I have a Cisco model 3550 layer 3 switch. I am presently only using the
default VLAN1. I have addressed the vlan1 interface with the IP,
> 170.88.231.39/24. I am trying to expand this subnet to include another > 255 IP's.
>
> I am dong this by using the network address, 170.88.230.0/23 which would
> include all 230.x and 231.x addresses. The only change I made to the
> 3550 is to change the existing mask on the VLAN1 interface to
> 255.255.254.0 using the same IP address stated above. All network
> devices whether they have a 230.x or a 231.x IP, all have the 23 bit > mask.
>
>
>
> These are my symptoms:
>
>
>
> If I have devices with a 170.88.230.x address, they will drop
> connections to those devices with a 170.88.231.x address, and vice
> versa. These connections will randomly reconnect and disconnect
> whenever. This symtom renders my LAN inoperable as it causes very high
> utilization on the 3550's cpu. As long as the 230.x's are talking to
> 230.x's and the 231.x's are talking to 231.x's everything is fine. They
> just won't stay connected to each other.
>
>
>
> Any thoughts or ideas would be appreciated.
>
>
>
> Thanks,
>
>
>
> Steve
>
>
>
>