How do you troubleshoot inter VLAN routing?
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How do you troubleshoot inter VLAN routing?
To correct this problem, physically connect the router R1 interface G0/0 to switch S1 port F0/4. This puts the router interface in the correct VLAN and allows inter-VLAN routing. Alternately, change the VLAN assignment of switch port F0/9 to VLAN 10. This also allows PC1 to communicate with router R1 interface G0/0.
What could cause an inter VLAN connectivity issue?
An inter-VLAN connectivity issue could be caused by a missing VLAN. The VLAN could be missing if it was not created, it was accidently deleted, or it is not allowed on the trunk link.
Which are three options for inter VLAN routing?
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- Legacy inter-VLAN routing.
- Router-on-a-stick.
- Layer 3 switch using Switched Virtual Interface (SVI)
What are the common issues in VLAN?
Table 3-9 Common Problems with Trunks
| Problem | Result |
|---|---|
| Native VLAN mismatch | Poses a security risk and creates unintended results |
| Trunk mode mismatch | Causes loss of network connectivity |
| Allowed VLANs on trunks | Causes unexpected traffic or no traffic to be sent over the trunk |
How do I ping from one VLAN to another?
Use a extended ping command by using the source address from an SVI interface you’ve created towards the IP address of the another SVI on this switch. Once these interfaces are up, and you have setup the IP addresses on the hosts belonging to them, you are able to see the ARP table for each L3 interface (SVI).
What are the steps which must be completed in order to enable inter-VLAN routing using router-on-a-stick?
What are the steps that must be completed in order to enable inter-VLAN routing using router-on-a-stick? Configure the physical interfaces on the router and enable a routing protocol. Create the VLANs on the router and define the port membership assignments on the switch.
Can L2 switch do inter-VLAN routing?
Devices in the same VLAN can communicate without any routing, and devices in different VLANs require routing to communicate with each other. L2 switches require an L3 routing device to communicate between different VLANs, and the device is either an external router or Layer 3 module on the same chassis.
What are the two common methods used for inter VLAN routing?
There are three inter-VLAN routing options:
- Legacy Inter-VLAN routing: This is a legacy solution.
- Router-on-a-Stick: This is an acceptable solution for a small- to medium-sized network.
- Layer 3 switch using switched virtual interfaces (SVIs): This is the most scalable solution for medium to large organizations.
What are the steps that must be completed in order to enable inter VLAN routing using router-on-a-stick?
What are VLAN troubleshooting commands?
VLAN Troubleshooting Commands
- show vlan. When devices are not communicating with each other while supposedly configured on the same VLAN, the first command you should run on the switch is show vlan.
- show interfaces vlan (#)
- show interfaces trunk.
How do I test a VLAN?
Stacked Virtual LAN (VLAN) Testing Features
- Test the capability of the switch to handle the MAC frames at various bandwidths.
- Test the forwarding capacity of the switch (based on the MAC addresses)
- Measure the ability of the switch to deliver the frames in sequence.
How do I enable inter VLAN communication?
Router on a Stick Create two sub-interfaces on the router and tell it to which VLAN they belong. Don’t forget to add an IP address for each VLAN. The router will be able to route because these two networks are directly connected. Don’t forget to set your IP address and gateway on the computers.
How do you troubleshoot a Layer 2 loop?
1) Eliminate Layer 1 issue using “show ip interface “command. 2) Verify VLAN exist on the Switch using “Show VLAN “command. 3) Verify that the interface is assigned to the correct VLAN using “show interface switchport” command. 4) Verify that VLAN is allowed on trunk port using “show interface trunk” command.
What are the layers of troubleshooting?
The 7 Layer OSI Model of IT Troubleshooting
- Application Layer.
- Presentation Layer (Operation System)
- Session Layer.
- Transport Layer.
- Network Layer.
- Data Link Layer.
- Physical Layer.
How do you get VLANs to talk to each other?
There are three methods of permitting traffic to flow between VLANs:
- Configure a router and connect a single interface to a switch per VLAN configured.
- Configure a router to use IEEE 802.1Q and connect to a switch via a trunk.
- Configure (and possibly purchase) a Layer 3–capable switch.
What is inter-VLAN routing?
In this type of inter-VLAN routing, a router is usually connected to the switch using multiple interfaces. One for each VLAN. The interfaces on the router are configured as the default gateways for the VLANs configured on the switch.
How do I troubleshoot network connectivity issues?
Examine the network and locate the source of any connectivity issues. – Test connectivity and use the necessary show commands on to verify configurations. – List all of the problems and possible solutions in the Documentation Table. Make changes according to your recommended solutions. Verify the PCs can ping other PCs and R1.
How does a switch forward a packet to a different VLAN?
When the router receives the packet, it examines the packet’s destination IP address and forwards it to the correct network using the access port for the destination VLAN. The switch now can forward the frame to the destination node since the router changed the VLAN information from the source VLAN to the destination VLAN.
What is the difference between VLANs and switches?
When we learnt about VLANs, we said that each VLAN is usually on its own subnet, switches mainly operate at layer 2 of the OSI model and therefore they do not examine the logical addresses. Therefore, user nodes located on different VLANs cannot communicate by default.
