[Bridge-mib] Re: Doubt on 802.1w (max age)
"Mick Seaman" <mick_seaman@ieee.org> Sat, 20 January 2007 10:01 UTC
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From: Mick Seaman <mick_seaman@ieee.org>
To: pjoseph@midascomm.com, stds-802-1@ieee.org, rstplib-users@lists.sourceforge.net, bridge-mib@ietf.org
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Subject: [Bridge-mib] Re: Doubt on 802.1w (max age)
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What I think about it is that you have Max Age set too low - I would suggest at least 8 in this scenario. The disputed procedure (I hope the code is to 1D-2004 with the two late editorial errors fixed as per the Vision sim release notes, alternately see 1Q-2005MSTP code which has these fixes) will stop there being a loop. Mick ----- Original Message ----- From: pjoseph@midascomm.com To: mick_seaman@ieee.org ; stds-802-1@ieee.org ; rstplib-users@lists.sourceforge.net ; bridge-mib@ietf.org Sent: Friday, January 19, 2007 1:10 AM Subject: Doubt on 802.1w (max age) Hi, Setup: 6 manageable switches are connected in linear fashion with root brdige at top . In the root bridge ,max-age ,hellotime and forward-delay is configured as 6 ,1 and 4 . Issue : In the sixth bridge ,learned value of max-age,hello time and forward delay is found as 6 ,1 and 4.But the role of the port connected to switch 6 alone is switching between F/R (Root) and F/D (Designated ) We r using the source forge rstp source code for all 6 switches From 802.1w standard,I calculated the rcvdinfowhile timer value for the port connected to sixth switch as 1 (Calculation done from updtRcvdInfoWhile()) .When port of switch 6 recieves BPDU for every hello time (1 sec) port role switches to F/R and on expiry of rcvdInfoWhile timer expiry ( 1 sec ) port role switches to F/D . What do you think about it ?
What I think about it is that you have Max Age set too low - I would suggest at least 8 in this scenario. The disputed procedure (I hope the code is to 1D-2004 with the two late editorial errors fixed as per the Vision sim release notes, alternately see 1Q-2005MSTP code which has these fixes) will stop there being a loop. Mick ----- Original Message ----- From: pjoseph@midascomm.com To: mick_seaman@ieee.org ; stds-802-1@ieee.org ; rstplib-users@lists.sourceforge.net ; bridge-mib@ietf.org Sent: Friday, January 19, 2007 1:10 AM Subject: Doubt on 802.1w (max age) Hi, Setup: 6 manageable switches are connected in linear fashion with root brdige at top . In the root bridge ,max-age ,hellotime and forward-delay is configured as 6 ,1 and 4 . Issue : In the sixth bridge ,learned value of max-age,hello time and forward delay is found as 6 ,1 and 4.But the role of the port connected to switch 6 alone is switching between F/R (Root) and F/D (Designated ) We r using the source forge rstp source code for all 6 switches From 802.1w standard,I calculated the rcvdinfowhile timer value for the port connected to sixth switch as 1 (Calculation done from updtRcvdInfoWhile()) .When port of switch 6 recieves BPDU for every hello time (1 sec) port role switches to F/R and on expiry of rcvdInfoWhile timer expiry ( 1 sec ) port role switches to F/D . What do you think about it ?
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