Kotesh,
On 19/03/2024 12:44, Kotesh Chundu wrote:
Hi,
I have one query regarding the following content from the IGP UPA draft.
<snip>
As UPA advertisements in IS-IS are advertised in existing Link State
PDUs (LSPs) and the unit of flooding in IS-IS is an LSP,*it is recommended that, when possible, UPAs are advertised in LSPs
dedicated to this type of advertisement. This will minimize the number
of LSPs which need to be updated when UPAs are advertised and withdrawn.*
</snip>
What is meant by LSPs dedicated to this type of advertisement in the
above highlighted text? My understanding is that we have only one ISIS
LSP for all the content. If a given LSP can not fit into one packet,
then it is put into multiple fragments.
a node can generate up to 255 LSPs in the L1 area, or in L2 backbone.
Sometimes these are referred to as fragments, but these are independent
LSPs.
Does it refer to some enhancement where UPA prefixes are separately
put into separate ISIS fragments dedicated for UPA prefixes? Or any
other enhancement where we define a separate LSP type for UPA? Can
somebody clarify this?
the recommendation is that UPAs may be sent in a separate LSP, because
they are short lived. This avoids the receiving nodes to go over the
unchanged content of the LSP, if UPAs are mixed with other information.
Note that it is an optional behavior and is not needed for the UPA
functionality.
thanks,
Peter
Does any vendor support this kind of enhancement for UPA or any other
ISIS feature?
Regards,
Kotesh
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