日期：2015-06-28 00:00:00 来源: IT猫扑网
想必大家对路由器负载均衡功能都不会陌生，那么我们可以通过对路由器的转发表进行设置，从而达到流量负载均衡的目的。那么让我们一起来看看具体的路径配置内容吧。
缺省状态下,转发表中只安装路由表里的最佳路径
lab@juniper#run show route 6.6.6.6
1.inet.0:19 destinations,22 routes(19 active,0 holddown,0 hidden)
2.+=Active Route,-=Last Active,*=Both
3.
4.6.6.6.6/32*[IS-IS/18]00:03:33,metric 42
5.to 10.0.0.2 via fxp1.1
6.>to 10.0.1.2 via fxp1.2
7.
8.[edit]
9.lab@juniper#run show route forwarding-table
10.5.5.5.5/32 user 0 10.0.1.2 ucst 490 7 fxp1.2
11.6.6.6.6/32 user 0 10.0.1.2 ucst 490 7 fxp1.2
12.10.0.0.0/30 intf 0 rslv 459 1 fxp1.1
现在进行配置将路由表里的所有路径都安装进转发表
13.lab@juniper#show routing-options
14.forwarding-table {
15.export load-balance-route;
16.}
17.
18.lab@juniper#show policy-options
19.
20.policy-statement load-balance-route {
21.then {
22.load-balance per-packet;
23.}
24.}
查看路由表,路由器选择10.0.1.2作为最佳路由
25.lab@juniper#run show route 6.6.6.6
26.
27.inet.0:19 destinations,22 routes(19 active,0 holddown,0 hidden)
28.+=Active Route,-=Last Active,*=Both
29.
30.6.6.6.6/32*[IS-IS/18]00:03:33,metric 42
31.to 10.0.0.2 via fxp1.1
32.>to 10.0.1.2 via fxp1.2
转发表里对其所有前缀安装了多条路径
(注:安装的条目和PFE有关,IP-ASIC最多安装8条等价路径,以每个包为单位进行流量负载均衡，IP-II-ASIC最多安装16条,以每个流为单位进行流量负载均衡)
1.lab@juniper#run show route forwarding-table
2.1.1.1.1/32 intf 0 1.1.1.1 locl 468 1
3.2.2.2.2/32 user 0 ulst 489 11
4.10.0.0.2 ucst 497 2 fxp1.1
5.10.0.1.2 ucst 490 2 fxp1.2
6.3.3.3.3/32 user 0 ulst 489 11
7.10.0.0.2 ucst 497 2 fxp1.1
8.10.0.1.2 ucst 490 2 fxp1.2
9.4.4.4.4/32 user 0 ulst 489 11
10.10.0.0.2 ucst 497 2 fxp1.1
11.10.0.1.2 ucst 490 2 fxp1.2
12.5.5.5.5/32 user 0 ulst 489 11
13.10.0.0.2 ucst 497 2 fxp1.1
14.10.0.1.2 ucst 490 2 fxp1.2
15.6.6.6.6/32 user 0 ulst 489 11
16.10.0.0.2 ucst 497 2 fxp1.1
17.10.0.1.2 ucst 490 2 fxp1.2
18.10.0.0.0/30 intf 0 rslv 459 1 fxp1.1
配置路由器,只对特定前缀的多条路径安装进转发表,6.0.0.0/8,4.0.0.0/8,2.0.0.0/8
19.[edit]
20.lab@juniper#show policy-options policy-statement load-balance-route
21.from {
22.route-filter 6.0.0.0/8 orlonger;
23.route-filter 2.0.0.0/8 orlonger;
24.route-filter 4.0.0.0/8 orlonger;
25.}
26.then {
27.load-balance per-packet;
28.}
29.lab@juniper#show routing-options
30.forwarding-table {
31.export load-balance-route;
32.}
#p#副标题#e#
观察转发表,只对其特定前缀安装了多条路径,6.0.0.0/8,4.0.0.0/8,2.0.0.0/8
33.lab@juniper#run show route forwarding-table
34.1.1.1.1/32 intf 0 1.1.1.1 locl 468 1
35.2.2.2.2/32 user 0 ulst 489 3
36.10.0.0.2 ucst 497 6 fxp1.1
37.10.0.1.2 ucst 490 6 fxp1.2
38.3.3.3.3/32 user 0 10.0.1.2 ucst 490 6 fxp1.2
39.4.4.4.4/32 user 0 ulst 489 3
40.10.0.0.2 ucst 497 6 fxp1.1
41.10.0.1.2 ucst 490 6 fxp1.2
42.5.5.5.5/32 user 0 10.0.1.2 ucst 490 6 fxp1.2
43.6.6.6.6/32 user 0 ulst 489 3
44.10.0.0.2 ucst 497 6 fxp1.1
45.10.0.1.2 ucst 490 6 fxp1.2
46.10.0.0.0/30 intf 0 rslv 459 1 fxp1.1
47.10.0.0.0/32 dest 0 10.0.0.0 recv 457 1 fxp1.1
对5.5.5.5进行traceroute,每次都使用相同的下一跳
1.lab@juniper>traceroute 5.5.5.5
2.traceroute to 5.5.5.5(5.5.5.5),30 hops max,40 byte packets
3.1 10.0.1.2(10.0.1.2)0.457 ms 0.774 ms 0.224 ms
4.2 10.0.2.2(10.0.2.2)0.317 ms 0.360 ms 0.287 ms
5.3 10.0.3.2(10.0.3.2)0.398 ms 0.439 ms 0.383 ms
6.4 5.5.5.5(5.5.5.5)0.495 ms 0.533 ms 1.149 ms
7.
8.lab@juniper>traceroute 5.5.5.5
9.traceroute to 5.5.5.5(5.5.5.5),30 hops max,40 byte packets
10.1 10.0.1.2(10.0.1.2)0.431 ms 0.380 ms 0.225 ms
11.2 10.0.2.2(10.0.2.2)0.320 ms 0.367 ms 0.310 ms
12.3 10.0.3.2(10.0.3.2)0.402 ms 0.438 ms 0.392 ms
13.4 5.5.5.5(5.5.5.5)0.495 ms 0.546 ms 0.491 ms
14.
15.lab@juniper>traceroute 5.5.5.5
16.traceroute to 5.5.5.5(5.5.5.5),30 hops max,40 byte packets
17.1 10.0.1.2(10.0.1.2)0.427 ms 0.381 ms 0.220 ms
18.2 10.0.2.2(10.0.2.2)0.315 ms 0.362 ms 0.305 ms
19.3 10.0.3.2(10.0.3.2)0.401 ms 0.431 ms 0.383 ms
20.4 5.5.5.5(5.5.5.5)0.492 ms 0.529 ms 0.479 ms
21.
22.lab@juniper>
对6.6.6.6进行traceroute,每次都使用不同的下一跳
23.lab@juniper>traceroute 6.6.6.6
24.traceroute to 6.6.6.6(6.6.6.6),30 hops max,40 byte packets
25.1 10.0.1.2(10.0.1.2)0.427 ms 0.375 ms 10.0.0.2(10.0.0.2)0.224 ms
26.2 10.0.2.2(10.0.2.2)0.364 ms 0.349 ms 0.292 ms
27.3 10.0.3.2(10.0.3.2)0.385 ms 0.433 ms 0.386 ms
28.4 10.0.5.2(10.0.5.2)0.467 ms 0.518 ms 0.462 ms
29.5 6.6.6.6(6.6.6.6)0.572 ms 0.622 ms 0.567 ms
30.
31.lab@juniper>traceroute 6.6.6.6
32.traceroute to 6.6.6.6(6.6.6.6),30 hops max,40 byte packets
33.1 10.0.0.2(10.0.0.2)0.436 ms 10.0.1.2(10.0.1.2)0.382 ms 0.355 ms
34.2 10.0.2.2(10.0.2.2)0.316 ms 0.372 ms 0.315 ms
35.3 10.0.3.2(10.0.3.2)0.394 ms 0.443 ms 0.391 ms
36.4 10.0.5.2(10.0.5.2)0.473 ms 0.519 ms 0.465 ms
37.5 6.6.6.6(6.6.6.6)0.572 ms 0.610 ms 0.586 ms
38.
39.lab@juniper#run traceroute 6.6.6.6
40.traceroute to 6.6.6.6(6.6.6.6),30 hops max,40 byte packets
41.1 10.0.1.2(10.0.1.2)7.488 ms 0.511 ms 10.0.0.2(10.0.0.2)0.243 ms
42.2 10.0.2.2(10.0.2.2)0.367 ms 0.351 ms 0.299 ms
43.3 10.0.3.2(10.0.3.2)0.404 ms 0.435 ms 0.384 ms
44.4 10.0.5.2(10.0.5.2)0.478 ms 0.542 ms 0.470 ms
45.5 6.6.6.6(6.6.6.6)0.589 ms 0.615 ms 0.572 ms
46.
47.[edit logical-routers]
48.lab@juniper#run traceroute 6.6.6.6
49.traceroute to 6.6.6.6(6.6.6.6),30 hops max,40 byte packets
50.1 10.0.0.2(10.0.0.2)0.429 ms 10.0.1.2(10.0.1.2)0.388 ms 0.363 ms
51.2 10.0.2.2(10.0.2.2)0.322 ms 0.361 ms 0.304 ms
52.3 10.0.3.2(10.0.3.2)0.393 ms 0.452 ms 0.387 ms
53.4 10.0.5.2(10.0.5.2)0.471 ms 0.522 ms 0.471 ms
54.5 6.6.6.6(6.6.6.6)0.594 ms 0.632 ms 0.571 ms
基本上转发表流量负载均衡的所有路径配置就完成了。
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