[KFUG] zebra OSPF6 에서 ABR에 관한 질문

[최재덕 <jdchoi@xxxxxxxxxx>]

안녕하세요!
FreeBSD에서 IPv6 라우팅 동작을 테스트하는데 이상한 현상이 나타나서 도움을 요청합니다.

환경은 다음과 같습니다.
FreeBSD 4.8
KAME
Zebra 0.94


FreeBSD 4.8 에 OSPF6d (Zebra-0.94 ospf6d-0.9.6p)를 아래와 같이 설치 하였습니다.

    IPv6 addr                    3ffe:2e00:e:fff5::5                            3ffe:2e00:e:fff5::22                      3ffe:2e01:1:8::30
    네트워크 구성도          PC(lnc0)-------------------------------------------(fastethernet0/0) CISCO 2600  (fastethernet0/1)---------------------
    PC 쪽은 area 1.1.1.1 로 셋팅하고
    CISCO 2600 쪽은 FastEthernet0/0 은 area 1.1.1.1  FastEthernet0/1은 area 0.0.0.0 으로 설정하였습니다.

이렇게 설정하면 CISCO 는 Area Border Router로 동작하여 PC 쪽으로 Inter-Area-Prefix-LSA를 전달하고
PC의 라우팅 테이블에 3ffe:2e01:1:8::/64 이 추가 되야 될것 같은데 처음엔 라우팅 테이블이 생성되지 않다가
CISCO의 fastethernet0/1 쪽에 ospf area 설정을 다시 하면 생성됩니다.

혹시 무엇 때문에 이런 현상이 나타나는지 답변 부탁드립니다.

아래는 디버그 메시지입니다. 한번 보시고 어떤 현상인지 좀 알려주시기 바랍니다.



2005/01/20 01:06:35 OSPF6: Receive LSA (header -> 0xbfbfc724)
2005/01/20 01:06:35 OSPF6: DBEX: Receive new LSA from 172.16.29.60%lnc1: [Link ID=0.0.0.3 Adv=172.16.29.60] seq: 0x80000001 age: 43: 1106150795.558401
2005/01/20 01:06:35 OSPF6: Receive LSA (header -> 0xbfbfc75c)
2005/01/20 01:06:35 OSPF6: DBEX: Receive new LSA from 172.16.29.60%lnc1: [Router ID=0.0.0.0 Adv=172.16.29.60] seq: 0x80000003 age: 3: 1106150795.564879
2005/01/20 01:06:35 OSPF6: Receive LSA (header -> 0xbfbfc774)
2005/01/20 01:06:35 OSPF6: DBEX: Receive new LSA from 172.16.29.60%lnc1: [Inter-Prefix ID=0.0.0.0 Adv=172.16.29.60] seq: 0x80000001 age: 43: 1106150795.565318
------------------------------------- 최초 ABR check error 메시지 ---------------------------
2005/01/20 01:06:35 OSPF6: ABR: Calculate [Inter-Prefix ID=0.0.0.0 Adv=172.16.29.60]
ABR2: abr_en->path.area_id = 0.0.0.0, aea->area_id = 1.1.1.1, abr->route_id = 0.0.0.0
2005/01/20 01:06:35 OSPF6: ABR:   Router 172.16.29.60 not found in area 1.1.1.1
2005/01/20 01:06:35 OSPF6: ABR: ABR check failed
-----------------------------------------------------------------------------------------
2005/01/20 01:06:35 OSPF6: Receive LSA (header -> 0xbfbfc798)
2005/01/20 01:06:35 OSPF6: DBEX: Receive new LSA from 172.16.29.60%lnc1: [Intra-Prefix ID=0.0.0.0 Adv=172.16.29.60] seq: 0x80000001 age: 43: 1106150795.568061
2005/01/20 01:06:35 OSPF6: AREA: Self-originated route remove, ignore
2005/01/20 01:06:35 OSPF6: AREA: Self-originated route add, ignore
2005/01/20 01:06:35 OSPF6: LSA: originate [Network ID=0.0.0.2 Adv=192.168.0.113] seq: 0x80000001 age: 0 1106150795.569275
2005/01/20 01:06:35 OSPF6: LSA: originate [Intra-Prefix ID=0.0.0.2 Adv=192.168.0.113] seq: 0x80000001 age: 0 1106150795.570315
2005/01/20 01:06:35 OSPF6: LSA: originate [Router ID=0.0.0.0 Adv=192.168.0.113] seq: 0x80000002 age: 0 1106150795.595384
2005/01/20 01:06:35 OSPF6: Receive LSA (header -> 0xbfbfc724)
2005/01/20 01:06:35 OSPF6: Receive LSA (header -> 0xbfbfc75c)
2005/01/20 01:06:35 OSPF6: Receive LSA (header -> 0xbfbfc774)
2005/01/20 01:06:35 OSPF6: Receive LSA (header -> 0xbfbfc798)
2005/01/20 01:06:36 OSPF6: Receive LSA (header -> 0xbfbfc724)
2005/01/20 01:06:36 OSPF6: DBEX: Receive new LSA from 172.16.29.60%lnc1: [Intra-Prefix ID=0.0.0.0 Adv=172.16.29.60] seq: 0x80000002 age: 3600 within MinLSArrival, drop: 1106150796.087169
2005/01/20 01:06:38 OSPF6: LSACK: questionable acknowledge: [Router ID=0.0.0.0 Adv=192.168.0.113]
2005/01/20 01:06:38 OSPF6: LSACK:   received: seq: 0x80000001 age: 65
2005/01/20 01:06:38 OSPF6: LSACK:   instance: seq: 0x80000002 age: 3
2005/01/20 01:06:38 OSPF6: LSACK: questionable acknowledge: [Intra-Prefix ID=0.0.0.0 Adv=192.168.0.113]
2005/01/20 01:06:38 OSPF6: LSACK:   received: seq: 0x80000001 age: 65
2005/01/20 01:06:38 OSPF6: LSACK:   instance: seq: 0x80000001 age: 3600
2005/01/20 01:06:38 OSPF6: Receive LSA (header -> 0xbfbfc724)
2005/01/20 01:06:38 OSPF6: DBEX: Receive new LSA from 172.16.29.60%lnc1: [Router ID=0.0.0.0 Adv=172.16.29.60] seq: 0x80000004 age: 1: 1106150798.515276
2005/01/20 01:06:40 OSPF6: Receive LSA (header -> 0xbfbfc724)
2005/01/20 01:06:40 OSPF6: DBEX: Receive new LSA from 172.16.29.60%lnc1: [Intra-Prefix ID=0.0.0.0 Adv=172.16.29.60] seq: 0x80000002 age: 3600: 1106150800.859216
2005/01/20 01:06:43 OSPF6: Receive LSA (header -> 0xbfbfc724)
2005/01/20 01:06:43 OSPF6: DBEX: Receive new LSA from 172.16.29.60%lnc1: [Router ID=0.0.0.0 Adv=172.16.29.60] seq: 0x80000005 age: 1: 1106150803.630378

2005/01/20 01:07:30 OSPF6: Receive LSA (header -> 0xbfbfc724)
2005/01/20 01:07:30 OSPF6: Receive LSA (header -> 0xbfbfc724)
2005/01/20 01:07:30 OSPF6: DBEX: Receive new LSA from 172.16.29.60%lnc1: [Router ID=0.0.0.0 Adv=172.16.29.60] seq: 0x80000006 age: 1: 1106150850.795945
2005/01/20 01:07:59 OSPF6: Receive LSA (header -> 0xbfbfc724)
2005/01/20 01:07:59 OSPF6: DBEX: Receive new LSA from 172.16.29.60%lnc1: [Router ID=0.0.0.0 Adv=172.16.29.60] seq: 0x80000007 age: 1: 1106150879.163630
2005/01/20 01:08:08 OSPF6: Receive LSA (header -> 0xbfbfc724)
2005/01/20 01:08:08 OSPF6: DBEX: Receive new LSA from 172.16.29.60%lnc1: [Inter-Prefix ID=0.0.0.1 Adv=172.16.29.60] seq: 0x80000001 age: 1: 1106150888.672235
------------------------------------------ CISCO fastethetnetf0/1 에서 ospf area 재설정 했을때 ABR 관련 메시지 --------------------
2005/01/20 01:08:08 OSPF6: ABR: Calculate [Inter-Prefix ID=0.0.0.1 Adv=172.16.29.60]
ABR2: abr_en->path.area_id = 1.1.1.1, aea->area_id = 1.1.1.1, abr->route_id = 2.0.0.0
2005/01/20 01:08:08 OSPF6: ABR: Inter Area Route add for [Inter-Prefix ID=0.0.0.1 Adv=172.16.29.60]
2005/01/20 01:08:08 OSPF6: ABR: Logical equivalent of split horizon, skip for 1.1.1.1
----------------------------------------------------------------------------------------------------------------------------

2005/01/20 01:09:04 OSPF6: Receive LSA (header -> 0xbfbfc724)
2005/01/20 01:09:05 OSPF6: Receive LSA (header -> 0xbfbfc724)
2005/01/20 01:09:05 OSPF6: DBEX: Receive new LSA from 172.16.29.60%lnc1: [Router ID=0.0.0.0 Adv=172.16.29.60] seq: 0x80000008 age: 1: 1106150945.186681

2005/01/20 01:09:11 OSPF6: Receive LSA (header -> 0xbfbfc724)
2005/01/20 01:09:11 OSPF6: DBEX: Receive new LSA from 172.16.29.60%lnc1: [Router ID=0.0.0.0 Adv=172.16.29.60] seq: 0x80000009 age: 1: 1106150951.103215
2005/01/20 01:09:17 OSPF6: Receive LSA (header -> 0xbfbfc724)
2005/01/20 01:09:17 OSPF6: DBEX: Receive new LSA from 172.16.29.60%lnc1: [Inter-Prefix ID=0.0.0.2 Adv=172.16.29.60] seq: 0x80000001 age: 1: 1106150957.381559
------------------------------------ CISCO fastethetnetf0/1 에서 ospf area 설정을 또 다시 했을때 ABR 관련 메시지 --------------------
2005/01/20 01:09:17 OSPF6: ABR: Calculate [Inter-Prefix ID=0.0.0.2 Adv=172.16.29.60]
ABR2: abr_en->path.area_id = 1.1.1.1, aea->area_id = 1.1.1.1, abr->route_id = 2.0.0.0
2005/01/20 01:09:17 OSPF6: ABR: Inter Area Route add for [Inter-Prefix ID=0.0.0.2 Adv=172.16.29.60]
----------------------------------------------------------------------------------------------------------------------------

^C2005/01/20 01:21:38 OSPF6: SIGINT received
2005/01/20 01:21:38 OSPF6: ABR: Logical equivalent of split horizon, skip for 1.1.1.1
2005/01/20 01:21:38 OSPF6: ABR: Logical equivalent of split horizon, skip for 1.1.1.1
2005/01/20 01:21:38 OSPF6: OSPF6d (Zebra-0.94 ospf6d-0.9.6p) terminated
router2# fastboot

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