dynamipsで試してみたけど普通に等コストロードバランシングできてる
グローバルで "no ip cef" 、インタフェースに no ip route-cache でだめか？

*Dec 22 00:47:24.003: IP: tableid=0, s=10.0.1.1 (Serial1/1), d=10.0.2.1 (Loopback0), routed via RIB
*Dec 22 00:47:24.007: IP: s=10.0.1.1 (Serial1/1), d=10.0.2.1, len 100, rcvd 4
*Dec 22 00:47:24.011: IP: tableid=0, s=10.0.2.1 (local), d=10.0.1.1 (Serial1/0), routed via RIB
*Dec 22 00:47:24.011: IP: s=10.0.2.1 (local), d=10.0.1.1 (Serial1/0), len 100, sending
*Dec 22 00:47:24.039: IP: tableid=0, s=10.0.1.1 (Serial1/0), d=10.0.2.1 (Loopback0), routed via RIB
*Dec 22 00:47:24.039: IP: s=10.0.1.1 (Serial1/0), d=10.0.2.1, len 100, rcvd 4
*Dec 22 00:47:24.039: IP: tableid=0, s=10.0.2.1 (local), d=10.0.1.1 (Serial1/1), routed via RIB
*Dec 22 00:47:24.039: IP: s=10.0.2.1 (local), d=10.0.1.1 (Serial1/1), len 100, sending
*Dec 22 00:47:24.047: IP: tableid=0, s=10.0.1.1 (Serial1/1), d=10.0.2.1 (Loopback0), routed via RIB
*Dec 22 00:47:24.047: IP: s=10.0.1.1 (Serial1/1), d=10.0.2.1, len 100, rcvd 4
*Dec 22 00:47:24.047: IP: tableid=0, s=10.0.2.1 (local), d=10.0.1.1 (Serial1/0), routed via RIB
*Dec 22 00:47:24.047: IP: s=10.0.2.1 (local), d=10.0.1.1 (Serial1/0), len 100, sending
*Dec 22 00:47:24.055: IP: tableid=0, s=10.0.1.1 (Serial1/0), d=10.0.2.1 (Loopback0), routed via RIB
*Dec 22 00:47:24.055: IP: s=10.0.1.1 (Serial1/0), d=10.0.2.1, len 100, rcvd 4
*Dec 22 00:47:24.055: IP: tableid=0, s=10.0.2.1 (local), d=10.0.1.1 (Serial1/1), routed via RIB
*Dec 22 00:47:24.055: IP: s=10.0.2.1 (local), d=10.0.1.1 (Serial1/1), len 100, sending