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Inter VLAN routing

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Inter VLAN routing W.lilakiatsakun Configure router-on-a-stick inter VLAN routing (3) Troubleshooting inter VLAN routing switch issues (1) Incorrect VLAN ... – PowerPoint PPT presentation

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Title: Inter VLAN routing


1
Inter VLAN routing
  • W.lilakiatsakun

2
What is inter VLAN routing
3
Traditional Inter VLAN Routing (1)
4
Traditional Inter VLAN Routing (2)
5
Traditional Inter VLAN Routing (3)
6
Traditional Inter VLAN Routing (4)
7
Traditional Inter VLAN Routing (5)
8
Traditional Inter VLAN Routing (6)
9
Traditional Inter VLAN Routing (7)
10
Traditional Inter VLAN Routing (8)
11
Router on a stick Inter VLAN Routing (1)
12
Router on a stick Inter VLAN Routing (2)
13
Router on a stick Inter VLAN Routing (3)
14
Router on a stick Inter VLAN Routing (4)
  • Router-on-a-stick is a type of router
    configuration in which a single physical
    interface routes traffic between multiple VLANs
    on a network.
  • The router interface is configured to operate as
    a trunk link and is connected to a switch port
    configured in trunk mode.
  • The router performs the inter-VLAN routing by
    accepting VLAN tagged traffic on the trunk
    interface coming from the adjacent switch and
    internally routing between the VLANs using
    subinterfaces.

15
Router on a stick Inter VLAN Routing (5)
  • Subinterfaces are multiple virtual interfaces,
    associated with one physical interface.
  • These subinterfaces are configured independently
    configured with an IP address and VLAN assignment
    to operate on a specific VLAN.

16
Router on a stick Inter VLAN Routing (6)
17
Router on a stick Inter VLAN Routing (7)
18
Switch Layer 3 inter VLAN routing (1)
19
Switch Layer 3 inter VLAN routing (2)
20
Switch Layer 3 inter VLAN routing (3)
21
Switch Layer 3 inter VLAN routing (4)
22
Traditional Vs Router-on-stick (1)
  • Port Limits
  • Physical interfaces are configured to have one
    interface per VLAN on the network.
  • On networks with many VLANs, using a single
    router to perform inter-VLAN routing is not
    possible.
  • Instead, you could use multiple routers to
    perform inter-VLAN routing for all VLANs if
    avoiding the use of subinterfaces is a priority.
  • Subinterfaces allow a router to scale to
    accommodate more VLANs than the physical
    interfaces permit..

23
Traditional Vs Router-on-stick (2)
  • Performance
  • Because there is no contention for bandwidth on
    separate physical interfaces, physical interfaces
    have better performance when compared to using
    subinterfaces.
  • When subinterfaces are used for inter-VLAN
    routing, the traffic being routed competes for
    bandwidth on the single physical interface.

24
Traditional Vs Router-on-stick (3)
  • Access Ports and Trunk Ports
  • Connecting physical interfaces for inter-VLAN
    routing requires that the switch ports be
    configured as access ports.
  • Subinterfaces require the switch port to be
    configured as a trunk port so that it can accept
    VLAN tagged traffic on the trunk link.

25
Traditional Vs Router-on-stick (4)
  • Cost
  • Financially, it is more cost-effective to use
    subinterfaces over separate physical interfaces.
  • Routers that have many physical interfaces cost
    more than routers with a single interface.
  • Switch ports are an expensive resource on high
    performance switches.

26
Traditional Vs Router-on-stick (5)
  • Complexity
  • Using subinterfaces for inter-VLAN routing
    results in a less complex physical configuration
    than using separate physical interfaces, because
    there are fewer physical network cables
    interconnecting the router to the switch.
  • On the other hand, using subinterfaces with a
    trunk port results in a more complex software
    configuration, which can be difficult to
    troubleshoot.

27
Traditional Vs Router-on-stick (6)
28
Configuring Traditional Inter VLAN routing (1)
29
Configuring Traditional Inter VLAN routing (2)
Switch configuration
30
Configuring Traditional Inter VLAN routing (3)
Router configuration
31
Configuring Traditional Inter VLAN routing (4)
32
Configure router-on-a-stick inter VLAN routing (1)
33
Configure router-on-a-stick inter VLAN routing (2)
34
Configure router-on-a-stick inter VLAN routing (3)
35
Troubleshooting inter VLAN routing switch
issues (1)
Incorrect VLAN
36
Troubleshooting inter VLAN routing switch
issues (2)
Not configure as a trunk
37
Troubleshooting inter VLAN routing switch
issues (3)
No Redundant link
38
Troubleshooting inter VLAN routing router
issues
Incorrect VLAN on a stick
39
Troubleshooting inter VLAN routing IP
addressing issues (1)
Incorrect IP Addressing
40
Troubleshooting inter VLAN routing IP
addressing issues (2)
Incorrect subnet mask
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