On Mon, Mar 24, 2008 at 7:48 PM, Brian E Carpenter <[EMAIL PROTECTED]> wrote: > 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.
Hi Brian, 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 failure? Regards, Bill Herrin -- William D. Herrin [EMAIL PROTECTED] [EMAIL PROTECTED] Web: <http://bill.herrin.us/> -- to unsubscribe send a message to [EMAIL PROTECTED] with the word 'unsubscribe' in a single line as the message text body. archive: <http://psg.com/lists/rrg/> & ftp://psg.com/pub/lists/rrg
