[j-nsp] Copy of inet.0
john at sackheads.org
Thu Nov 11 22:04:29 EST 2004
On Oct 29, 2004, at 6:06 PM, Pedro Roque Marques wrote:
> Sorry, you will need to switch the instance type to
> virtual-router. Which is the same thing, expect that it can take
> interface statements...
OK... I seem to recall other differences with virtual-router, but I can
try it again.
>> Will instance-import pull out individual routes from a multipath
>> setup? ie if I have multiple active multipath routes to a
>> destination, can I use instance-import to grab one of them? (Based
>> on community perhaps?)
> Depends on what you are refering to...
> There is prefix (route), path (route entry) and next-hop...
> i.e. if you do a show route you will see something like
> path 1
> nexthop a, b
> path 2
> Inactive due to: something.
> nexthop c, d
> BGP will install multiple paths to the same prefix... IGPs will only
> install one path.
> instance-import will only pick the active path (path 1 above). This is
> how the mecanism is defined... and it serves to avoid the potential
> case where you would just be duplicating all received routing updates
> between tables.
> If you want/need path 2, maybe w/ different attributes, then you have
> to explicitly use rib-groups.
I have a set of devices advertising the same prefix. Right now, I'm
manually grouping them using rib-groups and then multipath from there,
but I'd love to be able to move the groups around based on communities.
> You can pick between the multiple next-hops which one is used for
> forwarding via the install-next hop policy action on routing-options
> forwarding export policy.
Yeah, that's not the right place to make the decision in this case :)
> I hope i've not added to the confusion...
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