Peter,
<Snipped to open points>
> Shouldn't each node in broadcast link originate LAN adj-SID and
> advertise label to all other nodes on the link?
For the adjacency to DR, Adj-SID Sub-TLV is used. For the adjacency to
non-DR LAN Adj-SID Sub-TLV is used. It's done all all nodes on the LAN.
<Shraddha> Is there a specific reason to advertise adj-sid for the DR and LAN
adj-sid for non-DR?
Is it because the Neighbor-ID is already part of Extended
link TLV and we are saving 4 bytes?
> I would think that we should have "route type" as in Extended prefix TLV
> instead of just having a bit indicating "inter area"
route-type would be misleading for range, as single range can include
prefixes of various types (intra, inter, external). We have discussed
this between authors and we agreed route-type is not the right way.
<Shraddha> The prefix range TLV is carried in Extended prefix LSA which is
based on scope of flooding.
If we combine intra/inter/external in the prefix range
TLV, what scope is used for flooding the extended prefix LSA?
Rgds
Shraddha
-----Original Message-----
From: Peter Psenak [mailto:[email protected]]
Sent: Tuesday, December 02, 2014 10:39 PM
To: Shraddha Hegde; [email protected]
Cc: OSPF WG List
Subject: Re: draft-ietf-ospf-segment-routing-extensions-03
Shraddha,
please see inline:
On 12/2/14 17:50 , Shraddha Hegde wrote:
> Authors,
> Some comments on the draft.
>
> 1. The draft refers to the various use cases in the use case document
> in I-D.filsfils-rtgwg-segment-routing. It's useful to mention the
> section of the use case draft which is applicable for each reference
> instead of giving generic reference.
sure, we can add that.
> 2. Section 7.2 LAN Adj-sid sub TLV:
>
> Based on the description of the text it appears that the LAN AdjSID
> Sub TLV can contain multiple neighbor-ID /SID pairs based on the nodes
> attached to a broadcast network. The TLV diagram should depict
> carrying multiple such pairs.
no. LAN AdjSID Sub TLV only advertises a adj-SID for a single neighbor.
If you have more non-DR neighbors, you need to advertise multiple LAN Adj-SID
Sub-TLVs.
> "It is used to advertise a SID/Label for an
> adjacency to a non-DR node on a broadcast or NBMA network."
> Does the above statement mean only DR originates the LAN-Adj SIDand
> advertises label to non-DR nodes?
no.
> Shouldn't each node in broadcast link originate LAN adj-SID and
> advertise label to all other nodes on the link?
For the adjacency to DR, Adj-SID Sub-TLV is used. For the adjacency to
non-DR LAN Adj-SID Sub-TLV is used. It's done all all nodes on the LAN.
>
> 3. Adj-Sid sub TLV section 7.1:
>
> Description of V-flag mentions Prefix-SID, it should be changed to Adj-SID.
good catch, will correct.
>
> 4. Section 4: Extended prefix range TLV is very similar to Extended
> prefix TLV just that it has additional range associated with it.
yes, that is correct.
>
> I would think that we should have "route type" as in Extended prefix TLV
> instead of just having a bit indicating "inter area"
route-type would be misleading for range, as single range can include
prefixes of various types (intra, inter, external). We have discussed
this between authors and we agreed route-type is not the right way.
thanks,
Peter
> Rgds
> Shraddha
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