How to Suppress BPDU on cat5k (4.5(4)?

Unanswered Question
Sep 25th, 2007

WS-C5000 Software, Version McpSW: 4.5(4) NmpSW: 4.5(4)....


I am using above switch in my network and i have to suppress BPDU in it. I have been looking at some docs at Cisco site about STP related info. I have sc0 port is coonected to root switch with provide me my Subnet connection. How can i Suppress BPDU?

I have this problem too.
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tpacjer Fri, 09/28/2007 - 11:05


set spantree bpdu-guard x/x-x enable

set spantree bpdu-filter x/x-x enable

aggie1234 Fri, 09/28/2007 - 11:09

I manage to do that but below problem happen:

I have turned STP off on vlan 1(default) and connected uplink from root switch. Which work for vlan 1 (port 1/1 and 2/1-12) ports? I put UNIX box and works well with vlan1.

I have created another vlan and turned off STP. I have moved 1/1 and 2/1-12 ports to this new vlan. I moved my uplink to this new vlan and found no connectivity and I lost my uplink to my root switch. If I move this to vlan 1, it starts working. I don?t understand why it happening. Am I missing something when I created new vlan?

aggie1234 Fri, 09/28/2007 - 11:38

I was looking at config Valn trunk doc for cat os 4.5(4).

I see only Vlan 1 in

Port Vlans allowed and active in management domain

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

1/1 1

Please let me know how to add another Vlan to trunk... thx....

aggie1234 Fri, 09/28/2007 - 11:50

I found that feature is not supported on my module...

set trunk 2/1 auto 76 isl

Feature not supported on Module 2.

tpacjer Fri, 09/28/2007 - 11:53

is this the core? if so you would put it on 15/1 other wise you would add the trunk to your uplink

aggie1234 Fri, 09/28/2007 - 11:58

I am soory, i didn't get it.. please let me know what do you mean? about core and 15/1


Francois Tallet Fri, 09/28/2007 - 12:04

Not sure I'm understanding the problem you described as no connectivity. If it's a connectivity to and from this switch, it might be that you have to move int sc0 to the new vlan.



aggie1234 Fri, 09/28/2007 - 12:16

first, let me thank you all for your help.

My question is ... I want to set vlan in my switch for my uplink from root switch.

1) 199.x.76 is my uplink from root switch. I can't send BPDU to my root switch.

Vlan 1 is default and port 1/1 and 2/1-12 was assigned to it. I have connected my uplinl to 1/1 and a sun box at 2/1 with ip 199.x.76.10.

This setup work and i ping my gateway and my sun box.

2) I want create vlan 76 and i did that and assigned port 1/1 and 2/1-12 to this new vlan. This time i can't ping my gateway and my sun box.

3) set trunk command doesn't supported on my second (2) module...which is WS-x5224. I am not sure what do i need to do to create new vlan.

Q. why my new vlan doesn't working?


glen.grant Fri, 09/28/2007 - 17:19

Do the following and see what happens. Not sure why you think you have to turn off spanning tree when you are connecting to another switch , not good practice . If you are going to try and manage the 5000 then you have to change the SC0 interface to the address range of the uplink going to the root switch , if thats vlan 76 also , add third statement.

"set vlan 76 state active"

set vlan 76 1/1,2/1-12

set int sc0 76

set ip route default .

aggie1234 Mon, 10/01/2007 - 10:40

I have tried it and ...

I have configured, according your commands and made progress. I did put 1/1 and 2/1-12 in vlan 76. my uplink was connected to 1/1 and my sun box at 2/3. In this setup i could ping my internal but not my gateway IP (199.X.76.1). I moved my up link to 2/1 and sun at 2/3 and it start working. Why it didn't work when my link was connected to 1/1?

1/1 and 1/2 are fiber connection and 1/1 is connected by media converter. Do i need to do some special at port 1/1? I am seeing bellow error 'at sh port 1/1' output.

Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize

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

1/1 162074 127485 0 51949 7





How can i clear this info?

How can i create another Vlan?

My original setup is for 2 uplink from root switch for two valn. now i have vlan 76 and need to add vlan 81 with ports 1/2 and 3/1-12.

{My probelm was sc0 was configured for vlan 1. with your comand i changed to vlan 76.}

Thanks for all help.


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