[c-nsp] Have I Gone Mad? (OSPF NSSA)

[Marko Milivojevic]

Hello,

My understanding of OSPF is being challenged by recent upgrade of some
of our 7600's (running SRD2a now).

Pairs of 7600's are ABR's to totally stubby NSSA areas (area X nssa
no-summary default-information originate). This is supposed to prevent
all external and summary routes reaching NSSA area, as well as
originate type 7 default. However, I'm seeing something else. This is
from one of the internal routers (.227 and .228 are ABR's):

            OSPF Router with ID (xxx.yyy.zzz.24) (Process ID 1)

                Router Link States (Area 9)

Link ID         ADV Router      Age         Seq#       Checksum Link count
xxx.yyy.zzz.24  xxx.yyy.zzz.24  245         0x80009C45 0x006365 2
xxx.yyy.zzz.25  xxx.yyy.zzz.25  1596        0x80009C3F 0x008347 2
xxx.yyy.zzz.26  xxx.yyy.zzz.26  1560        0x80009C3D 0x009B2D 2
xxx.yyy.zzz.27  xxx.yyy.zzz.27  663         0x80009C3C 0x00B114 2
xxx.yyy.zzz.227 xxx.yyy.zzz.227 224         0x8000933F 0x00F96C 1
xxx.yyy.zzz.228 xxx.yyy.zzz.228 133         0x80005CBB 0x00A479 1

                Net Link States (Area 9)

Link ID         ADV Router      Age         Seq#       Checksum
xxx.yyy.zzz.130 xxx.yyy.zzz.228 1129        0x8000016A 0x00258A

                Summary Net Link States (Area 9)

Link ID         ADV Router      Age         Seq#       Checksum
0.0.0.0         xxx.yyy.zzz.227 224         0x80000165 0x007943
0.0.0.0         xxx.yyy.zzz.228 133         0x80000167 0x006F4A

                Type-7 AS External Link States (Area 9)

Link ID         ADV Router      Age         Seq#       Checksum Tag
0.0.0.0         xxx.yyy.zzz.227 224         0x80000165 0x004DEA 0
0.0.0.0         xxx.yyy.zzz.228 133         0x80000166 0x0045F0 0

ABR's appear to be injecting both the type 3 and type 7. AHave I gone
mad, or I need to hit back the books?

--
Marko
CCIE #18427 (SP)
My network blog: http://cisco.markom.info/