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TCP-group 1991


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RSPF routes that linger on



> all the routes were still there; very old but
> still there. ROUTE confirmed this and an RSPF STATUS showed all my
> adjacencies as TENTATIVE rather than BAD as I would have expected.

Interesting observation. When the suspect timer for an adjacency
expires, it goes from the OK state to SUSPECT. RSPF tries to ping the
adjacency a number of times as specified by the maxping command. If
the pings fail, the adjacency will enter the BAD state, where it will
remain for one supect-time interval until it is deleted from the
adjacency and routing tables.

Now suppose that you have more than 5 adjacencies. If you just unplug
your TNC, they might all become suspect within a short period of time.
RSPF imposes a limit on the number of processes it will create to ping
suspect adjacencies. This limit is defined by RSPF_PROCMAX which set
to 5. If an adjacency becomes suspect while there are already 5 other
adjacencies being pinged, it will not enter SUSPECT state but rather
the TENTATIVE state. And I forgot to reenable the timer in this
particular case, so the adjacency will remain in that state until
maybe you plug in the TNC again.
I guess this must be the problem you have experienced.

Anders





Document URL : http://www.a00.de/tcpgroup/1991/msg00024.php
Ralf D. Kloth, Ludwigsburg, DE (QRQ.software). < hostmaster at a00.de > [don't send spam]
Created 2004-12-21. Last modified 2004-12-21. Your visit 2020-10-27 15:51.21. Page created in 0.0493 sec.
 
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