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<DIV dir=ltr align=left><SPAN class=687032700-17092007><FONT face=Arial
color=#0000ff size=2>I believe that if any of STP, RSTP, or MSTP is enabled on a
port, then BPDUs will be sent periodically regardless of whether any BPDUs are
being received.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=687032700-17092007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=687032700-17092007><FONT face=Arial
color=#0000ff size=2>Donald</FONT></SPAN></DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> Amit Gupta [mailto:Amit.Gupta@calix.com]
<BR><B>Sent:</B> Thursday, August 23, 2007 11:28 PM<BR><B>To:</B> Eastlake III
Donald-LDE008<BR><B>Cc:</B> rbridge@postel.org<BR><B>Subject:</B> RE: [rbridge]
RSTP BRIDGE not receiving BPDUs<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV id=idOWAReplyText86668 dir=ltr>
<DIV dir=ltr><FONT face=Arial color=#000000 size=2>The scenario here is that
the2 bridges are connected in a ring topology with eaps providing the ring
protection while RSTP is providing the uplink/downlink protection. The reason
the other port is not receiving the BPDU is because the EAPS is blocking one of
the links to avoid loops in the ring.Thus even though the each bridge has 2
paths 2 reach the other but at any given time will only be able to receive BPDU
from the path that is not blocked by EAPS. so thats why I was wondering what
state/role would be the port that is not receiving the BPDU. </FONT></DIV>
<DIV dir=ltr><FONT face=Arial size=2>Will it keep sending the Hello BPDU even
though it is not receiving any ?</FONT></DIV>
<DIV dir=ltr> </DIV></DIV>
<DIV dir=ltr><BR>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> Eastlake III Donald-LDE008
[mailto:Donald.Eastlake@motorola.com]<BR><B>Sent:</B> Thu 8/23/2007 6:28
PM<BR><B>To:</B> Amit Gupta<BR><B>Cc:</B> rbridge@postel.org<BR><B>Subject:</B>
RE: [rbridge] RSTP BRIDGE not receiving BPDUs<BR></FONT><BR></DIV>
<DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=965551701-24082007>Well, I'm sure there are people on this list who could
help you but this is really not the 802.1 mailing list, which would seem more
appropriate.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=965551701-24082007></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=965551701-24082007>It is a generally characteristic of STP protocols that
the loss of frames leads to ports becoming enabled. So, while I am not an RSTP
expert, I would guess that in the normal case the port not receiving BPDUs would
end up in Forwarding state and would believe itself to be root unless their is a
better root visible out some other port...</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial size=2><SPAN
class=965551701-24082007></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=965551701-24082007>But I could be wrong and maybe I am misunderstanding
you.... I am assuming you mean "2 bridges are interconnected and of the 2 ports
only 1 port on *one* bridge is receiving BPDU’s" but in your statement in the
message below, you say "each" rather than "one" which seems
inconsistent.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=965551701-24082007></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=965551701-24082007>On wonders what is blocking the BPDUs and why the one
hop physical link between the bridges is letting BPDUs through in only on
direction and not the other...</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=965551701-24082007></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=965551701-24082007>Donald</SPAN></FONT></DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> rbridge-bounces@postel.org
[mailto:rbridge-bounces@postel.org] <B>On Behalf Of </B>Amit
Gupta<BR><B>Sent:</B> Thursday, August 23, 2007 8:21 PM<BR><B>To:</B>
rbridge@postel.org<BR><B>Subject:</B> Re: [rbridge] RSTP BRIDGE not receiving
BPDUs<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">It is a very basic
question. </SPAN></FONT><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">What would be the state and role of
a port if you stop receiving the RSTP BPDU’s on that bridge
port.</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">If 2 bridges are interconnected and
of the 2 ports only 1 port on each bridge is receiving BPDU’s , will that cause
any issues ?</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Thanks,</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">-A</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </P></DIV></DIV></BODY></HTML>