[c-nsp] cbgpPeer2AdvertisedPrefixes different than 'show bgp nei X advertised-routes'

[arulgobinath emmanuel]

Hi David,
I've experienced the same in 5.3.3 ASR9K. so I think its not fixed yet.
maybe you can explore BMP as the solution but make sure there is no memory
leak due to BMP (eg : when server shutdown).

Best Regards,
Gobinath.


On Fri, Apr 20, 2018 at 2:32 AM, David Hubbard <
dhubbard at dino.hostasaurus.com> wrote:

> I’m curious if anyone has noticed issues with CISCO-BGP4-MIB values
> related to prefix counts on IOS XR?  I’m querying a 6.2.3 device and seeing
> weird results.
>
> I’d like to monitor the number of prefixes advertised and received from
> eBGP peers.  The mib defines cbgpPeerAcceptedPrefixes as a Counter32, and
> cbgpPeerAdvertisedPrefixes as a Gauge32.  That’s the first thing that
> doesn’t make sense.  Both values should be Gauge32 since counting ongoing
> changes to the prefix counts is a useless metric for the device to be
> tracking.
>
> So, first is accepted prefixes; cbgpPeerAcceptedPrefixes.  Even though
> it’s defined in the MIB as a Counter32, the data being returned appears to
> be a current reading, i.e. a Gauge32.  I can make do with the wrong data
> classification since the values seem to be what I want regardless.
>
> Then I’ve got cbgpPeerAdvertisedPrefixes, which is defined as a Gauge32,
> but appears to be behaving like a counter, making the data completely
> useless.  One peer is showing double the advertisements of another, even
> though the actual advertisements are the same.  That particular peer has
> flapped once since the monitoring began, hence my suspicion that it’s
> behaving like a counter.  The value returned for iBGP peers, on my edge
> routers, is incrementing constantly, currently at 37 million+, adding to
> the evidence it’s a counter, and useless.  I have not yet found an OID I
> can query that gives me a current advertised count.
>
> Do other platforms behave like this or would this be a bug in the
> implementation on my particular device?
>
> Thanks
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