From: Bernard Omrani (Bernard@networkking.net)
Date: Sun Sep 15 2002 - 03:44:44 GMT-3
You can not summarize external (here EIGRP) routes with the area range command.
You have to use summary-address under router ospf.
Bernard
ALL,
I just got a weird one. I dunno if it's IOS related or not, anyway,
here's the topology.
R1 -- OSPF (Area 0) -- R2 -- OSPF (Area 3 NSSA) --- R3 --- EIGRP -- R4
I have 3 EIGRP networks that are being injected into R3 from R4
(20.2.0.0/16, 20.3.0.0/16 & 20.4.0.0/16), and I can see them all at R2
as O N2 routes. I want to summarzie them before they are injected into
Area 0. So I use the "area 3 range" command at R2 (NSSA ABR & Area 0
ABR)
router ospf 1
log-adjacency-changes
area 3 nssa
area 3 range 20.0.0.0 255.248.0.0
network 172.16.1.0 0.0.0.255 area 3
network 192.168.1.0 0.0.0.255 area 0
But then when I checked the Routing Table at R1, all those 20.x.0.0
routes still appears as their own routes, and the summary route
(20.0.0.0/13) aren't even there.
R1#sh ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B -
BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS
inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
20.0.0.0/16 is subnetted, 3 subnets
O E2 20.4.0.0 [110/20] via 192.168.1.1, 00:49:03, Serial0
O E2 20.2.0.0 [110/20] via 192.168.1.1, 00:49:03, Serial0
O E2 20.3.0.0 [110/20] via 192.168.1.1, 00:49:03, Serial0
5.0.0.0/24 is subnetted, 1 subnets
O E2 5.5.5.0 [110/20] via 192.168.1.1, 00:49:03, Serial0
172.16.0.0/24 is subnetted, 1 subnets
O IA 172.16.1.0 [110/128] via 192.168.1.1, 00:49:26, Serial0
10.0.0.0/30 is subnetted, 1 subnets
O E2 10.1.1.4 [110/20] via 192.168.1.1, 00:49:27, Serial0
11.0.0.0/32 is subnetted, 1 subnets
C 11.1.1.1 is directly connected, Loopback0
C 192.168.1.0/24 is directly connected, Serial0
R1#
Another funny stuff I found is when I used "show ip ospf" on R2, it has
a "passive advertise" that I haven't seen before. Does it mean
anything?
R2#sh ip ospf
Routing Process "ospf 1" with ID 1.1.1.1
Supports only single TOS(TOS0) routes
Supports opaque LSA
It is an area border and autonomous system boundary router
Redistributing External Routes from,
SPF schedule delay 5 secs, Hold time between two SPFs 10 secs
Minimum LSA interval 5 secs. Minimum LSA arrival 1 secs
Number of external LSA 5. Checksum Sum 0x38D59
Number of opaque AS LSA 0. Checksum Sum 0x0
Number of DCbitless external and opaque AS LSA 0
Number of DoNotAge external and opaque AS LSA 0
Number of areas in this router is 2. 1 normal 0 stub 1 nssa
External flood list length 0
Area BACKBONE(0)
Number of interfaces in this area is 1
Area has no authentication
SPF algorithm executed 7 times
Area ranges are
Number of LSA 3. Checksum Sum 0xBED7
Number of opaque link LSA 0. Checksum Sum 0x0
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
Area 3
Number of interfaces in this area is 1
It is a NSSA area
Perform type-7/type-5 LSA translation
Area has no authentication
SPF algorithm executed 9 times
Area ranges are
20.0.0.0/13 Passive Advertise <--- what does this mean?
Number of LSA 8. Checksum Sum 0x42B10
Number of opaque link LSA 0. Checksum Sum 0x0
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
R2#
thx
Hunt
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