[Pool] Pool server monitoring 12ms offset

der Mouse mouse at Rodents-Montreal.ORG
Tue Jun 8 18:43:40 UTC 2010


> If, for instance, you have four OSPF routers arranged like this:

>   A --> B
>   ^     |
>   |     v
>   D <-- C

> where each connection is assymetric, with higher bandwidth / lower
> latency in the direction of the arrow, a packet from A to C will be
> routed through B, but a packet from C to A will be routed through D.

> If, on the other hand, all connections are symmetric, it does not
> matter whether a packet from A to C (or from C to A) is routed
> through B or D.

That actually does not follow.  It's true only if the connections are
not only symmetric but equivalent.  If, for example, all connections
are totally symmetric - both directions the same - but the D<->C link
has substantially higher latency (both ways) than the other three, then
(absent congestion and the like) A<->C will perform better if routed
through B.

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