C3550 Vlan issue?

[adam.strobel]

I have eight C3550 switches connected to a C6509 (gig ports). About every 5 days the C3550 switches have very spotty pings to the VLAN 102 segment and basically all the PC's connected to those switches loose network access to VLAN 102. It seems when this issue happens I can ping the Vlan 100 just fine from the C3550's.

Also the 6509 Cannot ping the vlan 102 when this issue happens even if the server sits on the 6509.

any suggestions?

[Georg Pauwen]

Hello,

if this happens at regular intervals (every 5 days, as you mentioned), some sort of spanning tree convergence could be causing this behaviour. Can you see any increased (error) counters on the Gigagbit (trunk) interfaces when this occurs ? Also, can you post the configuration of the 6509, as well as one of the 3550 switches ? Which (IOS or CatOS) version are you running on the 6509 ?

Regards,

GP

[adam.strobel]

I'm not seeing any increased error counters on the Gigabit truck interface. the 6509 is running Version 12.2(17a)SX1 and the 3550's are running (C3550-IPBASE-M), Version 12.2(25)SEB2

thanks!!!! Adam

Here is the 3550 config,

Password:

Password:

6509>en

Password:

6509#shwo ru ow run

Building configuration...

Current configuration : 27499 bytes

!

! Last configuration change at 08:06:06 EST Sat Jun 18 2005

! NVRAM config last updated at 07:53:44 EST Sat Jun 18 2005

!

here is the 3550 config,

show run

Building configuration...

Current configuration : 7124 bytes

!

! No configuration change since last restart

!

version 12.2

no service pad

service timestamps debug uptime

service timestamps log uptime

service password-encryption

!

hostname upstairs_10.175.102.8

!

logging console critical

logging monitor critical

enable secret 5

!

no aaa new-model

clock timezone EST -5

ip subnet-zero

ip domain-name xxxxxx

ip name-server 10.175.102.16

ip name-server 10.175.102.17

--More-- !

no file verify auto

spanning-tree mode pvst

spanning-tree extend system-id

vlan internal allocation policy ascending

!

interface FastEthernet0/1

switchport access vlan 102

switchport mode access

spanning-tree portfast

!

interface FastEthernet0/47

switchport access vlan 102

switchport mode access

spanning-tree portfast

!

interface FastEthernet0/48

switchport access vlan 102

switchport mode access

--More-- duplex full

spanning-tree portfast

!

interface GigabitEthernet0/1

switchport access vlan 102

switchport mode access

!

interface GigabitEthernet0/2

switchport mode dynamic desirable

!

interface Vlan1

no ip address

shutdown

!

interface Vlan102

ip address 10.175.102.8 255.255.255.0

!

ip default-gateway 10.175.102.1

ip classless

ip http server

!

logging trap notifications

logging 10.175.100.71

--More-- snmp-server community xxxxxx RW

snmp-server enable traps snmp authentication linkdown linkup coldstart warmstart

snmp-server enable traps tty

snmp-server enable traps cluster

snmp-server enable traps entity

snmp-server enable traps envmon

snmp-server enable traps cpu threshold

snmp-server enable traps vtp

snmp-server enable traps vlancreate

snmp-server enable traps vlandelete

snmp-server enable traps flash insertion removal

snmp-server enable traps port-security

snmp-server enable traps MAC-Notification

snmp-server enable traps copy-config

snmp-server enable traps config

snmp-server enable traps hsrp

snmp-server enable traps rtr

snmp-server enable traps bridge newroot topologychange

snmp-server enable traps stpx inconsistency root-inconsistency loop-inconsistency

snmp-server enable traps syslog

snmp-server enable traps vlan-membership

!

--More-- control-plane

!

!

line con 0

password 7

login

line vty 0 4

password 7

login

line vty 5 15

password 7

login

!

ntp clock-period 17180206

ntp server 128.10.252.10

!

end

upstairs_10.175.102.8#

[adam.strobel]

my 6509 config is too big, can I email it to you?

thanks,

Adam