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These are the user uploaded subtitles that are being translated: 1 00:00:01,210 --> 00:00:04,510 In the section we're going to talk about h is R P protocol 2 00:00:07,060 --> 00:00:09,510 a first up redundancy protocol. 3 00:00:09,570 --> 00:00:16,050 F H R P is a computer networking protocol which is designed to predict the default gateway used on a 4 00:00:16,050 --> 00:00:22,740 summer work by allowing two or more others to provide backup for the address in the event of a failure 5 00:00:22,740 --> 00:00:30,000 of an active rather the backup brother will take over the address usually within a few seconds. 6 00:00:30,060 --> 00:00:37,410 In practice such protocols can also be used to protect other services operating on a single IP address 7 00:00:37,620 --> 00:00:39,480 not just Rather's 8 00:00:42,830 --> 00:00:49,910 hot standby rather protocol HSR AP is a running protocol that allows host computers on the Internet 9 00:00:49,910 --> 00:00:56,570 to use multiple roles that act as a single virtual rather maintaining the connectivity even if the first 10 00:00:56,570 --> 00:01:03,780 hop rather fails because other others are on standby and they're ready to go. 11 00:01:03,830 --> 00:01:12,520 Rachel IP and MAC addresses are shared between the two brothers and there is no load balancing and verified 12 00:01:12,650 --> 00:01:19,370 by the show stand by comment as you can see that in our figure we have two brothers and their rather 13 00:01:19,370 --> 00:01:33,810 one and rather two and please pay attention that I am using SRP to protect the default gateway for here 14 00:01:34,290 --> 00:01:39,400 and here if there is a problem in the brothers. 15 00:01:39,470 --> 00:01:45,680 This interface or if that rather fails completely. 16 00:01:45,760 --> 00:01:54,010 For example we can have an power problem or we can have a cable problem in the end interface connecting 17 00:01:54,010 --> 00:02:04,640 between switch and the rather if this rather is the active one the HSR IP protocol will switch the traffic 18 00:02:04,640 --> 00:02:06,960 to the standby rather. 19 00:02:07,910 --> 00:02:13,520 This is actually what HSR is doing but there is no load balancing. 20 00:02:13,520 --> 00:02:21,840 As I said for example if this one is the active rather rather one is the active further the traffic 21 00:02:21,840 --> 00:02:29,840 flows in that direction and there is no packet in here. 22 00:02:30,240 --> 00:02:36,990 When this guy fails the traffic is switched to this direction. 23 00:02:40,270 --> 00:02:44,200 And if I configure preemption on rather one 24 00:02:50,080 --> 00:02:57,580 for example let's say that I have fixed the power unit problem and if I configured preemption as well 25 00:02:58,150 --> 00:03:01,350 this rather will become the active Gateway again. 26 00:03:01,360 --> 00:03:04,920 And this guy will act as a standby 27 00:03:07,410 --> 00:03:15,280 so let's take a look how we select the active and the standby gateways in the HSR pit. 28 00:03:15,840 --> 00:03:23,310 As you can see that in the figure we have two others again and the rather with the highest IP address 29 00:03:23,310 --> 00:03:25,380 will be active by default. 30 00:03:25,530 --> 00:03:33,480 But the selection can be changed with the H S IP priority value the rather with the highest HSR P prior 31 00:03:33,480 --> 00:03:41,760 to Wally becomes active and default prior to value is one hundred the active and the standby rather 32 00:03:41,760 --> 00:03:47,670 send the help packets to the H SRP group multicast others in three seconds. 33 00:03:47,670 --> 00:03:54,890 If the hell a packet does not arrive in 10 seconds the standby rather becomes active. 34 00:03:54,960 --> 00:04:07,960 Okay let's say that this guy is active again and this guy is standby if I want to change the roles if 35 00:04:07,960 --> 00:04:23,740 I want to make this guy as an active I need to increase the price to only off this rather when I increase 36 00:04:23,740 --> 00:04:36,460 the prior to early this guy will be active and traffic will flow in this direction instead of this direction 37 00:04:37,240 --> 00:04:49,390 in HSR PD the active Gateway propagates this Michael risks and says that hey guys use this mac address 38 00:04:51,200 --> 00:05:03,550 Widget X X is the HSR p group identifier to reach the this IP address which is H S IP standby IP 39 00:05:06,650 --> 00:05:15,920 let's talk about the topology now we have a P.C. in here which has an IP address of 10 that more hundreds 40 00:05:17,470 --> 00:05:21,070 the gateway address of the P.C. is turned up 1. 41 00:05:21,100 --> 00:05:33,980 And please pay attention that that's the HSR P IP so I'm at I'm gonna attach this IP address to this 42 00:05:33,980 --> 00:05:41,720 interface of the rather one and I'm going to attach this IP address to this interface of rather too 43 00:05:42,050 --> 00:05:49,630 and I'm going to attach a standby IP for both of them and that's gonna be turned up 1. 44 00:05:49,760 --> 00:05:54,520 And I'm going to define the gateway as ten that one. 45 00:05:54,590 --> 00:06:01,930 So what do the thing about this for example why I'm not attaching the tender to as Gateway let's say 46 00:06:01,930 --> 00:06:12,950 that the gateways tend up to if the gate they will be turned up to I would follow this line to send 47 00:06:12,950 --> 00:06:23,090 the packets to wider network read but when this rather fails if this if there's a problem with the structure 48 00:06:23,090 --> 00:06:23,960 in the network 49 00:06:26,610 --> 00:06:28,950 because of the 10 that too will fail. 50 00:06:28,980 --> 00:06:39,810 Also I wouldn't go to why they're in network but if I configure this one whenever this rather fails 51 00:06:41,400 --> 00:06:51,590 rather to will be the active rather and take the traffic onto it and I'm going to reach the wider network 52 00:06:52,580 --> 00:06:55,600 again without any interruption. 53 00:06:55,630 --> 00:06:59,010 Let's take a look to the HSR preemption feature. 54 00:06:59,200 --> 00:07:06,400 If the active rather fails the standby rather is activated and it remains active even if the previous 55 00:07:06,610 --> 00:07:09,210 active Raptor is returned. 56 00:07:09,310 --> 00:07:14,760 Pre-emption process forces rather to a new age SRP selection 57 00:07:17,710 --> 00:07:20,790 and here are the states of the HSR brothers. 58 00:07:20,800 --> 00:07:25,880 We have six six states and the first state is initial. 59 00:07:25,960 --> 00:07:27,640 This is the beginning state. 60 00:07:27,700 --> 00:07:30,150 It indicates HSR SRP is not running. 61 00:07:30,160 --> 00:07:37,030 It happens when the configuration changed or the interface is first turned on in the lone state through 62 00:07:37,050 --> 00:07:38,250 other has not detriment. 63 00:07:38,290 --> 00:07:45,310 The virtual IP address and has not yet seen an authenticated hallow message from the active rather in 64 00:07:45,310 --> 00:07:53,470 the state the rather will still wait to hear from the active rather in the lizard state through other 65 00:07:53,470 --> 00:08:02,020 nodes both IP and make addresses of the virtual runner but it's not the active or standby in this big 66 00:08:02,020 --> 00:08:02,840 state. 67 00:08:02,870 --> 00:08:10,630 The rather sends periodic H.S. IP hellos and participates in the selection of active or standby rather 68 00:08:11,860 --> 00:08:18,640 in the standby state through other monitors how the packets from the active rather and it will take 69 00:08:18,640 --> 00:08:26,740 the active state when the current active rather fails and in the active state rather forward packets 70 00:08:26,740 --> 00:08:30,250 that are sent to the H IP group. 71 00:08:30,410 --> 00:08:30,930 The. 72 00:08:30,950 --> 00:08:34,030 Also sends periodic Hello message 73 00:08:36,930 --> 00:08:47,160 and here is the configuration of the HSR IP first I it to fix the IP addresses for my configuration 74 00:08:48,060 --> 00:08:50,580 the IPL this in here is 75 00:08:53,500 --> 00:09:02,620 turn it up to and here is 30 that three and my gateway s 76 00:09:06,400 --> 00:09:10,890 third it up 1 and my HSR IP is also 77 00:09:14,650 --> 00:09:23,550 what I do in the configuration as I'm going under the interface mode and I'm assigning the IP addresses 78 00:09:25,630 --> 00:09:40,650 at thirty two and 30 that 3 to the physical interfaces these are for here and for here then I'm going 79 00:09:40,650 --> 00:09:44,960 to attach the stand by IP by using standby. 80 00:09:46,260 --> 00:09:54,890 And standby group no and IP and the IP address okay. 81 00:09:55,050 --> 00:10:06,590 And then the same thing on rather two to I just have two different configurations for either one in 82 00:10:06,590 --> 00:10:12,220 here sent by one prior to one hundred and fifty. 83 00:10:12,230 --> 00:10:23,540 This line shows me that rather one is the active rather for this HSR P topology because of the default 84 00:10:23,570 --> 00:10:30,600 loli of the project is 100 if I choose the one hundred and fifty. 85 00:10:30,820 --> 00:10:39,510 This guy will be the active one and here as you can see that I types them by 1 pre-empt comment. 86 00:10:41,060 --> 00:10:45,710 Which means I have configured the pre-emption. 87 00:10:45,710 --> 00:10:48,860 For example if this rather fails 88 00:10:51,860 --> 00:11:02,350 this guy will be the active front but when this rather is back this guy will be standby again and rather 89 00:11:02,350 --> 00:11:12,440 one will be active because I configure the pre-emption to verify DHS IP configuration. 90 00:11:12,490 --> 00:11:21,500 I'm using the show standby command and I can see the group no state active virtual mac address and standby 91 00:11:21,550 --> 00:11:31,140 Rather's IP as well by typing this show standby by command I can use different gateways for different 92 00:11:31,140 --> 00:11:38,040 villains in HSR P2 and this is what multi Group H SRP is doing for me. 93 00:11:39,330 --> 00:11:54,350 For example for villain Sim and realign 20 I'm using this guy as primary and I'm using this guy as the 94 00:11:54,440 --> 00:11:58,300 secondary for villain to an end villain 10. 95 00:11:58,850 --> 00:12:08,650 Then I'm getting under the interface villain for example interface villain 10 I'm attaching a lower 96 00:12:08,650 --> 00:12:17,890 priority for v lantern and higher priority for villain 20 which means this is gonna be active for villain 97 00:12:18,160 --> 00:12:23,380 to any and this is gonna be in Sam by mode for the villain. 98 00:12:23,560 --> 00:12:23,890 10 99 00:12:28,490 --> 00:12:36,060 SRP has another great feature that is known as HSR interface tracking. 100 00:12:36,680 --> 00:12:45,580 As I told you in the first slide HSR P always is responsible for protecting the default gateway these 101 00:12:45,580 --> 00:12:58,690 interfaces but when I try to connect to Internet I have also this interfaces as well. 102 00:12:59,070 --> 00:13:11,670 So what HSR P is doing with interface tracking HSR P is watching that if this interface is up or not 103 00:13:13,500 --> 00:13:16,550 is the interface fails for example. 104 00:13:16,620 --> 00:13:27,090 If serial 0 0 interface fails well the HSR is doing. 105 00:13:28,450 --> 00:13:37,230 This is Dick demanding the private label for either one and rather B is becoming the active brother. 106 00:13:37,260 --> 00:13:44,710 So I'm not having an interruption so traffic is flowing in this direction 107 00:13:49,460 --> 00:13:54,120 so another thing that SRP can do is object tracking. 108 00:13:54,200 --> 00:14:03,890 For example let's say that I have no problem in this in this interface to and everything is OK in my 109 00:14:03,890 --> 00:14:05,330 local area network. 110 00:14:05,360 --> 00:14:07,220 Here is my local area network. 111 00:14:07,280 --> 00:14:14,950 My brother is working fine and mostly there is no problem in this interface or this interface. 112 00:14:14,960 --> 00:14:20,300 Everything is OK but there may be a problem on the 113 00:14:24,120 --> 00:14:34,820 ISP network maybe I have our central rudder in here that I am collecting to traffic from the branch 114 00:14:34,820 --> 00:14:40,240 offices but HAARP object tracking does. 115 00:14:40,380 --> 00:14:51,250 I can ping here this interface of my HQ rather and if pink fails to the HQ rather 116 00:14:54,490 --> 00:15:03,640 I can change the traffic's pattern again and maybe I can use another ISP and another central rather 117 00:15:03,730 --> 00:15:12,330 and so that my traffic won't interrupt here's the object traffic configuration as well. 118 00:15:13,950 --> 00:15:25,160 I'm defending an IP solely and I'm trying to pin this IP address as you can see that I have a local 119 00:15:25,160 --> 00:15:29,590 area network switch and I rather went and a rather two and on the other side. 120 00:15:29,600 --> 00:15:34,990 I have a core rather which has an IP address of somewhat 121 00:15:38,610 --> 00:15:48,520 then I'm defining it for a frequency which means that I'm gonna ping here each 5 seconds then I'm defining 122 00:15:48,970 --> 00:15:52,910 the study of the finished time of the HSR. 123 00:15:53,260 --> 00:15:58,870 I'm sorry IP silly then I'm tracking this IP SLA 124 00:16:02,890 --> 00:16:07,710 at the end whenever there is a problem I'm going to Dickerman. 125 00:16:09,090 --> 00:16:14,820 The pride truly and the other rather will switch as a active 126 00:16:19,730 --> 00:16:27,920 HS IP pro as the following two types of authentication and their plaintext and they and the five. 127 00:16:27,920 --> 00:16:34,850 If you want to configure and the five you can use the standby group authentication and the five key 128 00:16:34,850 --> 00:16:43,060 string and the key string number and this strength the group number is arbitrary you can choose anything 129 00:16:43,070 --> 00:16:51,620 that you up if you want to configure it plaintext you can use them by for example 1 authentication and 130 00:16:51,710 --> 00:17:01,410 you can use the string that you want all rather is in a HSR pick group send help packets by default 131 00:17:01,470 --> 00:17:06,770 the helo timer is set to 3 seconds and that timer is set to 10 seconds. 132 00:17:06,930 --> 00:17:13,650 It means that a helo packet is sent between the HSR please stand by group devices every two seconds 133 00:17:13,980 --> 00:17:20,760 and the stand by the W becomes active in a helo packet has not been set for 10 seconds. 134 00:17:20,850 --> 00:17:29,820 If you want to modify the helo and hold on time you can use standby standby group number timers and 135 00:17:29,910 --> 00:17:35,260 helo time or hold time command. 136 00:17:35,320 --> 00:17:41,200 There are two versions of the H SRP and their version one and the version to version 1 is the default 137 00:17:41,200 --> 00:17:49,900 version of the protocol H is IP version 2 allows group numbers of up to 4000 and 9 is 6 thus allowing 138 00:17:49,900 --> 00:17:53,170 you to use villain number as the group number. 139 00:17:53,260 --> 00:17:59,200 Although as in an HSR IP group must have the same version configured otherwise dialup messages are not 140 00:17:59,510 --> 00:18:00,290 unders to. 15835

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