Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

Redesigning IP Addressing on live network

Hi,

I have a task to re-design IP addressing for 2 sites. Have these doubts,

1. At one site we are extending hosts by changing the mask from /24 to /23 for class A ip adress.

What all things i need to keep in mind when i change the mask on the router, then switch, then servers?

Will there be any kind of service disruption?

2. I will need to add a new subnet range at another site and remove the current subnet range after a month. This is also class A. Shall I plan to put the new subnet as secondary IP range or primary IP range or vice versa?

The old subnet will be taken to another site later.

ip address 10.xxx.xx.xx /23 primary

ip address 10.vvv.vv.vv /23 secondary

thanks

1 REPLY
Hall of Fame Super Silver

Re: Redesigning IP Addressing on live network

Hello Srinath,

1) when you change a subnet mask you cause service disruption for sure so you should consider to add the second network in a separate vlan as a /24 (preferred) or as secondary address (if your site cannot support multiple Vlans only in this case)

2) in this case using primary/secondary addresses in the same vlan helps to have a smooth migration.

If using DHCP you need to create a scope for new subnet

Hope to help

Giuseppe

112
Views
0
Helpful
1
Replies