BGP Confederationの確認
こんにちは！
今回は、前回構築した『BGP Confederation』を使用したNWの状態を確認していきます。
◆前回記事
shirase96476559.hatenablog.com
１．構成図と設計（再掲）
下記の通りでした。
２．BGPテーブル
まずはRT1~6のBGPテーブルを見てみます。
Pathの欄には、括弧表記がありますが、これがBGP Confederation内部では経由してきたサブASであることを意味します。
RT1#sh ip bgp
BGP table version is 9, local router ID is 1.1.1.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
t secondary path,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 1.1.1.1/32 0.0.0.0 0 32768 i
r>i 2.2.2.2/32 2.2.2.2 0 100 0 i
r>i 3.3.3.3/32 3.3.3.3 0 100 0 i
r>i 4.4.4.4/32 2.2.2.2 0 100 0 (456) i
r>i 5.5.5.5/32 3.3.3.3 0 100 0 (456) i
r>i 6.6.6.6/32 2.2.2.2 0 100 0 (456) i
*>i 7.7.7.7/32 2.2.2.2 0 100 0 ?
*>i 8.8.8.8/32 2.2.2.2 0 100 0 (456) ?RT2#sh ip bgp
BGP table version is 11, local router ID is 2.2.2.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
t secondary path,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
r>i 1.1.1.1/32 1.1.1.1 0 100 0 i
*> 2.2.2.2/32 0.0.0.0 0 32768 i
r>i 3.3.3.3/32 3.3.3.3 0 100 0 i
r> 4.4.4.4/32 4.4.4.4 0 100 0 (456) i
r 5.5.5.5/32 4.4.4.4 0 100 0 (456) i
r>i 3.3.3.3 0 100 0 (456) i
r> 6.6.6.6/32 4.4.4.4 0 100 0 (456) i
*> 7.7.7.7/32 10.1.27.7 0 32768 ?
*> 8.8.8.8/32 4.4.4.4 0 100 0 (456) ?RT3#sh ip bgp
BGP table version is 9, local router ID is 3.3.3.3
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
t secondary path,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
r>i 1.1.1.1/32 1.1.1.1 0 100 0 i
r>i 2.2.2.2/32 2.2.2.2 0 100 0 i
*> 3.3.3.3/32 0.0.0.0 0 32768 i
r 4.4.4.4/32 5.5.5.5 0 100 0 (456) i
r>i 2.2.2.2 0 100 0 (456) i
r> 5.5.5.5/32 5.5.5.5 0 100 0 (456) i
r 6.6.6.6/32 5.5.5.5 0 100 0 (456) i
r>i 2.2.2.2 0 100 0 (456) i
*>i 7.7.7.7/32 2.2.2.2 0 100 0 ?
* 8.8.8.8/32 5.5.5.5 0 100 0 (456) ?
*>i 2.2.2.2 0 100 0 (456) ?RT4#sh ip bgp
BGP table version is 13, local router ID is 4.4.4.4
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
t secondary path,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
r i 1.1.1.1/32 5.5.5.5 0 100 0 (123) i
r> 2.2.2.2 0 100 0 (123) i
r i 2.2.2.2/32 5.5.5.5 0 100 0 (123) i
r> 2.2.2.2 0 100 0 (123) i
r i 3.3.3.3/32 5.5.5.5 0 100 0 (123) i
r> 2.2.2.2 0 100 0 (123) i
*> 4.4.4.4/32 0.0.0.0 0 32768 i
r>i 5.5.5.5/32 5.5.5.5 0 100 0 i
r>i 6.6.6.6/32 6.6.6.6 0 100 0 i
* i 7.7.7.7/32 5.5.5.5 0 100 0 (123) ?
*> 2.2.2.2 0 100 0 (123) ?
*>i 8.8.8.8/32 6.6.6.6 0 100 0 ?RT5#sh ip bgp
BGP table version is 13, local router ID is 5.5.5.5
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
t secondary path,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
r i 1.1.1.1/32 4.4.4.4 0 100 0 (123) i
r> 3.3.3.3 0 100 0 (123) i
r i 2.2.2.2/32 4.4.4.4 0 100 0 (123) i
r> 3.3.3.3 0 100 0 (123) i
r i 3.3.3.3/32 4.4.4.4 0 100 0 (123) i
r> 3.3.3.3 0 100 0 (123) i
r>i 4.4.4.4/32 4.4.4.4 0 100 0 i
*> 5.5.5.5/32 0.0.0.0 0 32768 i
r>i 6.6.6.6/32 6.6.6.6 0 100 0 i
* i 7.7.7.7/32 4.4.4.4 0 100 0 (123) ?
*> 3.3.3.3 0 100 0 (123) ?
*>i 8.8.8.8/32 6.6.6.6 0 100 0 ?RT6#sh ip bgp
BGP table version is 11, local router ID is 6.6.6.6
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
t secondary path,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
r i 1.1.1.1/32 5.5.5.5 0 100 0 (123) i
r>i 4.4.4.4 0 100 0 (123) i
r i 2.2.2.2/32 5.5.5.5 0 100 0 (123) i
r>i 4.4.4.4 0 100 0 (123) i
r>i 3.3.3.3/32 4.4.4.4 0 100 0 (123) i
r i 5.5.5.5 0 100 0 (123) i
r>i 4.4.4.4/32 4.4.4.4 0 100 0 i
r>i 5.5.5.5/32 5.5.5.5 0 100 0 i
*> 6.6.6.6/32 0.0.0.0 0 32768 i
* i 7.7.7.7/32 5.5.5.5 0 100 0 (123) ?
*>i 4.4.4.4 0 100 0 (123) ?
*> 8.8.8.8/32 10.1.68.8 0 32768 ?ここで一つ疑問が出てきます。
例えば、RT3の下記部分。対向サブASからの経路ですが、学習プロトコルはeBGPでしょうか？iBGPでしょうか？
r 6.6.6.6/32 5.5.5.5 0 100 0 (456) i r>i 2.2.2.2 0 100 0 (456) i
３．ルーティングテーブル
正解はiBGPです。（そもそもBGP Cenfederationの目的がiBGPピア数を減らすことなので当然と言われれば当然ですね）
ルーティングテーブルを見てみます。
注目すべきは、対向AS側のループバックのプロトコルを見るとOSPFとなっていることです。
見た目やコンフィグにはeBGPで学習していそうですが、OSPFがベストになっていることから、AD値から逆算して考えるとiBGPで学習したと考えることができます。（AD値：eBGP=20,OSPF=110,iBGP=200）
RT1#sh ip route | b Gate
Gateway of last resort is not set
1.0.0.0/32 is subnetted, 1 subnets
C 1.1.1.1 is directly connected, Loopback0
2.0.0.0/32 is subnetted, 1 subnets
O 2.2.2.2 [110/2] via 10.1.12.2, 00:33:09, GigabitEthernet0/0
3.0.0.0/32 is subnetted, 1 subnets
O 3.3.3.3 [110/2] via 10.1.13.3, 00:32:10, GigabitEthernet0/1
4.0.0.0/32 is subnetted, 1 subnets
O 4.4.4.4 [110/3] via 10.1.12.2, 00:30:51, GigabitEthernet0/0
5.0.0.0/32 is subnetted, 1 subnets
O 5.5.5.5 [110/3] via 10.1.13.3, 00:30:27, GigabitEthernet0/1
6.0.0.0/32 is subnetted, 1 subnets
O 6.6.6.6 [110/4] via 10.1.13.3, 00:29:35, GigabitEthernet0/1
[110/4] via 10.1.12.2, 00:29:35, GigabitEthernet0/0
7.0.0.0/32 is subnetted, 1 subnets
B 7.7.7.7 [200/0] via 2.2.2.2, 00:18:44
8.0.0.0/32 is subnetted, 1 subnets
B 8.8.8.8 [200/0] via 2.2.2.2, 00:16:03
10.0.0.0/8 is variably subnetted, 10 subnets, 2 masks
C 10.1.12.0/24 is directly connected, GigabitEthernet0/0
L 10.1.12.1/32 is directly connected, GigabitEthernet0/0
C 10.1.13.0/24 is directly connected, GigabitEthernet0/1
L 10.1.13.1/32 is directly connected, GigabitEthernet0/1
O 10.1.23.0/24 [110/2] via 10.1.13.3, 00:32:00, GigabitEthernet0/1
[110/2] via 10.1.12.2, 00:33:09, GigabitEthernet0/0
O 10.1.24.0/24 [110/2] via 10.1.12.2, 00:33:09, GigabitEthernet0/0
O 10.1.35.0/24 [110/2] via 10.1.13.3, 00:32:10, GigabitEthernet0/1
O 10.1.45.0/24 [110/3] via 10.1.13.3, 00:30:17, GigabitEthernet0/1
[110/3] via 10.1.12.2, 00:30:51, GigabitEthernet0/0
O 10.1.46.0/24 [110/3] via 10.1.12.2, 00:30:51, GigabitEthernet0/0
O 10.1.56.0/24 [110/3] via 10.1.13.3, 00:30:27, GigabitEthernet0/1RT2#sh ip route | b Gate
Gateway of last resort is not set
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/2] via 10.1.12.1, 00:34:39, GigabitEthernet0/0
2.0.0.0/32 is subnetted, 1 subnets
C 2.2.2.2 is directly connected, Loopback0
3.0.0.0/32 is subnetted, 1 subnets
O 3.3.3.3 [110/2] via 10.1.23.3, 00:33:34, GigabitEthernet0/1
4.0.0.0/32 is subnetted, 1 subnets
O 4.4.4.4 [110/2] via 10.1.24.4, 00:32:35, GigabitEthernet0/2
5.0.0.0/32 is subnetted, 1 subnets
O 5.5.5.5 [110/3] via 10.1.24.4, 00:31:51, GigabitEthernet0/2
[110/3] via 10.1.23.3, 00:32:01, GigabitEthernet0/1
6.0.0.0/32 is subnetted, 1 subnets
O 6.6.6.6 [110/3] via 10.1.24.4, 00:31:09, GigabitEthernet0/2
7.0.0.0/32 is subnetted, 1 subnets
S 7.7.7.7 [1/0] via 10.1.27.7
8.0.0.0/32 is subnetted, 1 subnets
B 8.8.8.8 [200/0] via 4.4.4.4, 00:09:11
10.0.0.0/8 is variably subnetted, 13 subnets, 2 masks
C 10.1.12.0/24 is directly connected, GigabitEthernet0/0
L 10.1.12.2/32 is directly connected, GigabitEthernet0/0
O 10.1.13.0/24 [110/2] via 10.1.23.3, 00:33:34, GigabitEthernet0/1
[110/2] via 10.1.12.1, 00:34:39, GigabitEthernet0/0
C 10.1.23.0/24 is directly connected, GigabitEthernet0/1
L 10.1.23.2/32 is directly connected, GigabitEthernet0/1
C 10.1.24.0/24 is directly connected, GigabitEthernet0/2
L 10.1.24.2/32 is directly connected, GigabitEthernet0/2
C 10.1.27.0/24 is directly connected, GigabitEthernet0/3
L 10.1.27.2/32 is directly connected, GigabitEthernet0/3
O 10.1.35.0/24 [110/2] via 10.1.23.3, 00:33:34, GigabitEthernet0/1
O 10.1.45.0/24 [110/2] via 10.1.24.4, 00:32:35, GigabitEthernet0/2
O 10.1.46.0/24 [110/2] via 10.1.24.4, 00:32:35, GigabitEthernet0/2
O 10.1.56.0/24 [110/3] via 10.1.24.4, 00:31:51, GigabitEthernet0/2
[110/3] via 10.1.23.3, 00:32:01, GigabitEthernet0/1RT3#sh ip route | b Gate
Gateway of last resort is not set
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/2] via 10.1.13.1, 00:41:07, GigabitEthernet0/0
2.0.0.0/32 is subnetted, 1 subnets
O 2.2.2.2 [110/2] via 10.1.23.2, 00:40:57, GigabitEthernet0/1
3.0.0.0/32 is subnetted, 1 subnets
C 3.3.3.3 is directly connected, Loopback0
4.0.0.0/32 is subnetted, 1 subnets
O 4.4.4.4 [110/3] via 10.1.35.5, 00:39:11, GigabitEthernet0/2
[110/3] via 10.1.23.2, 00:39:45, GigabitEthernet0/1
5.0.0.0/32 is subnetted, 1 subnets
O 5.5.5.5 [110/2] via 10.1.35.5, 00:39:21, GigabitEthernet0/2
6.0.0.0/32 is subnetted, 1 subnets
O 6.6.6.6 [110/3] via 10.1.35.5, 00:38:28, GigabitEthernet0/2
7.0.0.0/32 is subnetted, 1 subnets
B 7.7.7.7 [200/0] via 2.2.2.2, 00:27:37
8.0.0.0/32 is subnetted, 1 subnets
B 8.8.8.8 [200/0] via 2.2.2.2, 00:24:56
10.0.0.0/8 is variably subnetted, 11 subnets, 2 masks
O 10.1.12.0/24 [110/2] via 10.1.23.2, 00:40:57, GigabitEthernet0/1
[110/2] via 10.1.13.1, 00:41:07, GigabitEthernet0/0
C 10.1.13.0/24 is directly connected, GigabitEthernet0/0
L 10.1.13.3/32 is directly connected, GigabitEthernet0/0
C 10.1.23.0/24 is directly connected, GigabitEthernet0/1
L 10.1.23.3/32 is directly connected, GigabitEthernet0/1
O 10.1.24.0/24 [110/2] via 10.1.23.2, 00:40:57, GigabitEthernet0/1
C 10.1.35.0/24 is directly connected, GigabitEthernet0/2
L 10.1.35.3/32 is directly connected, GigabitEthernet0/2
O 10.1.45.0/24 [110/2] via 10.1.35.5, 00:39:11, GigabitEthernet0/2
O 10.1.46.0/24 [110/3] via 10.1.35.5, 00:39:11, GigabitEthernet0/2
[110/3] via 10.1.23.2, 00:39:45, GigabitEthernet0/1
O 10.1.56.0/24 [110/2] via 10.1.35.5, 00:39:21, GigabitEthernet0/2RT4#sh ip route | B b Gate
Gateway of last resort is not set
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/3] via 10.1.24.2, 00:35:20, GigabitEthernet0/0
2.0.0.0/32 is subnetted, 1 subnets
O 2.2.2.2 [110/2] via 10.1.24.2, 00:35:20, GigabitEthernet0/0
3.0.0.0/32 is subnetted, 1 subnets
O 3.3.3.3 [110/3] via 10.1.45.5, 00:34:38, GigabitEthernet0/1
[110/3] via 10.1.24.2, 00:35:20, GigabitEthernet0/0
4.0.0.0/32 is subnetted, 1 subnets
C 4.4.4.4 is directly connected, Loopback0
5.0.0.0/32 is subnetted, 1 subnets
O 5.5.5.5 [110/2] via 10.1.45.5, 00:34:38, GigabitEthernet0/1
6.0.0.0/32 is subnetted, 1 subnets
O 6.6.6.6 [110/2] via 10.1.46.6, 00:33:54, GigabitEthernet0/2
7.0.0.0/32 is subnetted, 1 subnets
B 7.7.7.7 [200/0] via 2.2.2.2, 00:20:52
8.0.0.0/32 is subnetted, 1 subnets
B 8.8.8.8 [200/0] via 6.6.6.6, 00:20:22
10.0.0.0/8 is variably subnetted, 11 subnets, 2 masks
O 10.1.12.0/24 [110/2] via 10.1.24.2, 00:35:20, GigabitEthernet0/0
O 10.1.13.0/24 [110/3] via 10.1.45.5, 00:34:38, GigabitEthernet0/1
[110/3] via 10.1.24.2, 00:35:20, GigabitEthernet0/0
O 10.1.23.0/24 [110/2] via 10.1.24.2, 00:35:20, GigabitEthernet0/0
C 10.1.24.0/24 is directly connected, GigabitEthernet0/0
L 10.1.24.4/32 is directly connected, GigabitEthernet0/0
O 10.1.35.0/24 [110/2] via 10.1.45.5, 00:34:38, GigabitEthernet0/1
C 10.1.45.0/24 is directly connected, GigabitEthernet0/1
L 10.1.45.4/32 is directly connected, GigabitEthernet0/1
C 10.1.46.0/24 is directly connected, GigabitEthernet0/2
L 10.1.46.4/32 is directly connected, GigabitEthernet0/2
O 10.1.56.0/24 [110/2] via 10.1.46.6, 00:33:54, GigabitEthernet0/2
[110/2] via 10.1.45.5, 00:34:38, GigabitEthernet0/1RT5#sh ip route | b Gate
Gateway of last resort is not set
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/3] via 10.1.35.3, 00:37:56, GigabitEthernet0/0
2.0.0.0/32 is subnetted, 1 subnets
O 2.2.2.2 [110/3] via 10.1.45.4, 00:37:46, GigabitEthernet0/1
[110/3] via 10.1.35.3, 00:37:56, GigabitEthernet0/0
3.0.0.0/32 is subnetted, 1 subnets
O 3.3.3.3 [110/2] via 10.1.35.3, 00:37:56, GigabitEthernet0/0
4.0.0.0/32 is subnetted, 1 subnets
O 4.4.4.4 [110/2] via 10.1.45.4, 00:37:46, GigabitEthernet0/1
5.0.0.0/32 is subnetted, 1 subnets
C 5.5.5.5 is directly connected, Loopback0
6.0.0.0/32 is subnetted, 1 subnets
O 6.6.6.6 [110/2] via 10.1.56.6, 00:36:59, GigabitEthernet0/2
7.0.0.0/32 is subnetted, 1 subnets
B 7.7.7.7 [200/0] via 3.3.3.3, 00:21:39
8.0.0.0/32 is subnetted, 1 subnets
B 8.8.8.8 [200/0] via 6.6.6.6, 00:22:57
10.0.0.0/8 is variably subnetted, 11 subnets, 2 masks
O 10.1.12.0/24 [110/3] via 10.1.45.4, 00:37:46, GigabitEthernet0/1
[110/3] via 10.1.35.3, 00:37:56, GigabitEthernet0/0
O 10.1.13.0/24 [110/2] via 10.1.35.3, 00:37:56, GigabitEthernet0/0
O 10.1.23.0/24 [110/2] via 10.1.35.3, 00:37:56, GigabitEthernet0/0
O 10.1.24.0/24 [110/2] via 10.1.45.4, 00:37:46, GigabitEthernet0/1
C 10.1.35.0/24 is directly connected, GigabitEthernet0/0
L 10.1.35.5/32 is directly connected, GigabitEthernet0/0
C 10.1.45.0/24 is directly connected, GigabitEthernet0/1
L 10.1.45.5/32 is directly connected, GigabitEthernet0/1
O 10.1.46.0/24 [110/2] via 10.1.56.6, 00:36:59, GigabitEthernet0/2
[110/2] via 10.1.45.4, 00:37:46, GigabitEthernet0/1
C 10.1.56.0/24 is directly connected, GigabitEthernet0/2
L 10.1.56.5/32 is directly connected, GigabitEthernet0/2RT6#sh ip route | b Gate
Gateway of last resort is not set
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/4] via 10.1.56.5, 00:35:17, GigabitEthernet0/1
[110/4] via 10.1.46.4, 00:35:17, GigabitEthernet0/0
2.0.0.0/32 is subnetted, 1 subnets
O 2.2.2.2 [110/3] via 10.1.46.4, 00:35:17, GigabitEthernet0/0
3.0.0.0/32 is subnetted, 1 subnets
O 3.3.3.3 [110/3] via 10.1.56.5, 00:35:17, GigabitEthernet0/1
4.0.0.0/32 is subnetted, 1 subnets
O 4.4.4.4 [110/2] via 10.1.46.4, 00:35:17, GigabitEthernet0/0
5.0.0.0/32 is subnetted, 1 subnets
O 5.5.5.5 [110/2] via 10.1.56.5, 00:35:17, GigabitEthernet0/1
6.0.0.0/32 is subnetted, 1 subnets
C 6.6.6.6 is directly connected, Loopback0
7.0.0.0/32 is subnetted, 1 subnets
B 7.7.7.7 [200/0] via 4.4.4.4, 00:22:20
8.0.0.0/32 is subnetted, 1 subnets
S 8.8.8.8 [1/0] via 10.1.68.8
10.0.0.0/8 is variably subnetted, 12 subnets, 2 masks
O 10.1.12.0/24 [110/3] via 10.1.46.4, 00:35:17, GigabitEthernet0/0
O 10.1.13.0/24 [110/3] via 10.1.56.5, 00:35:17, GigabitEthernet0/1
O 10.1.23.0/24 [110/3] via 10.1.56.5, 00:35:17, GigabitEthernet0/1
[110/3] via 10.1.46.4, 00:35:17, GigabitEthernet0/0
O 10.1.24.0/24 [110/2] via 10.1.46.4, 00:35:17, GigabitEthernet0/0
O 10.1.35.0/24 [110/2] via 10.1.56.5, 00:35:17, GigabitEthernet0/1
O 10.1.45.0/24 [110/2] via 10.1.56.5, 00:35:17, GigabitEthernet0/1
[110/2] via 10.1.46.4, 00:35:17, GigabitEthernet0/0
C 10.1.46.0/24 is directly connected, GigabitEthernet0/0
L 10.1.46.6/32 is directly connected, GigabitEthernet0/0
C 10.1.56.0/24 is directly connected, GigabitEthernet0/1
L 10.1.56.6/32 is directly connected, GigabitEthernet0/1
C 10.1.68.0/24 is directly connected, GigabitEthernet0/2
L 10.1.68.6/32 is directly connected, GigabitEthernet0/2RT7#sh ru ip route | b Gate
Gateway of last resort is 10.1.27.2 to network 0.0.0.0
S* 0.0.0.0/0 [1/0] via 10.1.27.2
7.0.0.0/32 is subnetted, 1 subnets
C 7.7.7.7 is directly connected, Loopback0
10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 10.1.27.0/24 is directly connected, GigabitEthernet0/0
L 10.1.27.7/32 is directly connected, GigabitEthernet0/0RT8#sh ip route | b Gate
Gateway of last resort is 10.1.68.6 to network 0.0.0.0
S* 0.0.0.0/0 [1/0] via 10.1.68.6
8.0.0.0/32 is subnetted, 1 subnets
C 8.8.8.8 is directly connected, Loopback0
10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 10.1.68.0/24 is directly connected, GigabitEthernet0/0
L 10.1.68.8/32 is directly connected, GigabitEthernet0/0※ちなみに、RT7やRT8から他のRTにping確認する場合は、souce loopback 0をつけてください。
５．まとめ
BGP Confederation構成のNWを構築し、BGPテーブルとルーティングテーブルをピックアップしてみました。
BGP Confederationの特徴は下記の通り。
・ピアリング数を減らすことができる
・BGP Confederation内部はiBGPで学習している
さて、これで終わりとしたいですが、まだ確認すべきことがあります。
外部ASから見たときは？
次回は、このテーマで検証をしていきたいと思います。
