Removed 2 static routes in favour of one Summarized Route

[Iziren Okhamafe]

Hello, greetings fellow Wouldbe Network Admins/Engineeers/actual Network Engineers.  I have a brief question for you guys. It's rather simple. 

In my IPv4 scheme on a particular router, I had 2 static routes, I removed them in favour of just 1 summarized static route as follows:

WEST(config)#no ip route 172.16.32.0 255.255.248.0 10.10.10.5
WEST(config)#no ip route 172.16.48.0 255.255.248.0 10.10.10.5
WEST(config)#ip route 172.16.32.0 255.255.224.0 10.10.10.5

Wouldn't that be he correct summarized static route? The 172.16.32.0/19 ?

Was there anything I miss-configured there? Thanks!

[Leo Laohoo]

Duplicate posts.  

Go here:  http://supportforums.cisco.com/discussion/12156551/removed-2-static-routes-favour-one-summarized-route

[Jon Marshall]

Leo

Sorry, i was posting while you did that

Jon

[Jon Marshall]

Yes your summary route covers those ranges but it also covers more ie.

172.16.32.0 255.255..248.0 goes up to 172.16.39.255

172.16.48.0 255.255..248.0 goes up to 172.16.63.255

whereas your summary -

172.16.32.0 255.255.224.0 goes up to 172.16.63.255

so you have also included - 

172.16.40.0 -> 172.16.47.255

which your original routes didn't cover.

This may or may not be an issue depending on your setup.

Jon