[c-nsp] Load Balancing

[Oliver Boehmer (oboehmer)]

Marko Milivojevic <> wrote on Wednesday, December 28, 2005 6:18 PM:

>> I am trying to load balance using two routes provided by different
>> protocols.  Even when I set the administrative distance to be equal,
>> only one route appears.  Is there a trick to making this work or is
>> it hopeless?
> 
> 	Hm. This is an interersting question for me... If we configure
two
> routing protocols to use the same AD, which one will "win", as their
> metrics are usually not comparable?

as far as I know, the behavior in this case is not documented, hence it
should be avoided. 
In halfway recent code (since CSCdu32820), we use the protocol's default
admin distance as tie-braker when two protocols configured with the same
AD try to install the route into the RIB. If the protocols are identical
(i.e. you have two OSPF processes), the oldest route wins, if I recall
correctly.. 
But, as I said: This config should be avoided.

	oli