Veerendranath,
please see inline:
On 29/11/16 03:06 , Veerendranatha Reddy Vallem wrote:
Dear Authors,
As per draft, for LAN SID Sub-TLV,
7.2. LAN Adj-SID Sub-TLV
The LAN Adj-SID is an optional Sub-TLV of the Router-Link TLV. It
MAY appear multiple times in the Router-Link TLV. *It is used to*
* advertise a SID/Label for an adjacency to a non-DR neighbor on a*
* broadcast or NBMA network.*
**
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Flags | Weight | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Neighbor ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SID/Label/Index (variable) |
+---------------------------------------------------------------+
**
“LAN SID is used for non-DR neighbors.” We cannot use this Sub TLV to
provide SID for DR router (Neighbor ID is DR’s router id in this TLV) ?
No.
It means we need to include “Adj_SID Sub TLV for DR neighbor” and LAN
Adj-SID for other neighbors (including BDR) in the network while
advertising Adj- SID in Router Link TLV for LAN?
yes, that is correct.
8.4.2. Adjacency SID on Broadcast or NBMA Interfaces
Broadcast or NBMA networks in OSPFv3 are represented by a star
topology where the Designated Router (DR) is the central point to
which all other routers on the broadcast or NBMA network connect. As
a result, routers on the broadcast or NBMA network advertise only
their adjacency to the DR. Routers that do not act as DR do not form
or advertise adjacencies with each other. They do, however, maintain
a 2-Way adjacency state with each other and are directly reachable.
Psenak, et al. Expires May 1, 2017 [Page 31]
Internet-Draft OSPFv3 Extensions for Segment Routing October 2016
When Segment Routing is used, each router on the broadcast or NBMA
network MAY advertise the Adj-SID for its adjacency to the DR using
Adj-SID Sub-TLV as described in Section 7.1.
SR capable routers MAY also advertise an Adj-SID for other neighbors
(e.g. BDR, DR-OTHER) on the broadcast or NBMA network using the LAN
ADJ-SID Sub-TLV as described in Section 7.2.
thanks,
Peter
Can you please provide clarity for this sub TLV.
Regards,
Veerendranath
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