实验要求：R1的环回到R6的环回必须走R3, R5，来回路径一致。并且R2,R4为冗余备份路径。
结果
R1#traceroute 10.100.6.6
Type escape sequence to abort.
Tracing the route to 10.100.6.6
VRF info: (vrf in name/id, vrf out name/id)
1 13.1.1.3 1 msec 1 msec 2 msec
2 35.1.1.5 2 msec 2 msec 1 msec
3 56.1.1.6 1 msec 3 msec
R6#traceroute 10.100.1.1
Type escape sequence to abort.
Tracing the route to 10.100.1.1
VRF info: (vrf in name/id, vrf out name/id)
1 56.1.1.5 1 msec 0 msec 0 msec
2 35.1.1.3 2 msec 2 msec 0 msec
3 13.1.1.1 8 msec 1 msec
配置
R2#show run | s eigrp
router eigrp 1
network 10.0.0.0
network 12.0.0.0
network 24.0.0.0
offset-list 1 out 921600 Ethernet0/1
R2#show access-lists
Standard IP access list 1
10 permit 10.100.0.0, wildcard bits 0.0.255.255 (37 matches)
R4#show run | s eigrp
router eigrp 1
network 10.0.0.0
network 24.0.0.0
network 34.0.0.0
network 46.0.0.0
network 47.0.0.0
offset-list 1 out 921600 Ethernet0/2
offset-list 1 out 921600 Ethernet0/1
offset-list 1 in 921600 Ethernet0/1
offset-list 1 in 921600 Ethernet0/2
R4#show access-lists
Standard IP access list 1
10 permit 10.100.0.0, wildcard bits 0.0.255.255 (82 matches)
R6#show run | s eigrp
router eigrp 1
network 10.0.0.0
network 46.0.0.0
network 56.0.0.0
network 67.0.0.0
offset-list 1 out 921600
R6#show acc
R6#show access-l
R6#show access-lists
Standard IP access list 1
10 permit 10.100.0.0, wildcard bits 0.0.255.255 (34 matches)EIGRP选路
原文：http://blog.51cto.com/13625527/2091695
