BROCADE IP PRIMER

Console49F Link 50F1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47Power1F 2F 3F 4F2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 4849F Link 50FPowerConsole1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 471F 2F 3F 4F2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 4849F Link 50FPowerConsole1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 471F 2F 3F 4F2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48Routing Basics10Welcome to the Layer 3 portion of the book. For the next five chapters, we'regoing to the Network Layer of Brocade's technologies. We will explore the flexibilityof the Layer 3 switch.To do so, we need to make sure that your switch is running Base Layer 3 or FullRouting code. Few, if any, of the commands listed in the next few chapters willhave any application if your switch is not running routing code. Review Chapter5 if you need to.Disabling Layer 2If we're going to use our Brocade switch as a router (or at least part of it), wemay find it wise to make that clear. Let's look at an example:Switch Ave 10172.16.0.1/24e1192.168.1.1/30e1192.168.1.2/30Switch Bve 20172.17.0.1/24e2192.168.2.2/30e1192.168.2.1/30Switch Cve 30172.18.0.1/24VLAN 10172.16.0.0/24VLAN 20172.17.0.0/24VLAN 30172.18.0.0/24Each switch is housing its own subnet. Each switch is housing its own broadcastdomain. In this example, each switch is playing the part of a switch to itslocally connected hosts. It's also playing the part of router to connect to theother switches. Switch A is connecting to Switch B. Each switch has one of twoaddresses in the 192.168.1.0/30 subnet. There are no other hosts in thatsubnet (nor can there be). The only reason that subnet exists is to route trafficbetween Switch A and Switch B. Likewise, the connection between Switch Band Switch C is set up the same way, but with the 192.168.2.0/30 subnet.The point is that, for the 192.168.1.0/30 and 192.168.2.0/30 subnets, weare not at all interested in playing the role of a switch (Layer 2). This functioncan be turned off, for just such an instance. This way, no Layer 2 information ispassed. It is as if the involved interfaces are actually routers.Brocade IP Primer 219