使ったルータ
NEC IX3110 10.5.33 (2023.6.30 リリース)
IX ルータの初期設定
config を初期化した上で以下を入力
hostname おなまえ
timezone +09 00
! ter len 0 的なデフォルト設定
terminal default-length 0
terminal default-width 512
! シリアルの通信速度設定
terminal speed 38400
!
! ログの設定
logging buffered 131072
logging subsystem all warn
logging timestamp datetime
ip ufs-cache enable
!
! ssh の設定
username ix-admin password plain ix-admin administrator
service password-encryption
ssh-server ip enable
この辺りの設定は共通のため、以下では省略。
先ずは 2台でやってみる
LAN側のインターフェースは仮に Loopback にしておく。
ルータ間はセグメントが異なるので /32 でルーティングを書く。
RT-11
hostname RT-11
!
ip route 100.64.21.1/32 100.64.21.1 GigaEthernet0.0 connected
router bgp 40010
neighbor 100.64.21.1 remote-as 40020
address-family ipv4 unicast
network 10.0.11.0/24
!
interface GigaEthernet0.0
ip address 100.64.11.1/32
no shutdown
!
interface Loopback0.0
ip address 10.0.11.100/24
ip route 100.64.21.1/32 100.64.21.1 GigaEthernet0.0 connected Gi0.0 の先に 100.64.21.1 が直接繋がっている。
router bgp 40010 で、自分の AS 番号を定義
neighbor 100.64.21.1 remote-as 40020 隣接している AS 番号と、そのルータの IP アドレス
address-family ipv4 unicast の後に network 10.0.11.0/24 で、自分が接している (next-hop になる) ネットワークを BGP に広告。
RT-21
hostname RT-21
!
ip route 100.64.11.1/32 100.64.11.1 GigaEthernet0.0 connected
router bgp 40020
neighbor 100.64.11.1 remote-as 40010
address-family ipv4 unicast
network 10.0.21.0/24
!
interface GigaEthernet0.0
ip address 100.64.21.1/32
no shutdown
!
interface Loopback0.0
ip address 10.0.21.100/24
ip route 100.64.11.1/32 100.64.11.1 GigaEthernet0.0 connected Gi0.0 の先に 100.64.11.1 が直接繋がっている。
router bgp 40020 このルータの所属している AS 番号
neighbor 100.64.11.1 remote-as 40010 隣接している AS 番号と、そのルータの IP アドレス
address-family ipv4 unicast の中に network 10.0.21.0/24 を記載し、このルータに隣接しているネットワークを BGP で広告
RT-21 route
RT-21(config)# show ip route
IP Routing Table - 4 entries, 3 hidden, 2041 frees
Entries: 2 Connected, 1 Static, 0 RIP, 0 OSPF, 1 BGP
Codes: C - Connected, S - Static, R - RIP, 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, B - BGP
* - Candidate default, s - Summary
Timers: Age
10.0.0.0/8 is subnetted, 2 subnets
B 10.0.11.0/24 [20/0] via 100.64.11.1, GigaEthernet0.0, 0:29:56
C 10.0.21.0/24 [0/0] is directly connected, Loopback0.0, 0:31:04
100.0.0.0/8 is subnetted, 2 subnets
S 100.64.11.1/32 [1/1] via 100.64.11.1, GigaEthernet0.0, 0:30:54
C 100.64.21.1/32 [0/0] is directly connected, GigaEthernet0.0, 0:31:04
RT-21(config)# show ip bgp all
BGP table version is 2, local router ID is 10.0.21.100
Local AS number 40020
Status codes: s - suppressed, * - valid, h - history, l - looped
> - best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Path
*> 10.0.11.0/24 100.64.11.1 0 40010 i
*> 10.0.21.0/24 0.0.0.0 0 i
Total number of prefixes 2
RT-21(config)#
RT-21(config)# show ip bgp paths
Address RefCount Next Hop MED LocPrf Path
0x069a2180 2 0.0.0.0 0* 100 i
0x06a4ab00 4 100.64.11.1 0* 100 40010 i
0x06a4a940 1 100.64.21.1 0* 100 i
RT-21(config)#
RT-21(config)# show ip bgp 10.0.11.0/24
RIB entry for 10.0.11.0/24, table version 1
RIB-IN entry:
Received from neighbor 100.64.11.1 (10.0.11.100) 0:44:49 ago
Nexthop 100.64.11.1, Origin IGP, MED 0, Localpref 100
AS path 40010
External, Best, Valid
IGP protocol is static metric 1
Outgoing interface is GigaEthernet0.0 100.64.11.1
RT-21(config)# show ip bgp 10.0.21.0/24
RIB entry for 10.0.21.0/24, table version 0
RIB-IN entry:
Local originated 0:45:59 ago
Nexthop 0.0.0.0, Origin IGP, MED 0, Localpref 100
AS path local
Local, Best, Valid
RIB-OUT entry:
Advertised to neighbor 100.64.11.1 (10.0.11.100) 0:44:52 ago
Nexthop 100.64.21.1, Origin IGP, MED 0
AS path local
RT-21(config)#
RT-21 ping
RT-21(config)# ping 10.0.11.100 source 10.0.21.100
PING 10.0.21.100 > 10.0.11.100 56 data bytes
64 bytes from 10.0.11.100: icmp_seq=0 ttl=64 time=0.095 ms
64 bytes from 10.0.11.100: icmp_seq=1 ttl=64 time=0.078 ms
64 bytes from 10.0.11.100: icmp_seq=2 ttl=64 time=0.084 ms
64 bytes from 10.0.11.100: icmp_seq=3 ttl=64 time=0.081 ms
64 bytes from 10.0.11.100: icmp_seq=4 ttl=64 time=0.082 ms
--- 10.0.11.100 ping statistics ---
5 packets transmitted, 5 packets received, 0% packet loss
round-trip (ms) min/avg/max = 0.078/0.084/0.095
RT-21(config)#
ルータ 4台 AS 2つ
RT-11 は先程と同じ。RT-21 の 下に RT-22, RT-23 を接続し、BGP4 でルーティング。
RT-21,RT-22,RT-23 の間 (172.16.0.0/24) は HUB で繋ぎます。
RT-11
hostname RT-11
ip route 100.64.21.1/32 100.64.21.1 GigaEthernet0.0 connected
!
router bgp 65010
neighbor 100.64.21.1 remote-as 65020
address-family ipv4 unicast
network 10.0.11.0/24
!
interface GigaEthernet0.0
ip address 100.64.11.1/32
no shutdown
!
interface Loopback0.0
ip address 10.0.11.100/24
RT-21
hostname RT-21
ip route 100.64.11.1/32 100.64.11.1 GigaEthernet0.0 connected
!
router bgp 65020
neighbor 100.64.11.1 remote-as 65010
neighbor 172.16.0.22 remote-as 65020
neighbor 172.16.0.23 remote-as 65020
address-family ipv4 unicast
neighbor 172.16.0.22 next-hop-self
neighbor 172.16.0.23 next-hop-self
network 172.16.0.0/24
aggregate-address 172.17.22.0/23 summary-only
!
interface GigaEthernet0.0
ip address 100.64.21.1/32
no shutdown
!
interface GigaEthernet1.0
ip address 172.16.0.21/24
no shutdown
RT-22
router bgp 65020
neighbor 172.16.0.21 remote-as 65020
neighbor 172.16.0.23 remote-as 65020
address-family ipv4 unicast
network 172.17.22.0/24
!
interface GigaEthernet0.0
ip address 172.16.0.22/24
no shutdown
!
interface Loopback0.0
ip address 172.17.22.100/24
!
RT-22(config)#
RT-23
hostname RT-23
router bgp 65020
neighbor 172.16.0.21 remote-as 65020
neighbor 172.16.0.22 remote-as 65020
address-family ipv4 unicast
network 172.17.23.0/24
!
interface GigaEthernet0.0
ip address 172.16.0.23/24
no shutdown
!
interface Loopback0.0
ip address 172.17.23.100/24
RT-21 と、RT-22 を接続、RT-23 は未接続の状態と、接続後の状態。
RT-21(config)# sh ip bgp summary
BGP router ID 10.0.21.100, local AS number 40020
2 BGP AS-PATH entries
Neighbor V AS MsgRcvd MsgSent Up/DownTime State
100.64.11.1 4 40010 175 178 2:52:34 ESTABLISHED
172.16.0.22 4 40020 3 5 0:00:38 ESTABLISHED
172.16.0.23 4 40020 0 0 0:00:00 ACTIVE
RT-21(config)# sh ip bgp summary
BGP router ID 10.0.21.100, local AS number 40020
2 BGP AS-PATH entries
Neighbor V AS MsgRcvd MsgSent Up/DownTime State
100.64.11.1 4 40010 178 181 2:55:07 ESTABLISHED
172.16.0.22 4 40020 6 8 0:03:11 ESTABLISHED
172.16.0.23 4 40020 3 5 0:00:09 ESTABLISHED
RT-21(config)# show ip route
IP Routing Table - 7 entries, 5 hidden, 2036 frees
Entries: 2 Connected, 1 Static, 0 RIP, 0 OSPF, 4 BGP
Codes: C - Connected, S - Static, R - RIP, 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, B - BGP
* - Candidate default, s - Summary
Timers: Age
10.0.0.0/8 is subnetted, 1 subnets
B 10.0.11.0/24 [20/0] via 100.64.11.1, GigaEthernet0.0, 0:10:45
100.0.0.0/8 is subnetted, 2 subnets
S 100.64.11.1/32 [1/1] via 100.64.11.1, GigaEthernet0.0, 0:10:47
C 100.64.21.1/32 [0/0] is directly connected, GigaEthernet0.0, 0:10:47
172.16.0.0/16 is subnetted, 1 subnets
C 172.16.0.0/24 [0/0] is directly connected, GigaEthernet1.0, 0:05:13
172.17.0.0/16 is subnetted, 3 subnets
B s 172.17.22.0/23 [255/0] is directly connected, Null0.0, 0:05:13
B 172.17.22.0/24 [200/0] via 172.16.0.22, GigaEthernet1.0, 0:05:13
B 172.17.23.0/24 [200/0] via 172.16.0.23, GigaEthernet1.0, 0:02:11
RT-21 の next-hop-self がなかった場合
RT-21
router bgp 65020
neighbor 100.64.11.1 remote-as 65010
neighbor 172.16.0.22 remote-as 65020
neighbor 172.16.0.23 remote-as 65020
address-family ipv4 unicast
! neighbor 172.16.0.22 next-hop-self
! neighbor 172.16.0.23 next-hop-self
network 172.16.0.0/24
aggregate-address 172.17.22.0/23 summary-only
RT-23
RT-23(config)# show ip bgp summary
BGP router ID 172.17.23.100, local AS number 65020
2 BGP AS-PATH entries
Neighbor V AS MsgRcvd MsgSent Up/DownTime State
172.16.0.21 4 65020 40 31 0:14:33 ESTABLISHED
172.16.0.22 4 65020 30 33 0:04:34 ESTABLISHED
Total number of neighbors 2
RT-23(config)#
RT-23(config)# show ip route
IP Routing Table - 4 entries, 3 hidden, 2041 frees
Entries: 2 Connected, 0 Static, 0 RIP, 0 OSPF, 2 BGP
Codes: C - Connected, S - Static, R - RIP, 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, B - BGP
* - Candidate default, s - Summary
Timers: Age
172.16.0.0/16 is subnetted, 1 subnets
C 172.16.0.0/24 [0/0] is directly connected, GigaEthernet0.0, 0:07:03
172.17.0.0/16 is subnetted, 3 subnets
B 172.17.22.0/23 [200/0] via 172.16.0.21, GigaEthernet0.0, 0:07:01
B 172.17.22.0/24 [200/0] via 172.16.0.22, GigaEthernet0.0, 0:03:20
C 172.17.23.0/24 [0/0] is directly connected, Loopback0.0, 3:01:44
BGP は、RT-23 から RT-21 が見えていますが、RT-11 向けのルーティング (10.0.11.100/24) が来ていません。
一方で RT-11 はルーティングが来ています。(戻りがないため、通信はできません)
RT-11
RT-11(config)# show ip route
IP Routing Table - 5 entries, 5 hidden, 2038 frees
Entries: 2 Connected, 1 Static, 0 RIP, 0 OSPF, 2 BGP
Codes: C - Connected, S - Static, R - RIP, 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, B - BGP
* - Candidate default, s - Summary
Timers: Age
10.0.0.0/8 is subnetted, 1 subnets
C 10.0.11.0/24 [0/0] is directly connected, Loopback0.0, 6:07:33
100.0.0.0/8 is subnetted, 2 subnets
C 100.64.11.1/32 [0/0] is directly connected, GigaEthernet0.0, 3:19:01
S 100.64.21.1/32 [1/1] via 100.64.21.1, GigaEthernet0.0, 3:19:01
172.16.0.0/16 is subnetted, 1 subnets
B 172.16.0.0/24 [20/0] via 100.64.21.1, GigaEthernet0.0, 0:16:13
172.17.0.0/16 is subnetted, 1 subnets
B 172.17.22.0/23 [20/0] via 100.64.21.1, GigaEthernet0.0, 0:16:13
ここで、RT-21 に neighbor 172.16.0.X next-hop-self を投入します。
RT-21
RT-21(config)# router bgp 65020
RT-21(config-bgp)# address-family ipv4 unicast
RT-21(config-bgp-af4)# neighbor 172.16.0.22 next-hop-self
% Need to reset neighbor 172.16.0.22 to take effect of the command.
RT-21(config-bgp-af4)# neighbor 172.16.0.23 next-hop-self
% Need to reset neighbor 172.16.0.23 to take effect of the command.
RT-21(config-bgp-af4)# exi
RT-21(config-bgp)# exit
RT-21(config)#
反映させるには 172.16.0.22 (RT-22) と 172.16.0.23 (RT-23) をリセットしろと言われます。
勿論電源 OFF/ON でも良いのでしょうが、それぞれの機器で clear コマンドを叩きます。
RT-22(config)# clear ip bgp *
RT-23(config)# clear ip bgp *
一度接続が切れますので、暫く待ちます。
show ip bgp ...
RT-21(config)# show ip bgp
BGP table version is 32, local router ID is 172.16.0.21
Local AS number 65020
Status codes: s - suppressed, * - valid, h - history, l - looped
> - best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Path
*> 10.0.11.0/24 100.64.11.1 0 65010 i
*> 172.16.0.0/24 0.0.0.0 0 i
Total number of prefixes 2
RT-21(config)# show ip bgp summary
BGP router ID 172.16.0.21, local AS number 65020
2 BGP AS-PATH entries
Neighbor V AS MsgRcvd MsgSent Up/DownTime State
100.64.11.1 4 65010 51 62 0:47:51 ESTABLISHED
172.16.0.22 4 65020 49 63 0:01:04 IDLE
172.16.0.23 4 65020 49 60 0:00:59 IDLE
Total number of neighbors 3
いろいろやって待ってると接続が戻る。
show ip bgp ...
RT-21(config)# show ip bgp summary
BGP router ID 172.16.0.21, local AS number 65020
2 BGP AS-PATH entries
Neighbor V AS MsgRcvd MsgSent Up/DownTime State
100.64.11.1 4 65010 55 67 0:51:10 ESTABLISHED
172.16.0.22 4 65020 54 70 0:02:23 ESTABLISHED
172.16.0.23 4 65020 54 67 0:02:18 ESTABLISHED
Total number of neighbors 3
RT-21(config)#
3台とも ESTABLISHED になりました。
もう一度 RT-23 でルーティングを見てみると
RT-23
RT-23(config)# show ip bgp summary
BGP router ID 172.17.23.100, local AS number 65020
2 BGP AS-PATH entries
Neighbor V AS MsgRcvd MsgSent Up/DownTime State
172.16.0.21 4 65020 335 324 0:05:30 ESTABLISHED
172.16.0.22 4 65020 323 324 0:05:38 ESTABLISHED
Total number of neighbors 2
Neighbor は変化無し。
RT-23
RT-23(config)# show ip route
IP Routing Table - 5 entries, 4 hidden, 2039 frees
Entries: 2 Connected, 0 Static, 0 RIP, 0 OSPF, 3 BGP
Codes: C - Connected, S - Static, R - RIP, 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, B - BGP
* - Candidate default, s - Summary
Timers: Age
10.0.0.0/8 is subnetted, 1 subnets
B 10.0.11.0/24 [200/0] via 172.16.0.21, GigaEthernet0.0, 0:05:34
172.16.0.0/16 is subnetted, 1 subnets
C 172.16.0.0/24 [0/0] is directly connected, GigaEthernet0.0, 4:58:58
172.17.0.0/16 is subnetted, 3 subnets
B 172.17.22.0/23 [200/0] via 172.16.0.21, GigaEthernet0.0, 0:05:34
B 172.17.22.0/24 [200/0] via 172.16.0.22, GigaEthernet0.0, 0:05:42
C 172.17.23.0/24 [0/0] is directly connected, Loopback0.0, 7:53:38
10.0.11.0/24 のルーティングが来ました。
AS 内にルータ 4台
冗長性を考えれば RT-11 ↔ RT-14 を結ぶ必要もありますが、それがないとどうなるか。
RT-11
router bgp 65010
neighbor 100.64.0.1 remote-as 65010
neighbor 100.64.0.3 remote-as 65010
address-family ipv4 unicast
network 10.0.11.0/24
!
interface GigaEthernet0.0
ip address 100.64.0.0/31
no shutdown
!
interface GigaEthernet1.0
ip address 100.64.0.2/31
no shutdown
!
interface Loopback0.0
ip address 10.0.11.100/24
RT-12
router bgp 65010
neighbor 100.64.0.0 remote-as 65010
neighbor 100.64.0.5 remote-as 65010
neighbor 100.64.0.9 remote-as 65010
address-family ipv4 unicast
network 10.0.12.0/24
!
interface GigaEthernet0.0
ip address 100.64.0.1/31
no shutdown
!
interface GigaEthernet1.0
ip address 100.64.0.4/31
no shutdown
!
interface GigaEthernet2.0
ip address 100.64.0.8/31
no shutdown
!
interface Loopback0.0
ip address 10.0.12.100/24
RT-13
router bgp 65010
neighbor 100.64.0.2 remote-as 65010
neighbor 100.64.0.7 remote-as 65010
neighbor 100.64.0.8 remote-as 65010
address-family ipv4 unicast
network 10.0.13.0/24
!
interface GigaEthernet0.0
ip address 100.64.0.3/31
no shutdown
!
interface GigaEthernet1.0
ip address 100.64.0.6/31
no shutdown
!
interface GigaEthernet2.0
ip address 100.64.0.9/31
no shutdown
!
interface Loopback0.0
ip address 10.0.13.100/24
RT-14
router bgp 65010
neighbor 100.64.0.4 remote-as 65010
neighbor 100.64.0.6 remote-as 65010
address-family ipv4 unicast
network 10.0.14.0/24
!
interface GigaEthernet0.0
ip address 100.64.0.5/31
no shutdown
!
interface GigaEthernet1.0
ip address 100.64.0.7/31
no shutdown
!
interface Loopback0.0
ip address 10.0.14.100/24
show ip bgp summary
RT-11
RT-11(config)# show ip bgp summary
BGP router ID 10.0.11.100, local AS number 65010
1 BGP AS-PATH entries
Neighbor V AS MsgRcvd MsgSent Up/DownTime State
100.64.0.1 4 65010 21 21 0:18:54 ESTABLISHED
100.64.0.3 4 65010 16 18 0:10:27 ESTABLISHED
Total number of neighbors 2
RT-12
Neighbor V AS MsgRcvd MsgSent Up/DownTime State
100.64.0.0 4 65010 22 22 0:19:13 ESTABLISHED
100.64.0.5 4 65010 20 20 0:17:26 ESTABLISHED
100.64.0.9 4 65010 20 20 0:17:13 ESTABLISHED
RT-13
Neighbor V AS MsgRcvd MsgSent Up/DownTime State
100.64.0.2 4 65010 16 18 0:10:47 ESTABLISHED
100.64.0.7 4 65010 18 18 0:15:08 ESTABLISHED
100.64.0.8 4 65010 20 20 0:17:14 ESTABLISHED
RT-14
Neighbor V AS MsgRcvd MsgSent Up/DownTime State
100.64.0.4 4 65010 20 20 0:17:27 ESTABLISHED
100.64.0.6 4 65010 18 18 0:15:09 ESTABLISHED
全て接続完了
show ip route
RT-11
RT-11(config)# show ip route
...
Timers: Age
10.0.0.0/8 is subnetted, 3 subnets
C 10.0.11.0/24 [0/0] is directly connected, Loopback0.0, 0:25:48
B 10.0.12.0/24 [200/0] via 100.64.0.1, GigaEthernet0.0, 0:25:32
B 10.0.13.0/24 [200/0] via 100.64.0.3, GigaEthernet1.0, 0:17:06
100.0.0.0/8 is subnetted, 2 subnets
C 100.64.0.0/31 [0/0] is directly connected, GigaEthernet0.0, 0:25:48
C 100.64.0.2/31 [0/0] is directly connected, GigaEthernet1.0, 0:17:55
RT-11(config)#
RT-12
Timers: Age
10.0.0.0/8 is subnetted, 4 subnets
B 10.0.11.0/24 [200/0] via 100.64.0.0, GigaEthernet0.0, 0:25:39
C 10.0.12.0/24 [0/0] is directly connected, Loopback0.0, 0:25:48
B 10.0.13.0/24 [200/0] via 100.64.0.9, GigaEthernet2.0, 0:23:39
B 10.0.14.0/24 [200/0] via 100.64.0.5, GigaEthernet1.0, 0:23:51
100.0.0.0/8 is subnetted, 3 subnets
C 100.64.0.0/31 [0/0] is directly connected, GigaEthernet0.0, 0:25:48
C 100.64.0.4/31 [0/0] is directly connected, GigaEthernet1.0, 0:24:14
C 100.64.0.8/31 [0/0] is directly connected, GigaEthernet2.0, 0:23:44
RT-12(config)#
RT-13
Timers: Age
10.0.0.0/8 is subnetted, 4 subnets
B 10.0.11.0/24 [200/0] via 100.64.0.2, GigaEthernet0.0, 0:17:17
B 10.0.12.0/24 [200/0] via 100.64.0.8, GigaEthernet2.0, 0:23:44
C 10.0.13.0/24 [0/0] is directly connected, Loopback0.0, 0:25:47
B 10.0.14.0/24 [200/0] via 100.64.0.7, GigaEthernet1.0, 0:21:38
100.0.0.0/8 is subnetted, 3 subnets
C 100.64.0.2/31 [0/0] is directly connected, GigaEthernet0.0, 0:18:02
C 100.64.0.6/31 [0/0] is directly connected, GigaEthernet1.0, 0:22:56
C 100.64.0.8/31 [0/0] is directly connected, GigaEthernet2.0, 0:23:56
RT-13(config)#
RT-14
Timers: Age 10.0.0.0/8 is subnetted, 3 subnets
B 10.0.12.0/24 [200/0] via 100.64.0.4, GigaEthernet0.0, 0:24:04
B 10.0.13.0/24 [200/0] via 100.64.0.6, GigaEthernet1.0, 0:21:45
C 10.0.14.0/24 [0/0] is directly connected, Loopback0.0, 0:25:45
100.0.0.0/8 is subnetted, 2 subnets
C 100.64.0.4/31 [0/0] is directly connected, GigaEthernet0.0, 0:24:29
C 100.64.0.6/31 [0/0] is directly connected, GigaEthernet1.0, 0:23:07
RT-14(config)#
ルーティングが来ないので next-hop-self を入れてみる
RT-11 と RT-14 の間のルーティングがされていませんねぇ。
これはさっきの neighbor X.X.X.X next-hop-self がいるパターンでしょうか。
まず、中間の RT-12 の BGP 設定を以下のようにします。
RT-12
router bgp 65010
neighbor 100.64.0.0 remote-as 65010
neighbor 100.64.0.5 remote-as 65010
neighbor 100.64.0.9 remote-as 65010
address-family ipv4 unicast
neighbor 100.64.0.0 next-hop-self
neighbor 100.64.0.5 next-hop-self
neighbor 100.64.0.9 next-hop-self
network 10.0.12.0/24
RT-14
RT-14(config)# clear ip bgp *
RT-14(config)# show ip route
...
Timers: Age 10.0.0.0/8 is subnetted, 3 subnets
B 10.0.12.0/24 [200/0] via 100.64.0.4, GigaEthernet0.0, 0:01:52
B 10.0.13.0/24 [200/0] via 100.64.0.6, GigaEthernet1.0, 0:01:56
C 10.0.14.0/24 [0/0] is directly connected, Loopback0.0, 0:57:36
100.0.0.0/8 is subnetted, 2 subnets
C 100.64.0.4/31 [0/0] is directly connected, GigaEthernet0.0, 0:56:20
C 100.64.0.6/31 [0/0] is directly connected, GigaEthernet1.0, 0:54:58
RT-14(config)# show ip bgp neighbors 100.64.0.4 received-routes
BGP table version is 15, local router ID is 10.0.14.100
Local AS number 65010
Status codes: s - suppressed, * - valid, h - history, l - looped
> - best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Path
*>i10.0.12.0/24 100.64.0.4 0 100 i
Total number of prefixes 1
再接続されましたが、ルートは来ません。AS 内なので 'next-hop-self' では next-hop アドレスが書き換わりません。残念。
やはりルーティングが来ないのでルートリフレクタにする
BGP はそもそもフルメッシュであることを想定して作られたプロトコルなので、ルーティング情報が複数のルータを通過しないのです。(スプリットホライズン)
そのため、知っているルートを全て喋る「BGPルートリフレクタ」という機能でフルメッシュから、スター型でも動作可能になります。改めて以下のように書き換えます。
RT-12
router bgp 65010
neighbor 100.64.0.0 remote-as 65010
neighbor 100.64.0.0 route-reflector-client
neighbor 100.64.0.5 remote-as 65010
neighbor 100.64.0.5 route-reflector-client
neighbor 100.64.0.9 remote-as 65010
neighbor 100.64.0.9 route-reflector-client
address-family ipv4 unicast
network 10.0.12.0/24
このコマンドも % Need to reset neighbor X.X.X.X to take effect of the command. と言われるので
clear ip bgp * を実行...暫く待って
RT-14
RT-14(config)# show ip route
...
Timers: Age
10.0.0.0/8 is subnetted, 3 subnets
B 10.0.12.0/24 [200/0] via 100.64.0.4, GigaEthernet0.0, 0:00:14
B 10.0.13.0/24 [200/0] via 100.64.0.6, GigaEthernet1.0, 0:00:15
C 10.0.14.0/24 [0/0] is directly connected, Loopback0.0, 1:44:32
100.0.0.0/8 is subnetted, 2 subnets
C 100.64.0.4/31 [0/0] is directly connected, GigaEthernet0.0, 1:43:16
C 100.64.0.6/31 [0/0] is directly connected, GigaEthernet1.0, 1:41:54
ルーティングが追加されていませんねぇ。
RT-12 (100.64.0.4) から貰ったルートを見てみましょう。
RT-14
RT-14(config)# show ip bgp neighbors 100.64.0.4 received-routes
BGP table version is 13, local router ID is 10.0.14.100
Local AS number 65010
Status codes: s - suppressed, * - valid, h - history, l - looped
> - best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Path
i10.0.11.0/24 100.64.0.0 0 100 i
*>i10.0.12.0/24 100.64.0.4 0 100 i
i10.0.13.0/24 100.64.0.9 0 100 i
Total number of prefixes 3
ルートが 3つ来ていますが、 * - valid が 一つしか付いていないですねぇ。
Next Hop が Next でない所を向いている (直接接続していないアドレス) からみたいです。
Next Hop を書き換えたいので next-hop-self を入れてみる
Next Hop を RT-12 に書き換えます。
RT-12
no router bgp 65010
router bgp 65010
neighbor 100.64.0.0 remote-as 65010
neighbor 100.64.0.0 route-reflector-client
neighbor 100.64.0.5 remote-as 65010
neighbor 100.64.0.5 route-reflector-client
neighbor 100.64.0.9 remote-as 65010
neighbor 100.64.0.9 route-reflector-client
address-family ipv4 unicast
neighbor 100.64.0.0 next-hop-self
neighbor 100.64.0.5 next-hop-self
neighbor 100.64.0.9 next-hop-self
network 10.0.12.0/24
clear ip bgb * して見てみる
RT-14
RT-14(config)# show ip bgp neighbors 100.64.0.4 received-routes
BGP table version is 20, local router ID is 10.0.14.100
Local AS number 65010
Status codes: s - suppressed, * - valid, h - history, l - looped
> - best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Path
i10.0.11.0/24 100.64.0.0 0 100 i
*>i10.0.12.0/24 100.64.0.4 0 100 i
i10.0.13.0/24 100.64.0.9 0 100 i
Total number of prefixes 3
どうやら、同 AS 内の Next Hop の書き換えはできないようです。
Next Hop が書き換えられなかったので、RT-12 に所属しているネットワークだと宣言してみる
RT-12
no router bgp 65010
router bgp 65010
neighbor 100.64.0.0 remote-as 65010
neighbor 100.64.0.0 route-reflector-client
neighbor 100.64.0.5 remote-as 65010
neighbor 100.64.0.5 route-reflector-client
neighbor 100.64.0.9 remote-as 65010
neighbor 100.64.0.9 route-reflector-client
address-family ipv4 unicast
network 10.0.11.0/24
network 10.0.12.0/24
network 10.0.13.0/24
network 10.0.14.0/24
network コマンドで自分が所持しているネットワークだと経路情報を広告してみる。
RT-14
RT-14(config)# show ip bgp neighbors 100.64.0.4 received-routes
...
Network Next Hop Metric LocPrf Path
i10.0.11.0/24 100.64.0.0 0 100 i
*>i10.0.12.0/24 100.64.0.4 0 100 i
i10.0.13.0/24 100.64.0.9 0 100 i
やっぱり駄目ですねぇ。
NEC の IX ルータ で BGP をメッシュ構成にできないときは AS を分割しないといけないようです。
BGP コンフェデレーションは非対応なので、完全に分割しないといけません。
BGP コンフェデレーションの説明は ➡ IBGP スケーリングのための BGP コンフェデレーション
えーっと、マニュアルを見直しました。next-hop-self を peer-group の中で使うと上手くいきました。
そして 100.64.0.n を広告していませんでした。 RT-11,RT-13,RT14 は広告するアドレスを増やしただけですが、再掲します。
RT-11
router bgp 65010
neighbor 100.64.0.1 remote-as 65010
neighbor 100.64.0.3 remote-as 65010
address-family ipv4 unicast
network 10.0.11.0/24
network 100.64.0.0/31
network 100.64.0.2/31
!
interface GigaEthernet0.0
ip address 100.64.0.0/31
no shutdown
!
interface GigaEthernet1.0
ip address 100.64.0.2/31
no shutdown
!
interface Loopback0.0
ip address 10.0.11.100/24
100.64.0.0/31 を使っているので広告するアドレスも /31 にします。(ルーティングテーブルに /31 で載っていて、ルーティングテーブルに載っている物しか広告しないため)
RT-12
route-map in-comming permit 10
set metric 10
!
router bgp 65010
address-family ipv4 unicast
network 10.0.12.0/24
network 100.64.0.0/31
network 100.64.0.4/31
network 100.64.0.8/31
peer-group My-Home remote-as 65010
neighbor 100.64.0.0 remote-as 65010
neighbor 100.64.0.5 remote-as 65010
neighbor 100.64.0.9 remote-as 65010
route-reflector-client
address-family ipv4 next-hop-self
address-family ipv4 route-map in-comming in
!
interface GigaEthernet0.0
ip address 100.64.0.1/31
no shutdown
!
interface GigaEthernet1.0
ip address 100.64.0.4/31
no shutdown
!
interface GigaEthernet2.0
ip address 100.64.0.8/31
no shutdown
!
interface Loopback0.0
ip address 10.0.12.100/24
peer-group で My-Home という名前を付けて as 65010 のルータを括ります。
ここに next-hop-self を書くいても効いていないようなのですが、ルーティングテーブルに載せるときに良きに計らってくれるようです。
route-map で in-comming を定義して、BGP で入ってきた経路の metric を 10 にしています。(ルータの向こう側へ行くときにコストが追加されるように) できれば 10 加算するとかできると複数台経由してもコストが計算できて良い気がするのですが、できないみたい。
RT-13
router bgp 65010
neighbor 100.64.0.2 remote-as 65010
neighbor 100.64.0.7 remote-as 65010
neighbor 100.64.0.8 remote-as 65010
address-family ipv4 unicast
network 10.0.13.0/24
network 100.64.0.2/31
network 100.64.0.6/31
network 100.64.0.8/31
!
interface GigaEthernet0.0
ip address 100.64.0.3/31
no shutdown
!
interface GigaEthernet1.0
ip address 100.64.0.6/31
no shutdown
!
interface GigaEthernet2.0
ip address 100.64.0.9/31
no shutdown
!
interface Loopback0.0
ip address 10.0.13.100/24
RT-14
router bgp 65010
neighbor 100.64.0.4 remote-as 65010
neighbor 100.64.0.6 remote-as 65010
address-family ipv4 unicast
network 10.0.14.0/24
network 100.64.0.4/31
network 100.64.0.6/31
!
interface GigaEthernet0.0
ip address 100.64.0.5/31
no shutdown
!
interface GigaEthernet1.0
ip address 100.64.0.7/31
no shutdown
!
interface Loopback0.0
ip address 10.0.14.100/24
RT-11
RT-11(config)# show ip route
IP Routing Table - 9 entries, 3 hidden, 2036 frees
Entries: 3 Connected, 0 Static, 0 RIP, 0 OSPF, 6 BGP
Codes: C - Connected, S - Static, R - RIP, 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, B - BGP
* - Candidate default, s - Summary
Timers: Age
10.0.0.0/8 is subnetted, 4 subnets
C 10.0.11.0/24 [0/0] is directly connected, Loopback0.0, 0:12:05
B 10.0.12.0/24 [200/0] via 100.64.0.1, GigaEthernet0.0, 0:24:13
B 10.0.13.0/24 [200/10] via 100.64.0.1, GigaEthernet0.0, 0:24:13
B 10.0.14.0/24 [200/10] via 100.64.0.1, GigaEthernet0.0, 0:24:13
100.0.0.0/8 is subnetted, 5 subnets
C 100.64.0.0/31 [0/0] is directly connected, GigaEthernet0.0, 2:05:55
C 100.64.0.2/31 [0/0] is directly connected, GigaEthernet1.0, 2:05:55
B 100.64.0.4/31 [200/0] via 100.64.0.1, GigaEthernet0.0, 0:24:14
B 100.64.0.6/31 [200/10] via 100.64.0.1, GigaEthernet0.0, 0:24:13
B 100.64.0.8/31 [200/0] via 100.64.0.1, GigaEthernet0.0, 0:24:14
RT-11(config)# ping 10.0.11.100 count 2
PING 10.0.11.100 > 10.0.11.100 56 data bytes
64 bytes from 10.0.11.100: icmp_seq=0 ttl=64 time=0.023 ms
64 bytes from 10.0.11.100: icmp_seq=1 ttl=64 time=0.017 ms
--- 10.0.11.100 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip (ms) min/avg/max = 0.017/0.020/0.023
RT-11(config)# ping 10.0.12.100 count 2
PING 100.64.0.0 > 10.0.12.100 56 data bytes
64 bytes from 10.0.12.100: icmp_seq=0 ttl=64 time=0.093 ms
64 bytes from 10.0.12.100: icmp_seq=1 ttl=64 time=0.082 ms
--- 10.0.12.100 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip (ms) min/avg/max = 0.082/0.087/0.093
RT-11(config)# ping 10.0.13.100 count 2
PING 100.64.0.0 > 10.0.13.100 56 data bytes
64 bytes from 10.0.13.100: icmp_seq=0 ttl=64 time=0.131 ms
64 bytes from 10.0.13.100: icmp_seq=1 ttl=64 time=0.108 ms
--- 10.0.13.100 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip (ms) min/avg/max = 0.108/0.119/0.131
RT-11(config)# ping 10.0.14.100 count 2
PING 100.64.0.0 > 10.0.14.100 56 data bytes
64 bytes from 10.0.14.100: icmp_seq=0 ttl=63 time=0.144 ms
64 bytes from 10.0.14.100: icmp_seq=1 ttl=63 time=0.112 ms
--- 10.0.14.100 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip (ms) min/avg/max = 0.112/0.128/0.144
RT-11(config)#
RT-11(config)# traceroute 10.0.14.100 source 10.0.11.100
TRACEROUTE 10.0.14.100 56 data bytes
1 100.64.0.1 0 ms 0 ms 0 ms
2 10.0.14.100 0 ms 0 ms 0 ms
RT-11(config)#
RT-14
RT-14(config)# show ip route
IP Routing Table - 9 entries, 3 hidden, 2036 frees
Entries: 3 Connected, 0 Static, 0 RIP, 0 OSPF, 6 BGP
Codes: C - Connected, S - Static, R - RIP, 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, B - BGP
* - Candidate default, s - Summary
Timers: Age
10.0.0.0/8 is subnetted, 4 subnets
B 10.0.11.0/24 [200/10] via 100.64.0.4, GigaEthernet0.0, 0:06:35
B 10.0.12.0/24 [200/0] via 100.64.0.4, GigaEthernet0.0, 0:18:46
B 10.0.13.0/24 [200/10] via 100.64.0.4, GigaEthernet0.0, 0:18:45
C 10.0.14.0/24 [0/0] is directly connected, Loopback0.0, 2:00:32
100.0.0.0/8 is subnetted, 5 subnets
B 100.64.0.0/31 [200/0] via 100.64.0.4, GigaEthernet0.0, 0:18:46
B 100.64.0.2/31 [200/10] via 100.64.0.4, GigaEthernet0.0, 0:18:46
C 100.64.0.4/31 [0/0] is directly connected, GigaEthernet0.0, 0:59:45
C 100.64.0.6/31 [0/0] is directly connected, GigaEthernet1.0, 2:00:15
B 100.64.0.8/31 [200/0] via 100.64.0.4, GigaEthernet0.0, 0:18:46
RT-14(config)#
RT-14(config)# traceroute 10.0.11.100 source 10.0.14.100
TRACEROUTE 10.0.11.100 56 data bytes
1 100.64.0.4 0 ms 0 ms 0 ms
2 10.0.11.100 0 ms 0 ms 0 ms
RT-14(config)# traceroute 10.0.12.100 source 10.0.14.100
TRACEROUTE 10.0.12.100 56 data bytes
1 10.0.12.100 0 ms 0 ms 0 ms
RT-14(config)# traceroute 10.0.13.100 source 10.0.14.100
TRACEROUTE 10.0.13.100 56 data bytes
1 100.64.0.4 0 ms 0 ms 0 ms
2 10.0.13.100 0 ms 0 ms 0 ms
RT-14(config)#
状態をいろいろと。
RT-12
RT-12(config)# show ip bgp summary
BGP router ID 10.0.12.100, local AS number 65010
Cluster ID 10.0.12.100(167775332)
1 BGP AS-PATH entries
Neighbor V AS MsgRcvd MsgSent Up/DownTime State
100.64.0.0 4 65010 11 12 0:07:45 ESTABLISHED
100.64.0.5 4 65010 10 13 0:07:45 ESTABLISHED
100.64.0.9 4 65010 10 13 0:07:46 ESTABLISHED
Total number of neighbors 3
RT-12(config)#
RT-12(config)# show ip bgp neighbors 100.64.0.5 advertised-routes
BGP table version is 10, local router ID is 10.0.12.100
Local AS number 65010, local cluster ID is 10.0.12.100(167775332)
Status codes: s - suppressed, * - valid, h - history, l - looped
> - best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Path
*> 10.0.12.0/24 100.64.0.4 0 100 i
*>i10.0.13.0/24 100.64.0.9 10 100 i
*> 100.64.0.0/31 100.64.0.4 0 100 i
*>i100.64.0.2/31 100.64.0.0 10 100 i
*> 100.64.0.4/31 100.64.0.4 0 100 i
*>i100.64.0.6/31 100.64.0.9 10 100 i
*> 100.64.0.8/31 100.64.0.4 0 100 i
Total number of prefixes 7
RT-12(config)# show ip bgp neighbors 100.64.0.0 received-routes
BGP table version is 10, local router ID is 10.0.12.100
Local AS number 65010, local cluster ID is 10.0.12.100(167775332)
Status codes: s - suppressed, * - valid, h - history, l - looped
> - best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Path
* i100.64.0.0/31 100.64.0.0 10 100 i
*>i100.64.0.2/31 100.64.0.0 10 100 i
Total number of prefixes 2
RT-12(config)# show ip bgp neighbors 100.64.0.0 advertised-routes
BGP table version is 10, local router ID is 10.0.12.100
Local AS number 65010, local cluster ID is 10.0.12.100(167775332)
Status codes: s - suppressed, * - valid, h - history, l - looped
> - best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Path
*> 10.0.12.0/24 100.64.0.1 0 100 i
*>i10.0.13.0/24 100.64.0.9 10 100 i
*>i10.0.14.0/24 100.64.0.5 10 100 i
*> 100.64.0.0/31 100.64.0.1 0 100 i
*> 100.64.0.4/31 100.64.0.1 0 100 i
*>i100.64.0.6/31 100.64.0.9 10 100 i
*> 100.64.0.8/31 100.64.0.1 0 100 i
Total number of prefixes 7
RT-12(config)#
RT-12(config)# show ip route
IP Routing Table - 8 entries, 3 hidden, 2037 frees
Entries: 4 Connected, 0 Static, 0 RIP, 0 OSPF, 4 BGP
Codes: C - Connected, S - Static, R - RIP, 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, B - BGP
* - Candidate default, s - Summary
Timers: Age
10.0.0.0/8 is subnetted, 3 subnets
C 10.0.12.0/24 [0/0] is directly connected, Loopback0.0, 1:50:15
B 10.0.13.0/24 [200/10] via 100.64.0.9, GigaEthernet2.0, 0:08:21
B 10.0.14.0/24 [200/10] via 100.64.0.5, GigaEthernet1.0, 0:08:21
100.0.0.0/8 is subnetted, 5 subnets
C 100.64.0.0/31 [0/0] is directly connected, GigaEthernet0.0, 1:49:58
B 100.64.0.2/31 [200/10] via 100.64.0.0, GigaEthernet0.0, 0:08:21
C 100.64.0.4/31 [0/0] is directly connected, GigaEthernet1.0, 0:49:23
B 100.64.0.6/31 [200/10] via 100.64.0.9, GigaEthernet2.0, 0:08:22
C 100.64.0.8/31 [0/0] is directly connected, GigaEthernet2.0, 1:49:59
RT-14
RT-14(config)# show ip bgp summary
BGP router ID 10.0.14.100, local AS number 65010
1 BGP AS-PATH entries
Neighbor V AS MsgRcvd MsgSent Up/DownTime State
100.64.0.4 4 65010 107 93 0:15:58 ESTABLISHED
100.64.0.6 4 65010 93 95 0:59:27 ESTABLISHED
Total number of neighbors 2
RT-14(config)#
RT-14(config)# show ip bgp neighbors 100.64.0.4 received-routes
BGP table version is 55, local router ID is 10.0.14.100
Local AS number 65010
Status codes: s - suppressed, * - valid, h - history, l - looped
> - best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Path
*>i10.0.11.0/24 100.64.0.0 10 100 i
*>i10.0.12.0/24 100.64.0.4 0 100 i
*>i10.0.13.0/24 100.64.0.9 10 100 i
*>i100.64.0.0/31 100.64.0.4 0 100 i
*>i100.64.0.2/31 100.64.0.0 10 100 i
* i100.64.0.4/31 100.64.0.4 0 100 i
* i100.64.0.6/31 100.64.0.9 10 100 i
*>i100.64.0.8/31 100.64.0.4 0 100 i
Total number of prefixes 8
RT-14(config)#
RT-14(config)# show ip bgp neighbors 100.64.0.4 advertised-routes
BGP table version is 55, local router ID is 10.0.14.100
Local AS number 65010
Status codes: s - suppressed, * - valid, h - history, l - looped
> - best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Path
*> 10.0.14.0/24 100.64.0.5 0 100 i
*> 100.64.0.4/31 100.64.0.5 0 100 i
*> 100.64.0.6/31 100.64.0.5 0 100 i
Total number of prefixes 3
RT-14(config)#
RT-14(config)# show ip bgp neighbors 100.64.0.6 received-routes
BGP table version is 55, local router ID is 10.0.14.100
Local AS number 65010
Status codes: s - suppressed, * - valid, h - history, l - looped
> - best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Path
* i10.0.13.0/24 100.64.0.6 0 100 i
* i100.64.0.2/31 100.64.0.6 0 100 i
* i100.64.0.6/31 100.64.0.6 0 100 i
* i100.64.0.8/31 100.64.0.6 0 100 i
Total number of prefixes 4
RT-14(config)#
RT-14(config)# show ip route
IP Routing Table - 9 entries, 3 hidden, 2036 frees
Entries: 3 Connected, 0 Static, 0 RIP, 0 OSPF, 6 BGP
Codes: C - Connected, S - Static, R - RIP, 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, B - BGP
* - Candidate default, s - Summary
Timers: Age
10.0.0.0/8 is subnetted, 4 subnets
B 10.0.11.0/24 [200/10] via 100.64.0.4, GigaEthernet0.0, 0:06:35
B 10.0.12.0/24 [200/0] via 100.64.0.4, GigaEthernet0.0, 0:18:46
B 10.0.13.0/24 [200/10] via 100.64.0.4, GigaEthernet0.0, 0:18:45
C 10.0.14.0/24 [0/0] is directly connected, Loopback0.0, 2:00:32
100.0.0.0/8 is subnetted, 5 subnets
B 100.64.0.0/31 [200/0] via 100.64.0.4, GigaEthernet0.0, 0:18:46
B 100.64.0.2/31 [200/10] via 100.64.0.4, GigaEthernet0.0, 0:18:46
C 100.64.0.4/31 [0/0] is directly connected, GigaEthernet0.0, 0:59:45
C 100.64.0.6/31 [0/0] is directly connected, GigaEthernet1.0, 2:00:15
B 100.64.0.8/31 [200/0] via 100.64.0.4, GigaEthernet0.0, 0:18:46
RT-14(config)#
RT-11
RT-11(config)# show ip bgp summary
BGP router ID 10.0.11.100, local AS number 65010
1 BGP AS-PATH entries
Neighbor V AS MsgRcvd MsgSent Up/DownTime State
100.64.0.1 4 65010 103 94 0:12:28 ESTABLISHED
100.64.0.3 4 65010 91 94 0:55:58 ESTABLISHED
Total number of neighbors 2
RT-11(config)#
RT-11(config)# show ip route
IP Routing Table - 9 entries, 3 hidden, 2036 frees
Entries: 3 Connected, 0 Static, 0 RIP, 0 OSPF, 6 BGP
Codes: C - Connected, S - Static, R - RIP, 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, B - BGP
* - Candidate default, s - Summary
Timers: Age
10.0.0.0/8 is subnetted, 4 subnets
C 10.0.11.0/24 [0/0] is directly connected, Loopback0.0, 0:00:39
B 10.0.12.0/24 [200/0] via 100.64.0.1, GigaEthernet0.0, 0:12:47
B 10.0.13.0/24 [200/10] via 100.64.0.1, GigaEthernet0.0, 0:12:47
B 10.0.14.0/24 [200/10] via 100.64.0.1, GigaEthernet0.0, 0:12:47
100.0.0.0/8 is subnetted, 5 subnets
C 100.64.0.0/31 [0/0] is directly connected, GigaEthernet0.0, 1:54:29
C 100.64.0.2/31 [0/0] is directly connected, GigaEthernet1.0, 1:54:29
B 100.64.0.4/31 [200/0] via 100.64.0.1, GigaEthernet0.0, 0:12:48
B 100.64.0.6/31 [200/10] via 100.64.0.1, GigaEthernet0.0, 0:12:47
B 100.64.0.8/31 [200/0] via 100.64.0.1, GigaEthernet0.0, 0:12:48
RT-11(config)#
本番環境であれば RT-12 が壊れると終わりなので、RT-13 もルートリフレクタにして RT-12 とクラスタを組む必要があるらしい。