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pjoseph | 19 Jan 2007 10:10

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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dharam | 22 Feb 2007 13:01
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Re: Doubt on 802.1w (max age)


Hi There,

Just wanted to check which RSTP code you are using. Is it the RSTP LIB on
source forge . Was your testing successful ? 

Did you have to do any modifications to RSTPLIB so that it actually sends
out BPDUs or it sends it out anyways. 

Please email your response to dharam.jhatakia <at> gmail.com

pjoseph wrote:
> 
> 
> 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 )
> 
> 
>
(Continue reading)

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Mick Seaman | 19 Jan 2007 18:14
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Re: Doubt on 802.1w (max age)

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 -----
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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