Catalyst 2950 Series - Monitoring Port

Do the catalyst 2950 series have a port that can be used to connect a device that is designed to monitor all traffic on the switch - we are looking to install Webspy to track network & internet usage. The Sentinal product would best be connected to the switch where it can record all traffic - it needs a monitor port or some such equivalent.

Hi,
The 2950 does indeed support that - the functionality is called Switch Port Analyzer (SPAN). The following link has details on how to configure it:
http://www.cisco.com/en/US/products/hw/switches/ps628/products_configuration_guide_chapter09186a00800d84c5.html
Hope that helps - pls rate the post if it does.
Paresh

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CATALYST 2950 SERIES - CLEAR OPT TABLE & DISABLE CASH

I have 2 cisco switches model - catalyst 2950 series, i recently had an network issue regarding an ip conflict with one of my member servers, after being on the phone with microsoft support for 6 days, we were able to resolve the problem by locating the correct mac address and clearing the "OPT table on the switches" by unplugging and replugging the power cord. In order to prevent this from happening again, Microsoft had asked me to contact cisco and ask the following questions, " Are these swiches managable via the gui? and we also need to make sure that the "Arp Cash is disabled on the switches" can anyone help in this matter? Thanks in advance.

Hi Arrowext289,
Thank you for your question. However the Small Business Support Community is limited to Cisco Small Business Products.
Your question below relates to a Cisco Classic Product which our community would not be able to help you with.
The best area for you to post your question would be at the Cisco NetPro forums switching area located here: https://supportforums.cisco.com/community/netpro/network-infrastructure/switching
Best regards,
Cindy
Cindy Toy
Small Business Community Manager
Customer Advocacy
Cisco Systems, Inc.
www.cisco.com/go/smallbizsupport

Catalyst 2950 series

Hello everybody,
I have a Cisco Switch, model WS-C2950C-24 with the IOS version 12.0(5.3)WC(1).
I have created two VLANs, so I have trying to assign one Ethernet port to those VLANS,
I saw, this option is not avaliable. Switch(config-if)# switchport mode multi vlan [#], [#]. (this command does not exit).
When I typed switchport mode ? , It appears just access and trunk,
Could you help me to find a command to assign one port to several VLANs.?
Thank you.
Best Regards,

2950s do not support multi-VLAN ports. You need to make it a trunk if you need to pass more than one VLAN over a link.
You are seeing it in parser because you are running ancient 12.0 code(which also runs on XL series which support multivlan ports).

Catalyst 2950 Switch flash_init error

Hi Everyone,
I'm new to Cisco products and have a small home lab set up. I have a Catalyst 2950 switch that I would like to restore to factory defaults. Here is the issue I'm having and can't figure out.
I pull the power, telnet into the console port, hold the mode button and restore power. The boot loader (Version 12.1(11r) starts and says the usual message the system was interrupted prior to flash initialization (Paraphrasing here)
I get to the switch: command line, enter flash_init. Flash states it initialized and then all I get is a < with an underscore under it prompt. Anything I try to type comes up as bizarre characters and I can not get back to a switch: prompt unless I reboot the switch manually. Unsure of what to do here.
Thanks in advance!
-Matt
Telnet session:
C2950 Boot Loader (C2950-HBOOT-M) Version 12.1(11r)EA1, RELEASE SOFTWARE (fc1)
Compiled Mon 22-Jul-02 18:57 by antonino
WS-C2950T-24 starting...
Base ethernet MAC Address: 00:06:52:bb:c9:40
Xmodem file system is available.
The system has been interrupted prior to initializing the
flash filesystem. The following commands will initialize
the flash filesystem, and finish loading the operating
system software:
flash_init
load_helper
boot
switch: flash_init
Initializing Flash...
flashfs[0]: 4 files, 2 directories
flashfs[0]: 0 orphaned files, 0 orphaned directories
flashfs[0]: Total bytes: 7741440
flashfs[0]: Bytes used: 3726848
flashfs[0]: Bytes available: 4014592
flashfs[0]: flashfs fsck took 7 seconds.
...done initializing flash.
Boot Sector Filesystem (bs:) installed, fsid: 3
Parameter Block Filesystem (pb:) installed, fsid: 4
õíííííí <---These characters appear no matter what keys I hit.

Hi mattymattlynch
Check the workaround on the following documents:
http://www.cisco.com/c/en/us/support/docs/switches/catalyst-2950-series-switches/41845-192.html
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2950/software/release/12-1_22_ea11x/configuration/guide/scg/swtrbl.html
If no luck , the flash might be corrupted and requires a replacement.
Hope this helps
-Randy-

Password reset on a Cisco Catalyst 3550 series

We have a Cisco Catalyst 3550 series, and we don't have the password to gain access to the switch through a web browser. My question is if I reset the password using Hyper-terminal, does changing the password affect any vlan or fiber optic settings that I should know about. Or does resetting the password changes our switch to factory settings?

Hi,
The password recovery procedure for your switch is described in this document:
http://www.cisco.com/c/en/us/support/docs/switches/catalyst-2950-series-switches/12040-pswdrec-2900xl.html
If you follow the instructions in the document exactly, you will retain the original configuration - you just rename the configuration file so that it is not loaded when the switch boots up. However, you will still be able to display it after the switch boots up using the more flash:config.old . Eventually, you can even load it into running-config using copy flash:config.old running-config command. At that point, the old passwords will be brought back but because you already are in the privileged EXEC mode, you can change them and save the updated configuration.
VLANs should not be affected as long as you do not delete the vlan.dat file located in FLASH. Fiber optic ports should not be affected as long as you are using original Cisco GBICs. If you're using 3rd party GBICs, it may be necessary to enter the service unsupported-transceiver hidden command in the global configuration mode before they get recognized.
Good luck!
Best regards,
Peter

POST error Catalyst 2950

I have a Catalyst 2950 series 12 prt. switch. When the switch is booting I receive the following error: "00:00:13: POST: Packet DA mismatch on port: 9"
What does this message means? Can I still use this port?
Kind regards,

This is part of the power on self test(POST).
The switch sets the interface to loopback and sends
a packet. If anything is wrong or changed with
the packet then you get an error. In this case
the DA (destination address) was changed on
the received packet. I assume since this is a
switch they are referring to the layer2 address.
I would think this would indicate a possible hardware
failure.

DHCP on Cisco Catalyst 2950 Switch

Hello
I need to configure my cisco catalyst 2950 series switch in order to act as DHCP server for devices connected to its ports.
Please say me, how to do that ?
Thank you
Narek

Please find the sample DHCP configuration for one of the VLANs.
Interface Vlan1
description Cisco DHCP
ip address 10.10.2.1 255.255.255.0
ip dhcp pool cisco
network 10.10.2.0 255.255.255.0
default-router 10.10.2.1
domain-name mydomain.com
dns-server 10.10.2.10
netbios-name-server 10.10.2.15
lease 7
A 24 hour lease is the default if left out and the netbios-name-server is WINS in the Windows world.
If you want to use DHCP server for other VLANs as well create similar DHCP pools and assign the DG to the corresponding VLAN interface IP.
HTH, rate if it does
Narayan

Help with Catalyst 2950 G

Hi,
I have a doubt about the Catalyst 2950 series, i need to pass both IP and OSI traffic trought a 2950 switch. Is it supported?
Thanks

The 2950 is a layer2 switch. Anything carried over ethernet will go, no matter which layer3 protocol is used.
Regards,
Leo

Trunking Catalyst 2950 to Catalyst 3750 problem

I cannot seem to figure out how to trunk a catalyst 3750 to a Catalyst 2950.
I've set
3750(config)#interface fastethernet 1/0/2
switchport mode trunk
switchport trunk encapsulation dot1q
BUT my Catalyst 2950 does not offer the "switchport trunk encapsulation dot1q" command
My 2950 is running IOS version 12.1(20)EA1a
is there a work around for this situation. Our network still employs a bunch of these 2950's.

The Catalyst 2950 series can only do 802.1Q trunking. It's the default, and only, choice. So there's no need to specify it when trunking.
In fact, since you don't have a choice of which encapsulation to use, there's no need for a "switchport trunk encapsulation" command. Which is why it's missing from the Cat2950 switch IOS.
This took me by surprise too, when I first transitioned out of the 3500XL series into 2950 and 3550 switches.

Catalyst 2950: SNMP queries

Hello,
I want to get the following information from CISCO's Catalyst 2950:
1. Port's status: Up / Down
2. What MAC is connected to the port
3. Number of messages transmitted and received from the port.
What OID should I use for this purpose ?
For a reference I want to use ireasoning MIB browser.
What MIB file should I download from CISCO's FTP site ?
Thanks,
Zvika.

Up/down : 1.3.6.1.2.1.2.2.1.8 (ifOperStatus)
MAC addresses : 1.3.6.1.2.1.17.4.3.1.1 (dot1dTpFdbAddress)
Number of "messages" (I assume you mean packets) : 1.3.6.1.2.1.2.2.1.11 (ifInUcastPkts), 1.3.6.1.2.1.2.2.1.17 (ifOutUcastPkts)
For these objects you'll want the IF-MIB and the BRIDGE-MIB.

Catalyst 2950 Standard or Enhanced Image

Hello,
can someone, please, tell me the software difference between Catalist WS-C2950G-24-EI and WS-C2950C-24. The product adviser is not very clear about it.
Thank you in advance.
Cordially.
Maxime FRolov

Hello Maxime,
basically, the EI has more advanced QoS and Security features.
Check this document for a comparison:
Cisco Catalyst 2950 Series
Software Feature ComparisonStandard Image (SI)
and Enhanced Image (EI) Feature Comparison
http://www.cisco.com/warp/public/cc/pd/si/casi/ca2950/prodlit/1855_pp.pdf
HTH,
GP

Catalyst 2950 Blocking ports by default?

I see the layout you have, but is something not actually working?
Such as you are not able to access something.

Good day,Working on an old network that has an old unmanaged 24 port switch. They also have a Catalyst 2950 they were able to get. I reset it, setup passwords, enabled SNMP, and gave it an IP address so I can monitor it.I want to move things from the unmanaged switch to the new switch. First, I just connected a single cable between the unmanaged switch and the 2950. Then, I moved a PC from the unmanaged switch to the 2950.After doing so, the computer is still on the network, can see everything, ping everything, etc etc all is good. However, this PC can no longer establish comms on particular ports.PC is .169, other client is .168.When connected to the UNMANAGED SWITCH
Text TCP 192.168.81.169:5413 192.168.81.168:57744 ESTABLISHED TCP 192.168.81.169:5413 192.168.81.168:57745 ESTABLISHED TCP 192.168.81.169:5413 192.168.81.168:57746...
This topic first appeared in the Spiceworks Community

Catalyst switch model 2950 series need ios image flash is unable to load.

Hi, i'm in need of ios image for cisco 2950 series switch, because when its boots up its shows me a error message, Error loading "flash:c2950-i6q412-mz.121-13.EA1.bin"

when switch gets reload its show me this message.....
Xmodem file system is available.
Initializing Flash...
flashfs[0]: 1 files, 1 directories
flashfs[0]: 0 orphaned files, 0 orphaned directories
flashfs[0]: Total bytes: 7741440
flashfs[0]: Bytes used: 1536
flashfs[0]: Bytes available: 7739904
flashfs[0]: flashfs fsck took 4 seconds.
...done initializing flash.
Boot Sector Filesystem (bs:) installed, fsid: 3
Parameter Block Filesystem (pb:) installed, fsid: 4
Loading ""...: permission denied
Error loading ""
Interrupt within 5 seconds to abort boot process.
Boot process failed...
The system is unable to boot automatically. The BOOT
environment variable needs to be set to a bootable
image

SPAN / Monitor Ports - packet switched on Line Card

Hi Forum,
I got a quick SPAN / Monitor question. I need to create a monitor session where the source is a VLAN. The question is if the L2 source and destination are switched internally on a different linecard to the the monitor destination, then does the SPAN port know about it.
I was wondering as in theory, the packet does not go on the backplane, then how does the switch monitor session know about it ??
Graham

Hi,
In the Catalyst 6500 Series, it is important to note that egress SPAN is done on the supervisor. This allows all traffic subject to egress SPAN to be sent across the fabric to the supervisor and then to the SPAN destination port, which can use significant system resources and affect user traffic. Ingress SPAN will be done on ingress modules so SPAN performance would be the sum of all participating replication engines. The performance of the SPAN feature depends on the packet size and the type of ASIC available in the replication engine.
See this link below that contains details about the SPAN on different platforms.
http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a008015c612.shtml#topic6
Regards,

SNMP on Catalyst 2950 switch - possible?

How can I add SNMP to my Catalyst 2950 switch? and what will this give me with regards to network monitoring etc. A lot of my networks go through this device and I what to get stats on port etc. I really hope you can help here.

Hi Chandru,
Here's what you should do. Firstly, go to the following site which will give you a list of MIBs supported on the 2950:
http://www.cisco.com/en/US/products/hw/switches/ps628/products_configuration_guide_chapter09186a00800d84cc.html
Then, open up the Cisco SNMP Object Navigator at:
http://tools.cisco.com/Support/SNMP/do/BrowseOID.do?local=en
Within that, click on 'View and Download MIBs' and then select the MIBs you are interested in to download/view them.
As an example, you can get counters on memory pools from the CISCO-MEMORY-POOL-MIB
Hope that helps - pls rate the post if it does.
Regards,
Paresh.

Catalyst 2950 Series - Monitoring Port

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