From: Howard C. Berkowitz (hcb@gettcomm.com)
Date: Mon Jan 12 2004 - 15:25:46 GMT-3
At 11:41 AM -0600 1/12/04, Jaksec, Nick wrote:
>Lets just say I am going to inject 3 externals subnets rather adding them to
>an area via a network command. Is there any difference with creating a
>summary versus a external LSA?
Purely from the standpoint of an individual route computation, no.
But do remember that number of routes isn't the only criterion
affecting performance.
By not summarizing them, if any of the three go down, you get a
recomputation. If any flap, you get lots of recomputation.
Summarizing hides the flapping at the cost of creating blackholes.
>
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
>Jonathan Hays
>Sent: Monday, January 12, 2004 12:31 PM
>To: ccielab@groupstudy.com
>Subject: RE: OSPF LSA type 5
>
>
>you wrote:
>
>>I keep reading and hearing that you shouldn't inject LSA
>>type-5 into your
>>OSPF domain if you don't need to. Why not?
>
>= = =
>
>A lot depends on your topology, the size of your OSPF domain, the number
>of exits to the Internet, and so on.
>
>For example, suppose you had a small company network of less than 100
>routers and a single egress point to the Internet. There would be no
>point in injecting external LSAs into OSPF and filling up routing tables
>with unnecessary routes. A single default route pointing to the ASBR
>would suffice.
>
>The answer is, it depends.
>
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