subnet routes vs network-level routes

Answered Question
Mar 17th, 2010

Could someone please explain to me the difference between subnet routes and

network-level routes?

Thank you.

I have this problem too.
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Correct Answer by KARUPPUCHAMY MA... about 6 years 8 months ago

Hi,

Got your question.

when we are speaking about auto-summary, all the subnetted routes (subnetting  -- dividing the networks into multiple sub network's) will summarize into one single network route.

For example, In your routing table if you have multiple subnetted routes like 10.77.1.0/28,10.77.1.16/28,10.77.1.24/28 , then you can summarize into one single network route that 10.77.1.0/24.

Hope you got it.

Regards

Karuppu

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KARUPPUCHAMY MA... Wed, 03/17/2010 - 20:05

Hi,

Got confused about your question

Two kind of routes i can explain here.The first one is host based routes -- The network id which have a subnet of /32 [192.168.1.1/32] called host based routes.You can advertise these network id via both static and dynamic routing protocols

e.g ip route 192.168.1.1 255.255.255.255 10.1.1.1

The routes which is having less than /32 subnets are called as network based routes

Regards

Karuppu

lkadlik Wed, 03/17/2010 - 20:35

Thank you.  Maybe this would help. I was really trying to understand the auto-summary command .  It says "To allow automatic summarization of subnet routes into network-level routes"  I do not understand what the difference is.  Or maybe it is what the command really means I do not understand.

Correct Answer
KARUPPUCHAMY MA... Wed, 03/17/2010 - 20:40

Hi,

Got your question.

when we are speaking about auto-summary, all the subnetted routes (subnetting  -- dividing the networks into multiple sub network's) will summarize into one single network route.

For example, In your routing table if you have multiple subnetted routes like 10.77.1.0/28,10.77.1.16/28,10.77.1.24/28 , then you can summarize into one single network route that 10.77.1.0/24.

Hope you got it.

Regards

Karuppu

milan.kulik Thu, 03/18/2010 - 04:35

Yes,

but auto-summary would create 10.0.0.0/8 in your example, as 10.0.0.0 is a Class A IP network (see http://en.wikipedia.org/wiki/Classful_network ).

See also

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800a67f5.shtml

http://www.cisco.com/en/US/docs/ios/12_3t/ip_route/command/reference/ip2_a1gt.html#wp1069830

(notice the default value has changed - it's disabled by default since 12.2(8)T!)

BR,

Milan

Message was edited by: milan.kulik

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