Re: [rbridge] query regd. TRILL scenario
Donald Eastlake <d3e3e3@gmail.com> Sat, 07 January 2012 03:26 UTC
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From: Donald Eastlake <d3e3e3@gmail.com>
Date: Fri, 06 Jan 2012 22:05:56 -0500
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To: Joydeb Roy <joydeb@gmail.com>
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Subject: Re: [rbridge] query regd. TRILL scenario
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Hi Joydeb, On Tue, Jan 3, 2012 at 1:51 AM, Joydeb Roy <joydeb@gmail.com> wrote: > Hi Donald, > > Thanks a lot for your reply. The understanding is indeed much better now. > Just another query though regarding the AVF part you mentioned in your > comments - > > Now, I understand that the default the DRB will carry all the traffic to and > fro the end-user. But when the DRB does decide to distribute the traffic to > other rbridges then what propels it to make that decision? > > The last sentence of the Section 2.2 from the RFC 6439 states - > > "How the DRB decides what other RBridges on the link, if any, to appoint > forwarder for which VLANs is beyond the scope of this document." > > So, is there any other standard document that I can refer to? Is the > behavior totally dynamic in nature e.g. the DRB takes such decision through > the usage of some algorithm? Or should it be configurable, so that the > Network Admin takes the last call? I kind of think of how the DRB decides what forwarders to appoint as an area where implementors can display their individual brilliance :-) Seriously, there are a lot of factors that could be used in such decisions. I don't see how it could be standardized. But you might look at draft-zhang-trill-vlan-assign-02.txt and at Section 10.2 of draft-eastlake-trill-rbridge-clear-correct-02.txt. By the way, in connection with your previous question, you might look at Section 6 of draft-eastlake-trill-rbridge-clear-correct-02.txt. Thanks, Donald ============================= Donald E. Eastlake 3rd +1-508-333-2270 (cell) 155 Beaver Street, Milford, MA 01757 USA d3e3e3@gmail.com > Thank you. > Best regards > Joy > > On Mon, Jan 2, 2012 at 7:51 PM, Donald Eastlake <d3e3e3@gmail.com> wrote: >> >> Hi Joybed, >> >> On Mon, Jan 2, 2012 at 5:06 AM, Joydeb Roy <joydeb@gmail.com> wrote: >> > Hi Authors, >> > >> > Please let me know if my understanding is proper in the below case. If >> > yes, >> > then please clarify the doubts and if no, then please correct wherever >> > applicable. >> > >> > Generally, RBridges learn about end stations on access ports and they >> > communicate with each other to form adjacency through trunk ports. But >> > if >> > we consider the following diagram – >> >> TRILL tries to be zero/minimum configuration. So by default, RBridge >> ports are universal ports that can handle both native and TRILL Data >> frames. RBridge access and trunk ports are ports that have been >> configured to restrict them. While this is commonly a good idea, it is >> not necessary for correct operation. >> >> In any case, TRILL Hellos are always sent out RBridge ports unless the >> port is disabled or configured as point-to-point (in which case >> point-to-point Hellos get sent on them). >> >> > +---------+ >> > +---------+ | RB1 | >> > | End | +-----+ ------ +---------+ >> > | | ------ | Hub | >> > | Station | +-----+ ------ +---------+ >> > +---------+ | RB2 | >> > +---------+ >> > >> > How do the involved ports in RB1 and RB2 behave in this case? Do both of >> > them manage to learn about the End Station and one of them becomes the >> > DRB >> > based upon the configured priorities? Also, do they manage to form an >> > adjacency between them? If so, then how do they manage so in spite of >> > the >> > ports being designated as access? >> >> As above, TRILL Hellos are still sent out the ports of RB1 & RB2 >> whether or not the "access port" configuration bit has been turned on >> for those ports. So they form an adjacency and one is elected DRB on >> the link. By default, the DRB will handle all the native traffic >> to/from the End Station. The other RBridge will see all that traffic >> but will throw it away because by default it is not the Appointed >> Forwarder for any VLAN on the link. However, the DRB can assign some >> or all VLANs to the non-DRB RBridge as Appointed Forwarder. >> >> > Thank you. >> > >> > Best regards >> > Joy >> >> Hope the above helps. >> >> Thanks, >> Donald >> ============================= >> Donald E. Eastlake 3rd +1-508-333-2270 (cell) >> 155 Beaver Street, Milford, MA 01757 USA >> d3e3e3@gmail.com > > _______________________________________________ rbridge mailing list rbridge@postel.org http://mailman.postel.org/mailman/listinfo/rbridge
- [rbridge] query regd. TRILL scenario Joydeb Roy
- Re: [rbridge] query regd. TRILL scenario Donald Eastlake
- Re: [rbridge] query regd. TRILL scenario Joydeb Roy
- Re: [rbridge] query regd. TRILL scenario Donald Eastlake