Cisco :: Enabling Net Flow In 2960 And 4948 Switches

Aug 26, 2012

I am unable to input the command "ip flow-cache timeout active 1" to my cisco 2960 and 4948 switches. But i am able to do so in my cisco 6500 series switch. Hence how do i enable netflow on both 2960 and 4948 devices?My 2960 and 4948 are L3 switches. What commands or additional hardware module are required.

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Cisco Switching/Routing :: Enabling Flow-control In 2960s?

Nov 12, 2012

I met a strange problem after enabling flow-control in enviroment,
- 2 cisco 2960s 24ts-l have been created a stack
- IOS is 12.2(58)se2
- all ports have been enabled flowcontrol receive dersied
via show flowcontrol, I can see each Gigabyte Port have been enabled "flowcontrol receive desired" but, when I do the following tests

- connect equallogic ps4000xv to the port 21, I found the status of port is "input flow-control is off"

- connect one server with Broadcom Gigabyte Network adapter, which has been enable TX ON RX ON, or Auto, the status of the port is still  "input flow-control is off"    
I guess, the port status should be ""input flow-control is on". Test them with another port, I got the same result. why?

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Cisco 2960S - Enabling Flow Control On All Ports Interrupt Network Traffic?

Jan 20, 2013

I've been digging into some performance issues on a LAN that has a couple of 2960s. The monitoring software I'm using has indicated a high amount of discarded outbound packets (up to 5%). The suggested resolutions were to enable flow control.

My question is does enabling flow control on all ports interrupt network traffic at all? this is a production network so I had already planned on doing it during off hours but also wanted to know if I should be prepared for any significant drop in traffic.

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Cisco WAN :: 4948 / 6509 / 2960 - How To Implement Multicast On Network

Aug 4, 2011

We want to implement multicast on our network. We are going to use for  online teaching purpose. I am very new at Multicast and not have much  idea about it. We are not running any routing protocol in our network,  only static route. The multicast server is located at One of our office  and it is connected with L2 (Cisco 2960) switch, L2 switch is connected  to L3 switch(Cisco 4948). L3(Cisco 4948) and Core Switch(Cisco 6509)  with FWSM are connected with E-3 link with tunnel. Router 1 and Router 2  are connected with P2P ILL links which are terminated at serial  interface. The Multicast Server IP is The scenario of  our network are mentioned below:
Multicast  Server--->(L2 Switch)--->(L3 Switch)--->(Core  Switch)--->(FWSM)--->(Router 1)---->(Router 2)--->(L2  Switch)--->(Multicast Client)
 We  have created a seprate vlan (i.e. vlan 102,   interface IP is for multicast at L3 switch, enable  multicast routing, defined rp-address(i.e., enable  sparse-dense mode at multicast vlan as well as at some other vlan also  for testing purpose and joined multicast group (i.e. Multicast IP is At core switch we have also enabled multicast routing,  defined rp-address (i.e., enable sparse-dense mode at  user vlan and inside vlan of FWSM and joined multicast group at user  vlan and inside vlan. At FWSM we have enabled multicast routing, defined  rp-address(, doesn’t find any option to enable  sparse-dense mode and joined Multicast group at inside vlan and router 1  vlan. At Router 1, we have configured the same thing. We have  configured mroute at all the devices. We are able to ping from end to  end. We are testing multicast by Multicast IP checker tool (provided by  vendor). Multicast is working fine at L2 switch, L3 switch and Core  Switch, but not from Router 1. Ping is reachable from Router 1. After  doing mtrace at Router 1, the following output has come:
Router 1 (Mtrace with destination address
Type escape sequence to abort.
Mtrace from to via group
From source (?) to destination (?)
[Code] .....
If , we do mtrace from gateway IP address(i.e. as  destination address then mtrace is getting completed, but if mtrace is  done from Mutlicast server IP address( as destination  address, then mtrace is not getting completed.
  We  have connected one laptop at Router 1 vlan to test Multicast. The host,  which is connected to Router 1 vlan is able to send multicast packet to  other host and other host at different vlan are receiving it , but it’s  unable to receive multicast packet send by other host of different vlan.
Do I need to enable igmp snooping at L2 switch, L3 switch and Core Switch ? I am not able to understand or can't figure out where i have configured wrong.

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Cisco Switching/Routing :: Catalyst 2960 Drops Packets After Enabling QoS

Nov 4, 2011

why the QoS deployment causes ports on 2960 switches to drop packets although there is no bandwidth contension? (output bit/second of the interface)packet drops at threshold 1, queue 2 ( queue 3 in config)
We are using Catalyst 2960 switches and are experiencing issues with QoS. After the QoS, we experience a lot of packet drops and it make the network slow. It appears that the slow performance relates to the egress queuing of each port.
Cisco IOS Software, C2960 Software (C2960-LANBASEK9-M), Version 12.2(50)SE5
switch_06#show inter fa0/1 | in drops|queue|output
input flow-control is off, output flow-control is unsupported
Last input never, output 00:00:01, output hang never


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Cisco :: Configure NTP Between 6509 And 4948 Switches?

Nov 14, 2011

our 6509 is configured as NTP master. Our 4948 is configured as NTP client.on each of these switches we have configured a management VRF.The problem is that 4948 can not synchronize its clock with NTP master. Both switches are directly cdp neighbor on 4948 switch:
6K5                Fas 1             138             R S I  WS-C6509- Gig 2/2/43

interface config on 6509:

interface GigabitEthernet2/2/43
description *** Mgmt Switch Externe 1 ***
switchport access vlan 1900
switchport mode access
wrr-queue cos-map 1 1 1


debugs on 6509 do not show any packets received or sent to 4948.

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Cisco Switching/Routing :: Add 2960 To Stack Of 4 X 2960 Switches

Feb 7, 2012

I have an existing stack of 4 x 2960-S switches connected by stack cables.I would like to add another 2960-S switch to the stack but am unable to as the 2960-S will only allow 4 x 2960-S switches per I would add the 5th 2960-S switch to the existing stack of 4 x 2960-S switches.

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Cisco Switches :: Flow Control And Back Pressure Setting On SLM248G?

May 31, 2011

On my Cisco SLM248G Switch the Back pressure and Flow control are currently disable.For the Flow control is it best to set it to enable or just Auto negotations and for the Back pressure is it ok the Enable it.This Cisco Switch has 3 servers and 15 laptop users connected to the ports.Will there be a draw back to enable these settings.

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Cisco Switches :: SF200 Witches Will Simply Freeze / Blocking All Traffic Flow

Mar 18, 2013

We have been deploying Cisco SF200-24P switches for our systems for over a year now. They connect to a Cisco 881 router. In many cases we are also deploying Cisco AP541s.Over the last few months, on an intermittent basis, the switches will simply freeze, blocking all traffic flow. The power LED also goes dark. It appears the switch has frozen. The only thing that seems to revive the switch is a hard reboot by pulling the power cord. In the last couple of weeks, one site in particular has gone down a handful of times. That client of our is fed up. Our patience is running thin too.
I cannot see any indications in the logs to any event that might give a clue as to the problem. We definitely see this problem with the firmware and the (latest as of typing this). Not sure if with earlier 1.1.2 firmware.Without a fix, we likely will have to change switches and possibly vendors as we need a reliable switch.I see some vague references to a similar problem. And one reference to a SG300 series having what sounds like the same issue.

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Routers / Switches :: Password Not Enabling To Connect Wireless?

Aug 4, 2011

I have a wireless router at home and i have a PC and a mac enabled for it. I have recently bought an IPAD and i can't connect for some reason. When asked for the password it doesn't enable me to connect so I'm worried that i've forgotten my password.

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Cisco Switches :: Configuring 2960 And 300 ES Switches?

Jul 26, 2012

I have a 2960S switch and nine (9) 300 switches. I have three VLANs configured on them, data, voice and management. Each 300 has unique data and ovice VLANs corresponding to their locations. All of the 300 switches connect to the 2960 in a hub and spoke network topology via 802.1q trunks. I can access devices between switches on the data and voice VLANs fine from any other switch. My issue is that from any 300 switch I can access the 2960 management VLAN interface without a problem, but I can not access the 300 switch management VLAN that I am connected to from the CLI. I do not use the GUI at all for management.

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Cisco :: How To Manage Many 2960 Switches

Oct 3, 2011

I would like to as you that i have swiches 2960 (10Unit) and switches 3560 ( 3 unit) and router 2821 ( 1 unite) and AP( 10 unit).So do you know software can manage all those product? Like monitor switch up or down, manage configure, check performance.

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Cisco WAN :: Possible To Run VTP V3 On 2950 And 2960 Switches

Jan 2, 2013

Is it possible to run VTP V3 on 2950 and 2960 switches. If so what version of IOS supports V3? Our 2960s are running 12.2(25r)SEE1, and 2950s are running 12.1(22)EA4a. Neither of which supports v3.

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Cisco :: MIB For 3560 And 2960 Switches

Nov 30, 2011

have few doudts on MIB file upload.
1) What will be the extension of MIB file  ? *.mib or *.my
2) I am running with 12.2(25)SEB IOS .Is thre any dependency with IOS for downloading MIB file.
3)I have 3560 switch and 2960 switch. Is thre any difference in the MIB file extension.

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Cisco WAN :: Set Up Flex Stack On 2960 Switches?

Jul 15, 2012

I have to setup my first flex stack and wanted to make sure I do it right.  I have the physical aspect of the stack down.  From what I gathered I have to setup the master switch as the highest priority and then provision the other two switches.  But I have configs on the other two switches, do I have to delete them?  And do I have to setup individual ips for the two slave switches, because from what I saw the master switch is the only one with an ip address?  The master switch is a poe 2960S-48LPS and the two other switches are 2960G-48TD

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Cisco WAN :: VLAN On 2960 And 3560 Switches

Apr 10, 2011

We had a new building thats gone up and complete now and we're trying to get a ip phone working down that end of the school on a vlan. We seem to be having trouble with the VLAN going through on the 2960 switch but it works fine on our core 3560 switch.
There looks like a slight variation in the config of the switches, the 3560 switch supports the "switchport trunk encapsulation dot1q" command on the interface where as the 2960 doesn't support the  "switchport trunk encapsulation dot1q". Is this why the vlan is working on the 3560 and not the 2960, or is it something else?
Both switches are using the 12.2 IOS
Heres the trunk port configured on the 3560 going down to the new building and connecting into the 2960 with a 1gbit fiber link
interface GigabitEthernet1/2 description 3560X Port UpLink as Trunk Mode switchport trunk encapsulation dot1q switchport mode trunk udld port storm-control broadcast level 60.00 spanning-tree guard root
Heres the trunk port configured on the 3560 going to a Linksys switch which then connects to the DHCP server (The other end of the 3560 is also configued as trunk)
interface GigabitEthernet0/6 description Edge Switch port for clients switchport trunk encapsulation dot1q switchport mode trunk spanning-tree portfast
Heres the working vlan port on the 3560, the ip phone is able to get an ip and ring all other phones etc
interface GigabitEthernet0/7 description Edge Switch port for clients switchport access vlan 2 switchport mode access spanning-tree portfast
Ok now heres the config for the 2960
Heres the trunk port configured on the 2960 going back upto the 3560 switch
interface GigabitEthernet1/0/25 description Port UpLink as Trunk Mode switchport mode trunk udld port storm-control broadcast level 60.00
Heres the access port configured on the 2960 which isn't passing on vlan information. Is there another command i need to use to enable encapsulation as dot1q?
interface GigabitEthernet1/0/19 description Edge Switch port for clients
switchport access vlan 2 switchport mode access spanning-tree portfast

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Cisco Switching/Routing :: QoS In L2 Switches 2960 And 4500?

Mar 12, 2013

We have 3 layer LAN architecture, layer 1 of 6500(IP routing), layer 2 of 4500(L2 switch only), layer 3 of 2960(L2 Switch)In a Single (2960 and 4500) Switch Port Avaya IP phone and PC are connected.Now, the requirement is that, Qos need to be configured for Voice traffic and Data traffic should be in default class of service.We plan to use COS value in Switch 4500 and 2960. We made a sample configuration as below 
### For 4500 Switch
 class-map match-all VOIP-Access-2MB
  match cos  3  5
class-map match-all VOIP-Uplink-20MB
  match cos  3  5

check these configurations are correct as per standard and if there is any other method of configuration?What need to be configured in L3 Switch(6500)??In 2960, it doesn't support ingress QoS, what impact it will make when compare to 4500? do users experiance any difference?

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Cisco Switches :: 2960 / Priority Queue Out Handling?

Mar 6, 2012

We're testing the reference system shown in the figure below. System Description Four 2960 switches are used for transport;Equipment 1 and Equipment 2 exchange packets for synchronization;To reach synchronization  Equipment 1 and 2 must exchange data with a very low jitter. 2960 Configuration details Four our test puprose, we're using 100Mbit/s ports (22 and 23) as trunk.In order to obtain minimum jitter We performed these configurations:We Enabled QoS;We Marked Synchronization packets with CoS 7 and DSCP 63;We marked other kind of traffic inserted in different ports) with CoS 0;We set "trust DSCP" on trunk ports;On the trunk ports we mapped traffic with CoS 7/DSCP 63 (and only this) on output queue 1;We enabled the expedite queue (priority-queue out). QuestionWith these settings we aim at forcing our synchronization packtes to precede other kind of traffic and go from Equipment 1 to Equipment 2 with minimum jitter.Unfortunately we experienced  high jitter when both synchronization packets and other traffic are sent through the systems.

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Cisco Switching/Routing :: Are Non-S 2960 Switches Stackable

Jul 5, 2012

Are the non-S series 2960 switches stackable or are they only able to be uplinked?

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Cisco WAN :: Switches 2960 Series No Internet Access?

Mar 29, 2011

I have a problem I have Cisco 2960 series switches with ip address works but can not connect to the Internet

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Cisco WAN :: 2960 / 2811 - Connecting 2 Ports With Two Switches

May 18, 2012

I have a 2960 and a 2811 with a hwic card I have one port set as 100 meg and another port set at 10 meg. Both are set to access mode. i need one port for failover (10 meg) . I can't do ether channel on the hwic. How do I prevent a loop when I connect my second connection. While having both connections up. Should I use bpdu guard? the goal is to have one port fail over if the 100 meg goes down. And I'm currently running ospf so it should take the faster connection.

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Cisco Switches :: 2960 - Password Less Log In With Public Key SSH Authentication

Apr 13, 2010

I have a Catalyst 2960 switch (2960-8TC-L) and running Software version  12.2(53)SE1.I mange to configure SSH to the switch and add addition user as well.Now I need to configure this switch password less log in with public key SSH authentication.

I configured several Linux servers and Workstations for the public key SSH authentication.So far I could not figure out how to do this in CISCO switch. Following link {URL} how to do this.But ip ssh pub key- chain command never work showed invalid command.

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Cisco :: Difference Between Lite Entry And Base 2960 Switches

Jul 1, 2012

Thinking of getting one of those 8-port 2960 for a CCNP study. Is the difference between the C2960-8TC-S and the C2960-8TC-L models in Hardware, or in IOS? or both? And if it's in IOS, is the S upgradable to L?

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Cisco Switching/Routing :: Fiber Connection Between Two 2960 Switches?

Mar 22, 2012

Company I work for just moved into a new location.  We have two data closets which are patched as independent entities, with no Ethernet tie connection. These closets are roughly 100 feet apart. 
There is a fiber connection that runs between both closets, that the previous tenant used to connect the switches.  I have placed a Cisco 2960 switch in each location, and added one mini SFP gbic's to each switch.  After attaching both sides, neither light up.  I do a sh inter gig1/0/49 on each and shows 'down down' (not admin down).
What is the trick on getting these to communciate, do I need to configure these ports, and are they supposed to light up? 
What I am trying to accomplish is to get the one closet that is completely cut off, communicating by logically stacking, or 'daisy chaining' via fiber. 
I turned off the lights and popped the fiber out, and I do see a faint red light (I did not look straight into it), so I think the fiber is active.

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Cisco Switching/Routing :: 2960 Switches - IOS Upgrading For 4506e

Jul 21, 2012

I have 4506e core switch to which 10 other 2960 switches are connected.I want to upgrade thier IOS. how can upgrade it, can I upgrade it one by one or all at a time?
Is there any tool to perform this task?

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Cisco Wireless :: Connect Two 2960 Switches In Two Separate Buildings?

Feb 22, 2013

I am having a problem in connecting two Cisco 2960 Switches between two different buildings using Cisco WLC 2504 & 3 Wireless 1552S APs.
- One AP is directly connected to Switch - 1 where WLC is connected and serving as a RAP

- Another one is working as Mesh in the field.

- Third one is a Mesh Access Point wired to another Switch - 2. (Bridging is enabled)
All the APs, WLC & switches are in the same network 10.3.x.x subnet mask : is working with default management interface whereas switches are having VLAN1 configured as default VLAN.All the port for the switches are Trunk ports?Once i am trying to ping the RAP or any MAP from Switch - 1 I am sucessful but once i am pinging Switch - 2, its not replying. Similar is that case from Switch - 2 side.

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Cisco Switching/Routing :: 2960 Switches That Have Crashed Without Any Reason

Aug 12, 2012

I have a number of 2960 switches that have crashed without any reason                  
Under show version System returned to ROM by address error at PC 0x108971C, address 0x0

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Cisco WAN :: 2960 / 3560 Switches - Implementing QoS On MPLS Network

Jan 16, 2013

I am implementing QoS on our MPLS network. Our environment exists of a mix of Cisco 2960 and 3560 switches. The IPT system is Avaya CM with Avaya phones.The WAN network is a MPLS network.Ports are configured for access and voice vlan (no trunking), one vlan for voice, one for data (vlan 1 is disabled).I dont have Qos coonfigured on LAN just wanted to configure on WAN Router where my Mpls link is connected.I have 45 Mb Mpls links on all sites connected to each other.
I have multiple sites connected via MPLS and i have control at both sides.Current config is mentioned below in which DSCP marking is not done for signaling. What is the best config with example.Current Config on all Cisco Router where MPLS link is terminated at all sites. [code]

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Cisco Switching/Routing :: Private Vlans Across 2960 / 2950 Switches?

Nov 12, 2012

I am aware that private-vlans are not supported on edge switches like 2960 series - so my question is would it be possibel to ceate private vlans on say just the core switch which would be a 3570 or 4506 that supports private vlans and then just trunk these to the edge like normal vlans?what I need to achive is to have edge port not able to communicate to each other even across switches - which cannot be done using 'protected' port so need the private vlan feature?

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Cisco Switching/Routing :: Do The Catalyst 2960-S Switches Support Pre-standard PoE?

Jun 14, 2012

I have a customer with Cisco 7940 and 7960 IP phones that they do not plan to replace. They do want a new LAN and are looking at the Catalyst WS-C2960S-48FPD-L and WS-C2960S-24PD-L as access layer devices.
these switches support the Cisco pre-standard PoE required by the 7940 and 7960 IP phones.

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Cisco Switching/Routing :: Maximum Switches Per Stack For Catalyst 2960

Apr 23, 2007

Any one who knows where I can find a documentation where it says the maximum switches per stack for the Catalyst 2960 family?

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Cisco Switching/Routing :: LAN Base Software For 2960 Lite Switches?

Feb 6, 2012

We ordered 4x cisco 2960 switch with LAN Lite software by mistake. Can we upgrade them to Lan Base?When I change boot image I get Error: hardware not supported by firmware.

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Cisco Switching/Routing :: 2960 - Connecting Two Switches Using Fiber Cable

May 25, 2013

I need to connect 4 Floor Building with 4 Cisco 2960 - 48 ports switch each other and it needs to be through a fiber. So all PCs connected to each switch would reach the LAN/WAN from the other switch. (attached is the image here with)
I see that the 2960 has 2 SFP ports each port of each switch should connect each other or how?
My simple question is:
1. What cable / patch code I have to use = Single-mode or Multimode? ( distance for each switch will not more then 25 mts)

2. Do I have to use SFP or SFP+ module?

3. What kind of SFP/SFP+ module I have to use = Single-mode or Multimode?

4. What kind of connector should patch code have = LC / SC or ?

5. How to connect each switch with redundancy like ...each switch should be interconnected with each other or I have to choose Cisco 3750G which has more then 2  SFP ports (option#1 & opetion#2 = attached here with) =

Best practice for connecting cisco switches over fiber.

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