기본적인 라우터 실행2
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Transcript 기본적인 라우터 실행2
Router 구성도 (1/2)
AS 100
AS 200
Area 0
Area 1
Area 2
ASBR
ASBR
0/1
192.168.14.9
192.168.14.10
192.168.2.6
192.168.1.2
0/0
192.168.3.9
Cisco 2610XM
Cisco 2610XM
ABR
ABR
0/0
192.168.1.1
Cisco 2611XM
0/1
192.168.2.1
0/0
192.168.2.5
Cisco 2611XM
Cisco 2611XM
AS 300
0/1
192.168.3.5
0/0
192.168.3.13
192.168.1.3
0/1
192.168.15.13
192.168.2.7
ASBR
192.168.15.11
ASBR
Cisco 2611XM
1
Cisco 2610XM
Router 구성도 (2/2)
AS 200
AS 100
6
Area 1
Area 0
ASBR
9
Area 2
2
0/0
192.168.3.9
192.168.2.6
192.168.1.2
2610XM
1
4
3
0/0
192.168.1.1
Catalyst 2950
Switch
5
ABR
8
0/1
192.168.2.1
2611XM
ABR
Catalyst 2950
Switch
2611XM
7
192.168.1.3
192.168.2.7
0/0
192.168.3.13
13
Cisco 2611XM : 4대
Cisco 2610XM : 6대
Switch
ASBR
192.168.14.10
Catalyst 2950
Switch
0/1
192.168.15.13
11
15
ASBR
192.168.15.11
Catalyst 2950
Switch
AS 300
Router
10
Catalyst 2950
Switch
ASBR
2611XM
2611XM
12
0/1
192.168.3.5
0/0
192.168.2.5
14
0/1
192.168.14.9
Cisco Catalyst 2950 : 5대
2
Router & Switch
Cisco 2611XM
FastEthernet interface : 2개
FastEthernet 0/1
Cisco 2610XM
FastEthernet 0/0
FastEthernet interface : 1개
Cisco Catalyst 2950 switch
FastEthernet 0/0
24-port switch
3
Console
Router #2 (1/3)
Configuration
6
Area 1
Area 0
2
192.168.2.6
192.168.1.2
2610XM
1
4
3
Catalyst 2950
Switch
192.168.1.3
Routing table
connected
OSPF
OSPF Inter Area
4
0/0
192.168.1.1
5
ABR
8
0/1
192.168.2.1
2611XM
ABR
0/0
192.168.2.5
Catalyst 2950
Switch
2611XM
7
192.168.2.7
Router #2 (2/3)
OSPF interface
6
Area 1
Area 0
2
DR
192.168.2.6
192.168.1.2
2610XM
1
4
3
Catalyst 2950
Switch
192.168.1.3
BDR
OSPF neighbor
DR 또는 BDR이 아닌 router
Backup Designated Router
5
0/0
192.168.1.1
5
ABR
8
0/1
192.168.2.1
2611XM
ABR
0/0
192.168.2.5
Catalyst 2950
Switch
2611XM
7
192.168.2.7
Router #2 (3/3)
Ping, traceroute
6
Area 1
Area 0
ASBR
9
Area 2
2
0/0
192.168.3.9
192.168.2.6
192.168.1.2
2610XM
1
4
3
0/0
192.168.1.1
Catalyst 2950
Switch
192.168.1.3
5
ABR
8
0/1
192.168.2.1
2611XM
0/0
192.168.2.5
Catalyst 2950
Switch
ABR
2611XM
192.168.2.7
Catalyst 2950
Switch
0/0
192.168.3.13
13
ASBR
2611XM
6
2611XM
12
0/1
192.168.3.5
7
0/1
192.168.14.9
0/1
192.168.15.13
Router #1 (1/2)
Configuration
6
Area 1
Area 0
2
192.168.2.6
192.168.1.2
2610XM
1
4
3
Catalyst 2950
Switch
192.168.1.3
Routing table
OSPF Inter Area
7
0/0
192.168.1.1
5
ABR
8
0/1
192.168.2.1
2611XM
ABR
0/0
192.168.2.5
Catalyst 2950
Switch
2611XM
7
192.168.2.7
Router #1 (2/2)
OSPF interface 정보
DR
6
Area 1
DR
Area 0
2
192.168.2.6
192.168.1.2
2610XM
1
4
3
0/0
192.168.1.1
Catalyst 2950
Switch
5
ABR
2611XM
// Router #7은 ‘2-Way state’
OSPF neighbor
8
2611XM
7
192.168.2.7
DROTHER
ABR
0/0
192.168.2.5
Catalyst 2950
Switch
192.168.1.3
BDR
8
0/1
192.168.2.1
BDR
OSPF state transition diagram
Down
Start
Hello
Received
Attempt
Init
Hello Received
1-Way Received
ExStart
2-Way
Received
2-Way
Negotiation
Done
Exchange
Loading
Loading
Done
Full
Init : 첫 번째 Hello packet을 받은 상태
2-Way : 모든 neighbor router들과의 2-way connection 설정 단계(Routing information 교환 안됨)
Exstart : Database Description Packet(OSPF packet type 2)을 통해 master/slave 선출
(기준 : OSPF Router ID가 높은것)
Exchange : master/slave는 한 개 이상의 Database Description Packet을 교환
Load
Exchange
Done
DDP에 최신의 Link-State entry 정보가 있다면 인접 router에게 LSR packet 전송
LSR을 받은 인접 라우터는 LSU packet으로 응답
Full : 인접 router들과 synchronization 완료
router는 traffic을 routing 하기전에 ‘Full state’에 있어야만 함
각 router는 ‘Adjacent Database’라는 인접한 router들의 리스트를 관리
9
Switch #4 – packet capture
Hello packet
// 224.0.0.5 : all OSPF routers
Area 1
2
192.168.1.2
2610XM
1
4
3
Catalyst 2950
Switch
192.168.1.3
10
0/0
192.168.1.1
ABR
0/1
192.168.2.1
2611XM
Router #6 (1/2)
Configuration
DR
6
Area 1
Area 0
2
192.168.2.6
DROTHER
192.168.1.2
2610XM
1
4
3
0/0
192.168.1.1
Catalyst 2950
Switch
5
ABR
2611XM
Routing table
11
DR
2611XM
7
192.168.2.7
DROTHER
ABR
0/0
192.168.2.5
Catalyst 2950
Switch
192.168.1.3
BDR
8
0/1
192.168.2.1
Router #6 (2/2)
Interface
DR
6
Area 1
Area 0
2
192.168.2.6
DROTHER
192.168.1.2
2610XM
1
4
3
0/0
192.168.1.1
Catalyst 2950
Switch
5
ABR
2611XM
OSPF neighbor
12
DR
2611XM
7
192.168.2.7
DROTHER
ABR
0/0
192.168.2.5
Catalyst 2950
Switch
192.168.1.3
BDR
8
0/1
192.168.2.1
Router #5 (1/2)
Configuration
6
Area 0
DR
0/0
192.168.1.1
5
ABR
8
0/1
192.168.2.1
BDR
2611XM
Catalyst 2950
Switch
2611XM
192.168.2.7
DROTHER
Routing table
13
ABR
2611XM
12
0/1
192.168.3.5
0/0
192.168.2.5
7
0/1
192.168.14.9
DR
0/0
192.168.3.9
192.168.2.6
1
ASBR
9
Area 2
Catalyst 2950
Switch
0/0
192.168.3.13
13
ASBR
2611XM
0/1
192.168.15.13
BDR
Router #5 (2/2)
Interface
6
Area 0
DR
0/0
192.168.1.1
5
ABR
8
0/1
192.168.2.1
BDR
2611XM
Catalyst 2950
Switch
2611XM
192.168.2.7
DROTHER
OSPF neighbor
14
ABR
2611XM
12
0/1
192.168.3.5
0/0
192.168.2.5
7
0/1
192.168.14.9
DR
0/0
192.168.3.9
192.168.2.6
1
ASBR
9
Area 2
Catalyst 2950
Switch
0/0
192.168.3.13
13
ASBR
2611XM
0/1
192.168.15.13
BDR
Switch #8 – packet capture (1/14)
‘Area 1’과 link를 해제했을 때
‘Area 1’과 link 해제 시점
Dead time interval
(40sec)
Router #1의 연결 해제를 알림
192.168.2.5의 주기적인 Hello pkt.
LSU에 대한 ACK
LSU에 대한 ACK
6
Area 0
0/0
192.168.3.9
192.168.2.6
1
0/0
192.168.1.1
5
ABR
8
0/1
192.168.2.1
X
2611XM
ASBR
9
Area 2
ABR
Catalyst 2950
Switch
2611XM
7
192.168.2.7
DR
Catalyst 2950
Switch
0/0
192.168.3.13
13
ASBR
2611XM
15
2611XM
12
0/1
192.168.3.5
0/0
192.168.2.5
0/1
192.168.14.9
0/1
192.168.15.13
Switch #8 – packet capture (2/14)
DR(192.168.2.5)이 All OSPF Router에게 Link-State Advertise
LSA type 2 : DR에 의해 생성. Area 내에 연결된 router의 집합을 설명
6
Area 0
0/0
192.168.3.9
192.168.2.6
1
0/0
192.168.1.1
5
ABR
X
8
0/1
192.168.2.1
2611XM
ASBR
9
Area 2
ABR
Catalyst 2950
Switch
2611XM
7
192.168.2.7
DR
Catalyst 2950
Switch
0/0
192.168.3.13
13
ASBR
2611XM
// Attached Router : 192.168.2.1의 list가 삭제되었음
16
2611XM
12
0/1
192.168.3.5
0/0
192.168.2.5
0/1
192.168.14.9
0/1
192.168.15.13
Switch #8 – packet capture (3/14)
DR의 LSA에 대한 Router #7의 Acknowledge
6
Area 0
0/0
192.168.3.9
192.168.2.6
DR LSA message의
sequence number
1
0/0
192.168.1.1
5
ABR
X
8
0/1
192.168.2.1
2611XM
ASBR
9
Area 2
ABR
Catalyst 2950
Switch
2611XM
7
192.168.2.7
DR
Catalyst 2950
Switch
0/0
192.168.3.13
13
ASBR
2611XM
17
2611XM
12
0/1
192.168.3.5
0/0
192.168.2.5
0/1
192.168.14.9
0/1
192.168.15.13
Switch #8 – packet capture (4/14)
DR의 LSA에 대한 Router #6의 Acknowledge
6
Area 0
0/0
192.168.3.9
192.168.2.6
DR - LSA message의
sequence number
Router #7의 ACK와 동일
1
0/0
192.168.1.1
5
ABR
X
8
0/1
192.168.2.1
2611XM
ASBR
9
Area 2
ABR
Catalyst 2950
Switch
2611XM
7
192.168.2.7
DR
Catalyst 2950
Switch
0/0
192.168.3.13
13
ASBR
2611XM
18
2611XM
12
0/1
192.168.3.5
0/0
192.168.2.5
0/1
192.168.14.9
0/1
192.168.15.13
Switch #8 – packet capture (5/14)
‘Area 1’과 link를 재연결했을 때
‘Area 1’과 link 재연결 시점
Router #1의
FastEthernet 0/1
Interface가
‘Down’ ‘Full’
state로 될 때 까지의
경과시간
6
Area 0
192.168.2.6
1
0/0
192.168.1.1
5
ABR
8
0/1
192.168.2.1
2611XM
0/0
192.168.2.5
0/1
192.168.3.5
DR
Catalyst 2950
Switch
2611XM
7
192.168.2.7
19
ABR
Switch #8 – packet capture (6/14)
Link 재연결 후 Router #1의 첫 번째 Hello packet
6
Area 0
192.168.2.6
// 자신의 존재, active neighbor를 알림
1
0/0
192.168.1.1
5
ABR
8
0/1
192.168.2.1
2611XM
0/0
192.168.2.5
0/1
192.168.3.5
DR
Catalyst 2950
Switch
2611XM
7
192.168.2.7
20
ABR
Switch #8 – packet capture (7/14)
DR(192.168.2.5)의 LSU message
// router가 자신이 속한 area에서 생성.
해당 area의 router link 상태를 설명
6
Area 0
192.168.2.6
1
// 192.168.1.1의 area(Area 1)에
연결 단계
0/0
192.168.1.1
5
ABR
8
0/1
192.168.2.1
2611XM
0/0
192.168.2.5
0/1
192.168.3.5
DR
Catalyst 2950
Switch
2611XM
7
192.168.2.7
21
ABR
Switch #8 – packet capture (8/14)
Router #1의 LSU message DR
// ABR이 이웃한 area의 정보를
알림
6
Area 0
192.168.2.6
1
0/0
192.168.1.1
5
ABR
8
0/1
192.168.2.1
2611XM
0/0
192.168.2.5
0/1
192.168.3.5
DR
Catalyst 2950
Switch
2611XM
7
192.168.2.7
22
ABR
Switch #8 – packet capture (9/14)
DR(Router #5)의 LSU message
// 170번 packet
// ABR이 이웃한 area의
정보를 알림
6
Area 0
192.168.2.6
1
0/0
192.168.1.1
5
ABR
8
0/1
192.168.2.1
2611XM
0/0
192.168.2.5
0/1
192.168.3.5
DR
Catalyst 2950
Switch
2611XM
7
192.168.2.7
23
ABR
Switch #8 – packet capture (10/14)
DR(Router #5)의 LSU message (attached router)
// MA OSPF에서 DR에 의해 생성.
해당 area에 연결된 router를 알림
6
Area 0
192.168.2.6
// 재연결된 Router #1
1
0/0
192.168.1.1
5
ABR
8
0/1
192.168.2.1
2611XM
0/0
192.168.2.5
0/1
192.168.3.5
DR
Catalyst 2950
Switch
2611XM
7
192.168.2.7
24
ABR
Switch #8 – packet capture (11/14)
Router #1의 LSU message
// router가 자신이 속한 area에서 생성.
해당 area의 router link 상태를 설명
6
Area 0
192.168.2.6
1
// 192.168.1.1의 area(Area 1)에
연결
0/0
192.168.1.1
5
ABR
8
0/1
192.168.2.1
2611XM
0/0
192.168.2.5
0/1
192.168.3.5
DR
Catalyst 2950
Switch
2611XM
7
192.168.2.7
25
ABR
Switch #8 – packet capture (12/14)
Router #1의 ACK
// 172번 packet
// 171번 packet
6
Area 0
192.168.2.6
1
0/0
192.168.1.1
5
ABR
8
0/1
192.168.2.1
2611XM
0/0
192.168.2.5
0/1
192.168.3.5
DR
Catalyst 2950
Switch
2611XM
7
192.168.2.7
26
ABR
Switch #8 – packet capture (13/14)
Router #6의 ACK
// 173번 packet
// 171번 packet
6
Area 0
192.168.2.6
1
0/0
192.168.1.1
5
ABR
8
0/1
192.168.2.1
// 172번
2611XM
0/0
192.168.2.5
0/1
192.168.3.5
DR
Catalyst 2950
Switch
2611XM
7
192.168.2.7
27
ABR
Switch #8 – packet capture (14/14)
Router #7의 ACK
// 173번 packet
// 171번 packet
6
Area 0
192.168.2.6
1
0/0
192.168.1.1
5
ABR
8
0/1
192.168.2.1
// 172번
2611XM
0/0
192.168.2.5
0/1
192.168.3.5
DR
Catalyst 2950
Switch
2611XM
7
192.168.2.7
28
ABR