CCIE R/S Written Sample Question – Part 1 を解いてみる

問題

http://blog.internetworkexpert.com/2009/08/23/ccie-rs-written-sample-question-part-1/

各ルータの出力

R1#sh ip ro | b ^Gate

Gateway of last resort is not set

1.0.0.0/24 is subnetted, 1 subnets

C 1.1.1.0 is directly connected, Loopback0

10.0.0.0/24 is subnetted, 6 subnets

C 10.60.60.0 is directly connected, FastEthernet0/1

D 10.50.50.0 [90/307200] via 10.60.60.6, 00:45:25, FastEthernet0/1

D 10.40.40.0 [90/332800] via 10.60.60.6, 00:13:39, FastEthernet0/1

D 10.30.30.0 [90/332800] via 10.10.10.2, 00:13:39, FastEthernet0/0

D 10.20.20.0 [90/307200] via 10.10.10.2, 00:50:29, FastEthernet0/0

C 10.10.10.0 is directly connected, FastEthernet0/0

R2#sh ip ro | b ^Gate

Gateway of last resort is not set

1.0.0.0/24 is subnetted, 1 subnets

D EX 1.1.1.0 [170/2662400] via 10.20.20.3, 00:13:03, FastEthernet0/1

10.0.0.0/24 is subnetted, 6 subnets

D 10.60.60.0 [90/307200] via 10.10.10.1, 00:49:53, FastEthernet0/0

D 10.50.50.0 [90/332800] via 10.10.10.1, 00:13:03, FastEthernet0/0

D 10.40.40.0 [90/332800] via 10.20.20.3, 00:13:03, FastEthernet0/1

D 10.30.30.0 [90/307200] via 10.20.20.3, 00:18:55, FastEthernet0/1

C 10.20.20.0 is directly connected, FastEthernet0/1

C 10.10.10.0 is directly connected, FastEthernet0/0

R3#sh ip ro | b ^Gate

Gateway of last resort is not set

1.0.0.0/24 is subnetted, 1 subnets

D EX 1.1.1.0 [170/2636800] via 10.30.30.4, 00:18:38, FastEthernet0/0

10.0.0.0/24 is subnetted, 6 subnets

D 10.60.60.0 [90/332800] via 10.20.20.2, 00:18:38, FastEthernet0/1

D 10.50.50.0 [90/332800] via 10.30.30.4, 00:18:38, FastEthernet0/0

D 10.40.40.0 [90/307200] via 10.30.30.4, 00:20:04, FastEthernet0/0

C 10.30.30.0 is directly connected, FastEthernet0/0

C 10.20.20.0 is directly connected, FastEthernet0/1

D 10.10.10.0 [90/307200] via 10.20.20.2, 00:24:31, FastEthernet0/1

R4#sh ip ro | b ^Gate

Gateway of last resort is not set

1.0.0.0/24 is subnetted, 1 subnets

D EX 1.1.1.0 [170/2611200] via 10.40.40.5, 00:19:13, FastEthernet0/1

10.0.0.0/24 is subnetted, 6 subnets

D 10.60.60.0 [90/332800] via 10.40.40.5, 00:19:13, FastEthernet0/1

D 10.50.50.0 [90/307200] via 10.40.40.5, 00:19:13, FastEthernet0/1

C 10.40.40.0 is directly connected, FastEthernet0/1

C 10.30.30.0 is directly connected, FastEthernet0/0

D 10.20.20.0 [90/307200] via 10.30.30.3, 00:20:39, FastEthernet0/0

D 10.10.10.0 [90/332800] via 10.30.30.3, 00:19:13, FastEthernet0/0

R5#sh ip ro | b ^Gate

Gateway of last resort is not set

1.0.0.0/24 is subnetted, 1 subnets

D EX 1.1.1.0 [170/2585600] via 10.50.50.6, 00:19:33, FastEthernet0/0

10.0.0.0/24 is subnetted, 6 subnets

D 10.60.60.0 [90/307200] via 10.50.50.6, 00:19:33, FastEthernet0/0

C 10.50.50.0 is directly connected, FastEthernet0/0

C 10.40.40.0 is directly connected, FastEthernet0/1

D 10.30.30.0 [90/307200] via 10.40.40.4, 00:19:33, FastEthernet0/1

D 10.20.20.0 [90/332800] via 10.40.40.4, 00:19:33, FastEthernet0/1

D 10.10.10.0 [90/332800] via 10.50.50.6, 00:19:33, FastEthernet0/0

R6#sh ip ro | b ^Gate

Gateway of last resort is not set

1.0.0.0/24 is subnetted, 1 subnets

B 1.1.1.0 [20/0] via 10.60.60.1, 00:44:31

10.0.0.0/24 is subnetted, 6 subnets

C 10.60.60.0 is directly connected, FastEthernet0/1

C 10.50.50.0 is directly connected, FastEthernet0/0

D 10.40.40.0 [90/307200] via 10.50.50.5, 00:14:18, FastEthernet0/0

D 10.30.30.0 [90/332800] via 10.50.50.5, 00:14:18, FastEthernet0/0

D 10.20.20.0 [90/332800] via 10.60.60.1, 00:14:18, FastEthernet0/1

D 10.10.10.0 [90/307200] via 10.60.60.1, 00:46:05, FastEthernet0/1

ポイント

• AD 値を比較する: eBGP (20), Internal EIGRP (90), External EIGRP (170), iBGP (200)
• R1 は、1.1.1.0/24 を BGP でアドバタイズしている。
• R6 の BGP の neighbor の設定が正しいことをチェックする。