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Posted by Fred Rabouw on September 23, 2005, 7:24 am
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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.
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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