No, junos does not automatically redistribute bgp into igp by default.
>From a quick read it sounds to me like the cisco is set to redistribute bgp
>into ospf (though you did say isis is the igp). That would explain why all the
>externals appear after ospf adjacency up.
Perhaps due to rule of sync, which is normally disabled to avoid such a
ridiculous need (that is, to require that the igp have a route before it can be
advertised by BGP).
I would check the ios config for a redistribute bgp under isis or such.
Should be easy to confirm from where the externals are originating through its
router-id.
Your policy below seems sufficient to advertise a default route, but it will
not block any type 1, 2, 3, 4, and 5 lsas that are present (say due to a full
bgp feed being leaked into the igp). If you wish *only* a default and type 1/2
lsas (and a type 3 for the default) you may consider setting as a totally
stubby network (which should not be area 0):
{master}[edit]
regress@mse-a# show protocols ospf area 1
stub default-metric 10 no-summaries;
With this config you will not need the static default as it will be
auto-generated.
HTHs
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Alex D.
Sent: Saturday, July 09, 2011 10:55 AM
To: Juniper-Nsp
Subject: [j-nsp] External routes in OSPF database
Hello,
we have a MPLS enabled backbone with about 30 routers. IS-IS is used as IGP.
All routers have iBGP sessions with our two route-reflectors and get BGP
full-feed from them.
Now i try to setup OSPF with area 0.0.0.0 for connecting customers to one of
our PE routers (running JUNOS 7.5R2.8). Customer should get only a default
route via OSPF.
Now i have the problem that all BGP routes appear as external routes in OSPF
database, but only when adjacency to the neighbor router, a Cisco 1841, is up.
Without an adjacency, OSPF database looks like:
<router># run show ospf database summary
Area 0.0.0.0:
2 Router LSAs
Externals:
3 Extern LSAs
Interface ge-0/1/0.22:
When adjacency is up, it looks like:
<router># run show ospf database summary
Area 0.0.0.0:
2 Router LSAs
Externals:
14396 Extern LSAs --> after a while, there appear all BGP routes
Interface ge-0/1/0.22:
Now my questions:
- Is that the default behaviour of a Juniper router ?
- Why appear all BGP routes in OSPF database as external routes not before
adjacency is up ?
- How can i avoid appearence of these routes in OSPF database ?
- How do i achieve that *only* default-route is announced to customer ?
My corresponding OSPF specidic configuration looks as follows:
routing-options {
static {
route 0.0.0.0/0 discard;
}
router-id <removed>;
}
policy-options {
policy-statement RM_DEFAULT_ROUTE_TO_OSPF {
term default-route {
from {
protocol static;
route-filter 0.0.0.0/0 exact;
}
then accept;
}
term explicit-deny {
then reject;
}
}
}
protocols {
ospf {
traceoptions {
file ospf size 500000 files 5;
flag state;
}
export RM_DEFAULT_ROUTE_TO_OSPF;
area 0.0.0.0 {
interface ge-0/1/0.22 {
authentication {
simple-password <removed>;
}
}
interface all {
disable;
}
}
}
}
Thanks in advance for your help...
Regards,
Alex
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