Title: Inter VLAN routing
1Inter VLAN routing
2What is inter VLAN routing
3Traditional Inter VLAN Routing (1)
4Traditional Inter VLAN Routing (2)
5Traditional Inter VLAN Routing (3)
6Traditional Inter VLAN Routing (4)
7Traditional Inter VLAN Routing (5)
8Traditional Inter VLAN Routing (6)
9Traditional Inter VLAN Routing (7)
10Traditional Inter VLAN Routing (8)
11Router on a stick Inter VLAN Routing (1)
12Router on a stick Inter VLAN Routing (2)
13Router on a stick Inter VLAN Routing (3)
14Router 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.
15Router 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.
16Router on a stick Inter VLAN Routing (6)
17Router on a stick Inter VLAN Routing (7)
18Switch Layer 3 inter VLAN routing (1)
19Switch Layer 3 inter VLAN routing (2)
20Switch Layer 3 inter VLAN routing (3)
21Switch Layer 3 inter VLAN routing (4)
22Traditional 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..
23Traditional 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.
24Traditional 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.
25Traditional 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.
26Traditional 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.
27Traditional Vs Router-on-stick (6)
28Configuring Traditional Inter VLAN routing (1)
29Configuring Traditional Inter VLAN routing (2)
Switch configuration
30Configuring Traditional Inter VLAN routing (3)
Router configuration
31Configuring Traditional Inter VLAN routing (4)
32Configure router-on-a-stick inter VLAN routing (1)
33Configure router-on-a-stick inter VLAN routing (2)
34Configure router-on-a-stick inter VLAN routing (3)
35Troubleshooting inter VLAN routing switch
issues (1)
Incorrect VLAN
36Troubleshooting inter VLAN routing switch
issues (2)
Not configure as a trunk
37Troubleshooting inter VLAN routing switch
issues (3)
No Redundant link
38Troubleshooting inter VLAN routing router
issues
Incorrect VLAN on a stick
39Troubleshooting inter VLAN routing IP
addressing issues (1)
Incorrect IP Addressing
40Troubleshooting inter VLAN routing IP
addressing issues (2)
Incorrect subnet mask