EIGRP Over The Top

  1. NOTE
  2. VERIFICATION
  3. REFERENCE

NOTE

—EIGRP—[CE1]———(WAN, not EIGRP)——–[CE2]—EIGRP—

  • 分割されたEIGRPドメインを一つに扱える
    ⇒ CE1 は CE2 とEIGRPネイバーになれる
  • CEが多い時はBGPのようにルートリフレクタを使える（CEがRR機能を持てる）
  • RRはnext-hopやメトリックを変更することなくUpdateを反射できる

 

VERIFICATION

※ルータ間は10.x.5.0/24

  • 双方で同じ設定を実施
R1(config)#
R1(config)#do sh run | sec router eigrp
R1(config)#
R1(config)#router ei CCIE
R1(config-router)#add ipv4 uni auto 1
R1(config-router-af)#
R1(config-router-af)#nei 10.2.5.2 gi0/1 remote 2 lisp-encap 1
R1(config-router-af)#
*Jun 26 12:59:32.842: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 10.2.5.2 (GigabitEthernet0/1) is up: new adjacency
*Jun 26 12:59:33.789: %LINEPROTO-5-UPDOWN: Line protocol on Interface LISP1, changed state to up
R1(config-router-af)#
R1(config-router-af)#do sh ip ei nei
EIGRP-IPv4 VR(CCIE) Address-Family Neighbors for AS(1)
H   Address                 Interface              Hold Uptime   SRTT   RTO  Q  Seq
                                                   (sec)         (ms)       Cnt Num
0   10.2.5.2                Gi0/1                    14 00:00:24   11   100  0  6
R1(config-router-af)#
R1(config-router-af)#do sh run | sec router eigrp
router eigrp CCIE
 !
 address-family ipv4 unicast autonomous-system 1
  !
  topology base
  exit-af-topology
  neighbor 10.2.5.2 GigabitEthernet0/1 remote 2 lisp-encap 1 
  network 10.1.5.0 0.0.0.255  ★自動で追加
 exit-address-family
R1(config-router-af)#
R1(config-router-af)#
R1(config-router-af)#do sh ip ro ei | b Gate
Gateway of last resort is 10.1.5.5 to network 0.0.0.0

D     192.168.2.0/24 [90/93998811] via 10.2.5.2, 00:06:04, LISP1  ★対向からの経路
R1(config-router-af)#

 

  • R1をRoute Reflector にする。R2-R4の設定は上記と同じまま
R1(config)#router ei CCIE
R1(config-router)# add ipv4 uni auto 1
R1(config-router-af)#
R1(config-router-af)#remote-neighbors source gi0/1 unicast-listen lisp-encap 1
R1(config-router-af)#
*Jun 26 13:33:04.124: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 10.4.5.4 (GigabitEthernet0/1) is up: new adjacency
*Jun 26 13:33:04.557: %LINEPROTO-5-UPDOWN: Line protocol on Interface LISP1, changed state to up
R1(config-router-af)#
*Jun 26 13:33:05.920: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 10.3.5.3 (GigabitEthernet0/1) is up: new adjacency
R1(config-router-af)#
*Jun 26 13:33:08.158: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 10.2.5.2 (GigabitEthernet0/1) is up: new adjacency
R1(config-router-af)#af-int gi0/1
R1(config-router-af-interface)#no split
R1(config-router-af-interface)#
*Jun 26 13:33:50.306: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 10.2.5.2 (GigabitEthernet0/1) is resync: split horizon changed
*Jun 26 13:33:50.306: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 10.3.5.3 (GigabitEthernet0/1) is resync: split horizon changed
*Jun 26 13:33:50.306: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 10.4.5.4 (GigabitEthernet0/1) is resync: split horizon changed
R1(config-router-af-interface)#no next
R1(config-router-af-interface)#
*Jun 26 13:33:54.127: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 10.2.5.2 (GigabitEthernet0/1) is down: next_hop_self value changed
*Jun 26 13:33:54.128: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 10.3.5.3 (GigabitEthernet0/1) is down: next_hop_self value changed
*Jun 26 13:33:54.129: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 10.4.5.4 (GigabitEthernet0/1) is down: next_hop_self value changed
*Jun 26 13:33:54.979: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 10.2.5.2 (GigabitEthernet0/1) is up: new adjacency
*Jun 26 13:33:55.446: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 10.4.5.4 (GigabitEthernet0/1) is up: new adjacency
*Jun 26 13:33:57.472: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 10.3.5.3 (GigabitEthernet0/1) is up: new adjacency

 

R2#sh ip ro ei | b Gate
Gateway of last resort is 10.2.5.5 to network 0.0.0.0

D     192.168.3.0/24 [90/93998811] via 10.3.5.3, 00:09:49, LISP1
D     192.168.4.0/24 [90/93998811] via 10.4.5.4, 00:09:51, LISP1
R2#

R3#sh ip ro ei | b Gate
Gateway of last resort is 10.3.5.5 to network 0.0.0.0

D     192.168.2.0/24 [90/93998811] via 10.2.5.2, 00:09:56, LISP1
D     192.168.4.0/24 [90/93998811] via 10.4.5.4, 00:09:56, LISP1
R3#

R4#sh ip ro ei | b Gate
Gateway of last resort is 10.4.5.5 to network 0.0.0.0

D     192.168.2.0/24 [90/93998811] via 10.2.5.2, 00:10:02, LISP1
D     192.168.3.0/24 [90/93998811] via 10.3.5.3, 00:10:00, LISP1
R4#

 

REFERENCE

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