Re: DNA LSA ( Do Not Age LSA)

From my understanding since a VL is treated like a Demand Circuit the DNA
bit is set to not refresh the LSA every interval.

On Thu, Nov 5, 2009 at 7:17 PM, Ramanpreet Singh
<sikandar.raman_at_gmail.com>wrote:

> Experts,
>
> Why does LSA's learned from virtual-link have DNA option set? Can
> anyone explain more about DNA (DoNotAge) option?
>
> Documentation talks about Flooding reduction but I am not 100% sure
> about this concept.
>
> Here is the output from show ip ospf databass. 3.3.3.3 and 4.4.4.4
> have virtual-links.
>
> Router Link States (Area 0)
>
> Link ID ADV Router Age Seq# Checksum Link count
> 1.1.1.1 1.1.1.1 75 0x80000008 0x0067E2 3
> 2.2.2.2 2.2.2.2 157 0x8000000D 0x006E63 3
> 3.3.3.3 3.3.3.3 2 (DNA) 0x80000007 0x00BC57 2
> 4.4.4.4 4.4.4.4 3 (DNA) 0x80000002 0x002171 1
>
> Summary Net Link States (Area 0)
>
> Link ID ADV Router Age Seq# Checksum
> 2.2.2.2 2.2.2.2 416 0x80000003 0x00F633
> 2.2.2.2 3.3.3.3 7 (DNA) 0x80000001 0x005F88
> 3.3.3.0 3.3.3.3 7 (DNA) 0x80000001 0x00CC5A
> 3.3.3.0 4.4.4.4 8 (DNA) 0x80000001 0x0031B1
> 4.4.4.0 4.4.4.4 8 (DNA) 0x80000001 0x008A95
> 5.5.5.0 4.4.4.4 8 (DNA) 0x80000001 0x00E8F3
> 10.1.23.0 2.2.2.2 416 0x80000003 0x003F91
> 10.1.23.0 3.3.3.3 7 (DNA) 0x80000001 0x0025A9
> 10.1.34.0 3.3.3.3 7 (DNA) 0x80000001 0x00AB18
> 10.1.34.0 4.4.4.4 8 (DNA) 0x80000001 0x008D32
> 10.1.45.0 4.4.4.4 8 (DNA) 0x80000001 0x0014A0
>
>
> Thanks,
> Raman
>
>
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Received on Thu Nov 05 2009 - 19:21:37 ART