{"id":519,"date":"2018-04-18T23:06:00","date_gmt":"2018-04-18T14:06:00","guid":{"rendered":"https:\/\/wp.zassoul.com\/?p=519"},"modified":"2018-04-18T23:06:00","modified_gmt":"2018-04-18T14:06:00","slug":"ospf-dr%e3%81%a8bdr%e3%81%ae%e8%a9%b1","status":"publish","type":"post","link":"https:\/\/wp.zassoul.com\/?p=519","title":{"rendered":"[OSPF] DR\u3068BDR\u306e\u8a71"},"content":{"rendered":"

\u6700\u8fd1\u306b\u306a\u3063\u3066OSPF\u3067DR\u306b\u95a2\u3059\u308b\u8a8d\u8b58\u304c\u9593\u9055\u3048\u3066\u3044\u305f\u3053\u3068\u306b\u6c17\u304c\u3064\u3044\u305f\u3002<\/p>\n

\u3068\u3044\u3046\u3053\u3068\u3067\u30e1\u30e2\u3002<\/div>\n
<\/div>\n
\u4f55\u304b\u3068\u3044\u3046\u3068, DR\u304c\u843d\u3061\u308b\u3068BDR\u304cDR\u306b\u6607\u683c\u3055\u308c\u308b\u307e\u3067\u306e\u9593, \u305d\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5185\u3067\u306f\u30eb\u30fc\u30c8\u304c\u6d88\u5931\u3059\u308b\u3068\u3044\u3046\u3053\u3068\u3002<\/div>\n
\u6b63\u76f4, BDR\u304cDB\u4fdd\u6301\u3057\u3066\u3044\u308b\u306e\u3067\u30cd\u30a4\u30d0\u30fc\u306f\u305d\u308c\u3092\u5373\u6642\u5f15\u304d\u7d99\u3050\u3082\u306e\u3060\u3068\u601d\u3063\u3066\u3044\u305f\u3002<\/div>\n
\u3057\u304b\u3057, \u3068\u3042\u308b\u74b0\u5883\u3067\u300c\u306a\u30fc\u3093\u304b\u30e1\u30a4\u30f3\u306e\u7d4c\u8def\u3058\u3083\u306a\u3044\u30eb\u30fc\u30bf\u304c\u843d\u3061\u3066Ping\u30ed\u30b9\u30c8\u3059\u308b\u306a\u30fc\u300d\u306a\u3093\u3066\u601d\u3063\u3066\u8abf\u3079\u3066\u3044\u3066, \u308f\u304b\u3063\u305f\u306e\u304c\u3053\u308c\u3002\u25ef\u5341\u5e74\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30a8\u30f3\u30b8\u30cb\u30a2\u3084\u3063\u3066\u3044\u305f\u3051\u3069, \u3053\u306e\u6319\u52d5\u306f\u5168\u304f\u77e5\u306a\u304b\u3063\u305f\u3057\u610f\u8b58\u3057\u305f\u3053\u3068\u3082\u306a\u304b\u3063\u305f\u3002\u300c\u969c\u5bb3\u30dd\u30a4\u30f3\u30c8\u306b\u3088\u3063\u3066\u306f\u53ce\u675f\u306b\u6642\u9593\u304c\u304b\u304b\u308b\u5834\u5408\u304c\u3042\u308b\u3088\u306a\u300d\u304f\u3089\u3044\u306e\u8a8d\u8b58\u3067\u3057\u305f\u3002
\u307e\u3060\u307e\u3060\u77e5\u3089\u306a\u3044\u3053\u3068\u3070\u304b\u308a\u3002<\/div>\n
<\/div>\n
OSPF v2\u306eRFC\u300chttps:\/\/www.ietf.org\/rfc\/rfc2328.txt<\/a>\u300d\u306b\u3082\u66f8\u3044\u3066\u3042\u308a\u307e\u3057\u305f\u3002<\/div>\n
Section 2 of this document discusses the directed graph
        representation of an area.  Router nodes are labelled with their
        Router ID.  Transit network nodes are actually labelled with the
        IP address of their Designated Router.  It follows that when the
        Designated Router changes, it appears as if the network node on
        the graph is replaced by an entirely new node.  This will cause
        the network and all its attached routers to originate new LSAs.
        Until the link-state databases again converge, some temporary
        loss of connectivity may result.<\/span>  This may result in ICMP
        unreachable messages being sent in response to data traffic.
        For that reason, the Designated Router should change only
        infrequently.  Router Priorities should be configured so that
        the most dependable router on a network eventually becomes
        Designated Router.
<\/pre>\n
\u6539\u3081\u3066\u691c\u8a3c\u3057\u3066\u307f\u308b\u3002
\u30eb\u30fc\u30bf3\u53f0\u3067OSPF\u3092\u7d44\u3080\u30b7\u30f3\u30d7\u30eb\u306a\u69cb\u6210\u3002
PC1\u304b\u3089PC2\u306e\u7d4c\u8def\u306fRouter1\uff5eRouter2\u3068\u306a\u308b\u3088\u3046\u306bOSPF\u306e\u30b3\u30b9\u30c8\u3092\u8abf\u6574\u3059\u308b\u3002\u305d\u306e\u4e0a\u3067, Router 1\u306ePriority\u30920\u306b\u3057\u3066DR\u9078\u51fa\u304b\u3089\u5916\u3057, 2\u306ePriority\u309250, 3\u306ePriority\u3092100\u306b\u3059\u308b\u3002\u3053\u308c\u3067, \u901a\u4fe1\u7d4c\u8def\u306fRouter2\u3092\u30e1\u30a4\u30f3\u3068\u3059\u308b\u304c, DR\u306fRouter3\u306b\u306a\u308b\u3002<\/p>\n
<\/a><\/div>\n
\u6b63\u5e38\u6642\u306eshow ip ospf ne\u3068show ip ro \u306e\u51fa\u529b\u7d50\u679c\u3002\u8a2d\u5b9a\u3069\u304a\u308a\u3002<\/p>\n
Router1\u306e\u30cd\u30a4\u30d0\u30fc <\/p>\n
IOU1#sh ip ospf ne

Neighbor ID     Pri   State           Dead Time   Address         Interface
192.168.3.2      50   FULL\/BDR        00:00:35    192.168.2.2     Ethernet0\/0
192.168.3.3     100   FULL\/DR         00:00:31    192.168.2.3     Ethernet0\/0

IOU1#sh ip route 
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is not set

      192.168.1.0\/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.1.0\/24 is directly connected, Ethernet0\/1
L        192.168.1.1\/32 is directly connected, Ethernet0\/1
      192.168.2.0\/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.2.0\/24 is directly connected, Ethernet0\/0
L        192.168.2.1\/32 is directly connected, Ethernet0\/0
O     192.168.3.0\/24 [110\/110] via 192.168.2.2, 00:10:35, Ethernet0\/0

<\/pre>\n
Router 2\u306e\u30cd\u30a4\u30d0\u30fc<\/p>\n
IOU2#sh ip ospf ne
Neighbor ID     Pri   State           Dead Time   Address         Interface
192.168.2.1       0   FULL\/DROTHER    00:00:33    192.168.2.1     Ethernet0\/0
192.168.3.3     100   FULL\/DR         00:00:35    192.168.2.3     Ethernet0\/0
<\/pre>\n
IOU2#sh ip route 
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is not set

O     192.168.1.0\/24 [110\/110] via 192.168.2.1, 00:11:53, Ethernet0\/0
      192.168.2.0\/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.2.0\/24 is directly connected, Ethernet0\/0
L        192.168.2.2\/32 is directly connected, Ethernet0\/0
      192.168.3.0\/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.3.0\/24 is directly connected, Ethernet0\/1
L        192.168.3.2\/32 is directly connected, Ethernet0\/1

<\/pre>\n
Router 3\u306e\u30cd\u30a4\u30d0\u30fc<\/p>\n
IOU3#sh ip ospf
*Apr 18 07:04:07.804: %SYS-5-CONFIG_I: Configured from console by console
IOU3#sh ip ospf ne

Neighbor ID     Pri   State           Dead Time   Address         Interface
192.168.2.1       0   FULL\/DROTHER    00:00:38    192.168.2.1     Ethernet0\/0
192.168.3.2      50   FULL\/BDR        00:00:34    192.168.2.2     Ethernet0\/0
<\/pre>\n
IOU3#sh ip route 
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is not set

O     192.168.1.0\/24 [110\/210] via 192.168.2.1, 00:12:06, Ethernet0\/0
      192.168.2.0\/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.2.0\/24 is directly connected, Ethernet0\/0
L        192.168.2.3\/32 is directly connected, Ethernet0\/0
      192.168.3.0\/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.3.0\/24 is directly connected, Ethernet0\/1
L        192.168.3.3\/32 is directly connected, Ethernet0\/1
<\/pre>\n
\u3068, \u3053\u3053\u307e\u3067\u3084\u3063\u3066Cisco\u3067\u306f\u53ce\u675f\u304c\u65e9\u304f\u3066\u4e8b\u8c61\u304c\u51fa\u306a\u3044\u3002 \u305f\u307e\u306bPing\u30ed\u30b9\u30c8\u8d77\u304d\u308b\u3051\u3069\u3053\u308cOSPF\u95a2\u4fc2\u306a\u3044\u3084\u3064\u3060\u3002  <\/p>\n
Debug\u3068\u3063\u3066\u307f\u305f\u3089\u30b3\u30f3\u30de\u6570\u79d2\u3067\u5207\u308a\u66ff\u308f\u3063\u3066\u3044\u305f\u306e\u3067Cisco\u306f\u3088\u304f\u51fa\u6765\u3066\u3044\u308b\u3068\u3044\u3046\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3057\u305f\u3002<\/p>\n
\n
\u3068\u3044\u3046\u3053\u3068\u3067VyOS\u3067\u691c\u8a3c\u3002 <\/p>\n
<\/a><\/div>\n
VyOS\u3067\u306fBDR\u304c\u3044\u306a\u304f\u306a\u308b\u3068\u30eb\u30fc\u30c8\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3057\u306a\u3044\u3068\u3044\u3046\u30d0\u30b0\u3089\u3057\u304d\u6319\u52d5\u3092\u3059\u308b\u306e\u3067\u69cb\u6210\u306f\u3061\u3087\u3063\u3068\u5909\u3048\u305f\u3002<\/p>\n
VyOS1\u306e\u30b9\u30c6\u30fc\u30bf\u30b9\u3002VyOS3\u304cDR\u3067VyOS2\u304cBDR\u3002PC2\u3078\u306e\u5b9b\u5148\u306fVyOS2\u306b\u5411\u3044\u3066\u3044\u308b\u3002\u306a\u304a, Hello\u306f5\u79d2\u3002Dead\u306f15\u79d2\u306b\u3057\u305f\u3002<\/p>\n
vyos1@vyos:~$ sh ip ospf ne

    Neighbor ID Pri State           Dead Time Address         Interface                 RXmtL RqstL DBsmL
10.10.20.2       50 Full\/Backup       11.994s 10.10.10.2      eth0:10.10.10.1               0     0     0
10.10.10.3      100 Full\/DR           10.991s 10.10.10.3      eth0:10.10.10.1               0     0     0
vyos@vyos:~$ sh ip route 
Codes: K - kernel route, C - connected, S - static, R - RIP, O - OSPF,
       I - ISIS, B - BGP, > - selected route, * - FIB route

O   10.10.10.0\/24 [110\/10] is directly connected, eth0, 00:17:16
C>* 10.10.10.0\/24 is directly connected, eth0
O>* 10.10.20.0\/24 [110\/30] via 10.10.10.2, eth0, 00:00:08
O>* 10.10.30.0\/24 [110\/40] via 10.10.10.2, eth0, 00:00:08
C>* 127.0.0.0\/8 is directly connected, lo
O   192.168.1.0\/24 [110\/10] is directly connected, eth3, 00:17:16
C>* 192.168.1.0\/24 is directly connected, eth3
O>* 192.168.2.0\/24 [110\/40] via 10.10.10.2, eth0, 00:00:08
<\/pre>\n
\u3053\u306e\u6642\u70b9\u3067, PC1\u304b\u3089PC2\u3078\u306e\u7d4c\u8def\u306fVyOS1\uff5eVyOS2\uff5eVyOS4<\/b>\u3068\u306a\u3063\u3066\u3044\u308b\u3002VyOS3\u306f\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u30e9\u30a4\u30f3\u3068\u306a\u3063\u3066\u3044\u308b\u3002
\u3053\u3053\u3067, \u901a\u4fe1\u306b\u5f71\u97ff\u306e\u7121\u3044\u306f\u305a\u306eVyOS3(DR)\u306e\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u3092Disable\u306b\u3059\u308b\u3002
VyOS3 <\/p>\n
vyos3@vyos# set interfaces ethernet eth0 disable
[edit]
vyos@vyos# commit
[edit]
vyos@vyos# 

<\/pre>\n
VyOS1 <\/p>\n
vyos1@vyos:~$ sh ip ro
Codes: K - kernel route, C - connected, S - static, R - RIP, O - OSPF,
       I - ISIS, B - BGP, > - selected route, * - FIB route

C>* 10.10.10.0\/24 is directly connected, eth0
C>* 127.0.0.0\/8 is directly connected, lo
O   192.168.1.0\/24 [110\/10] is directly connected, eth3, 00:33:43
C>* 192.168.1.0\/24 is directly connected, eth3
vyos@vyos:~$ 
vyos@vyos:~$ sh ip ospf ne

    Neighbor ID Pri State           Dead Time Address         Interface            RXmtL RqstL DBsmL
10.10.20.2       50 Full\/DR           14.753s 10.10.10.2      eth0:10.10.10.1          1     0     0
<\/pre>\n
Ping\u306e\u72b6\u614b\u306f\u3068\u3044\u3046\u3068\u30fb\u30fb\u30fb\u3002  <\/p>\n
84 bytes from 192.168.2.10 icmp_seq=136 ttl=61 time=4.304 ms
84 bytes from 192.168.2.10 icmp_seq=137 ttl=61 time=5.105 ms
*192.168.1.1 icmp_seq=138 ttl=64 time=0.999 ms (ICMP type:3, code:0, Destination network unreachable)
*192.168.1.1 icmp_seq=139 ttl=64 time=0.832 ms (ICMP type:3, code:0, Destination network unreachable)
*192.168.1.1 icmp_seq=140 ttl=64 time=0.925 ms (ICMP type:3, code:0, Destination network unreachable)
*192.168.1.1 icmp_seq=141 ttl=64 time=1.416 ms (ICMP type:3, code:0, Destination network unreachable)
192.168.2.10 icmp_seq=142 timeout
*192.168.1.1 icmp_seq=143 ttl=64 time=1.184 ms (ICMP type:3, code:0, Destination network unreachable)
192.168.2.10 icmp_seq=144 timeout
*192.168.1.1 icmp_seq=145 ttl=64 time=1.185 ms (ICMP type:3, code:0, Destination network unreachable)
192.168.2.10 icmp_seq=146 timeout
*192.168.1.1 icmp_seq=147 ttl=64 time=1.224 ms (ICMP type:3, code:0, Destination network unreachable)
192.168.2.10 icmp_seq=148 timeout
*192.168.1.1 icmp_seq=149 ttl=64 time=0.886 ms (ICMP type:3, code:0, Destination network unreachable)
192.168.2.10 icmp_seq=150 timeout
192.168.2.10 icmp_seq=151 timeout
192.168.2.10 icmp_seq=152 timeout
84 bytes from 192.168.2.10 icmp_seq=153 ttl=61 time=3.531 ms

<\/pre>\n
16\u79d2\u307b\u3069\u30d1\u30b1\u30ed\u30b9\u3057\u3066\u3044\u305f\u3002
VyOS\u306a\u306e\u3067, DR\u304c\u5207\u308a\u66ff\u308f\u3063\u3066BDR\u304c\u9078\u51fa\u3055\u308c\u308b\u307e\u3067\u306e\u9593\u304c\u901a\u4fe1\u65ad\u306b\u306a\u3063\u3066\u3044\u308b\u3068\u601d\u308f\u308c\u308b\u3002<\/p>\n
OSPF\u306e\u4ed5\u69d8\u3068\u3044\u3046\u3053\u3068\u3067\u3057\u3087\u3046\u304c\u306a\u3044\u306e\u304b\u3082\u3057\u308c\u306a\u3044\u304c, \u30a2\u30af\u30c6\u30a3\u30d6\u306a\u30eb\u30fc\u30c8\u306b\u95a2\u4fc2\u306a\u3044\u3068\u3053\u308d\u3067DR\u304c\u843d\u3061\u308b\u3068\u5f71\u97ff\u51fa\u308b\u3068\u3044\u3046\u306e\u306f\u8a2d\u8a08\u6642\u306b\u306f\u8981\u6ce8\u610f\u3067\u3059\u306d\u3002
\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u306e\u8ca0\u8377\u304c\u5c0f\u3055\u3044\u306e\u3067\u3042\u308c\u3070, \u30a4\u30fc\u30b5\u30cd\u30c3\u30c8\u3067\u3082Point-to-Multipoint\u306b\u3057\u305f\u65b9\u304c\u826f\u3044\u306e\u3067\u306f\u306a\u3044\u304b\u3068\u601d\u3044\u307e\u3057\u305f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6700\u8fd1\u306b\u306a\u3063\u3066OSPF\u3067DR\u306b\u95a2\u3059\u308b\u8a8d\u8b58\u304c\u9593\u9055\u3048\u3066\u3044\u305f\u3053\u3068\u306b\u6c17\u304c\u3064\u3044\u305f\u3002 \u3068\u3044\u3046\u3053\u3068\u3067\u30e1\u30e2\u3002 \u4f55\u304b\u3068\u3044\u3046\u3068, DR\u304c\u843d\u3061\u308b\u3068BDR\u304cDR\u306b\u6607\u683c\u3055\u308c\u308b\u307e\u3067\u306e\u9593, \u305d\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5185\u3067\u306f\u30eb\u30fc\u30c8\u304c\u6d88\u5931\u3059\u308b\u3068\u3044\u3046\u3053\u3068\u3002 \u6b63\u76f4, B\u2026 \u7d9a\u304d\u3092\u8aad\u3080 »<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,6,15,52,41],"tags":[],"class_list":["post-519","post","type-post","status-publish","format-standard","hentry","category-cisco","category-it","category-network","category-ospf","category-vyos"],"_links":{"self":[{"href":"https:\/\/wp.zassoul.com\/index.php?rest_route=\/wp\/v2\/posts\/519","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wp.zassoul.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wp.zassoul.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wp.zassoul.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.zassoul.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=519"}],"version-history":[{"count":0,"href":"https:\/\/wp.zassoul.com\/index.php?rest_route=\/wp\/v2\/posts\/519\/revisions"}],"wp:attachment":[{"href":"https:\/\/wp.zassoul.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=519"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wp.zassoul.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=519"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wp.zassoul.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=519"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}