Juniper IP monitor(RPM)
本文已Juniper防火墙为例,介绍IP monitoring。
Juniper的IP monitor类似于思科的SLA ,华为的NQA , Juniper使用到的工具叫做real-time performance monitoring (RPM) ,当你看到RPM这个单词的时候不要陌生。RPM可以用在很多路由相关的地方,比如静态,比如动态路由等等。详细内容如下。
1.这个RPM有很多的探测功能如下
The device sends out the following probe types:
HTTP GET request at a target URL
HTTP GET request for metadata at a target URL
ICMP echo request to a target address (the default)
ICMP timestamp request to a target address
UDP ping packets to a target device
UDP timestamp requests to a target address
TCP ping packets to a target device
我们以常用的PING举例,看下如下的图片,内网接入了四家运营商,那么如何使用RPM去做运营商线路的监控与切换呢?
2.Juniper SRX的接口配置
root@SRX-Firewall# show interfaces | display set set interfaces ge-0/0/0 unit 0 family inet address 2.1.1.1/30 set interfaces ge-0/0/1 unit 1 family inet address 2.1.1.5/30 set interfaces ge-0/0/2 unit 2 family inet address 2.1.1.9/30 set interfaces ge-0/0/4 unit 80 family inet address 80.10.126.1/24
3.实现的目标是,当ISP1线路down ,ISP2链路接管; ISP1与ISP2链路down , ISP3接管,以此类推,具体的RPM配置如下
set services rpm probe Failover1 test probe-ge1 probe-type icmp-ping set services rpm probe Failover1 test probe-ge1 target address 2.1.1.2<<<< Monitoring 1 address set services rpm probe Failover1 test probe-ge1 probe-count 5 set services rpm probe Failover1 test probe-ge1 probe-interval 1 set services rpm probe Failover1 test probe-ge1 test-interval 5 set services rpm probe Failover1 test probe-ge1 thresholds total-loss 3 set services rpm probe Failover1 test probe-ge1 next-hop 2.1.1.2set services rpm probe Failover2 test probe2-ge1 probe-type icmp-ping set services rpm probe Failover2 test probe2-ge1 target address 2.1.1.2 <<<< 1st address in probe2 set services rpm probe Failover2 test probe2-ge1 probe-count 5 set services rpm probe Failover2 test probe2-ge1 probe-interval 1 set services rpm probe Failover2 test probe2-ge1 test-interval 5 set services rpm probe Failover2 test probe2-ge1 thresholds total-loss 3 set services rpm probe Failover2 test probe2-ge1 next-hop 2.1.1.2 set services rpm probe Failover2 test probe2-ge2 probe-type icmp-ping set services rpm probe Failover2 test probe2-ge2 target address 2.1.1.6<<<< 2nd address in probe2 set services rpm probe Failover2 test probe2-ge2 probe-count 5 set services rpm probe Failover2 test probe2-ge2 probe-interval 1 set services rpm probe Failover2 test probe2-ge2 test-interval 5 set services rpm probe Failover2 test probe2-ge2 thresholds total-loss 3 set services rpm probe Failover2 test probe2-ge2 next-hop 2.1.1.6set services rpm probe Failover3 test probe3-ge1 probe-type icmp-ping set services rpm probe Failover3 test probe3-ge1 target address 2.1.1.2<<<< 1st address in probe3 set services rpm probe Failover3 test probe3-ge1 probe-count 5 set services rpm probe Failover3 test probe3-ge1 probe-interval 1 set services rpm probe Failover3 test probe3-ge1 test-interval 5 set services rpm probe Failover3 test probe3-ge1 thresholds total-loss 3 set services rpm probe Failover3 test probe3-ge1 next-hop 2.1.1.2 set services rpm probe Failover3 test probe3-ge2 probe-type icmp-ping set services rpm probe Failover3 test probe3-ge2 target address 2.1.1.6<<<< 2nd address in probe3 set services rpm probe Failover3 test probe3-ge2 probe-count 5 set services rpm probe Failover3 test probe3-ge2 probe-interval 1 set services rpm probe Failover3 test probe3-ge2 test-interval 5 set services rpm probe Failover3 test probe3-ge2 thresholds total-loss 3 set services rpm probe Failover3 test probe3-ge2 next-hop 2.1.1.6 set services rpm probe Failover3 test probe3-ge3 probe-type icmp-ping set services rpm probe Failover3 test probe3-ge3 target address 2.1.1.10<<<< 3rd address in probe3 set services rpm probe Failover3 test probe3-ge3 probe-count 5 set services rpm probe Failover3 test probe3-ge3 probe-interval 1 set services rpm probe Failover3 test probe3-ge3 test-interval 5 set services rpm probe Failover3 test probe3-ge3 thresholds total-loss 3 set services rpm probe Failover3 test probe3-ge3 next-hop 2.1.1.10
4.接下来调用监控策略 ,如果ISP1链路down了,就走ISP2的链路,我们看下ip-monitoring的状态就很清晰了。
set services ip-monitoring policy GE1 match rpm-probe Failover1 set services ip-monitoring policy GE1 then preferred-route route 0.0.0.0/0 next-hop 2.1.1.6 set services ip-monitoring policy GE1 then preferred-route route 0.0.0.0/0 preferred-metric 4 set services ip-monitoring policy GE1_2 match rpm-probe Failover2 set services ip-monitoring policy GE1_2 then preferred-route route 0.0.0.0/0 next-hop 2.1.1.10 set services ip-monitoring policy GE1_2 then preferred-route route 0.0.0.0/0 preferred-metric 3 set services ip-monitoring policy GE1_2_3 match rpm-probe Failover3 set services ip-monitoring policy GE1_2_3 then preferred-route route 0.0.0.0/0 next-hop 80.10.126.254 set services ip-monitoring policy GE1_2_3 then preferred-route route 0.0.0.0/0 preferred-metric 2
---------------------All ISPs are up-----------------------------------
[edit] root@SRX-Firewall# run show services ip-monitoring status #这里解释一下,当步骤3的failover1探测正常时,那么路由的下一跳是走2.1.1.2; 当failover1探测失败后,那么会匹配步骤4的策略,下一跳走2.1.1.6,以此类推。 Policy - GE1 (Status: PASS)RPM Probes:Probe name Test Name Address Status---------------------- --------------- ---------------- ---------Failover1 probe-ge1 2.1.1.2 PASSRoute-Action:route-instance route next-hop state----------------- ----------------- ---------------- -------------inet.0 0.0.0.0/0 2.1.1.6 NOT-APPLIEDPolicy - GE1_2 (Status: PASS)RPM Probes:Probe name Test Name Address Status---------------------- --------------- ---------------- ---------Failover2 probe2-ge1 2.1.1.2 PASSFailover2 probe2-ge2 2.1.1.6 PASSRoute-Action:route-instance route next-hop state----------------- ----------------- ---------------- -------------inet.0 0.0.0.0/0 2.1.1.10 NOT-APPLIEDPolicy - GE1_2_3 (Status: PASS)RPM Probes:Probe name Test Name Address Status---------------------- --------------- ---------------- ---------Failover3 probe3-ge1 2.1.1.2 PASSFailover3 probe3-ge2 2.1.1.6 PASSFailover3 probe3-ge3 2.1.1.10 PASSRoute-Action:route-instance route next-hop state----------------- ----------------- ---------------- -------------inet.0 0.0.0.0/0 80.10.126.254 NOT-APPLIED[edit] root@SRX-Firewall# run show route 0.0.0.0inet.0: 28 destinations, 28 routes (28 active, 0 holddown, 0 hidden) + = Active Route, - = Last Active, * = Both0.0.0.0/0 *[Static/5] 08:57:12> to 2.1.1.2 via ge-0/0/0.0
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