[c-nsp] Anycast Questions
Phil Mayers
p.mayers at imperial.ac.uk
Wed Feb 16 08:42:12 EST 2011
On 16/02/11 13:39, Gert Doering wrote:
> Hi,
>
> On Wed, Feb 16, 2011 at 09:04:49AM +0000, Phil Mayers wrote:
>>> Which makes "monitoring whether everything is fine" a somewhat more
>>> interesting challenge :-) - if the machine is up, but bgpd fails, the
>>> service might silently fall over to another instance and things like
>>> "does this anycasted DNS server still respond?" will happily report
>>> success...
>>
>> SNMP to pool the BGP neighbour status?
>
> If that would work for IPv6 BGP peers...
Ah.
>
> We're mostly not relying on SNMP to monitor things, but on ping and
> "service queries" (DNS probes, HTTP checks, ...) to the actual services,
> interface IPs, etc.
We do that too.
I did wonder at one point about using GRE tunnels and Linux policy
routing so that I could "select" which backend of a virtual IP I was
checking against.
More information about the cisco-nsp
mailing list