Messages in this thread | | | Date | Thu, 30 Mar 2000 09:12:24 +0300 (EEST) | From | Jarno Lahteenmaki <> | Subject | Re: iproute and 2.3 question |
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On Wed, 29 Mar 2000, Andi Kleen wrote:
> On Wed, Mar 29, 2000 at 12:28:01PM +0200, fooler wrote: > > Andi Kleen wrote: > > > > > > > > It has not been integrated, because equalization on the routing cache > > > layer does not work well (not fine grained enough or too slow) > > > > > > > hello andi, > > > > can you explain it further? > > Linux has a routing cache that caches routing table lookups. This > is called the destination cache. A destination cache entry is tied > to a specific destination, which means only a single neighbour > on a multipath route. To use multipath routing for load balancing > requires dropping the destination entry after every use, so that > another neighbour in the multipath could be looked up (the destination > cache knows nothing about multipaths, that is all encapsulated in the > FIB or routing table) > > Dropping them all the time does not work well and is slow. It is also > not finegrained enough (because the decision occurs to early) to get an > even load balancing > > Multipath routing is only useful for failover when a device is down in Linux. > > For load balancing you can use the existing eql, teql and bonding devices, > which work at a lower layer and avoid these problems.
Does eql, teql or bonding devices have any failover capabilities?
--> Jarno Lähteenmäki (30.03.2000) --> Telecenter Oy / Espoo
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