[rbridge] scope of draft-tissa-trill-cmt-00
"Tissa Senevirathne (tsenevir)" <tsenevir@cisco.com> Thu, 29 March 2012 12:05 UTC
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Thread-Topic: scope of draft-tissa-trill-cmt-00
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From: "Tissa Senevirathne (tsenevir)" <tsenevir@cisco.com>
To: rbridge@postel.org
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Subject: [rbridge] scope of draft-tissa-trill-cmt-00
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There is considerable discussion going on in the mailing list, it
appears may be the scope of the work in the draft need bit more
explanation. Hence, thought to give a background and scope of the draft
and exact problem that we are solving
1. This draft is only focusing on how to solve RPF issue on the
multi-homed edge that use pt-pt links.
2. This draft does not discuss how multi-homed edge should be
implemented, it is work of future drafts.
Below is an example on how this problem can occur.
Assume there is dual homed pt-pt Edge and edge is represented by virtual
nickname
Assume there are two multi-destination trees.
Consider the following cases
case 1: Both trees are rooted on the same RBRidge RBx
Case 2 Two trees are rooted on different RBridges RBx and RBy
Consider the topology below. In an scenario like below, virtual RB will
always be connected to the two trees through RB1, hence RB2 is unable to
associate Virtual RB to a tree.
The CMT draft provide flexible framework to associate virtual RB to
multi-destination trees through a parent of choice.
Case 1:
Rbx
| \ (10)
(1)| \---------
| |
RB1 ----(1)---- RB2
+---------------+
| Virtual RB |
Case 2:
Rbx Rby
(1) | | (1)
+----------------------+
| TRILL Campus |
+----------------------+
| \ (10)
(1)| \---------
| |
RB1 ---(1)------ RB2
+---------------+
| Virtuak RB|
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- [rbridge] scope of draft-tissa-trill-cmt-00 Tissa Senevirathne (tsenevir)