RE: [pim] Question about PIM Trap pimNeighborLoss

["Raghava Sivaramu" <raghava at cisco.com>]

> -----Original Message-----
> From: Xiangrong Cai [mailto:kcai at nortel.com] 
> Sent: Wednesday, April 26, 2006 3:32 PM
> To: pim at ietf.org
> Subject: [pim] Question about PIM Trap pimNeighborLoss 
> 
> In PIM MIB RFC2934, PIM Traps section, there is this 
> pimNeighborLoss trap:
> 
> ======================================================
> -- PIM Traps   
> 
> pimNeighborLoss NOTIFICATION-TYPE
>     OBJECTS {
>        pimNeighborIfIndex
>     }
>     STATUS             current
>     DESCRIPTION
>             "A pimNeighborLoss trap signifies the loss of an adjacency
>             with a neighbor.  This trap should be generated when the
>             neighbor timer expires, and the router has no other
>             neighbors on the same interface with a lower IP 
> address than
>             itself."
>     ::= { pimTraps 1 }
> =======================================================
> 
> Can somebody tell me why this trap needs to be raised? From 
> the text, it seems to me that if I have the lowest ip (either 
> because I had and still have or because the dead one is the 
> only one that had lower ip than I do), and I detected a 
> neighbor loss, then I should raise this trap. Why this way? 
> To me the only place that deal with neighbor IP address in 
> PIM is DR election, but DR election involves with Priority 
> also, and if priority is the same, the highest ip, not the 
> lowest ip, becomes the new DR.
> 

AFAIK, the idea behind the trap is just to track a neighbor-loss event, and
to have only one router generate the trap (one with lowest-ip). It has
nothing to do with DR election.

raghava

> Thanks.
> 
> -- Karl
> 
> 
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