Cannot Uplink/Daisy Chain Cisco 2960 S Series Switch to Cisco 3750 Switch

[dasgill]

I have a new Cisco 2960 S series switch with a basic configuration that needs to be uplinked or daisy chained to a Cisco 3750 switch. I am not getting any connectivity to the network with either a straight through or crossover cable. the port remains in amber but a 'show interface' indicates that the interface is up. I can manage the switch with a PC patched into any port on the switch with a static IP address. Must be something very simple that I am missing. Outlined below is the configuration.

Refresh_SW1#sh ver

Cisco IOS Software, C2960S Software (C2960S-UNIVERSALK9-M), Version 12.2(55)SE3,

RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2011 by Cisco Systems, Inc.

Compiled Thu 05-May-11 16:56 by prod_rel_team

Image text-base: 0x00003000, data-base: 0x01B00000

ROM: Bootstrap program is Alpha board boot loader

BOOTLDR: C2960S Boot Loader (C2960S-HBOOT-M) Version 12.2(55r)SE, RELEASE SOFTWA

RE (fc1)

Refresh_SW1 uptime is 1 hour, 13 minutes

System returned to ROM by power-on

System restarted at 14:40:48 UTC Mon Feb 6 2012

System image file is "flash:/c2960s-universalk9-mz.122-55.SE3/c2960s-universalk9

-mz.122-55.SE3.bin"

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Importers, exporters, distributors and users are responsible for

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cisco WS-C2960S-24PS-L (PowerPC) processor (revision D0) with 131072K bytes of m

emory.

Processor board ID FOC1551X07F

Last reset from power-on

1 Virtual Ethernet interface

1 FastEthernet interface

28 Gigabit Ethernet interfaces

The password-recovery mechanism is enabled.

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

Base ethernet MAC Address       : C4:0A:CB:52:12:80

Motherboard assembly number     : 73-11908-06

Power supply part number        : 341-0393-02

Motherboard serial number       : FOC15496YHB

Power supply serial number      : DCA1546U1F5

Model revision number           : D0

Motherboard revision number     : A0

Model number                    : WS-C2960S-24PS-L

Daughterboard assembly number   : 73-11933-04

Daughterboard serial number     : FOC15495WU9

System serial number            : FOC1551X07F

Top Assembly Part Number        : 800-30945-02

Top Assembly Revision Number    : C0

Version ID                      : V02

CLEI Code Number                : COMGE00ARB

Daughterboard revision number   : A0

Hardware Board Revision Number  : 0x01

Switch Ports Model              SW Version            SW Image

------ ----- -----              ----------            ----------

*    1 28    WS-C2960S-24PS-L   12.2(55)SE3           C2960S-UNIVERSALK9-M

Configuration register is 0xF

Refresh_SW1#sh run

Building configuration...

Current configuration : 1852 bytes

!

! Last configuration change at 15:53:49 UTC Mon Feb 6 2012

! NVRAM config last updated at 15:46:39 UTC Mon Feb 6 2012

!

version 12.2

no service pad

service timestamps debug datetime msec

service timestamps log datetime msec

no service password-encryption

!

hostname Refresh_SW1

!

boot-start-marker

boot-end-marker

!

enable secret 5 ***************.

!

!

!

no aaa new-model

clock summer-time UTC recurring last Sun Mar 1:00 last Sun Oct 2:00

switch 1 provision ws-c2960s-24ps-l

!

!

!

!

!

spanning-tree mode pvst

spanning-tree extend system-id

!

!

!

!

vlan internal allocation policy ascending

!

!

!

interface FastEthernet0

no ip address

!

interface GigabitEthernet1/0/1

!

interface GigabitEthernet1/0/2

!

interface GigabitEthernet1/0/3

!

interface GigabitEthernet1/0/4

!

interface GigabitEthernet1/0/5

!

interface GigabitEthernet1/0/6

!

interface GigabitEthernet1/0/7

!

interface GigabitEthernet1/0/8

!

interface GigabitEthernet1/0/9

!

interface GigabitEthernet1/0/10

!

interface GigabitEthernet1/0/11

!

interface GigabitEthernet1/0/12

!

interface GigabitEthernet1/0/13

!

interface GigabitEthernet1/0/14

!

interface GigabitEthernet1/0/15

!

interface GigabitEthernet1/0/16

!

interface GigabitEthernet1/0/17

!

interface GigabitEthernet1/0/18

!

interface GigabitEthernet1/0/19

!

interface GigabitEthernet1/0/20

!

interface GigabitEthernet1/0/21

!

interface GigabitEthernet1/0/22

!

interface GigabitEthernet1/0/23

!

interface GigabitEthernet1/0/24

!

interface GigabitEthernet1/0/25

!

interface GigabitEthernet1/0/26

!

interface GigabitEthernet1/0/27

!

interface GigabitEthernet1/0/28

!

interface Vlan1

ip address 128.100.100.110 255.255.0.0

!

ip default-gateway 128.100.1.1

ip http server

ip http secure-server

ip sla enable reaction-alerts

!

line con 0

line vty 0 4

password *****

login

line vty 5 15

password *******

login

!

end

Refresh_SW1#

[viswamin]

Few questions:

1. From where are you trying to check the connectivity to the network?

2. 2960 is a L2 switch alone. so was the link b/w 2960 and the 3750 configured as Trunk?

3. use the cross over cable for connecting two switches.

4. from the switch can you ping the default -gateway 128.100.1.1 ?

-Vijay

[dasgill]

1. From where are you trying to check the connectivity to the network?

Ans - From the LAN and a PC(static IP) patched into the switch.

2. 2960 is a L2 switch alone. so was the link b/w 2960 and the 3750 configured as Trunk? No.

3. use the cross over cable for connecting two switches. Tried that already

4. from the switch can you ping the default -gateway 128.100.1.1 ? No

[ARMANDO ALVARADO]

Have you forced the port to full duplex and speed 100. Does the switch have a ip address. Are going to pass traffic thru this switch.

[dasgill]

Have you forced the port to full duplex and speed 100. I will try that.

Does the switch  have a ip address. It does.

Are going to pass traffic thru this switch. Yes.

[Leo Laohoo · Accepted solution]

the port remains in amber but a 'show interface' indicates that the interface is up.

Amber could mean a few things:

1.  Spanning-tree;

2.  Auto-negotiation between access and trunk port.

Can you please post the config of the 3750?  

If you'd like try the following command on each switches:

2960S

interface

switchport mode trunk

speed auto

duplex auto

3750

default interface

interface

switchport encapsulation dot

switchport mode trunk

speed auto

duplex auto

[glen.grant]

Can you post the 3750 side of the config , really nothing  that should make it not work if you are just running an access port to the 3750 .  I would think about changing that masking  and making it something smaller . 

[dasgill]

Thamk you everyone for your comments. Spaaning tree was puuting the uplink port in a blocking state. I disable spanning tree and the problem was resolved.

[glen.grant]

   I would say that was not a wise decision , spanning tree put that port in blocking mode for a reason , somewhere you have a built in loop in your design and you could put your net at risk by shutting off spanning tree between devices.