等成本，多下跳静态路由不平衡

Question

我是负载平衡流量的双重，相同大小的链接聚合到相同的VRF在PE路由器(Juniper MX5 JunOS 11.4)。来自CE (Cisco)的流量是很好的平衡，但我需要得到相反的权利。

我不是NATing内的多站点网络，唯一的NATing发生在边缘防火墙到互联网。

我在Juniper PE路由器上配置了如下VRF：

# show routing-instances {client}
instance-type vrf;
.
.
vrf-export {client}-load-balance;
.
.
routing-options {
    static {
        .
        .
        route 10.0.0.0/24 next-hop [ 196.33.144.11 196.33.144.3 ];
        .
        .
    }
}
forwarding-options {
    load-balance {
        indexed-next-hop;
        per-flow {
            hash-seed;
        }
    }
}

在主要配置中：

# show policy-options policy-statement {client}-load-balance
then {
     load-balance per-packet;
}

和

# show forwarding-options hash-key
family inet {
    layer-3;
    layer-4;
}

路由器仍然只选择196.33.144.3跳来路由子网的(10.0.0.0/24)流量，而不是在两个链路上保持平衡。

以下是一些支票：

# run show route forwarding-table table {client}
Routing table: {client}.inet
Internet:
Destination        Type RtRef Next hop           Type Index NhRef Netif
default            user     0 8:5b:e:84:4c:b0    ucst   561     3 ge-1/1/2.3017
default            perm     0                    rjct   961     1
0.0.0.0/32         perm     0                    dscd   959     1
10.0.0.0/24        user     0 196.33.144.3       ucst   589     5 ge-1/1/5.2100
10.0.0.55/32       user     0                    ucst   645     6 gr-1/1/10.1
10.0.0.210/32      user     0                    ucst   645     6 gr-1/1/10.1
10.0.6.0/24        user     0                    ucst   921     3 gr-1/1/10.16
.
.

和

# run show route 10.0.0.0 table {client}.inet.0

{client}.inet.0: 19 destinations, 20 routes (19 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

10.0.0.0/24        *[Static/5] 3d 07:43:36
                    > to 196.33.144.3 via ge-1/1/5.2100
                      to 196.33.144.11 via gr-1/1/10.1

和

# run show route table {client}.inet.0 detail

{client}.inet.0: 19 destinations, 20 routes (19 active, 0 holddown, 0 hidden)
.
.
10.0.0.0/24 (1 entry, 1 announced)
        *Static Preference: 5
                Next hop type: Router, Next hop index: 1048574
                Address: 0xb6b407c
                Next-hop reference count: 3
                Next hop: 196.33.144.3 via ge-1/1/5.2100, selected
                Next hop: 196.33.144.11 via gr-1/1/10.1
                State: <Active Int Ext>
                Age: 3d 7:46:23
                Task: RT
                Announcement bits (2): 0-RT 2-KRT
                AS path: I
                AS path: Recorded

10.0.0.55/32 (1 entry, 1 announced)
        *Static Preference: 5
.
.

有使用路由器的默认inet.0实例来解释这一点的指南，但是我找不到在VRF中这样做的例子。

我尝试使用VRF导出命令作为“禁止表导出负载平衡策略名称”的替代方法，因为VRF没有转发表选项。

有什么我可以尝试的吗？

Answer 1

您似乎正在将负载平衡策略应用于routing-instance。它需要应用于forwarding-table，以便在转发平面上执行ECMP。

routing-options {
     forwarding-table {
          export load-balancing-policy;
     }
}

要确认它是有效的，您应该看到类似的东西。请注意转发表中的附加条目，以便输入10.0.0.0/24。

# run show route forwarding-table table {client}
Routing table: {client}.inet
Internet:
Destination        Type RtRef Next hop           Type Index NhRef Netif
default            user     0 8:5b:e:84:4c:b0    ucst   561     3 ge-1/1/2.3017
default            perm     0                    rjct   961     1
0.0.0.0/32         perm     0                    dscd   959     1
10.0.0.0/24        user     0 196.33.144.3       ucst   589     5 ge-1/1/5.2100 *
10.0.0.0/24        user     0 196.33.144.11      ucst   645     6 gr-1/1/10.1   *
10.0.0.55/32       user     0                    ucst   645     6 gr-1/1/10.1
10.0.0.210/32      user     0                    ucst   645     6 gr-1/1/10.1
10.0.6.0/24        user     0                    ucst   921     3 gr-1/1/10.16
.
.