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LINK DOWN BETWEEN CISCO 3750 AND 2950

Hi Guys,

I have two devices connected to each other using a crossover cable.

The first device output is as below

cisco WS-C3750G-12S (PowerPC405) processor (revision H0) with 118776K/12288K bytes of memory.

Processor board ID CAT0837Y165

Last reset from power-on

2 Virtual Ethernet/IEEE 802.3  interface(s)

12 Gigabit Ethernet/IEEE 802.3 interface(s)

The password-recovery mechanism is enabled.

512K bytes of flash-simulated non-volatile configuration memory.

Base ethernet MAC Address       : 00:12:01:8B:43:00

Motherboard assembly number     : 73-8307-08

Power supply part number        : 341-0048-01

Motherboard serial number       : CAT083707WC

Power supply serial number      : LIT083204Q2

Model revision number           : H0

Motherboard revision number     : A0

Model number                    : WS-C3750G-12S-S

System serial number            : CAT0837Y165

Top Assembly Part Number        : 800-21966-01

Top Assembly Revision Number    : L0

Version ID                      : N/A

Hardware Board Revision Number  : 0x07

THE SECOND DEVICE IS AS BELOW

Cisco Internetwork Operating System Software

IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(20)EA1a, RELEASE SOFTWARE (fc1)

Copyright (c) 1986-2004 by cisco Systems, Inc.

Compiled Mon 19-Apr-04 20:58 by yenanh

Image text-base: 0x80010000, data-base: 0x805A8000

ROM: Bootstrap program is C2950 boot loader

NALLIS_SW uptime is 5 hours, 48 minutes

System returned to ROM by power-on

System image file is "flash:/c2950-i6q4l2-mz.121-20.EA1a.bin"

cisco WS-C2950G-24-EI (RC32300) processor (revision K0) with 20713K bytes of memory.

Processor board ID FOC0835X48S

Last reset from system-reset

Running Enhanced Image

24 FastEthernet/IEEE 802.3 interface(s)

2 Gigabit Ethernet/IEEE 802.3 interface(s)

32K bytes of flash-simulated non-volatile configuration memory.

Base ethernet MAC Address: 00:12:00:DD:5A:00

Motherboard assembly number: 73-7280-05

Power supply part number: 34-0965-01

Motherboard serial number: FOC083526UH

Power supply serial number: DAB0834F2W5

Model revision number: K0

Motherboard revision number: A0

Model number: WS-C2950G-24-EI

System serial number: FOC0835X48S

I HAVE CONNECTED BOTH SWITCHES TOGETHER VIA GLC-T MODULE ON THE 3750 AND 2950-24smi ON A FASTETHERNET INTERFACE USING A CAT 5 CABLE.

KINDLY ADVISE.

4 REPLIES
VIP Purple

LINK DOWN BETWEEN CISCO 3750 AND 2950

1. Can you please paste the config both ports(1 port on 3750 and other on 2950....where they conbeed on these ports) ?

2. Sh int _ (for Both interface)

Reagrds

Please rate if it help.

LINK DOWN BETWEEN CISCO 3750 AND 2950

Hi Rustom,

Please perform the below checks to identify the root cause.

1) From 3750 try connecting a desktop/laptop directly and see the links coming up.

2) Please verify the T - connector which is used is a compatible one.

3) Please check with different speed settings i.e. auto - auto / speed 100 - duplex full.

4) try with the different cable. i.e. another cross cable & straight cable.

These tests will solve your issues or you will come to know the root cause.

Please do rate for the helpful posts.

By

Karthik

Silver

LINK DOWN BETWEEN CISCO 3750 AND 2950

What is the status of the interfaces on the devices?

Do a show interface and check status.

You can also do a show ip interface brief.

It is possible that the interfaces are admin down, which is typically the default. 

Hall of Fame Super Gold

LINK DOWN BETWEEN CISCO 3750 AND 2950

ON A FASTETHERNET INTERFACE USING A CAT 5 CABLE.

What kind of cable?

If you are using GLC-T, this means MDI/MDI-X is disabled, therefore you need a CROSSOVER cable. 

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