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[RRG] Re: map change due to a path failure?
On Mon, Mar 24, 2008 at 7:48 PM, Brian E Carpenter
> On 2008-03-23 09:50, William Herrin wrote:
> > 2a. What's the maximum acceptable time in which one EID may be
> > inaccessible to another because of a map change due to a path failure?
> That seems to assume that a failure will produce a map change.
> I expect a failure to produce a change in the routing tables,
> but why should a (temporary) failure produce any change
> in the map? I would expect this would cause the routing
> algorithm to be told about the failure and to find an alternative
> path involving the same or an alternative map entry.
I suppose that depends on how you split the duties between routing and
mapping. With TRRP, path failures between the endpoint and a little
ways upstream of the ETR will be handled by a map change (expressing
which ETRs are currently able to natively reach the endpoint) while
most path failures between the ITR and ETR will be handled by a BGP
route change. In both cases, the question which matters is: how long
does it take to detect the failure and restore service?
Lets rephrase the question so that it's agnostic on the map/route issue:
2a. What's the maximum acceptable time in which one EID may be
inaccessible to another during change propagation due to a path
William D. Herrin firstname.lastname@example.org email@example.com
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