Mmm, looks like you have area 15 configured as a Not so stubby totally stubby area (NSSTSA) rather than as a not so stubby area (NSSA)...some slight differences as noted below; also, note how type 5 and 7 are (and are not) supported....LSA type 5 routes will not be used in a NSSA or NSSTSA; however, the same information conveyed by type 7 will (comes from ABR for the area).
NSSA: If there is an ABR configured into this area (to area 0), it will convert the LSA type 7 to an LSA type 5. The LSA type 5 that was a LSA type 7 gets passed to the backbone area, where it gets distributed as a normal LSA type 5 to the rest of the OSPF routing domain. This LSA type 5 does not get sent into the NSSA because the NSSA does not allow LSA type 5 into the area.not to mention that the NSSA routers already have this information via the LSA type 7. By default, type 5 LSAs cannot be summarized at an ASBR or ABR, though Type 7 can. An area is configured as a NSSA with the following command in OSPF configuration mode. This command must be entered on all routers in the area in order for them to become neighbors. area 1 nssa About NSSTSA... The Not So Stubby Totally Stubby Area (NSSTSA) is a special definition of the NSSA. It is more restrictive regarding what it allows into the area. The NSSTSA is similar to the NSSA, except that it does not allow LSA type 3 and 4 into the area. Otherwise, the NSSTSA is just like a NSSA. The NSSTSA ASBR creates LSA type 7 for the routes that it is redistributing from another routing protocol into the NSSTSA. The NSSTSA ABR converts the 7 into a 5 for propagation to the rest of the OSPF domain. A default route, sent as a LSA type 3 summary, is the only exception to NSSTSA rule that no 3 or 4 is allowed into the area. To configure a NSSTSA, enter the following command on the NSSTSA ABR only. This configures the ABR not to send LSA type 3 and 4 into the NSSTSA. All routers will be configured with the NSSA command, as previously discussed. On the NSSTSA ABR only: area 1 nssa no-summary On all other NSSTSA routers: area 1 nssa HTH, Charles ""Thomas Salmen"" wrote in message news:[EMAIL PROTECTED] > someone requested the configs; i'm sorry, i'm not sure who. > > and the links are numbered, btw. > > > 7500: > > interface atm 0/1/0.101 > ip address 192.168.10.1 255.255.255.252 > > ! > > ! > router ospf 120 > network 192.168.10.0 0.0.0.3 area 0 > network 10.64.0.0 0.0.0.255 area 14 > > ! > > > > 2500: > > interface ethernet 0 > ip address 172.16.10.5 255.255.255.252 > ! > interface serial 0/0.101 point-to-point > ip address 192.168.10.2 255.255.255.252 > > ! > > ! > router ospf 120 > network 192.168.10.0 0.0.0.3 area 0 > network 172.16.10.4 0.0.0.3 area 15 > area 15 nssa no-summary > ! > > the only other router in area 15 is at 172.16.10.6, and is configured as an > nssa asbr. > > the 7500 has all the type 5 lsas in its database, but none entered in its > route table. > > eg: > > 7500#show ip ospf database external 200.88.200.220 > > OSPF Router with ID (200.55.10.244) (Process ID 20) > > Type-5 AS External Link States > > LS age: 2576 > Options: (No TOS-capability, DC) > LS Type: AS External Link > Link State ID: 200.88.200.220 (External Network Number ) > Advertising Router: 200.27.100.154 > LS Seq Number: 80000008 > Checksum: 0x1A8B > Length: 36 > Network Mask: /32 > Metric Type: 2 (Larger than any link state path) > TOS: 0 > Metric: 2 > Forward Address: 0.0.0.0 > External Route Tag: 3221225472 > > 7500#show ip route | include 200.88.200.220 > > 7500# > > > > > thomas > > > > ----- Original Message ----- > From: Thomas Salmen > To: [EMAIL PROTECTED] > Sent: Tuesday, September 02, 2003 3:43 PM > Subject: ospf type 5 lsas > > > i have a problem with ospf that someone may be able to help with. > > i have a 2500 connected to a 7500 via a frame (2500 end) to atm (7500 end) > link. the 2500 is an abr for area 15 (serial area 0, ethernet area 15); the > 7500 is an abr for area 14 (atm area 0, other interfaces area 14). > > area 15 is configured as an nssa, as it is attached to another router which > is > redistributing static routes. area 14 is a standard ospf area, not stub or > nssa. > > the 2500 (abr) is recieving type 7 lsas and converting them to type 5 and > flooding them into area 0, no problems. the 7500 has them in its lsa > database. > the problem is that none of the type 5 lsas are being entered in the 7500s > route table. > > i have run through everything i can think of, and i'm a bit stuck. the > forwarding address of each lsa is 0.0.0.0. the network type is correct (ptp). > the 7500 can reach the abr and the asbr. subnet masks are all correct. i'm > not > sure what to look for next... > > anyone? > > thomas > **Please support GroupStudy by purchasing from the GroupStudy Store: > http://shop.groupstudy.com > FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=74712&t=74699 -------------------------------------------------- **Please support GroupStudy by purchasing from the GroupStudy Store: http://shop.groupstudy.com FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
