NOTE
- auto-summary は外部経路は集約しない
- 内部経路があれば外部経路も集約される
DIAGRAM
VERIFICATION
R1#sh ip int b | e una Interface IP-Address OK? Method Status Protocol FastEthernet1/0 192.168.12.1 YES manual up up R1#sh run | sec router eigrp router eigrp 65000 network 192.168.12.1 0.0.0.0 eigrp router-id 10.0.0.1 R2#sh ip int b | e una Interface IP-Address OK? Method Status Protocol FastEthernet0/0 192.168.12.2 YES manual up up FastEthernet1/0 192.168.23.2 YES manual up up R2#sh run | sec router eigrp router eigrp 65000 network 192.168.12.2 0.0.0.0 network 192.168.23.2 0.0.0.0 eigrp router-id 10.0.0.2 R2# R3#sh ip int b | e una Interface IP-Address OK? Method Status Protocol FastEthernet0/0 192.168.23.3 YES manual up up FastEthernet1/0 10.3.3.3 YES manual up up Loopback0 10.0.0.3 YES manual up up R3#sh run | sec router eigrp router eigrp 65000 network 192.168.23.3 0.0.0.0 auto-summary eigrp router-id 10.0.0.3 R3#
変更前
R2 ではEIGRP 経路は受信せず
R2#sh ip ro ei | b Gate Gateway of last resort is not set R2#
R3 でauto-summary
route-map でLoopback0 を再配送
R3(config)#route-map CON-INTO-EIGRP R3(config-route-map)#match int lo 0 R3(config-route-map)# R3(config-route-map)#router ei 65000 R3(config-router)#redist con route-map CON-INTO-EIGRP R3(config-router)#
auto-summary があっても、R3 には有効な内部経路が無いので集約はされない
R2#sh ip ro ei | b Gate
Gateway of last resort is not set
10.0.0.0/32 is subnetted, 1 subnets
D EX 10.0.0.3 [170/156160] via 192.168.23.3, 00:01:53, FastEthernet1/0
R2#
同時に外部経路と同じ10.台でEIGRP を有効にしてみる
R3(config)#route-map CON-INTO-EIGRP R3(config-route-map)#match int lo 0 R3(config-route-map)# R3(config-route-map)#router ei 65000 R3(config-router)#redist con route-map CON-INTO-EIGRP R3(config-router)#net 10.3.3.3 0.0.0.0 R3(config-router)#
集約経路のみになる
R2#sh ip ro ei | b Gate Gateway of last resort is not set D 10.0.0.0/8 [90/30720] via 192.168.23.3, 00:02:13, FastEthernet1/0 R2#
R2 でauto-summary
R3 はLoopback0 を再配送
R3#sh ip int b | e una Interface IP-Address OK? Method Status Protocol FastEthernet0/0 192.168.23.3 YES manual up up FastEthernet1/0 10.3.3.3 YES manual up up Loopback0 10.0.0.3 YES manual up up R3#sh run | sec router eigrp router eigrp 65000 network 192.168.23.3 0.0.0.0 redistribute connected route-map CON-INTO-EIGRP eigrp router-id 10.0.0.3 R3# R3#sh run | sec route-map CON-INTO-EIGRP permit 10 route-map CON-INTO-EIGRP permit 10 match interface Loopback0 R3#
R2 では外部経路で受信、R2 でauto-summary を設定
R2#sh ip ro ei | b Gate
Gateway of last resort is not set
10.0.0.0/32 is subnetted, 1 subnets
D EX 10.0.0.3 [170/156160] via 192.168.23.3, 00:03:58, FastEthernet1/0
R2#sh run | sec router eigrp
router eigrp 65000
network 192.168.12.2 0.0.0.0
network 192.168.23.2 0.0.0.0
eigrp router-id 10.0.0.2
R2#conf t
R2(config)#router eigrp 65000
R2(config-router)#auto-summary
R2(config-router)#
R1 では外部経路のまま
R1#sh ip ro ei | b Gate
Gateway of last resort is not set
10.0.0.0/32 is subnetted, 1 subnets
D EX 10.0.0.3 [170/158720] via 192.168.12.2, 00:11:17, FastEthernet1/0
D 192.168.23.0/24 [90/30720] via 192.168.12.2, 00:53:45, FastEthernet1/0
R1#
R2 で10.台をEIGRP で有効にする
R2(config-router)#int lo 0 R2(config-if)#ip add 10.0.0.2 255.255.255.255 R2(config-if)#router eigrp 65000 R2(config-router)#net 10.0.0.2 0.0.0.0 R2(config-router)#
R1 では集約経路で受信
R1#sh ip ro ei | b Gate Gateway of last resort is not set D 10.0.0.0/8 [90/156160] via 192.168.12.2, 00:01:23, FastEthernet1/0 D 192.168.23.0/24 [90/30720] via 192.168.12.2, 00:57:41, FastEthernet1/0 R1#
自身で再配送、ネイバーから受信のどちらであっても、内部経路が無い場合はauto-summary では外部経路の集約はできない
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