For example, if I had an ASBR in Area 0 redistributing 192.168.10.0/24, 192.168.11.0/24, and 192.168.12.0/24 from RIP into OSPF, I only want to advertise the 192.168.8.0/21 into the backbone.
Junos can summarize at the ABR using "area-range" or "nssa area-range" commands, but this is used to summarize an external route from another Area into the backbone, not from an ASBR.
You can either do the following:
1. move the router into another area. (not practical)
or
1. Create an aggregate/generated route covering the desired routes
2. Instead of importing the IGP routes in the routing policy, import the aggregate/generated route
-----------------------------
user@R3# run show route protocol rip
inet.0: 40 destinations, 40 routes (40 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
192.168.10.0/24 *[RIP/100] 22:17:43, metric 2, tag 0
> to 192.168.0.30 via ge-0/0/3.0
192.168.11.0/24 *[RIP/100] 22:17:43, metric 2, tag 0
> to 192.168.0.30 via ge-0/0/3.0
192.168.12.0/24 *[RIP/100] 22:17:43, metric 2, tag 0
> to 192.168.0.30 via ge-0/0/3.0
224.0.0.9/32 *[RIP/100] 02:05:02, metric 1
MultiRecv
inet6.0: 36 destinations, 39 routes (36 active, 0 holddown, 0 hidden)
[edit]
user@R3# show protocols ospf
export RIP->OSPF;
area 0.0.0.0 {
interface ge-2/0/0.0;
interface ge-2/0/1.0;
interface lo0.0;
}
area 0.0.0.2 {
nssa
interface vlan.100 {
bfd-liveness-detection {
minimum-interval 100;
}
}
}
jnpr@R3# show routing-options
aggregate {
route 192.168.8.0/21;
}
jnpr@R3# show policy-options policy-statement RIP->OSPF
term AGG {
from {
protocol aggregate;
route-filter 192.168.8.0/21 exact;
}
then accept;
}
term LAST {
then reject;
}
[edit]
user@R3# run show route protocol aggregate detail
inet.0: 40 destinations, 40 routes (40 active, 0 holddown, 0 hidden)
192.168.8.0/21 (1 entry, 1 announced)
*Aggregate Preference: 130
Next hop type: Reject
Address: 0x1147eec
Next-hop reference count: 4
State: <Active Int Ext>
Age: 2:36:04
Task: Aggregate
Announcement bits (2): 0-KRT 2-OSPF
AS path: I (LocalAgg)
Flags: Depth: 0 Active
AS path list:
AS path: I Refcount: 3
Contributing Routes (3):
192.168.10.0/24 proto RIP
192.168.11.0/24 proto RIP
192.168.12.0/24 proto RIP
looking at the prefix from another router in area 0
user@R2# run show route 192.168.8/21
inet.0: 37 destinations, 38 routes (37 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
192.168.8.0/21 *[OSPF/150] 02:32:53, metric 0, tag 0
> to 192.168.0.22 via ge-1/1/2.0
Looking at the prefix from another router in area 2 (NSSA)
user@R4# run show ospf database nssa
OSPF database, Area 0.0.0.2
Type ID Adv Rtr Seq Age Opt Cksum Len
NSSA 0.0.0.0 192.168.255.1 0x80000004 1209 0x20 0xec70 36
NSSA 192.168.8.0 192.168.255.3 0x80000001 16 0x20 0x809e 36
NSSA *192.168.20.0 192.168.255.7 0x8000001d 360 0x28 0x7d95 36
NSSA *192.168.21.0 192.168.255.7 0x8000001c 1563 0x28 0x749e 36
NSSA *192.168.123.252 192.168.255.7 0x8000001c 961 0x28 0x2c83 36
user@R4# run show route 192.168.8/21
inet.0: 37 destinations, 37 routes (37 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
192.168.8.0/21 *[OSPF/150] 00:02:12, metric 0, tag 0
> to 192.168.0.60 via vlan.100
