in PC A to any other VOIP phone that connect to another port on the same switch it goes in error disable state ITs like the switch is holding my PC mac address and locks it down with the port which in my case is Gi2/0/13.
interface GigabitEthernet2/0/13
switchport access vlan 726
switchport mode access


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Cisco Switching/Routing :: 3750-48 Port Switch - IP Route Added Not Showing Up

May 30, 2013

We have a cisco 3750-48 port switch.We have a few SVI's configured and some static routes configured.I had created a new interface vlan and gave it an IP. I can ping the gateway.
Now I want to add a static route to go out that interface.when I add: ip route 10.x.x.x
it eccepts it (no errors) But, it does not show in the routing table nor in the config? How to add the static route to go out that vlan interface.

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Cisco Switching/Routing :: C2960G / C3750 - Any Way To Filter (on Ingress Port) Type Of Traffic

Jun 22, 2012

I have couple C2960G and C3750. Is there any way to filter (on ingress port) type of traffic? I would like to allow IP only, and discard (i.e.) IPX, or other garbage, that any device can produce.I have tried to find something about this, but only thing I have found is feature : protocol filter, which doesn't seems to be working on my hardware.

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Cisco Switching/Routing :: Stack Mac Persistent Timer Lacp Port Channels C3750

Sep 27, 2012

I am having an issue on a Cisco 3750 stack where when the stack master is rebooted, all my lacp port-channels drop and then come back up again. After doing some investigation It seems that it is happening because of lacp using the stack master mac-address as part of the system-id, so when the stack master reboots, the stack mac changes. I see that there is the command: stack-mac persistent timer 0

There is this warning about using this command:
When you configure this feature, a warning message displays the consequences of your configuration. You should use this feature cautiously. Using the old master MAC address elsewhere in the domain could result in lost traffic.
My question are:
Are there any other consequences to using this command (apart from moving the switch/mac to another location in the network)It mentions 'If the entire switch stack reloads, it acquires the MAC address of the master as the stack MAC address' Is this still the case if you have the stack-mac persistent timer to 0? Does using channel-group mode on for the port-channels still use the same mechanism of having a system-id? (Will the channels flap using 'mode on' when rebooting the stack master.

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Cisco Switching/Routing :: C3750-IPServicesk9-m - Cannot Ping VLan When No Port Connect To Switch

Nov 12, 2011

Why I cannot ping vlan when no port connect to switch.

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Cisco Switching/Routing :: Replacing 3750 24 Port With 3750 48 Port?

May 21, 2012

We have a stack of switches that is at the max number of members allowed in the stack. Problem is we are running out of port density and need to add more ports. So instead of adding a whole new stack I would rather replace 2 of the 24-port swicthes with 48-port switches.
If the two 24-port swicthes we are removing are stack members and neither of them are the stack master, I should be able to replace the 24-port switches with the 48-port switches without bringing the master offline? If the new 48-port switches are running the same IOS version as the current 24-port swicthes, they should add themselves to the stack?Would I have to tell the new 48-port swicthes what switch numbers they are replacing in order for them to be added to the stack since we are at the max number of members?Also since the 48-port swicthes are replacing 24-port switches will the master give the 48-port switches the configuration for only the 24-ports?

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Cisco Switching/Routing :: Enable / Disable OID's In Catalyst 3750-X Switch

Feb 19, 2013

In my ongoing project i need to monitor cisco 3750-X port status (uplink/downlink) i.e. whenever there is some problem at a specific port. I need to monitor it through an OPC server and right now what i am doing is as follows: i am using Kepserver and i have added SNMP driver in it for that purpose i  am not a networking expert but what i have learnt till now is that SNMP  agent (that resides in switch)  delivers the status of MIBs to SNMP  manager ( which in my case is kepserver (opc server)) for the above purpose i am adding IF-MIB to monitor OID (which shows port statuses) but when i add that in OPC server then it indicated that this OID is not available in the Switch ( it might be disabled) so i need to ask if there is any way to enable OID's in a switch,

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Cisco Switching/Routing :: 3750 Stack Switches Not Showing Up

Jan 27, 2013

We have several stacks of 3750 switches where this problem is occurring.  All of the switches are running IOS version 12.2(50)SE3.  (Yes, I know it's old.)
We're seeing inconsistency in how the stack reports members when issuing the following commands:
sow switch
show version
show inventory
Not all members are showing up in the output of the "show version" and "show inventory" commands.  For example:
HUNTI-WV-WDAC03#sh switch
                                           H/W   Current
Switch#  Role   Mac Address     Priority Version  State
1       Member 108c.cff2.ea00     15     0       Ready              
2       Member 8cb6.4f0a.a600     1      0       Ready              
*3       Master 8cb6.4f0a.9c00     1      0       Ready
(all three switches in stack are displayed)(code)

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Cisco Switching/Routing :: Catalyst 3750-X Not Showing VLAN As Active

Apr 14, 2013

I have installed a Catalyst 2960-S and a 3750-X-12S and I am trying to setup a VLAN 51 for some VoIP phones. I have added the VLAN as an interface on both switches, but the 3750 is not showing VLAN 51 as active when i do a show vlan. Also, it omitts showing Gi1/0/1 & Gi1/0/3 which are uplinks to 2960-S switches plugged in and working on VLAN1.
Catalyst3750SFP#show vlan
VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
1    default                          active    Gi1/0/2, Gi1/0/4, Gi1/0/5


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Cisco Switching/Routing :: 3750 SNMP Second Stack Is Showing Error

Mar 5, 2013

We have a stack setup with 2 C3750x-12s and 5 C3750x-48p switches.  We have two of these stacks.  One is working and responding with snmp just fine.  Our second one is showing the errors in the logThe only difference i see between the two stacks right now are the sw versions.

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Cisco Switching/Routing :: Show Inventory Not Showing All Members In 3750-stack?

May 1, 2012

I notice that show inventory not showing all members in a 3750-stack after we merged two stacks. Its only showing the master of the new stack, and the previous master of the old stack.

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Cisco Switching/Routing :: SF300 - Port Security / Possible To Disable?

Aug 2, 2012

I have several SF300 switches deployed (SF300-08, SF300-24P). They are connected to IP Telephones (NEC) which communicate with the switch for auto voice VLAN on LLDP. The problem I am experiencing is that periodically the IP telephones are rebooted by the telephone vendor and when they do the switch puts that port into "Locked" port security mode and discards all traffic to the port. The IP telephones of course do not work. In other switch models, I have seen the ability to enable / disable port security switch wide or on a port by port basis. This model does not appear to have this feature. How to disable or why the phones would cause the switch ports to "lock"? There is usually one PC attached to each phone.

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Cisco Switching/Routing :: 2960 - Disable TCP Port 4786

Mar 1, 2010

I have upgraded a couple of 2960G switches to 12.2.52SE and now discovered that TCP port 4786 is open on the switches.
I have looked in the document{URL}, trying to find a way to disable this function/port, but didn't find anything useful. Any way to disable this function/port?

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Cisco Switching/Routing :: 6513 - Disable Logging On Specific Port

Jan 18, 2012

Ask this question, if someone came across a 6513, one of the RJ45 ports are constantly falling.The question is how to disable logging on a specific portno logging event link-status does not work. 

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Cisco Switching/Routing :: 2960G Disable Srr-queue On Switch Port

Jun 20, 2012

I have a Cisco 2960G switch and one of the ports was configured with srr-queue bandwidth limit 90 - I need to remove this bandwidth limiting from this interface. [code]

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Cisco Switching/Routing :: 2960 Err-disable Port State Recovery

Jan 25, 2012

I am testing 2960 24 S  with storm-control  and Errdisable Port timer interval 60s , connected HUB on fa0/17 to make traffic / loop.After Strom Control detection the interface goes down thats ok  after 60s they will try to recover the interface and going up although the loop is still there.For my understanding if the interface detect still a loop on that interface they will disable the port again for 60s and will check  again. [code]

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Cisco Switching/Routing :: 1801 Not Showing Any Port Number?

May 12, 2012

I have configured the following access-list on routers fa0 interface (i am using 1801)
access-list 111 permit ip any any log
and applied it in "in" direction on Fa0 interface.
Now when i am sending ssh packets to this interface its showing below
*May 14 05:09:00.104: %SEC-6-IPACCESSLOGP: list 111 permitted tcp ->, 1 packet
why its not showing any port number ?

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Cisco Switching/Routing :: Monitoring Port-Security Error-Disable And HSRP With 1921 And 2960

Aug 1, 2012

I am looking to simply monitor Port-Security , Error-Disable and HSRP. I would like to receive an email when any of these are triggered.
Port Security - Port Is shut down
Err-Disable - Port goes into err-disable state (securedown)
HSRP - When HSRP standyby changes are detected
I need to receive emails with any of the able are triggered. What is the easiest way to do this? I know SNMP is the main option but I have never worked with SNMP and dont understand it too much.

2x Cisco 1921 series routers
3x Cisco 2960 POE switches stacked

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Cisco Switching/Routing :: 3560C Amber LED But No Error

Mar 22, 2013

I have a PS3 connected to a Gig port on my 3560. When I boot-up the PS3 I have to wait around 30 seconds for it to get DHCP.
I noticed the orange LED would stay on and go green after 30 seconds. I assumed I would have an error-state but I do not, the port show connected with no errors even though it's orange. I have no connectivity from the ps3 until the light goes green and then all is well. The port is access and I have manually configured duplex and speed.
Switch>show version
Cisco IOS Software, C3560C Software (C3560c405ex-UNIVERSALK9-M), Version 12.2(55)EX3, RELEASE SOFTWARE (fc2)


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Cisco Switching/Routing :: 3750 Stack Port

May 19, 2013

I have a stack of 4 3750 Switches.
1. WS-C3750G-12S
2. WS-C3750G-12S
3. WS-C3750X-48P
4. WS-C3750X-48P
The stack cable connected to Switch 1 Port 1 and Switch 4 Port 2 will not come back online. The logs show that there was a Stack line change. I have replaced the 1 meter Stack cable from Switch 1 to Switch 4 three times and it still does not come back online. This is the part that is interesting.. I have disconnected Port 1 Switch 4 and connected it to Port 2 Switch 4 and then Switch 4 came back online. This made me think Port 2 on Switch 4 was working correctly. Then I disconnected Port 2 Switch 1 and connected it to Port 1 Switch 1 and then Switch 1 came back online.

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Cisco Switching/Routing :: Stack Port Down On 3750

Mar 11, 2013

have a cable i think is bad, is it possiable to switch the cable out without causing any downtime to the switch or connected devices?
HQ-1st-Flr-Stack#show switch stack-ports summary
Switch#/  Stack   Neighbor   Cable    Link   Link   Sync      #         In 
Port#     Port              Length    OK   Active   OK    Changes   Loopback
Status                                          To LinkOK   


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Cisco Switching/Routing :: 3750 - How To Enable SFP Port

Nov 7, 2011

I am trying to configure a 3750 48 port switch and having trouble with getting it to see the sfp. I just want to set up the router with a pretty basic set up since I am using it for a ping test between 2 buildings, via fiber. How I can enable the sfp port?

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Cisco Switching/Routing :: WS-C3560-24PS / WS-C3560-48PS - Port With WAP Goes To Err-disable?

Oct 11, 2012

We have a Cisco switch in each office and every now and then the port that has the D-Link Wireless AP (DAP-1522) connected to it goes to err-disable state. Actually sometimes even a regular port that has a cisco phone connected may also go to err-disable state (less often). So I have to telnet into the switch and issue shut and no shut command on that interface to get it back to life, then it works for a few days or weeks until it happens again. Any suitable configuraiton for that interface, that would prevent that from happening or a workaround ?
Here's the info:
Model: cisco WS-C3560-24PS and cisco WS-C3560-48PS
This is the log from one switch:

31w5d: %PM-4-ERR_DISABLE: psecure-violation error detected on Fa0/2, putting Fa0/2 in err-disable state
31w5d: %PORT_SECURITY-2-PSECURE_VIOLATION: Security violation occurred, caused by MAC address 74e2.f592.f7f2 on port FastEthernet0/2.
31w5d: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/2, changed  state to down
And from another, which is almost the same:

5d10h: %PM-4-ERR_DISABLE: psecure-violation error detected on Fa0/3, putting Fa0/3 in err-disable state
5d10h: %PORT_SECURITY-2-PSECURE_VIOLATION: Security violation occurred, caused by MAC address d8a2.5e31.2cf6 on port FastEthernet0/3.
5d10h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/3, changed state to down
5d10h: %LINK-3-UPDOWN: Interface FastEthernet0/3, changed state to down
Here's the configuration of fe interfaces (they are all alike):

interface FastEthernet0/2
description Voice & Data Combo Port
switchport access vlan 11
switchport mode access
switchport voice vlan 15


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Cisco Switching/Routing :: 3750G - LED Lights Stay Amber

May 8, 2012

I have a Cisco catalyst switch 3750G has all LED lights staying amber still without blinking, I cannot console into it and it can’t boot past the POST.

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Cisco Switching/Routing :: Destination Port Protocol Is Down In 3750

Jun 18, 2012

I have configured SPAN in cisco 3750 switch as below mentioned. but the destination port protocol is down.switch(config)#monitor session 1 source interface gigabitethernet1/0/1switch(config)#monitor session 1 destination interface gigabitethernet1/0/11 ingress vlan 1

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Cisco Switching/Routing :: VTP Traffic Not Seen On SPAN Port On 3750

Dec 12, 2011

Been dealing with a strange problem for several days now.  It started out with a problem that I thought was VTP related but ended up being something else.  I setup a span port on a 3750 that I am connected to that was mirroring the trunk connection coming into the switch.
Never saw an VTP traffic come across the connection but doing a sh vtp status indicated the traffic was arriving and getting processed.  When I found some debug commands (debug sw-lan vtp), I was also able to see the packets go between switches.  Seeing this issue concerns me that there is other traffic that isnt showing up during a span session.
I know that doing a span on a switch, especially using a trunk port as a source, isnt a good idea.  Since I didnt have a TAP at time, this was my only choice.  I have since borrowed a NetOptics TP-CU3 tap from a good friend and was able to confirm the VTP traffic was going across the trunk connection between switches.
All of my 3750's are running 12.2.55.SE.

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Cisco Switching/Routing :: 3750 As A Port Channel Bridge?

Dec 7, 2011

I have 3750 core/distribution switches with routing enabled in two offices connected with copper link and L3 port channel interfaces. NewOffice#2 has moved about 5 miles farther away from office#1 and I have to deploy new core/distribution switch connect it to old core#2 via F.O and move all access switches with it. Old core will stay in old #2 offices as a bridge between office#1 and new office#2 Office#1core<->copper (Ethernet) <->oldoffice#2core<->f.o. <->new office#2core How I should configure port channels ports on oldoffice#2 core to act as bridge between office#1 core/dist and newoffice#2 core/dist without changing anything else (ip, etc) on whole network

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Cisco Switching/Routing :: 3750 No MAC Address On Switch Port

Apr 15, 2012

There 's a Cisco IP phone that sits between a PC and the switch port. On the switch port, no MAC address is learned. However, the switch is able to detect the IP phone and deliver power to it: [code] Switch is Catalyst 3750 with IOS version  12.2(58)SE1.

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Cisco Switching/Routing :: 3750 Port-security Will Not Clear

Jun 5, 2012

We have several 3750 stacks across our campus that we are unable to completely clear port security on. We have mac address stick set up on all access ports. When we clear the sticky address on the port, the mac address is removed from the running config like normal, but we keep getting port-security voilations. If port security is taken off the port completely, i.e. no switchport port-security, traffic still doesn't pass the port. Even clear port security across the stack doesn't work. If we try to reload the stack, only the master reboots, and the other switches in the stack lose switch capabilities.

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Cisco Switching/Routing :: 3750 Port Forwarding Inbound

Dec 15, 2011

I have a non-cisco router with a public WAN address. This is conencted to a 3750 switch internally. The switch is the default gateway for all VLANs, and the gateway router has static routes back to the 3750. The Router provides NAT, no NAT is done on the switch.My requirement is to port forward port 29 000 so that I can access a server on VLAN4 via this port.

So, I have: Router: Port 29000 map to (Switch VLAN4 address)
The question is, how do I route port 29000 from the 3750 to the server on ? what exactly I should add in order to port forward port 29000 incoming form my router, to my server on

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Cisco Switching/Routing :: How To Monitor 3750 Stacking Port In LMS

May 24, 2012

I would like to ask about 3750 stacking and some Cat6 stuff...
1) How do we monitor 3750 stacking port in LMS?
2) Let say if I stack 3 switches, middle switch should be Master. Uplink should be at Top and Bottom. Is best practice?
3) Can we mixed 3750G and 3750X and what is result internal BW - fallback to 32Gps?
4) is there any Qos difference between WS-X6816-10G-2T and WS-X6816-10G-2TXL?
5) is there any Qos difference between MSFC5 PFC4 and MSFC5 PFC4XL?
6) What is main difference between PFC4 and PFC4XL in Sup2T?
7) Pls share more about Central and Distributed Switching in Sup2T and which card support Distributed DFCXL?

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