Expandin Subnet on Cisco 3550 Layer 3 Switch

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





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