[trill] [rbridge] Query on draft-ietf-trill-esadi-00

Abhinav Bhatia <nitks.abhinav@gmail.com> Fri, 13 July 2012 09:51 UTC

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Date: Fri, 13 Jul 2012 15:21:54 +0530
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From: Abhinav Bhatia <nitks.abhinav@gmail.com>
To: trill@ietf.org
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Subject: [trill] [rbridge] Query on draft-ietf-trill-esadi-00
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Hi Authors,



I have query regarding  “The ESADI (End Station Address Distribution
Information) Protocol” as per  “draft-ietf-trill-esadi-00”



According to draft in Section
5.2<http://tools.ietf.org/html/draft-ietf-trill-esadi-00#section-5.2>Forgetting
End Station Addresses



   If RBridge RBn participating in the TRILL ESADI protocol for VLAN-x

   is no longer appointed forwarder for VLAN-x on any port where it is

   providing end station service, it ceases to participate in ESADI

   after sending a final ESADI-LSP nulling out its ESADI-LSP

   information.



Above will remove/flush the learned L2 entries for that ESADI Rbridge for
that vlan and also remove the neighbor ESADI instance entry.



Q) What does “nulling out” its ESADI-LSP information mean? Does it means
removing the macs and sending an empty MAC Reachability TLV or does it mean
that the ESADI LSP

     wont contain any MAC Reachability TLV at all?



Q) In case if ESADI rbridge is AF for a vlan-x and  the only  End Station
which was connected earlier, is removed now, then what will be sent in
ESADI-LSP to flush L2 entries for that

    vlan-x, will it be without MAC Reachability TLV? Please bear in mind
that the RBridge has not lost AF for that particular vlan, but has no End
Station to send in MAC Reachability

    TLV.



    Please let me know for an ESADI RBridge  how to distinguish between

1>     when to remove learned L2 entries and

2>     when to remove ESADI instance neighbor on receiving ESADI-LSP?

Thanks,

Abhinav