[j-nsp] Copy of inet.0
Pedro Roque Marques
roque at juniper.net
Fri Oct 29 18:06:23 EDT 2004
John Payne writes:
> Which version? 6.4 gives me:
>  jpayne at lab# show routing-instances
>  jpayne at lab# set routing-instances FOO instance-type
Sorry, you will need to switch the instance type to
virtual-router. Which is the same thing, expect that it can take
> 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
nexthop a, b
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
If you want/need path 2, maybe w/ different attributes, then you have
to explicitly use rib-groups.
Both mecanisms use whatever next-hop the path has (regardless if it
has 1 or more gateways).
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.
I hope i've not added to the confusion...
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