Catalyst 2950 sockets ios 12.1.22

There are several listening sockets on the management interface, as output form
show ip sockets
The listening port numbers are 67,68,2228.
I do not know what is being used on these ports. DHCP is handled by another machine. 2228 i have no idea, but either of them could be used as a catalyst for any traffic.
How do i shut these off??

67 udp bootstrap protocol server. listening port on bootp & dhcp servers. clients broadcast to it for boot or network parameters. security concern: can probe nis domain name; plus a valued dos target
68 udp bootpc.'bootp/dhcp client; bootstrap protocol client'.
ehome-ms Port 2228 TCP eHome Message Server
ehome-ms Port 2228 UDP eHome Message Server
Peter Gabriel January 2006

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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 - Problem updating IOS

I am trying to upgrade from version 12.1 (14) EA1a to version 12.1 (22) EA5 on a Catalyst 2950. When I look at the flash directory, I see the following:
Directory of flash:/
2 -rwx 269 Jan 01 1970 00:01:27 env_vars
3 -rwx 1247 Mar 09 1993 06:09:06 config.text
4 -rwx 5 Mar 09 1993 06:09:06 private-config.text
7 -rwx 110 Mar 01 1993 00:01:39 info
8 -rwx 2958970 Mar 01 1993 00:03:19 c2950-i6q4l2-mz.121-14.EA1a.bin
9 drwx 2304 Mar 01 1993 00:04:30 html
84 -rwx 110 Mar 01 1993 00:04:41 info.ver
7741440 bytes total (2480640 bytes free)
When I try to delete the old file (c2950-i6q4l2-mz.121-14.EA1a.bin), I receive a message that the No such file or directory exists. There is no typo when I entered the filename. Also, there seems to be a discrepancy in what free bytes are being shown as available. The system shows 2480640 free bytes, but by my calculations, there should be 4778425 bytes available. Are they files that are hidden and why can I not delete the other file? Thanks.

Hi,
Are you able to dlete any other file except this from the flash. This could be a problem in accessing the flash properly. I would suggest try formatting the flash:, this will make the flash sectors empty and will be as a new scratched one. This should help in uploading the new IOS.
***** Please make sure that the switch doesnot reboot at while while you format the switch and upgrade the IOS as the switch will fall in rommon with any image.
HTH,
-amit singh

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.

2950-24 IOS to upgrade or not

Greetings all,
I have 2 Catalyst 2950-24 switches with 12.1(11)EA1 IOS on them. Aside from extra bells and whistles (like multicast load balancing), are there any compelling reasons to upgrade the software? Any compelling reasons not to?
Thanks, Dave

Thanks, thats what I thought. It was just that prior experience has taught me that newer doesn't always mean better or more stable, and I wanted the opinion of those with realworld experience on these switches. I've tried browsing the Cisco site to determine the IOS I should get. Am I right that 12.1(22)EA4 is the most current?

Catalyst 2950 - Radius

Is it possible of crypter the password radius-server on a catalyst 2950. (example: "radius-server key 7 toto")?

Tagging on to this discussion from another thread in the forum:
Actually the answer to this question is very highly release dependent. Earlier releases did not support it. Current releases do. I am not sure where the change is and believe it may be a 12.3 (or maybe even a 12.3T) enhancement. I have quite a few routers (most with TACACS and some with Radius) where the key is encrypted. When I started with those routers the key was not encrypted. At some point in doing a software version upgrade the keys for TACACS/Radius started being encrypted.
The encryption of the TACACS/Radius key is part of the service password encryption. The service has been enhanced several times to increase the number of keys that it protects. If you have service password encryption enabled (and in a live network I hope that you do) and have a release that supports the new enhancement your TACACS/Radius key will be encrypted automatically. If your version of IOS does not support it yet the key will not be encrypted.
HTH
Rick

Catalyst 2950 / ip dhcp-server

Hello,
who can explain the use of ip dhcp-server on Catalyst 2950?
cat2950-03(config)#ip dhcp-server ?
Hostname or A.B.C.D IP address or Name of DHCP server
The "Catalyst 2950 and 2955 Cisco IOS Commands":
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat2950/12122ea2/2950cr/2950cr.pdf
does not list that command.
Is it the same as "ip helper-address xxx.xxx.xxx.xxx" without forwarding the other protocols like dns, netbios, and so in or does it configure the ios dhcp-server ( that should not be included on cat2950 - as far as I know)
Greetings from Germany
Sven

Looks like it configures a remote DHCP server.
cat2950-03(config)#ip dhcp-server ?
Hostname or A.B.C.D IP address or Name of DHCP server
So, say you have a DHCP server address of 10.34.1.1, the command would be
cat2950-03(config)#ip dhcp-server 10.34.1.1
That way the hosts on the switch will now where to send the requests for an IP address. Kinda like a Gateway address.
Just my thoughts, Please rate if this helps
Scott

Cisco ISE and Catalyst 2950

Hello!
Please, could you help me? Is it possible to install ISE on Catalyst 2950? In Component Compatibility Guide
http://www.cisco.com/en/US/docs/security/ise/1.0.4/compatibility/ise104_sdt.html
Catalyst 2950 only support 802.1X and VLAN.
At first I need to know about VLAN change(from resticted to corporate). Is Catalyst 2950 support it?
Thaks for help!

this would let both user and machine authenticate. for"5434Endpoint conducted several failed authentications of the same scenario" check Suppress Anomalous Clients option. This issue comes in to picture when endpoint attempts a couple of failed authentications and if Suppress Anomalous Clients option with Reject Requests After Detection is enabled then ISE Policy nodes protect themselves from overwhelming numbers of authentication requests by sending an immediate reject for suppressed clients as opposed to processing all the steps in a normal authentication. So if that user did some authentication failure, he will be locked for 1 hours (bydefault).

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

Cluster Management Software on Catalyst 2950

Hi There,
I was wondering if anyone would be kind enough to provide me with some help on getting the CMS software running on a Cisco Catalyst 2950 Switch. I have followed all the instructions I could find on getting the software to load from the Switch, but it will not load. Can anyone help me?
Thank you in advance.
John Grikes
[email protected]

You can start from: http://www.cisco.com/warp/public/473/59.html

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-

Cisco Catalyst 2950/2960/3750 Multicast Traffic Preference

Hello all,
we, as a student company act as an ISP for university dormitories. We would like to (if it's possible) deploy QoS to prefer multicast traffic over all other types of traffic.
Devices used in network:
Acces layer: Cisco Catalyst 2950, 12.1(22)EA14
Dristribution layer: Cisco Catalyst 2960G, 12.2(58)SE1
Core layer: Cisco Catalyst 3750G, 12.2(52)SE
Do you see any possibility to solve this with these devices? We have almost no experience with QoS, therefore any help would be greatly appreciated.
Thanks in advance.

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Hmm, I think it should be doable although the 2950s, if non-E variants, are especially weak in QoS features. I.e. those might create some issues.
With the 2960G and 3750G, you often will create problems when you enable QoS because QoS, by default, allocates its buffers resources for 4 egress queues per port rather than using all for 1 egress queue per port. However, this can be countered by QoS parameter tuning, but that takes some QoS expertize to match to your traffic and your overall QoS policy.

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.

IP Accounting on catalyst 2950

Hi all,
Is there a way to find out traffic information from source IP to destination IP, like ip accounting used on routers, on the catalyst 2950 switch. My switch has the standard image.
Also what performance impact would it have on the switch, if possible to implement.
Thanks,
George

Hi dukenukem,
no there is no way of interpreting flow information that way on a c2950. A c2950 is a L2 Device. Normally it doesn't really care about ip adresses.
Regards,
Sebastian

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

Catalyst 2950 sockets ios 12.1.22

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