On 10/19/2010 01:03 AM, Michael Sinatra wrote:
Is anyone out there polling the IPv6 neighbor discovery cache via SNMP?
Previously, yes. I get them via expect/cli now, because the OID sorting
required for snmpwalk of that table on 6500s is prohibitively expensive
when it gets very large (well - it is for IPv4 & ipNetToMedia; I am
assuming the same for ipv6, and since the expect script already runs for
v4...)
I am mainly interested in getting the cache from 6500s running SXI4a
on the VS-720-10GE-3C. In earlier IOS versions (on different platforms,
I believe), this was done using the interim CISCO-IETF-IP-MIB
(specifically cInetNetToMediaTable), but it seems as though this should
all have been merged into the new RFC 4293-compliant IP-MIB. However,
with ip.ipNetToPhysicalTable, I get 'no such object'.
Not yet I think.
ipv6NetToMediaTable (part of the IPV6-MIB) works great on JunOS, but not
on cisco (also 'no such object'). It's not clear from the MIB locater
if this is even supported in SXI4a--looks like not. Are we really still
that far from IPv4/IPv6 feature parity?
Shrug. I wouldn't read too much into it.
Our code tries:
CISCO-IETF-IP-MIB::cInetNetToMediaEntry
1.3.6.1.4.1.9.10.86.1.1.3.1
...this still seems to work on our SXI4a test box (I just tested it);
remember you won't see anything if the neighbour cache is empty, as it
often is on quiet test boxes (I find).
Currently what I am doing is scraping "show ipv6 neighbor" via RANCID
and shoving it into a flat file for processing and insertion into a SQL
DB. But...yuck! This would be a lot cleaner with SNMP--and far fewer
moving parts. One perl script could easily poll and push into SQL all
at once.
Well, as I say above - that approach has advantages.
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