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Re: 問題ID:1174

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Re: 問題ID:1174

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arashi1977

居住地: 広島投稿数: 1715

l03a さんの言われるとおり、提示されていない情報についてはデフォルトであるとみなして通常は問題ないですよ。

それだけだとあれなので、実際どうなるのかやってみました。
図にある通りの情報だけで実装してみます。
RA:

interface FastEthernet0/0
 ip address 192.168.1.2 255.255.255.0
 duplex auto
 speed auto
!
router ospf 1
 log-adjacency-changes
 network 192.168.1.0 0.0.0.255 area 0

RB:

interface FastEthernet0/0
 ip address 192.168.1.1 255.255.255.0
 duplex auto
 speed auto
!
router ospf 1
 log-adjacency-changes
 network 192.168.1.0 0.0.0.255 area 0

RC:

interface FastEthernet0/1
 ip address 192.168.1.3 255.255.255.0
 duplex auto
 speed auto
!
router ospf 1
 log-adjacency-changes
 network 192.168.1.0 0.0.0.255 area 0

この結果
RA:

RA#show ip ospf neighbor
               ここ！
                 ↓
Neighbor ID     Pri   State           Dead Time   Address         Interface
192.168.1.1       1   FULL/DROTHER    00:00:32    192.168.1.1     FastEthernet0/0
192.168.1.3       1   FULL/DR         00:00:31    192.168.1.3     FastEthernet0/0
RA#show ip ospf interface fa0/0
FastEthernet0/0 is up, line protocol is up
  Internet Address 192.168.1.2/24, Area 0
  Process ID 1, Router ID 192.168.1.2, Network Type BROADCAST, Cost: 10
  Transmit Delay is 1 sec, State BDR, Priority 1 ← ここ！
  Designated Router (ID) 192.168.1.3, Interface address 192.168.1.3
  Backup Designated router (ID) 192.168.1.2, Interface address 192.168.1.2
  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
    oob-resync timeout 40
    Hello due in 00:00:03
  Supports Link-local Signaling (LLS)
  Index 1/1, flood queue length 0
  Next 0x0(0)/0x0(0)
  Last flood scan length is 0, maximum is 1
  Last flood scan time is 4 msec, maximum is 4 msec
  Neighbor Count is 2, Adjacent neighbor count is 2
    Adjacent with neighbor 192.168.1.1
    Adjacent with neighbor 192.168.1.3  (Designated Router)
  Suppress hello for 0 neighbor(s)

RB:

RB#show ip ospf neighbor
               ここ！
                 ↓
Neighbor ID     Pri   State           Dead Time   Address         Interface
192.168.1.2       1   FULL/BDR        00:00:38    192.168.1.2     FastEthernet0/0
192.168.1.3       1   FULL/DR         00:00:39    192.168.1.3     FastEthernet0/0
RB#show ip ospf interface fa0/0
FastEthernet0/0 is up, line protocol is up
  Internet Address 192.168.1.1/24, Area 0
  Process ID 1, Router ID 192.168.1.1, Network Type BROADCAST, Cost: 10
  Transmit Delay is 1 sec, State DROTHER, Priority 1 ← ここ！
  Designated Router (ID) 192.168.1.3, Interface address 192.168.1.3
  Backup Designated router (ID) 192.168.1.2, Interface address 192.168.1.2
  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
    oob-resync timeout 40
    Hello due in 00:00:05
  Supports Link-local Signaling (LLS)
  Index 1/1, flood queue length 0
  Next 0x0(0)/0x0(0)
  Last flood scan length is 0, maximum is 1
  Last flood scan time is 4 msec, maximum is 4 msec
  Neighbor Count is 2, Adjacent neighbor count is 2
    Adjacent with neighbor 192.168.1.2  (Backup Designated Router)
    Adjacent with neighbor 192.168.1.3  (Designated Router)
  Suppress hello for 0 neighbor(s)

RC:

RC#show ip ospf neighbor
               ここ！
                 ↓
Neighbor ID     Pri   State           Dead Time   Address         Interface
192.168.1.1       1   FULL/DROTHER    00:00:38    192.168.1.1     FastEthernet0/1
192.168.1.2       1   FULL/BDR        00:00:37    192.168.1.2     FastEthernet0/1
RC#show ip ospf interface fa0/1
FastEthernet0/1 is up, line protocol is up
  Internet Address 192.168.1.3/24, Area 0
  Process ID 1, Router ID 192.168.1.3, Network Type BROADCAST, Cost: 10
  Transmit Delay is 1 sec, State DR, Priority 1 ← ここ！
  Designated Router (ID) 192.168.1.3, Interface address 192.168.1.3
  Backup Designated router (ID) 192.168.1.2, Interface address 192.168.1.2
  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
    oob-resync timeout 40
    Hello due in 00:00:04
  Supports Link-local Signaling (LLS)
  Index 1/1, flood queue length 0
  Next 0x0(0)/0x0(0)
  Last flood scan length is 1, maximum is 1
  Last flood scan time is 0 msec, maximum is 4 msec
  Neighbor Count is 2, Adjacent neighbor count is 2
    Adjacent with neighbor 192.168.1.1
    Adjacent with neighbor 192.168.1.2  (Backup Designated Router)
  Suppress hello for 0 neighbor(s)

こうなります。
出力結果に示した通り、priorityについては未設定だとデフォルトで「１」となります。なので「未知」なのではなく「1である」と意識していただければよいかと思います

投稿ツリー

問題ID:1174 (QWEDEU, 2013-9-21 15:07)
- Re: 問題ID:1174 (l03a, 2013-9-24 5:23)
- Re: 問題ID:1174 (arashi1977, 2013-9-25 10:13)

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