#Ospfv2 with router on a stick how to#
#Ospfv2 with router on a stick mac#

! Second option: like normal, but add the native keywordД¬onfiguring Routing to VLANs Using a Layer 3 Switch ! First option: put the native VLAN IP address on the Configure the ip addresscommand on a subinterface, and use the encapsulationвЂ¦native subcommand.Configure the ip addresscommand on the physical interface, but without an encapsulation command the router considers this physical interface to be using the native VLAN.While not required, most sites do choose to make the subinterface number match the VLAN ID.Д®ach 802.1Q trunk has one native VLAN, and when used, the configuration to use that native VLAN differs, with two options for the router side of the configuration: ! No IP address up here! No encapsulation up here!Д¬odes: L вЂ“ local, C вЂ“ connected, S вЂ“ static, R вЂ“ RIP, M вЂ“ mobile, B вЂ“ BGPДЎ0.0.0.0/8 is variably subnetted, 4 subnets, 2 masksД¬ 10.1.10.0/24 is directly connected, GigabitEthernet0/0.10 Configure IP settings (address and mask) in subinterface config mode (ip address address mask). Enable 802.1Q, and associate one specific VLAN with the subinterface in subinterface config mode (encapsulation dot1q vlan_id). Create a unique subinterface for each VLAN that needs to be routed (interface type

#Ospfv2 with router on a stick how to#

How to configure 802.1Q trunking on a router: That trunking configurationДЄdditionally, note that Cisco routers do not attempt to negotiate trunking, so both the router and switch need to manually configure trunking. To each VLAN, and therefore each subnet that sits on a separate VLAN. ROAS uses router VLAN trunking configuration to give the router a logical router interface connected

That long description can be a bit of a chore to repeat each time someone wants to discuss this feature, so over time, the networking world has instead settled on a shorter and more interesting name for this feature: Router on a Stick (ROAS). How to route packets to subnets associated with VLANs connected to a Use a router, with a VLAN trunk connecting to a LAN switch.Use a router, with one router LAN interface and cable connected to the switch for each and every VLAN (typically not used).However, the first option requires too many interfaces and links, and is only mentioned to make the list complete: Three options exist for connecting a router to each subnet on a VLAN. Transmit the frame out the outgoing interface, as listed in the matched IP route.Д¬omparisons of Packet Switching, Fast Switching, and CEF

#Ospfv2 with router on a stick mac#

When forwarding out LAN interfaces, use ARP as needed to find the next deviceвЂ™s MAC address.ДҐ. Encapsulate the packet into a data link frame appropriate for the outgoing interface. This route identifies the outgoing interface of the router and possibly the next-hop router.Д¤. To do so, compare the packetвЂ™s destination IP address to the routing table and find the route that matches the destination address. If choosing to process the frame at Step 1, deencapsulate the packet from inside the data link frame.ДЈ. The frameвЂ™s destination data link address is the routerвЂ™s address (or an appropriate multicast or broadcast address).Дў. The frame has no errors (per the data link trailer Frame Check Sequence, or FCS, field)Д«. For each received data link frame, choose whether or not to process the frame. Routers have a little more routing work to do as compared with hosts.ДЎ. Use the already-known ARP table entry, or use ARP messages to learn the information.

If the destination is not local, send to the default gateway:ДЄ. Encapsulate the IP packet in a data link frame, with the destination data link address of Protocol (ARP) table entry, or use ARP messages to learn the information.Д«.

If the destination is local, send directly:ДЄ. In other words, IP routing delivers IP packets from the sending host to the destination host. IP routing-the process of forwarding IP packets-delivers packets across entire TCP/IP networks, from the device that originally builds the IP packet to the device that is supposed to receive the packet. For routers to do a good job of routing packets, routers need to have a detailed accurate list of IP routes. Each route also lists instructions that tell the router where to forward packets sent to addresses in that IP network or subnet. Each IP route lists a destination-an IP network, IP subnet, or some other group of IP addresses. That routing process relies on information called IP routes. For routers to route packets, routers follow a routing process. That simple statement actually carries a lot of hidden meaning.