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

Similar Messages

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

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 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

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

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

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.

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

After upgrading ios Cisco Catalyst 6500 Series Supervisor Engine 2T ASA-SM is disabled

after upgrading ios Cisco Catalyst 6500 Series Supervisor Engine 2T to the latest release the ASA-SM module is not recognized it is disabled. the FPD
is not recognized any more. reverted back to previous ios with no luck

What IOS are you running on your Supervisor 2T? As long as it's 15.0(1)SY1 or later you should be OK. (Reference).
If it's not working with that I'd try reload of the ASA SM module (from IOS cli - e.g. "hw-module <module#> reset" and, failing that, "no power-enable module <module#>" followed by "power-enable module <module#>) while the new Supervisor is installed. Watch the log for relevant messages during that process.

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

How to remove the WiSM2 from the Catalyst 6500 series switch?

Hello, can you explain to me how to safely remove the WiSM2 from the Catalyst 6500 series switch?
According to the documentation "Catalyst 6500 Series Wireless Services Module 2 Installation and Verification Note":
To remove the WiSM2, perform these steps:
Step1     Shut down the module by one of these methods:
In privileged mode from the router prompt, enter the hw-mod module mod shutdown command. NoteIf you enter this command to shut down the module, you must enter the following commands in global configuration mode to restart (power down, and then power up) the module:
Router# no power enable module modRouter# power enable module mod
If the module does not respond to any commands, press the SHUTDOWN button located on the front panel of the module.
Step2     Verify that the WiSM2 shuts down. Do not remove the module from the switch until the POWER LEDis off.
But, in the case of Step1 (1st methods) I do not see a option "shutdown" in the command "hw-mod module 3"...
All I prompted to enter is:
c6500#hw-module module 3 ?
boot           Specify boot options for the module through Power Management Bus control register
reset          Reset specified component
simulate Simulate options for the module
Is it hidden options? IOS version of c6500 is 12.2(33)SXJ1
In the case of Step2 (2nd methods) there is not any button on the front panel of the module?
And yet, it is better to remove the module configuration manually or use the command module clear-config prior to removing the module?

Good catch.
Which one is true, will get back to you on this if i've something soon.
http://www.cisco.com/en/US/docs/wireless/module/wism2/installation/note/WiSM_2.html#wp34727
The above link is procedure to remove wism2. This procedure doesn’t look like wism2 is hot swapable.
http://www.cisco.com/en/US/docs/wireless/module/wism2/installation/note/WiSM_2.html#wp34621
All modules, including the supervisor engine (if you have redundant supervisor engines), support hot swapping. You can add, replace, or remove modules without interrupting the system power or causing other software or interfaces to shut down. For more information about hot-swapping modules, see the Catalyst 6500 Series Switch Module Installation Guide.

Catalyst 2950 interface problem

Hi, Sirs.
My Catalyst 2950-24 (IOS Ver 12.1.22EA7)stops communicate with an other switch port of a Catalyst 3512XL-EN after catalyst 2950 powered on 1 or 2 days.
th show interface shows that 2476498 ignored.
FastEthernet0/1 is up, line protocol is up (connected)
Hardware is Fast Ethernet, address is 000d.28c0.cf41 (bia 000d.28c0.cf41)
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, media type is 100BaseTX
input flow-control is unsupported output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 3d19h, output 00:00:00, 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 28000 bits/sec, 44 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
10033048 packets input, 806430104 bytes, 2476489 no buffer
Received 10031591 broadcasts (0 multicast)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 2476498 ignored
0 watchdog, 2217265 multicast, 0 pause input
0 input packets with dribble condition detected
357799 packets output, 25835259 bytes, 0 underruns
0 output errors, 0 collisions, 2 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
what does is mean?

Hello,
what other switches do you have in your network ? If you have just the 2950 and the 3500, make sure that the 2950 is the root switch for all your VLANs, by configuring the global command:
spanning-tree vlan x priority 0
Also, check the log on the 2950 for the following message:
SCHAN ERROR INTR: SRC=6 DST=5 OPCODE=20 ERRCODE=5
If you see those, chances are that you have a faulty unit. Here is the relevant bug info:
CSCdv83336 Bug Details
Under certain level of traffic load, the (2950) switch will start logging the following messages on the console:
SCHAN ERROR INTR: SRC=6 DST=5 OPCODE=20 ERRCODE=5
and after a few seconds, the switch will stop passing any traffic. In some cases, the switch seemed still forwarding broadcast and multicast traffic, which will cause STP problem if the switch has redundant link and is not supposed to be the root for the VLAN, as both port will go forwarding.
The same error message has been identified in CSCdu87836.
An assessment of the impact
Unit stops passing any traffic.
WORKAROUND
Several units were returned by CISCO. The units were re-screened to the latest test program, and failed the SDRAM memory test.
Customer should RMA unit back to Cisco
Regards,
Nethelper

Catalyst 2950 trouble

I have been trying to get a Catalyst 2950 switch to work for over a week now. I received the switches with no box or packaging and I was told that there were no previous setup attempts on it. I tried performing the express setup but the lights on the server don't seem to behave the way the instructions explain. I also was never able to make a connection between the linux server I am trying to use to configure the switch and the switch. All i received was the switch and nothing else. I have an AC power cord and I also found an RJ45 - DB 9 adapter if needed. I have looked through alot of the manuals on the cisco main pages and nothing seems to be working or clicking. Please help!

Results of pinging from switch to linux box and switch to switch were both 0%.
Switch2>show arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 192.168.1.10 - 000a.8a7a.f280 ARPA Vlan1
No luck pinging switch from linux box again...
Arp -a Results
c358-hsrp102.xxxxx.com (xxx.xxx.102.1) at 00:00:0C:07:xx:xx [ether] on eth0
Route -n Results
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
xxx.xxx.102.0 0.0.0.0 255.255.254.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1
0.0.0.0 148.174.102.1 0.0.0.0 UG 0 0 0 eth0
Ifconfig results
eth0 Link encap:Ethernet HWaddr 00:13:72:FD:xx:xx
inet addr:xxx.xxx.102.78 Bcast:148.174.103.255 Mask:255.255.254.0
inet6 addr: fe80::213:72ff:fefd:871d/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:38172 errors:0 dropped:0 overruns:0 frame:0
TX packets:16406 errors:0 dropped:0 overruns:0 carrier:0
collisions:224 txqueuelen:1000
RX bytes:8127476 (7.7 MiB) TX bytes:3941903 (3.7 MiB)
Interrupt:169
eth1 Link encap:Ethernet HWaddr 00:13:72:FD:87:1E
inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::213:72ff:fefd:871e/64 Scope:Link
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Interrupt:225
eth2 Link encap:Ethernet HWaddr 00:04:23:CD:B5:6A
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Base address:0xecc0 Memory:fe9e0000-fea00000
eth3 Link encap:Ethernet HWaddr 00:04:23:CD:B5:6B
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Base address:0xec80 Memory:fe9c0000-fe9e0000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:6376 errors:0 dropped:0 overruns:0 frame:0
TX packets:6376 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:4647441 (4.4 MiB) TX bytes:4647441 (4.4 MiB)
sit0 Link encap:IPv6-in-IPv4
NOARP MTU:1480 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Lot of info there you are only allowed 3 attachments thats why i put it all in here and attached the last 2 hope you can find everything ok.

CATALYST 2950 SERIES - CLEAR OPT TABLE & DISABLE CASH

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