On Fri, 23 Sep 2005 07:24:49 +0200, Fred Rabouw wrote:
> Did you check the speed and duplex settings of the running ports.
> Not those of the config file, but the real status.
> My first thing to check would be to see whether one port came up in
> duplex and the other in half duplex or so.
>
>
Good idea, but no, both sides are reporting:
Full-duplex, 1000Mb/s, media type is RJ45
>
>
> Aharon Schkolnik wrote:
>> Hi.
>>
>> I am having weird problems when I connect together three Catalyst 2950
>> switches. I want to use the two gigaethernet interfaces on the middle
>> switch to connect to two other 2950's using switchport mode trunk for VLAN
>> support. Whenever I do this I see CRC errors on the gigaethernet ports
>> (not a lot - about 1 error in 1000 packets). Also when I ping from a
>> machine on one switch to a machine on another switch I see a few percent
>> packet loss. It is not possible to sustain a remote desktop (terminal
>> services) connection from one switch to another. In addition I see an
>> extremely high number of input errors on the VLAN1 interface of the
>> switches (for example -232203 packets input, 60958 input errors).
>>
>> The cables I am using were manufactured by a very respected company, and I
>> have swapped cables multiple times. I have also completely
>> switched the middle switch. I have tried various combinations of
>> speed and duplex. Nothing helps.
>>
>> Any ideas, anyone ???
>>
>> TIA.
>>
>>
>> Here is a slightly edited version of my configurations:
>>
>>
>> !
>> version 12.1
>> no service pad
>> service timestamps debug uptime
>> service timestamps log uptime
>> no service password-encryption
>> !
>> hostname MiddleSwitch
>> !
>> !
>> ip subnet-zero
>> !
>> vtp mode transparent
>> !
>> spanning-tree mode pvst
>> no spanning-tree optimize bpdu transmission
>> spanning-tree extend system-id
>> !
>> !
>> !
>> !
>> vlan 2-3,11,301,901
>> !
>> interface FastEthernet0/1
>> switchport mode trunk
>> speed 100
>> duplex full
>> !
>> interface FastEthernet0/2
>> switchport mode trunk
>> speed 100
>> duplex full
>> !
>> interface FastEthernet0/3
>> switchport access vlan 3
>> spanning-tree portfast
>>
>>
>> interface GigabitEthernet0/1
>> switchport mode trunk
>> !
>> interface GigabitEthernet0/2
>> switchport mode trunk
>> load-interval 30
>> speed 1000
>> duplex full
>> !
>> interface Vlan1
>> ip address 172.16.253.1 255.255.0.0
>> no ip route-cache
>> !
>> ip default-gateway 172.16.0.1
>> ip http server
>> !
>> !
>> end
>>
>>
>> ================================================== =================
>>
>> version 12.1
>> no service pad
>> service timestamps debug uptime
>> service timestamps log uptime
>> no service password-encryption
>> !
>> hostname LowerSwitch
>> !
>> !
>> ip subnet-zero
>> !
>> vtp mode transparent
>> !
>> spanning-tree mode pvst
>> no spanning-tree optimize bpdu transmission
>> spanning-tree extend system-id
>> !
>> !
>>
>> ! Vlan 3 is for external IPs
>>
>> vlan 3
>>
>> !
>> !
>> interface FastEthernet0/1
>> spanning-tree portfast
>> speed 100
>> duplex full
>> !
>> !
>> interface FastEthernet0/23
>> switchport access vlan 3
>> spanning-tree portfast
>> speed 100
>> duplex full
>> !
>> interface FastEthernet0/24
>> switchport access vlan 3
>> spanning-tree portfast
>> speed 100
>> duplex full
>> !
>> interface GigabitEthernet0/1
>> switchport mode trunk
>> !
>> interface GigabitEthernet0/2
>> !
>> interface Vlan1
>> ip address 172.16.253.5 255.255.0.0
>> no ip route-cache
>> !
>> ip http server
>> !
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