Jul 23, 2011 · On Layer 2, devices can communicate within a single network only. Layer 2 devices cannot span multiple networks, for multiple networks Layer 3 support is required. Each device in a single network needs to be identified uniquely. At Layer 2, unique identification is done via physical addressing scheme.

Jan 4, 2012 · layer 2 = STP, UDLD, CDP, LLDP, ARP, VTP etc. which are all protocols not routed outside a given subnet. layer 3 = BGP, OSPF, EIGRP, IS-IS, IP etc.

Data Link Layer is basically divided into two sub-layers: • Logic Link Control (LLC): Provide services to upper layer. • Media Access Control (MAC): Perform Layer 2 functions like switching, physical addressing etc. Basically what I am going to explain in this article is, how inter-communication happens in data network between two devices ...

Aug 31, 2013 · Introduction This document will explain you initial layer 2 troubleshooting steps with some helpful IOS command. Finding degraded performance across link Approaching Steps: Check for physical interface problems like duplex mismatch. By default, each Cisco Switch port uses Ethernet auto-negoti...

Jul 19, 2016 · You have to be aware that the Term "Layer 2 switch" only means that the forwarding of packets is done based on L2 information (this is the data-plane). Nothing more! In addition to that there can be many features that look at …

Jul 16, 2009 · interface GigabitEthernet1/2/3. bandwidth 200000. ip address x.x.x.x 255.255.255.252. ip flow ingress. ip flow egress. logging event link-status. load-interval 30. no negotiation auto. cdp enable. service-policy output XXXXXX. end. We have a shaping policy applied to the interface as follows: GigabitEthernet1/2/3. Service-policy output: XXXXXXX

Nov 14, 2012 · A Layer 2 switched campus network carries traffic for this VLAN throughout the network. All devices in a VLAN are members of the same broadcast domain. If an end device transmits a Layer 2 broadcast, all other members of the VLAN receive the broadcast. This solution not so scalable. I would not recommend it for large campus size network.

Jan 6, 2013 · Hello Kashish, In fact, OSPF neighbors form their adjacency over Layer3 connectivity within a single Layer2 domain.

Aug 8, 2017 · Good question. Interestingly, they do not. Similar to my previous posts - after adding the "speed 1000" device to the ports - the result is Layer 2 "down/down". Here is the output of my show commands on both devices: Sw1#sh ip int bri. GigabitEthernet1/0/1 unassigned YES unset up up GigabitEthernet1/0/2 unassigned YES unset administratively ...

Mar 19, 2009 · Yeah this is an old post! lol Off the top of my head I would say IP addressing is at layer 3. So the DHCP leasing needs to be at the same layer with either a SVI or routed port on the switch. Remember any device looking for a DHCP lease needs to know where to get it.