Subinterfaces allow a router to scale to accommodate more VLANs than the physical interfaces permit.īecause there is no contention for bandwidth on physical interfaces, physical interfaces have better performance for inter-VLAN routing. On networks with many VLANs, using a single router to perform inter-VLAN routing is not possible. Physical interfaces are configured to have one interface per VLAN. These include the pros and caveats to the use of Inter-VLAN routing. Whereas Inter-VLAN routing might be a great approach to solving VLAN isolation, there is a considerable amount of points to be aware of. Serial0/1 unassigned YES unset administratively down down Serial0/0 unassigned YES unset administratively down downįastEthernet0/1 unassigned YES unset administratively down down
CISCO ROUTER ON A STICK CONFIGURATION MANUAL
Interface IP-Address OK? Method Status ProtocolįastEthernet0/0 unassigned YES unset administratively down downįastEthernet0/0.10 10.10.10.1 YES manual administratively down downįastEthernet0/0.20 10.10.20.1 YES manual administratively down downįastEthernet0/0.30 10.10.30.1 YES manual administratively down downįastEthernet0/0.40 10.10.40.1 YES manual administratively down down Verify configuration information for the subinterfaces See below Encapsulation 802.1Q Virtual LAN, Vlan ID 10. You realise that the subinterface has identified its associated VLAN as well as the encapsulation protocol used, in this case being an 802.1Q. Last clearing of "show interface" counters never Verify configuration to ensure it’s working – repeat for the other subinterfaces R1#show int fastEthernet 0/0.10įastEthernet0/0.10 is administratively down, line protocol is down Let’s start with VLAN’s 10 Subinterface configuration on R1 The subinterface ID is a logical number which describes the VLAN ID allowed on that interface. NOTE: the “.” Between the interface ID and the subinterface ID is a requirement. Step 4 > Configure Ethernet interface for the appropriate subinterfaces hostname(config)# interface physical_interface.subinterface for example hostname(config)# interface gigabitethernet0/1.100 Step 3 > Configue the respective VLANS on SW1 Step 2 > Enable interface FastEthernet on Router R1(config)# int fa0/0 Step 1 > Configure Trunk Interface FastEthernet0/0 on Switch SW1(config)# int fa0/1 Subinterfaces on interface configured on router for respective VLANSĮncapsulation dot1q 10 Įxpected configuration required on Switch Configure Trunk interface to the Router VLAN 10 = 10.10.10.0/24Ĭreate IP Addressing Scheme for each Subinterface on RouterĮxpected Configuration required on Router Well, the Network Guy says leave that with me and he performs Inter-VLAN Routing using Routing on a Stick per the steps below.Ĭreate an IP Addressing Scheme for each VLAN’s Subnet. Ruby then says, do something about this, I need to be able to print these documents by close of day so Caleb can have it shipped first thing in the morning. The Network guy says to Ruby, there seem to be a problem! The departments are not allowed to speak with each other. She then decides to get the IT guy to give her access to the Printer in the Marketing department. Suzy has just realised that the Publication Printer is in the Marketing Department and due to the sensitive nature of the document, she only wants to print the relevant pages and so cannot it to Caleb. Ruby works in the Production(VLAN 10) and needs Caleb who works in Marketing(VLAN 20) to pick up an important publication first thing on Tuesday morning. Logical because, with VLANS, a number of interfaces on the switch which represents the users end devices or host machines are grouped logically so they are independent and securely contained away from unexpected broadcasts(announcements). It is a simple defacto but not the best approach if you have departments and wants their dealings to be contained in their logical space. Traditionally, most small businesses have users connected via a Switch in one Broadcast Domain (see Figure 1.0 above) which enables all devices on the network to speak with each other.
0 kommentar(er)
