Cisoc 2900 switch problem

[tming]

I have a cisco 2900 switch.
One of the post led in a blink amber state.
I have check the port status by sh int fa 0/?, no error was found.
What may cause the problem.

A situation is
internet - firewall - SwitchA - SwitchB - SwitchC

When a pcA connect to SwitchA ping a PC in SwitchB and SwitchC
The ping result is time out or connected alternatively.
Ping between SwitchB to SwitchC is OK
If i connect a pcB to SwitchA(use the port connected to SwitchB) to ping pcA, the connection is OK.
Is it possible that there are many traffic accross the SwitchA to from SwitchB and SwitchC to firewall.

 

[lambent]

..

Same VLAN on switch A B C?
What's the default gateways on your PCs?
Can you post the show int f0/? output that has the blinking amber state?

 

[rainman]

tming -

On your c29xx do a "show post" to see if any of your switchports failed the POST test upon bootup.

Another possibility is that the port is greened up @ 10mb/s instead of 100. On your "show interface x/y" check your speed if it's forced to 10, or set to auto and make sure your NIC supports 10/100 if thats what your plans are.

There is no layer 3 IP configuration problem that could cause the port to be amber. Amber is either 10mb/s or even a failed port. A few years ago I had an odd issue with a c2900 and the port showed up OK but it kept blinking amber, so I wiped the startup-config off the switch, rebooted it, and the port was fine (I did the "show post" previously and there was no problem so i deleted the config and it worked).

Just a thought.


-Rainman

 

[jneiberger]

Depending on the model, an amber light might indicate that the port has moved into a spanning tree blocking state. I had that happen today, as a matter of fact, when I misconfigured a switch-to-switch connection.

 

[tming]

Thanks for all.

Switch A, B, C are on the same VLAN.
Actually, all the switchs do not have any configuration(default).
The default gateway is point to the internal firwall interface of the PC.

When i press the mode button on the switch panel. It shows full duplex and 100 speed. The "sh int" show the speed auto 100.

SwitchB is a 3Com switch that without any features.
Would it causes the amber port in SwitchA.

 

[NetworkGhost]

Any redundant links ? Does sound like a Spanning tree problem. Check on both Switch B on the port that is amber and the directly connected switch to see if the interface itself is in a blocking state. Do you plan to trunk these ports? I would figure out whther they are going to be trunked or kept as strictly access ports. That way they arent trying to autonegotiate trunk if by default thats what they are doing. No to sure about the 3COM.

 

[Ste1234567]

You need to set the port on the cisco that is cascaded with the 3com as a "default" port and not a desktop port. On my 2950's I do this through the web interface (make sure the port is marked as a grey square and not with a picture of a PC on it)

 

[tming]

The following is the "sh port" result:

FastEthernet0/2 is up, line protocol is up
Hardware is Fast Ethernet, address is 0050.53f4.2382 (bia 0050.53f4.2382)
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, rely 255/255, load 1/255
Encapsulation ARPA, loopback not set, keepalive not set
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:16, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 12000 bits/sec, 15 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
264097 packets input, 28152989 bytes, 0 no buffer
Received 263136 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 watchdog, 121525 multicast
0 input packets with dribble condition detected
2147 packets output, 348207 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out

No reduntant link.
Not planning to make any configuration

 

[NetworkGhost]

Can you post your config?

 

[tming]

This is the "sh run" config

Building configuration...

Current configuration:
!
version 11.2
no service pad
no service udp-small-servers
no service tcp-small-servers
!
hostname dgcsw1
!
enable secret 5 $1$q2Q5$GFw9B4RtxDUfaNV.weBdG0
enable password
!
!
!
interface VLAN1
ip address 200.1.4.253 255.255.255.0
no ip route-cache
!
interface FastEthernet0/1
!
interface FastEthernet0/2
!
interface FastEthernet0/3
!
interface FastEthernet0/4
!
interface FastEthernet0/5
!
interface FastEthernet0/6
!
interface FastEthernet0/7
!
interface FastEthernet0/8
!
interface FastEthernet0/9
!
interface FastEthernet0/10
!
interface FastEthernet0/11
!
interface FastEthernet0/12
!
interface FastEthernet0/13
!
interface FastEthernet0/14
!
interface FastEthernet0/15
!
interface FastEthernet0/16
!
interface FastEthernet0/17
!
interface FastEthernet0/18
!
interface FastEthernet0/19
!
interface FastEthernet0/20
!
interface FastEthernet0/21
!
interface FastEthernet0/22
!
interface FastEthernet0/23
!
interface FastEthernet0/24
!
snmp-server community private RW
snmp-server community public RO
snmp-server chassis-id ciscosw3
!
line con 0
exec-timeout 0 0
password
login
stopbits 1
line vty 0 4
password
login
line vty 5 14
password
login
!
end